1
Download New Products Catalog
Transcript
August 2013
New Products Catalog
High Performance Analog ICs
LTC2057 High Voltage, Low Noise Zero-Drift Operational Amplifier
LTC3330 Nanopower Buck-Boost + DC/DC with Energy Harvesting
Battery Life Extender
LT4320 Ideal Diode Bridge Controller
LT3081 1.5A Single Resistor Rugged Linear Regulator with Monitors
LTM4637 20A DC/DC µModule Step-Down Regulator
LTC3774 Dual, Multiphase Current Mode Synchronous Controller
for Sub-Milliohm DCR Sensing
NEW!!!! Free Demo Boards Available!!!!
Visit www.arrownac.com/ltcnewproducts
to register for your free demo board, view data sheets,
purchase parts, or contact your local Arrow
sales representative at 800.833.3557.
www.arrownac.com/Itcnewproducts
Power Management
Arrow Vision Series >>
Power Management 2013
Coming to a city near you.
Rochester, 8/22
Baltimore, 8/29
Focused on one of today’s hottest topics — delivering exceptional
performance with ever-greater energy efficiency — this is your chance
to join the electronic industry’s foremost innovators in an exciting,
Seattle, 9/10
single-day power event.
Toronto, 9/26
The Power to Succeed
> Hone your expertise with hands-on technical classes
> Get inspired as industry experts discuss today’s hottest topics
Portland, 9/12
Chicago, 9/19*
San Jose, 10/3*
Minneapolis, 10/10*
Phoenix, 10/17
Boston, 10/24*
San Diego, 10/30
> Join the discussion during the “Power Expo”
Dallas, November 11/12
> Expand your network with peers, suppliers and industry experts
Orange County, 11/19
> Connect to the latest power solutions
Los Angeles, 11/21
Attend Linear Technology’s seminars! Register now at
www.arrownac.com/vision or contact your local Arrow
representative for more information.
*Arrowfest 2013 – Powered by Vision Series
arrow.com
Contents
Amplifiers
LTC2057/LTC2057HV High Voltage, Low Noise Zero-Drift Operational Amplifier .................................................................................................1
LT6015/LT6016/LT6017 3.2MHz, 0.8V/µs Low Power, Over-The-Top® Precision Op Amps .................................................................................2
Battery Management Systems
LTC6804-1/LTC6804-2 Multicell Battery Monitors ...............................................................................................................................................3
Data Converters
LTC2313-12 12-Bit, 2.5Msps Serial Sampling ADC in TSOT ................................................................................................................................4
LTC2313-14 14-Bit, 2.5Msps Serial Sampling ADC in TSOT ................................................................................................................................5
LTC2376-20 20-Bit, 250ksps, Low Power SAR ADC with 0.5ppm INL.................................................................................................................7
LTC2377-20 20-Bit, 500ksps, Low Power SAR ADC with 0.5ppm INL.................................................................................................................8
Energy Harvesting
LTC3330 Nanopower Buck-Boost + DC/DC with Energy Harvesting Battery Life Extender .................................................................................10
High Frequency
LTC5510 1MHz to 6GHz Wideband High Linearity Active Mixer .........................................................................................................................11
Hot Swap™ Controller
LTC4227 Dual Ideal Diode and Single Hot Swap Controller................................................................................................................................12
Ideal Diode Bridge
LT4320/LT4320-1 Ideal Diode Bridge Controller ................................................................................................................................................14
LDO Linear Regulators
LT3007 Series 3µA IQ, 20mA, 45V Low Dropout Fault Tolerant Linear Regulators .............................................................................................15
LT3055 500mA, Linear Regulator with Precision Current Limit and Diagnostics ...............................................................................................16
LT3081 1.5A Single Resistor Rugged Linear Regulator with Monitors...............................................................................................................17
LT3090 –36V, 600mA Negative Linear Regulator with Programmable Current Limit .........................................................................................18
LED Driver
LT3955 60VIN LED Converter with Internal PWM Generator ..............................................................................................................................19
µModule® Regulators
LTM4637 20A DC/DC µModule Step-Down Regulator .......................................................................................................................................20
LTM4649 10A Step-Down DC/DC µModule Regulator .......................................................................................................................................21
LTM8028 36VIN, UltraFast ™, Low Output Noise 5A µModule Regulator .............................................................................................................22
PMIC
LTC3676/LTC3676-1 Power Management Solution for Application Processor ...................................................................................................23
Contents
Power System Management
LTC2978A 8-Channel PMBus Power System Manager Featuring Accurate Output Voltage Measurement .........................................................24
Switching Regulators—Monolithic
LTC3374 8-Channel Parallelable 1A Buck DC/DCs .............................................................................................................................................25
LT3574 Isolated Flyback Converter without an Opto-Coupler.............................................................................................................................26
LTC3607 Dual 600mA 15V Monolithic Synchronous Step-Down DC/DC Regulator ...........................................................................................27
LTC3630A High Efficiency, 76V 500mA Synchronous Step-Down Converter .....................................................................................................28
LT3995 60V, 3A, 2MHz Step-Down Switching Regulator with 2.7µA Quiescent Current ....................................................................................29
LT8697 USB 5V 2.5A Output, 42V Input Synchronous Buck with Cable Drop Compensation ............................................................................30
Switching Regulators—Controller
LTC3774 Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing...................................................................32
Design Note
DN516 1µA IQ Synchronous Boost Converter Extends Battery Life in Portable Devices
L, Linear Express, Linear Technology, LT, LTC, LTM, Burst Mode, FilterCAD, LTspice, OPTI-LOOP, Over-The-Top, PolyPhase, SwitcherCAD, TimerBlox, µModule and the Linear logo are registered
trademarks of Linear Technology Corporation. Adaptive Power, Bat-Track, BodeCAD, C-Load, Direct Flux Limit, DirectSense, Easy Drive, EZSync, FilterView, Hot Swap, isoSPI, LDO+, Linduino, LinearView,
LTBiCMOS, LTCMOS, LTPoE++, LTpowerCAD, LTpowerPlanner, LTpowerPlay, Micropower SwitcherCAD, Multimode Dimming, No Latency ∆Σ, No Latency Delta-Sigma, No RSENSE, Operational Filter,
PanelProtect, PLLWizard, PowerPath, PowerSOT, PScope, QuikEval, RH DICE Inside, RH MILDICE Inside, SafeSlot, Silent Switcher, SmartStart, SNEAK-A-BIT, SoftSpan, Stage Shedding, Super Burst,
SWITCHER+, ThinSOT, Triple Mode, True Color PWM, UltraFast, Virtual Remote Sense, Virtual Remote Sensing, VLDO and VRS are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Amplifiers
LTC2057/LTC2057HV
High Voltage, Low Noise Zero-Drift
Operational Amplifier
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Supply Voltage Range
n
4.75V to 36V (LTC2057)
n
4.75V to 60V (LTC2057HV)
Offset Voltage: 4μV (Maximum)
Offset Voltage Drift: 0.015μV/°C (Maximum, –40°C to 125°C)
Input Noise Voltage
n
200nVP-P, DC to 10Hz (Typ)
n
11nV/√Hz, 1kHz (Typ)
Input Common Mode Range: V– – 0.1V to V+ – 1.5V
Rail-to-Rail Output
Unity Gain Stable
Gain Bandwidth Product: 1.5MHz (Typ)
Slew Rate: 0.45V/μs (Typ)
AVOL: 150dB (Typ)
PSRR: 160dB (Typ)
CMRR: 150dB (Typ)
Shutdown Mode
The LTC®2057 is a high voltage, low noise, zero-drift operational
amplifier that offers precision DC performance over a wide supply
range of 4.75V to 36V or 4.75V to 60V for the LTC2057HV. Offset
voltage and 1/f noise are suppressed, allowing this amplifier to
achieve a maximum offset voltage of 4μV and a DC to 10Hz input
noise voltage of 200nVP-P (typ). The LTC2057’s self-calibrating
circuitry results in low offset voltage drift with temperature,
0.015μV/°C (max), and zero-drift over time. The amplifier also
features an excellent power supply rejection ratio (PSRR) of 160dB
and a common mode rejection ratio (CMRR) of 150dB (typ).
APPLICATIONS
n
n
n
n
n
n
n
n
High Resolution Data Acquisition
Reference Buffering
Test and Measurement
Electronic Scales
Thermocouple Amplifiers
Strain Gauges
Low Side Current Sense
Automotive Monitors and Control
The LTC2057 provides rail-to-rail output swing and an input
common mode range that includes the V– rail (V– – 0.1V to V+ –
1.5V). In addition to low offset and noise, this amplifier features a
1.5MHz (typ) gain-bandwidth product and a 0.45V/μs (typ) slew rate.
Wide supply range, combined with low noise, low offset, and
excellent PSRR and CMRR make the LTC2057 and LTC2057HV
well suited for high dynamic-range test, measurement and
instrumentation systems.
Wide Input Range Precision Gain-of-100
Instrumentation Amplifier
30V
–IN
+
LTC2057HV
–
18V
–30V
TOP VIEW
232Ω
SD
1
–IN
2
+IN
3
V–
4
–
+
9
V–
7 V+
6 OUT
5 NC
TOP VIEW
SD
–IN
+IN
V–
1
2
3
4
–
+
30V
8
7
6
5
SDCOM
V+
OUT
NC
DD
DD PACKAGE
PACKAGE
8-LEAD (3mm
(3mm ×× 3mm)
3mm) PLASTIC
PLASTIC DFN
DFN
8-LEAD
MS8
MS8 PACKAGE
PACKAGE
8-LEAD PLASTIC
PLASTIC MSOP
MSOP
8-LEAD
LTC2057IDD
LTC2057HVIDD
LTC2057HDD
LTC2057HVHDD
LTC2057IMS8
LTC2057HVIMS8
LTC2057HMS8
LTC2057HVHMS8
–
+IN
+
–IN 2
+IN 3
–
+
V– 4
8
SDCOM
7
V+
6
OUT
5
NC
1
2
3
4
5
–
+
6
VOUT
2057 TA01a
INPUT CM RANGE = ±28V WITH 4V OF OUTPUT SWING
CMRR = 130dB (TYP), INPUT OFFSET VOLTAGE = 1µV (TYP)
–30V
Input Offset Voltage vs Supply Voltage
5
5 TYPICAL UNITS
4 VCM = VS /2
T = 25°C
3 A
TOP VIEW
GRD
–IN
+IN
GRD
V–
7
8
M9 V
CC
9
M3
10
M1 LT1991A
OUT
1
P1
REF
2
P3
VEE
5
3
P9
4
–18V
LTC2057HV
TOP VIEW
SD 1
11.5k
11.5k
8 SDCOM
2
10
9
8
7
6
S8 PACKAGE
8-LEAD
8-LEAD PLASTIC
PLASTIC SO
SO
MS PACKAGE
10-LEAD
10-LEAD PLASTIC
PLASTIC MSOP
MSOP
LTC2057IS8
LTC2057HVIS8
LTC2057HS8
LTC2057HVHS8
LTC2057IMS
LTC2057HVIMS
LTC2057HMS
LTC2057HVHMS
SD
SDCOM
V+
NC
OUT
VOS (µV)
n
1
0
–1
–2
–3
–4
–5
0 5 10 15 20 25 30 35 40 45 50 55 60 65
VS (V)
2057 TA01b
1
Amplifiers
LT6015/LT6016/LT6017
3.2MHz, 0.8V/µs Low Power, Over-The-Top
Precision Op Amps
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Input Common Mode Range: V– to V– + 76V
Rail-to-Rail Input and Output
Low Power: 315μA/Amplifier
Operating Temperature Range: –55°C to 150°C
VOS: ±50μV (Maximum)
CMRR, PSRR: 126dB
Reverse Battery Protection to 50V
Gain Bandwidth Product: 3.2MHz
Specified on 5V and ±15V Supplies
High Voltage Gain: 1000V/mV
No Phase Reversal
No Supply Sequencing Problems
Single 5-Lead SOT-23 (ThinSOT™) Package
Dual 8-Lead MSOP
Quad 22-Lead DFN (6mm × 3mm)
The LT®6015/LT6016/LT6017 are single/dual/quad rail-to-rail input
operational amplifiers with input offset voltage trimmed to less than
50µV. These amplifiers operate on single and split supplies with a
total voltage of 3V to 50V and draw only 315µA per amplifier. They
are reverse battery protected, drawing very little current for reverse
supplies up to 50V.
The Over-The-Top® input stage of the LT6015/LT6016/LT6017 is
designed to provide added protection in tough environments. The
input common mode range extends from V– to V+ and beyond: these
amplifiers operate with inputs up to 76V above V– independent of V+.
Internal resistors protect the inputs against transient faults up to 25V
below the negative supply. The LT6015/LT6016/LT6017 can drive
loads up to 25mA and are unity-gain stable with capacitive loads as
large as 200pF. Optional external compensation can be added to
extend the capacitive drive capability beyond 200pF.
The LT6015 is offered in a 5-lead SOT package. The LT6016 dual op
amp is available in an 8-lead MSOP package. The LT6017 is offered
in a 22-pin leadless DFN package.
APPLICATIONS
n
n
n
n
n
High Side or Low Side Current Sensing
Battery/Power Supply Monitoring
4mA to 20mA Transmitters
High Voltage Data Acquisition
Battery/Portable Instrumentation
Precision High Voltage High Side Load Current Monitor
TOP VIEW
TOP VIEW
OUTA
1
22 OUTD
–INA
2
21 –IND
+INA
3
N/C
4
19 N/C
V–
5
18 V +
N/C
6
A
D
23
20 +IND
7
16 V
N/C
8
15 N/C
+INB
9
–INB 10
B
1
2
3
4
C
OUTB 11
DJC
DJC PACKAGE
PACKAGE
22-LEAD (6mm
(6mm ×× 3mm)
3mm) PLASTIC
PLASTIC DFN
DFN
22-LEAD
LT6017IDJC
LT6017HDJC
LT6017MPDJC
5V
VBAT = 1.5V TO 76V
200Ω
0.1Ω
10W
200Ω
0.1µF
+
LT6015
100Ω
1%
–
1V/A
0V TO 1V OUT
LOAD
2k
TOP VIEW
Output Error vs Load Current
5 V+
OUT 1
0.2
V– 2
4 –IN
+IN 3
S5 PACKAGE
5-LEAD
5-LEAD PLASTIC
PLASTIC TSOT-23
TSOT-23
LT6015IS5
LT6015HS5
LT6015MPS5
0
–0.2
–0.4
–0.6
VBAT = 1.5V
VBAT = 5V
VBAT = 20V
VBAT = 75V
–0.8
–1.0
0.01
2
BSP89
601567 TA01a
14 +INC
12 OUTC
B
V+
OUTB
–INB
+INB
LT6016IMS8
LT6016HMS8
LT6016MPMS8
+
13 –INC
A
8
7
6
5
MS8 PACKAGE
8-LEAD
8-LEAD PLASTIC
PLASTIC MSOP
MSOP
17 N/C
–
V
OUTA
–INA
+INA
V–
OUTPUT ERROR (%)
n
0.1
LOAD CURRENT (A)
1
601567 TA01b
Battery Management Systems
LTC6804-1/LTC6804-2
Multicell Battery Monitors
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Measures Up to 12 Battery Cells in Series
Stackable Architecture Supports 100s of Cells
Built-In isoSPI™ Interface:
1Mbps Isolated Serial Communications
Uses a Single Twisted Pair, Up to 100 Meters
Low EMI Susceptibility and Emissions
1.2mV Maximum Total Measurement Error
290µs to Measure All Cells in a System
Synchronized Voltage and Current Measurement
16-Bit Delta-Sigma ADC with Frequency Programmable
3rd Order Noise Filter
Engineered for ISO26262 Compliant Systems
Passive Cell Balancing with Programmable Timer
5 General Purpose Digital I/O or Analog Inputs:
Temperature or other Sensor Inputs
Configurable as an I2C or SPI Master
4μA Sleep Mode Supply Current
48-Lead SSOP Package
The LTC®6804 is a 3rd generation multicell battery stack monitor
that measures up to 12 series connected battery cells with a total
measurement error of less than 1.2mV. The cell measurement
range of 0V to 5V makes the LTC6804 suitable for most battery
chemistries. All 12 cell voltages can be captured in 290µs, and lower
data acquisition rates can be selected for high noise reduction.
Multiple LTC6804 devices can be connected in series, permitting
simultaneous cell monitoring of long, high voltage battery strings.
Each LTC6804 has an isoSPI interface for high speed, RF-immune,
local area communications. Using the LTC6804-1, multiple
devices are connected in a daisy-chain with one host processor
connection for all devices. Using the LTC6804-2, multiple devices
are connected in parallel to the host processor, with each device
individually addressed.
Additional features include passive balancing for each cell, an
onboard 5V regulator, and 5 general purpose I/O lines. In sleep
mode, current consumption is reduced to 4µA. The LTC6804 can be
powered directly from the battery, or from an isolated supply.
APPLICATIONS
n
Total Measurement Error
vs Temperature of 5 Typical Units
2.0
1.5
TOP VIEW
TOP VIEW
V+
1
48 IPB
V+
1
48 A3
C12
2
47 IMB
C12
2
47 A2
S12
3
46 ICMP
S12
3
46 A1
C11
4
45 IBIAS
C11
4
45 A0
S11
5
44 SDO (NC)*
S11
5
44 SDO (IBIAS)*
C10
6
43 SDI (NC)*
C10
6
43 SDI (ICMP)*
S10
7
42 SCK (IPA)*
S10
7
42 SCK (IPA)*
C9
8
41 CSB (IMA)*
C9
8
41 CSB (IMA)*
S9
9
40 ISOMD
S9
9
40 ISOMD
C8 10
39 WDT
C8 10
39 WDT
S8 11
38 DRIVE
S8 11
38 DRIVE
C7 12
37 VREG
C7 12
37 VREG
S7 13
36 SWTEN
S7 13
36 SWTEN
C6 14
35 VREF1
C6 14
35 VREF1
S6 15
34 VREF2
S6 15
34 VREF2
C5 16
33 GPIO5
C5 16
33 GPIO5
S5 17
32 GPIO4
S5 17
32 GPIO4
C4 18
31 V–
C4 18
31 V–
S4 19
30 V–**
S4 19
30 V–**
C3 20
29 GPIO3
C3 20
29 GPIO3
S3 21
28 GPIO2
S3 21
28 GPIO2
C2 22
27 GPIO1
C2 22
27 GPIO1
S2 23
26 C0
S2 23
26 C0
C1 24
25 S1
C1 24
25 S1
G PACKAGE
48-LEAD PLASTIC SSOP
G PACKAGE
48-LEAD PLASTIC SSOP
G PACKAGE
48-LEAD PLASTIC SSOP
G PACKAGE
48-LEAD PLASTIC SSOP
LTC6804IG-1
LTC6804HG-1
LTC6804IG-2
LTC6804HG-2
+
12S1P
+
IPB
+
+
0.5
0
–0.5
–1.0
–2.0
–50 –25
IMB
ILP
IPA
75
50
25
TEMPERATURE (°C)
0
100
125
680412 TA01b
•
•
IPB
LTC6804-1
IMB
IPA
IMA
+
1.0
–1.5
LTC6804-1
IMA
+
CELL VOLTAGE = 3.3V
5 TYPICAL UNITS
•
•
IPB
MPU
LTC6804-1
IMB
IPA
SPI
•
•
n
Electric and Hybrid Electric Vehicles
Backup Battery Systems
Grid Energy Storage
High Power Portable Equipment
MEASUREMENT ERROR (mV)
n
•
•
n
IP
LTC6820
IMA
IM
680412 TA01a
3
Data Converters
LTC2313-12
12-Bit, 2.5Msps Serial Sampling ADC in TSOT
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
2.5Msps Throughput Rate
No Cycle Latency
Guaranteed 12-Bit No Missing Codes
Single 3V or 5V Supply
Low Noise: 73dB SNR
Low Power: 14mW at 2.5Msps and 3V Supply
Low Drift (20ppm/°C Maximum) 2.048V or 4.096V Internal
Reference
Sleep Mode with < 1µA Typical Supply Current
Nap Mode with Quick Wake-Up < 1 Conversion
Separate 1.8V to 5V Digital I/O Supply
High Speed SPI-Compatible Serial I/O
Guaranteed Operation from –40°C to 125°C
8-Lead TSOT-23 Package
The LTC®2313-12 is a 12-bit, 2.5Msps, serial sampling A/D
converter that draws only 5mA from a single 3V or 5V supply. The
LTC2313-12 contains an integrated low drift reference and reference
buffer providing a low cost, high performance (20ppm/°C maximum)
and space saving solution. The LTC2313-12 achieves outstanding
AC performance of 72.6dB SINAD and –84dB THD while sampling
at 2.5Msps. The extremely high sample rate-to-power ratio makes
the LTC2313-12 ideal for compact, low power, high speed systems.
The supply current decreases at lower sampling rates as the device
automatically enters nap mode after conversions.
The LTC2313-12 has a high speed SPI-compatible serial interface
that supports 1.8V, 2.5V, 3V and 5V logic. The fast 2.5Msps
throughput with no cycle latency makes the LTC2313-12 ideally
suited for a wide variety of high speed applications.
APPLICATIONS
n
n
n
n
n
n
Communication Systems
High Speed Data Acquisition
Handheld Terminal Interface
Medical Imaging
Uninterrupted Power Supplies
Battery Operated Systems
Automotive
5V Supply, Internal Reference, 2.5Msps,
12-Bit Sampling ADC
5V
LTC2313-12
2.2µF
VDD
CONV
REF
SCK
GND
SDO
2.2µF
TOP VIEW
VDD
REF
GND
AIN
8
7
6
5
1
2
3
4
CONV
SCK
SDO
OVDD
ANALOG INPUT
0V TO 4.096V
AIN
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTERS
OVDD
2.2µF
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
DIGITAL OUTPUT SUPPLY
1.8V TO 5V
231312 TA01a
LTC2313CTS8-12
LTC2313ITS8-12
LTC2313HTS8-12
fS = 2.5Msps, fIN = 497kHz 16k-pt FFT
0
VDD = 5V
SNR = 73dBFS
SINAD = 72.6dBFS
THD = –84dB
SFDR = 87dB
–20
–40
AMPLITUDE (dBFS)
n
–60
–80
–100
–120
–140
–160
4
0
250
500
750
INPUT FREQUENCY (kHz)
1000
231312 TA01b
Data Converters
LTC2313-14
14-Bit, 2.5Msps Serial Sampling ADC in TSOT
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
2.5Msps Throughput Rate
No Cycle Latency
Guaranteed 14-Bit No Missing Codes
Single 3V or 5V Supply
Low Noise: 77.5dB SNR
Low Power: 14mW at 2.5Msps and 3V Supply
Low Drift (20ppm/°C Maximum) 2.048V or 4.096V Internal
Reference
Sleep Mode with < 1µA Typical Supply Current
Nap Mode with Quick Wake-Up < 1 Conversion
Separate 1.8V to 5V Digital I/O Supply
High Speed SPI-Compatible Serial I/O
Guaranteed Operation from –40°C to 125°C
8-Lead TSOT-23 Package
The LTC®2313-14 is a 14-bit, 2.5Msps, serial sampling A/D
converter that draws only 5mA from a single 3V or 5V supply. The
LTC2313-14 contains an integrated low drift reference and reference
buffer providing a low cost, high performance (20ppm/°C maximum)
and space saving solution. The LTC2313-14 achieves outstanding
AC performance of 77dB SINAD and –85dB THD while sampling
at 2.5Msps. The extremely high sample rate-to-power ratio makes
the LTC2313-14 ideal for compact, low power, high speed systems.
The supply current decreases at lower sampling rates as the device
automatically enters nap mode after conversions.
The LTC2313-14 has a high speed SPI-compatible serial interface
that supports 1.8V, 2.5V, 3V and 5V logic. The fast 2.5Msps
throughput with no cycle latency makes the LTC2313-14 ideally
suited for a wide variety of high speed applications.
APPLICATIONS
n
n
n
n
n
n
Communication Systems
High Speed Data Acquisition
Handheld Terminal Interface
Medical Imaging
Uninterrupted Power Supplies
Battery Operated Systems
Automotive
5V Supply, Internal Reference, 2.5Msps,
14-Bit Sampling ADC
5V
LTC2313-14
2.2µF
VDD
CONV
REF
SCK
GND
SDO
2.2µF
TOP VIEW
VDD
REF
GND
AIN
8
7
6
5
1
2
3
4
CONV
SCK
SDO
OVDD
ANALOG INPUT
0V TO 4.096V
AIN
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTERS
OVDD
2.2µF
DIGITAL OUTPUT SUPPLY
1.8V TO 5V
TS8 PACKAGE
PACKAGE
TS8
8-LEAD
8-LEAD PLASTIC
PLASTIC TSOT-23
TSOT-23
231314 TA01
LTC2313CTS8-14
LTC2313ITS8-14
LTC2313HTS8-14
16k Point FFT, fS = 2.5Msps, fIN = 497kHz
0
VDD = 5V
SNR = 77.5dBFS
SINAD = 77dBFS
THD = –85dB
SFDR = 87dB
–20
–40
AMPLITUDE (dBFS)
n
–60
–80
–100
–120
–140
–160
0
250
500
750
INPUT FREQUENCY (kHz)
1000
231314 TA01b
5
Tiny All-in-One
14-Bit 4.5Msps SAR ADC
20ppm/°C Max Integrated Reference in 8mm2 TSOT
®
The LTC 2314-14 leads a family of highly integrated 14-/12-bit Successive Approximation Register (SAR) ADCs from 500ksps
to 5Msps, available in tiny 8-lead TSOT-23 packages. These ADCs integrate a precision bandgap reference with guaranteed
20ppm/ºC maximum temperature coefficient and an internal reference buffer in an 8mm2 footprint, saving space in high density
designs. They offer the flexibility of 3V or 5V supply operation and low power consumption, including nap and sleep modes.
Features
Complete 14-Bit/12-Bit Pin-Compatible SAR ADC Family
• 4.5Msps Throughput Rate
• Low Noise: 77.5dB SNR, -85dB THD
(5V Supply)
500ksps
2.5Msps
4.5Msps
14-Bit
2312-14
2313-14
2314-14
12-Bit
2312-12
2313-12
Power
Consumption
3V/5V
8mW/14mW
14mW/26mW
5Msps
• ±3.75LSB INL, ±0.99LSB DNL Max
(5V Supply)
• Low Power: 31mW at 4.5Msps
(5V Supply)
• Flexible 3V or 5V Supply Operation
• Internal Reference: 2.048V or
4.096V Span
• Guaranteed Operation –40°C to 125°C
• 8-Lead TSOT-23 Package
, LT, LTC, LTM, Linear Technology and the Linear logo are
registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
2315-12
18mW/ 31mW
19mW/ 32mW
Info & Free Samples
1-800-4-LINEAR
www.linear.com/LTC2314-14
Data Converters
LTC2376-20
20-Bit, 250ksps, Low Power SAR ADC
with 0.5ppm INL
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
250ksps Throughput Rate
±0.5ppm INL (Typ)
Guaranteed 20-Bit No Missing Codes
Low Power: 5.3mW at 250ksps, 5.3µW at 250sps
104dB SNR (Typ) at fIN = 2kHz
–125dB THD (Typ) at fIN = 2kHz
Digital Gain Compression (DGC)
Guaranteed Operation to 85°C
2.5V Supply
Fully Differential Input Range ±VREF
VREF Input Range from 2.5V to 5.1V
No Pipeline Delay, No Cycle Latency
1.8V to 5V I/O Voltages
SPI-Compatible Serial I/O with Daisy-Chain Mode
Internal Conversion Clock
16-Lead MSOP and 4mm × 3mm DFN Packages
The LTC®2376-20 is a low noise, low power, high speed 20-bit
successive approximation register (SAR) ADC. Operating from a
2.5V supply, the LTC2376-20 has a ±VREF fully differential input
range with VREF ranging from 2.5V to 5.1V. The LTC2376-20
consumes only 5.3mW and achieves ±2ppm INL maximum, no
missing codes at 20 bits with 104dB SNR.
The LTC2376-20 has a high speed SPI-compatible serial interface
that supports 1.8V, 2.5V, 3.3V and 5V logic while also featuring
a daisy-chain mode. The fast 250ksps throughput with no cycle
latency makes the LTC2376-20 ideally suited for a wide variety of
high speed applications. An internal oscillator sets the conversion
time, easing external timing considerations. The LTC2376-20
automatically powers down between conversions, leading to
reduced power dissipation that scales with the sampling rate.
The LTC2376-20 features a unique digital gain compression (DGC)
function, which eliminates the driver amplifier’s negative supply
while preserving the full resolution of the ADC. When enabled, the
ADC performs a digital scaling function that maps zero-scale code
from 0V to 0.1 • VREF and full-scale code from VREF to 0.9 • VREF. For
a typical reference voltage of 5V, the full-scale input range is now
0.5V to 4.5V, which provides adequate headroom for powering the
driving amplifier from a single 5.5V supply.
APPLICATIONS
n
n
n
n
n
n
Medical Imaging
High Speed Data Acquisition
Portable or Compact Instrumentation
Industrial Process Control
Low Power Battery-Operated Instrumentation
Automatic Test Equipment
2.5V
1.8V TO 5V
10µF
VREF
0V
VREF
0V
10Ω
+
6800pF
10Ω
OVDD
VDD
IN+
LTC2376-20
3300pF
–
0.1µF
IN–
6800pF
REF
GND
CHAIN
RDL/SDI
SDO
SCK
BUSY
CNV
REF/DGC
2.5V TO 5.1V
47µF
(X7R, 1210 SIZE)
TOP VIEW
CHAIN
1
VDD
2
GND
3
IN+
4
IN–
5
GND
6
REF
7
REF/DGC
8
16 GND
15 OVDD
17
GND
14 SDO
13 SCK
12 RDL/SDI
11 BUSY
10 GND
9 CNV
DE
DE PACKAGE
PACKAGE
16-LEAD (4mm
(4mm ×× 3mm)
3mm) PLASTIC
PLASTIC DFN
DFN
16-LEAD
LTC2376CDE-20
LTC2376IDE-20
SAMPLE CLOCK
VREF
237620 TA01
Integral Nonlinearity vs Output Code
TOP VIEW
CHAIN
VDD
GND
IN+
IN–
GND
REF
REF/DGC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
MS
MS PACKAGE
PACKAGE
16-LEAD PLASTIC
PLASTIC MSOP
MSOP
16-LEAD
LTC2376CMS-20
LTC2376IMS-20
GND
OVDD
SDO
SCK
RDL/SDI
BUSY
GND
CNV
2.0
1.5
1.0
INL ERROR (ppm)
n
0.5
0
–0.5
–1.0
–1.5
–2.0
Patents Pending. Protected by U.S. Patents, including 7705765, 7961132, 8319673.
0
262144
524288
786432
OUTPUT CODE
1048576
237620 TA02
7
Data Converters
LTC2377-20
20-Bit, 500ksps, Low Power SAR ADC
with 0.5ppm INL
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
500ksps Throughput Rate
±0.5ppm INL (Typ)
Guaranteed 20-Bit No Missing Codes
Low Power: 10.5mW at 500ksps, 10.5µW at 500sps
104dB SNR (Typ) at fIN = 2kHz
–125dB THD (Typ) at fIN = 2kHz
Digital Gain Compression (DGC)
Guaranteed Operation to 85°C
2.5V Supply
Fully Differential Input Range ±VREF
VREF Input Range from 2.5V to 5.1V
No Pipeline Delay, No Cycle Latency
1.8V to 5V I/O Voltages
SPI-Compatible Serial I/O with Daisy-Chain Mode
Internal Conversion Clock
16-Lead MSOP and 4mm × 3mm DFN Packages
The LTC®2377-20 is a low noise, low power, high speed 20-bit
successive approximation register (SAR) ADC. Operating from a
2.5V supply, the LTC2377-20 has a ±VREF fully differential input
range with VREF ranging from 2.5V to 5.1V. The LTC2377-20
consumes only 10.5mW and achieves ±2ppm INL maximum, no
missing codes at 20 bits with 104dB SNR.
The LTC2377-20 has a high speed SPI-compatible serial interface
that supports 1.8V, 2.5V, 3.3V and 5V logic while also featuring
a daisy-chain mode. The fast 500ksps throughput with no cycle
latency makes the LTC2377-20 ideally suited for a wide variety of
high speed applications. An internal oscillator sets the conversion
time, easing external timing considerations. The LTC2377-20
automatically powers down between conversions, leading to
reduced power dissipation that scales with the sampling rate.
The LTC2377-20 features a unique digital gain compression (DGC)
function, which eliminates the driver amplifier’s negative supply
while preserving the full resolution of the ADC. When enabled, the
ADC performs a digital scaling function that maps zero-scale code
from 0V to 0.1 • VREF and full-scale code from VREF to 0.9 • VREF. For
a typical reference voltage of 5V, the full-scale input range is now
0.5V to 4.5V, which provides adequate headroom for powering the
driving amplifier from a single 5.5V supply.
APPLICATIONS
n
n
n
n
n
n
Medical Imaging
High Speed Data Acquisition
Portable or Compact Instrumentation
Industrial Process Control
Low Power Battery-Operated Instrumentation
Automatic Test Equipment
2.5V
1.8V TO 5V
10µF
VREF
0V
VREF
0V
10Ω
+
10Ω
OVDD
VDD
6800pF
IN+
LTC2377-20
3300pF
–
0.1µF
IN–
6800pF
REF
GND
CHAIN
RDL/SDI
SDO
SCK
BUSY
CNV
REF/DGC
2.5V TO 5.1V
SAMPLE CLOCK
VREF
237720 TA01
47µF
(X7R, 1210 SIZE)
Integral Nonlinearity vs Output Code
TOP VIEW
CHAIN
1
VDD
2
GND
3
IN+
4
IN–
5
GND
6
REF
7
REF/DGC
8
8
2.0
16 GND
15 OVDD
17
GND
14 SDO
13 SCK
12 RDL/SDI
11 BUSY
10 GND
9 CNV
TOP VIEW
CHAIN
VDD
GND
IN+
IN–
GND
REF
REF/DGC
1
2
3
4
5
6
7
8
1.5
16
15
14
13
12
11
10
9
DE PACKAGE
PACKAGE
DE
16-LEAD (4mm
(4mm ××3mm)
3mm)PLASTIC
PLASTICDFN
DFN
16-LEAD
MS
MS PACKAGE
PACKAGE
16-LEAD PLASTIC MSOP
16-LEAD PLASTIC MSOP
LTC2377CDE-20
LTC2377IDE-20
LTC2377CMS-20
LTC2377IMS-20
GND
OVDD
SDO
SCK
RDL/SDI
BUSY
GND
CNV
1.0
INL ERROR (ppm)
n
0.5
0
–0.5
–1.0
–1.5
–2.0
0
262144
524288
786432
OUTPUT CODE
1048576
237720 TA02
Patents Pending. Protected by U.S. Patents, including 7705765, 7961132, 8319673.
20-Bit 1Msps SAR ADC
0.5ppm INL
IN+
0V
2.5V
Integral Nonlinearity vs Output Code
OVDD
1.8V to 5V
VDD
VREF
SPI
I/O
Up to 5V
IN–
2.0
1.5
1.0
INL Error (PPM)
2.5V to 5V
Up to 5V
0.5
0.0
–0.5
–1.0
GND
–1.5
–2.0
0V
0
262144
524288
786432
1048576
Output Code
No Latency SAR ADC Achieves 104dB SNR
®
The LTC 2378-20 SAR ADC achieves 20 bits of resolution with outstanding 0.5ppm INL and 104dB SNR performance with no
cycle latency and sample rates up to 1Msps. It offers uncompromised performance, low power dissipation and excellent
temperature stability for high precision signal chains. The LTC2378-20 family includes pin-compatible 20-/18-/16-bit SAR
ADCs from 250ksps up to 2Msps with serial SPI interface and explicit Busy and Chain pins that simplify digital timing.
Features
Complete 20-/18-/16-Bit Pin-Compatible SAR ADC Family
• 1Msps Throughput Rate
250ksps
500ksps
1Msps
20-Bit
104dB SNR
2376-20
2377-20
2378-20
18-Bit
101dB SNR
2376-18
2377-18
2378-18
16-Bit
96dB SNR
2376-16
2377-16
2378-16
• ±0.5ppm INL (Typ), ±2ppm INL (Max)
• 104dB SNR (Typ) at fIN = 2kHz
• –125dB THD (Typ) at fIN = 2kHz
• Low Power: 21mW at 1Msps,
21μW at 1ksps
• Fully Differential Input Range ±VREF
• VREF Input Range from 2.5V to 5.1V
• Digital Gain Compression Eliminates
Need for Negative Rails
• –40°C to +85°C Guaranteed
Temperature Range
• 16-pin MSOP and 4mm x 3mm
DFN Packages
, LT, LTC, LTM, Linear Technology and the Linear logo are
registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
1.6Msps
2Msps
2379-18
2380-16
Info & Free Samples
1-800-4-LINEAR
www.linear.com/LTC2378-20
Energy Harvesting
LTC3330
Nanopower Buck-Boost + DC/DC with Energy
Harvesting Battery Life Extender
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Dual Input, Single Output DC/DCs with Input
Prioritizer
Energy Harvesting Input: 3.0V to 20V Buck DC/DC
Primary Cell Input: 1.8V to 5.5V Buck-Boost DC/DC
Zero Battery IQ When Powering Load from
Harvested Energy
Ultralow Quiescent Current: 750nA at No-Load
Low Noise LDO Post Regulator
Integrated Supercapacitor Balancer
Up to 50mA of Output Current
Programmable DC/DC and LDO Output Voltages, Buck UVLO,
and Buck-Boost Peak Input Current
Integrated Low Loss Full-Wave Bridge Rectifier
Input Protective Shunt
Up to 25mA at VIN ≥ 20V
5mm × 5mm QFN-32 Package
The LTC®3330 integrates a high voltage energy harvesting power
supply plus a DC/DC converter powered by a primary cell battery
to create a single output supply for alternative energy applications.
The energy harvesting power supply, consisting of an integrated
full-wave bridge rectifier and a high voltage buck converter, harvests
energy from piezoelectric, solar, or magnetic sources. The primary
cell input powers a buck-boost converter capable of operation
down to 1.8V at its input. Either DC/DC converter can deliver energy
to a single output. The buck operates when harvested energy is
available, reducing the quiescent current draw on the battery to
essentially zero. The buck-boost takes over when harvested energy
goes away.
APPLICATIONS
Voltage and current settings for both inputs and outputs are
programmable via pin-strapped logic inputs.
The LTC3330 is available in a 5mm × 5mm QFN-32 package.
4V TO 18V
LDO_EN
VIN3
PGLDO
PGVOUT
EH_ON
OUT0
OUT1
TOP VIEW
+
BAL 1
24 LDO0
SCAP 2
23 LDO1
VIN2 3
3V TO 18V
SOLAR
PANEL
32 31 30 29 28 27 26 25
–
UV3 4
4.7µF, 6V
19 IPK2
UV0 7
18 IPK1
AC1 8
17 IPK0
BAT
SWA
SWB
9 10 11 12 13 14 15 16
VOUT
VIN
SW
LTC3330
UH PACKAGE
UH PACKAGE
32-LEAD (5mm
(5mm ×
× 5mm)
32-LEAD
5mm) PLASTIC
PLASTIC QFN
QFN
LTC3330EUH
LTC3330IUH
SWA
CAP
SWB
VIN2
VOUT
PIEZO
MIDE
V25W
22µH
22µH
1.2V TO 5V
50mA
LDO_IN
20 LDO_OUT
UV1 6
SW
AC2
21 LDO_IN
33
GND
UV2 5
AC1
1µF
6V
10µF
25V
22 LDO2
CAP
n
OUT2
n
VIN
n
Energy Harvesting
Solar Powered Systems with Primary Cell Backup
Wireless HVAC Sensors and Security Devices
Mobile Asset Tracking
AC2
n
A low noise LDO post regulator and a supercapacitor balancer are
also integrated, accommodating a wide range of output storage
configurations.
+
PRIMARY
CELL
1.8V TO 5.5V
1µF
6V
10mF
2.5V
SCAP
BAT
BAL
3
3
3
4
OUT[2:0]
LDO_EN
LDO[2:0]
EH_ON
10mF
2.5V
OPTIONAL
PGVOUT
IPK[2:0]
22µF
6V
PGLDO
UV[3:0]
1.2V TO 3.6V
50mA
LDO_OUT
GND
VIN3
1µF
6V
2.2µF
6V
3330 TA01a
10
High Frequency
LTC5510
1MHz to 6GHz Wideband High Linearity
Active Mixer
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Input/LO Frequency Range to 6GHz
50Ω Matched Input from 30MHz to >3GHz
Capable of Upconversion or Downconversion
OIP3: 27dBm at fOUT = 1575MHz
1.5dB Conversion Gain
Noise Figure: 11.6dB at fOUT = 1575MHz
High Input P1dB: 11dBm at 5V
5V or 3.3V Supply at 105mA
Shutdown Control
LO Input Impedance Always Matched
0dBm LO Drive Level
0n-Chip Temperature Monitor
–40°C to 105°C Operation (TC)
16-Lead (4mm × 4mm) QFN Package
The LTC®5510 is a high linearity mixer optimized for applications
requiring very wide input bandwidth, low distortion, and low LO
leakage. The chip includes a double-balanced active mixer with an
input buffer and a high speed LO amplifier. The input is optimized
for use with 1:1 transmission-line baluns, allowing very wideband
impedance matching. The mixer can be used for both upconversion
and downconversion and can be used in wideband systems.
The LO can be driven differentially or single-ended and requires
only 0dBm of LO power to achieve excellent distortion and noise
performance, while also reducing external drive circuit requirements.
The LTC5510 offers low LO leakage, greatly reducing the need for
output filtering to meet LO suppression requirements.
The LTC5510 is optimized for 5V but can also be used with a 3.3V
supply with slightly reduced performance. The shutdown function
allows the part to be disabled for further power savings.
APPLICATIONS
30MHz to 4GHz Up/Down Mixer for Wideband Receiver
LO
50Ω
TEMPERATURE
MONITOR
TCM1-43X+
1:1
IN
30MHz TO
4GHz
50Ω
0.1µF
0.6pF
0.1µF
0.1µF
TEMP
0.1µF
LO+
BD1222J50200AHF
4:1
LO–
LTC5510
OUT–
OUT
1575MHz
50Ω
6.8nH
BIAS
LGND
EN VCC1
6.8pF
6.8nH
OUT+
IN+
IN–
VCC2 IADJ
4.75kΩ
10nF
EN
5V
10nF
1µF
5510 TA01
Conversion Gain, IIP3 and NF vs Input Frequency
GND
LO–
LO+
TOP VIEW
30
16 15 14 13
12 GND
TEMP 1
IN+ 2
11 OUT+
17
IN– 3
10 OUT –
LGND 4
9
6
7
GND
8
IADJ
5
VCC2
n
TP
n
Wideband Receivers/Transmitters
Cable Downlink Infrastructure
HF/VHF/UHF Mixer
Wireless Infrastructure
EN
n
VCC1
n
UF
UFPACKAGE
PACKAGE
16-LEAD(4mm
(4mm××4mm)
4mm)PLASTIC
PLASTICQFN
QFN
16-LEAD
LTC5510IUF
GAIN (dB), IIP3 (dBm), NF (dB)
n
25
IIP3
20
HS LO
15
LS LO
NF
10
fOUT = 1575MHz
PIN = –10dBm
PLO = 0dBm
TC = 25°C
5
GC
0
0
1000
2000
3000
INPUT FREQUENCY (MHz)
4000
5510 TA01a
11
Hot Swap Controller
LTC4227
Dual Ideal Diode and Single
Hot Swap Controller
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Power Path and Inrush Current Control for Redundant
Supplies
Low Loss Replacement for Power Schottky Diodes
Allows Safe Hot Swapping from a Live Backplane
2.9V to 18V Operating Range
Controls N-Channel MOSFETs
Limits Peak Fault Current in ≤1µs
0.5µs Ideal Diode Turn-On and Reverse Turn-Off Time
Adjustable Current Limit with Circuit Breaker
Smooth Switchover without Oscillation
Adjustable Current Limit Fault Delay
Fault and Power Status Output
20-Lead 4mm × 5mm QFN and 16-Lead SSOP Packages
The LTC®4227 offers ideal diode-OR and Hot Swap™ functions
for two power rails by controlling external N-channel MOSFETs.
MOSFETs acting as ideal diodes replace two high power Schottky
diodes and the associated heat sinks, saving power and board area.
A Hot Swap control MOSFET allows a board to be safely inserted
and removed from a live backplane by limiting inrush current. The
supply output is also protected against short-circuit faults with a
fast acting current limit and internal timed circuit breaker.
The LTC4227 regulates the forward voltage drop across the
MOSFETs to ensure smooth current transfer from one supply to the
other without oscillation. The ideal diodes turn on quickly to reduce
the load voltage droop during supply switchover. If the input supply
fails or is shorted, a fast turn-off minimizes reverse-current transients.
The LTC4227 allows turn-on/off control, and reports fault and power
good status for the supply.
APPLICATIONS
PART
OVERCURRENT FAULT
START-UP DELAY
LTC4227-1
LATCH OFF
100ms
LTC4227-2
RETRY
100ms
LTC4227-3
LATCH OFF
1.6ms
LTC4227-4
RETRY
1.6ms
Diode-OR with Hot Swap Application
SiR462DP
12V
0.1µF
SiR462DP
12V
0.006Ω
Si7336ADP
+
0.1µF
137k
CPO1 IN1 DGATE1 CPO2
IN2 DGATE2 SENSE+
12V
7.6A
100µF
SENSE– HGATE OUT
ON
20k
FAULT
LTC4227
PWRGD
EN
BACKPLANE
CONNECTOR
INTVCC
D2ON
GND
0.1µF
CARD
CONNECTOR
TMR
4227 TA01a
0.1µF
OUT
HGATE
CPO1
TOP VIEW
DGATE1
20 19 18 17
SENSE– 1
16 NC
SENSE+ 2
15 ON
IN1 3
14 EN
21
INTVCC 4
13 TMR
GND 5
12 D2ON
IN2 6
11 FAULT
8
9 10
PWRGD
7
NC
n
Redundant Power Supplies and Supply Holdup
Computer Systems and Servers
Telecom Networks
CPO2
n
DGATE2
n
UFD PACKAGE
PACKAGE
UFD
20-LEAD (4mm × 5mm) PLASTIC QFN
20-LEAD (4mm × 5mm) PLASTIC QFN
LTC4227CUFD-1
LTC4227CUFD-2
LTC4227CUFD-3
LTC4227CUFD-4
12
LTC4227IUFD-1
LTC4227IUFD-2
LTC4227IUFD-3
LTC4227IUFD-4
Smooth Supply Switchover
TOP VIEW
DGATE1
1
16 CPO1
SENSE–
2
15 HGATE
SENSE+
3
14 OUT
IN1
4
13 ON
INTVCC
5
12 TMR
GND
6
11 D2ON
IN2
7
10 PWRGD
DGATE2
8
9
IN2
1V/DIV
IIN1
2A/DIV
CPO2
GN PACKAGE
PACKAGE
GN
16-LEAD PLASTIC SSOP NARROW
16-LEAD PLASTIC SSOP NARROW
LTC4227CGN-1
LTC4227CGN-2
IN1
1V/DIV
LTC4227IGN-1
LTC4227IGN-2
IIN2
2A/DIV
200ns/DIV
4227 TA01b
Ideal Diode Bridge
Output
9V to 72V
Input
DC to 600Hz
Active Diode Bridge Controller Minimizes
Voltage Drop & Heat Sinking Requirements
®
The workhorse of AC to DC rectification, the classic four-diode bridge, just got a makeover. The LT 4320 simulates an ideal
diode bridge by controlling four N-channel MOSFETs, significantly reducing heat dissipation and maximizing voltage to
the application. Heat sinks can be eliminated, reducing solution size and cost. More power is available to the end
application instead of being wasted as heat. Low voltage applications also benefit with the increased headroom provided by
the MOSFET bridge.
Features
Temperature Rise vs Load Current
• Low Loss Replacement for Diode
Bridge
• Maximizes Power Efficiency
• Eliminates Thermal Design Problems
• Maximizes Available Voltage
• 9V to 72V Operating Voltage Range
• DC to 600Hz Operation
• IQ = 1.5mA (Typical)
• –55°C to +125°C Guaranteed
Temperature Range
• 8-Pin 3mm x 3mm DFN and 12-Lead
MSOP Packages
www.linear.com/product/LT4320
90
1-800-4-LINEAR
MOSFET FDMS86500
80
Temperature Rise (°C)
• Controls N-Channel MOSFETs
Info & Free Samples
Diode SMB1040
70
60
50
40
30
20
10
0
video.linear.com/136
0
2
4
6
Current (A)
8
10
, LT, LTC, LTM, Linear Technology and the Linear logo are
registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Ideal Diode Bridge
LT4320/LT4320-1
Ideal Diode Bridge Controller
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Maximizes Power Efficiency
Eliminates Thermal Design Problems
DC to 600Hz
9V to 72V Operating Voltage Range
IQ = 1.5mA (Typical)
Maximizes Available Voltage
Available in 8-Lead (3mm × 3mm) DFN and 12-Lead
MSOP Packages
The LT®4320/LT4320-1 are ideal diode bridge controllers that drive
four N-channel MOSFETs, supporting voltage rectification from
DC to 600Hz. By maximizing available voltage and reducing power
dissipation (see thermograph comparison below), the ideal diode
bridge simplifies power supply design and reduces power supply
cost, especially in low voltage applications.
An ideal diode bridge also eliminates thermal design problems,
costly heat sinks, and greatly reduces PC board area. The LT4320’s
internal charge pump supports an all-NMOS design, which
eliminates larger and more costly PMOS switches. If the power
source fails or is shorted, a fast turn-off minimizes reverse current
transients.
APPLICATIONS
n
n
n
n
n
Security Cameras
Terrestrial or Airborne Power Distribution Systems
Power-over-Ethernet Powered Device with a Secondary Input
Polarity-Agnostic Power Input
Diode Bridge Replacement
The LT4320 is designed for DC to 60Hz voltage rectification, while
the LT4320-1 is designed for DC to 600Hz voltage rectification.
Higher frequencies of operation are possible depending on MOSFET
size and operating load current.
TOP VIEW
IN2 1
TG2 2
BG2 3
9
BG1 4
+
8
IN1
7
TG1
6
OUTP
5
OUTN
TG1
DD
DD PACKAGE
PACKAGE
8-LEAD (3mm
(3mm ×× 3mm)
3mm) PLASTIC
PLASTIC DFN
DFN
8-LEAD
~
LT4320IDD
LT4320IDD-1
TOP VIEW
IN2
TG2
NC
NC
BG2
BG1
1
2
3
4
5
6
13
IN1
TG1
NC
OUTP
NC
OUTN
MSE
MSE PACKAGE
PACKAGE
12-LEAD
12-LEAD PLASTIC
PLASTIC MSOP
MSOP
TG2
LT4320
OUTPUT
9V TO 72V
IN2
IN1
BG2
12
11
10
9
8
7
OUTP
OUTN
BG1
INPUT
DC TO 600Hz
–
~
4320 TA01a
LT4320IMSE
LT4320IMSE-1
Thermograph of Passive Diode Bridge
Thermograph of LT4320 Driving Four MOSFETs
Temperature Rise (°C)
CURRENT
(A)
MOSFET
2.5mΩ
DIODE
SBM
1040
2
0.6
15
4
3.5
32
6
6.7
49
8
11
66
10
16
84
DC Input, on Same PCB
SBM1040 (×4)
14
4320 TA01b
4320 TA01c
LT4320+2.5mΩ FET (×4)
CONDITIONS: 24V ACIN, 9.75A DC LOAD ON SAME PCB
Patent Pending.
LDO Linear Regulators
LT3007 Series
3µA IQ, 20mA, 45V Low Dropout Fault Tolerant
Linear Regulators
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
FMEA Fault Tolerant:
Output Stays at or Below Regulation Voltage During
Adjacent Pin Short or if a Pin Is Left Floating
Ultralow Quiescent Current: 3µA
Input Voltage Range: 2.0V to 45V
Output Current: 20mA
Dropout Voltage: 300mV
Adjustable Output (VADJ = VOUT(MIN) = 600mV)
Fixed Output Voltages: 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V
Output Tolerance: ±2% Over Load, Line and Temperature
Stable with Low ESR, Ceramic Output Capacitors
(2.2µF Minimum)
Shutdown Current: <1µA
Current Limit Protection
Reverse-Battery Protection
Thermal Limit Protection
TSOT-23 Package
The LT®3007 series are micropower, low dropout voltage (LDO)
linear regulators. The devices supply 20mA output current with
a dropout voltage of 300mV. No-load quiescent current is 3µA.
Ground pin current remains at less than 5% of output current as
load increases. In shutdown, quiescent current is less than 1µA.
The LT3007 regulators optimize stability and transient response with
low ESR ceramic capacitors, requiring a minimum of only 2.2µF.
The regulators do not require the addition of ESR as is common
with other regulators. Internal protection circuitry includes current
limiting, thermal limiting, reverse-battery protection and reversecurrent protection.
The LT3007 series are ideal for applications that require moderate
output drive capability coupled with ultralow standby power
consumption. The device is available in fixed output voltages of
1.2V, 1.5V, 1.8V, 2.5V, 3.3V and 5V, and an adjustable version with
an output voltage range of 0.6V to 44.5V. The LT3007 is available in
the thermally enhanced 8-lead TSOT-23 package.
APPLICATIONS
n
n
n
n
n
Automotive
Low Current Battery-Powered Systems
Keep-Alive Power Supplies
Remote Monitoring
Utility Meters
Low Power Industrial Applications
3.3V, 20mA Supply with Shutdown
IN
VIN
3.8V TO
45V
1µF
SHDN
GND
GND
GND
1
2
3
4
OUT
SHDN
8
7
6
5
VOUT
3.3V
20mA
SENSE
GND
ADJ/SENSE**
OUT
NC
IN
3007 TA01a
Dropout Voltage/Quiescent Current
500
450
6
ILOAD = 20mA
DROPOUT
VOLTAGE
400
350
5
4
300
250
IQ
200
3
2
150
100
QUIESCENT CURRENT (µA)
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
8-LEAD PLASTIC TSOT-23
LT3007ETS8
LT3007ITS8-1.8
LT3007ITS8
LT3007ETS8-2.5
LT3007ETS8-1.2 LT3007ITS8-2.5
LT3007ITS8-1.2
LT3007ETS8-3.3
LT3007ETS8-1.5 LT3007ITS8-3.3
T3007ITS8-1.5
LT3007ETS8-5
LT3007ETS8-1.8 LT3007ITS8-5
2.2µF
LT3007-3.3
TOP VIEW
DROPOUT VOLTAGE (mV)
n
1
50
0
–50 –25
0
0
25 50 75 100 125 150
TEMPERATURE (°C)
3007 TA01b
15
LDO Linear Regulators
LT3055
500mA, Linear Regulator with Precision
Current Limit and Diagnostics
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Output Current: 500mA
Dropout Voltage: 350mV
Input Voltage Range: 2V to 45V
Programmable Precision Current Limit: ±10%
Output Current Monitor: 1/500th of IOUT
Programmable Minimum IOUT Monitor
Temperature Monitor: 10mV/°C
FAULT Indicator: Current Limit, Thermal Limit or Minimum IOUT
Low Noise: 25μVRMS (10Hz to 100kHz)
Adjustable Output (VREF = VOUT(MIN) = 0.6V)
Output Tolerance: ±2% Over Load, Line and Temperature
Stable with Low ESR, Ceramic Output Capacitors (3.3μF Minimum)
Shutdown Current: <1μA
Reverse Battery and Thermal Limit Protection
16-Lead 4mm × 3mm DFN and MSOP Packages
The LT®3055 is a micropower, low noise, low dropout voltage (LDO)
linear regulator. The device supplies 500mA of output current with a
dropout voltage of 350mV. A 10nF bypass capacitor reduces output
noise to 25μVRMS in a 10Hz to 100kHz bandwidth and soft starts the
reference. The LT3055’s ±45V input voltage rating combined with its
precision current limit and diagnostic functions make the IC an ideal
choice for robust, high reliability applications.
A single resistor programs the LT3055’s current limit, accurate to ±10%
over a wide input voltage and temperature range. Another resistor
programs the LT3055’s minimum output current monitor, useful for
detecting open-circuit conditions. The current monitor function sources
a current equal to 1/500th of output current. Logic fault pins assert low
if the LT3055 is in current limit (FAULT2), operating below its minimum
output current (FAULT1) or is in thermal limit (both FAULT1 and FAULT2).
PWRGD indicates output regulation. The TEMP pin indicates average die
temperature.
APPLICATIONS
n
n
n
n
n
The LT3055 optimizes stability and transient response with low ESR
ceramic capacitors, requiring a minimum of 3.3μF. Internal protection
circuitry includes current limiting, thermal limiting, reverse battery
protection, reverse current protection and reverse output protection.
Protected Antenna Supplies
Automotive Telematics
Industrial Applications (Trucks, Forklifts, etc.)
High Reliability Applications
Noise-Sensitive RF or DSP Supplies
The LT3055 is available as an adjustable device with an output
voltage range from 0.6V to 40V.
5V Supply with 497mA Precision Current Limit, 10mA IMIN
VIN
12V
+
IN
10µF
22nF
0.1µF
200k
200k
200k
604Ω
(THRESHOLD = 497mA)
120k
(THRESHOLD = 10mA)
LT3055
OUT
SHDN
FAULT1
FAULT2
PWRGD
IMAX
ADJ
IMON
TEMP
IMIN REF/BYP
GND
442k
1%
60.4k
1%
1k
(ADC
FULL-SCALE = 1V)
IN
1
IN
2
SHDN
3
FAULT1
4
FAULT2
5
PWRGD
6
TEMP
7
IMON
8
17
GND
12 GND
11 REF/BYP
10 IMAX
9 IMIN
DE PACKAGE
16-LEAD (4mm
(4mm ×× 3mm)
3mm) PLASTIC
PLASTIC DFN
DFN
16-LEAD
LT3055EDE
LT3055IDE
16
TO
µP
ADC
Precision Current Limit, RIMAX = 604Ω
550
16 OUT
15 OUT
14 ADJ
13 GND
0.1µF
TOP VIEW
IN
IN
SHDN
FAULT1
FAULT2
PWRGD
TEMP
IMON
1
2
3
4
5
6
7
8
17
GND
16
15
14
13
12
11
10
9
MSE PACKAGE
16-LEAD
16-LEAD PLASTIC
PLASTIC MSOP
MSOP
LLT3055EMSE
LT3055IMSE
LT3055MPMSE
LT3055HMSE
OUT
OUT
ADJ
GND
GND
REF/BYP
IMAX
IMIN
TO
µP
ADC
10nF
3055 TA01a
TOP VIEW
5V
10µF
10nF
CURRENT LIMIT FAULT THRESHOLD (mA)
n
540
VOUT(NOMINAL) = 5V
530
520
510
500
490
VIN = 7V
VIN = 5.6V
480
470
460
450
–75 –50 –25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
3055 TA01b
LDO Linear Regulators
LT3081
1.5A Single Resistor Rugged Linear
Regulator with Monitors
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Extended Safe Operating Area
Maximum Output Current: 1.5A
Stable with or without Input/Output Capacitors
Wide Input Voltage Range: 1.2V to 36V
Single Resistor Sets Output Voltage
Output Current Monitor: IMON = IOUT/5000
Junction Temperature Monitor: 1µA/°C
Output Adjustable to 0V
50µA SET Pin Current: 1% Initial Accuracy
Output Voltage Noise: 27µVRMS
Parallel Multiple Devices for Higher Current or Heat Spreading
Programmable Current Limit
Reverse-Battery and Reverse-Current Protection
<1mV Load Regulation Typical Independent of VOUT
<0.001%/V Line Regulation Typical
Available in Thermally Enhanced 12-Lead 4mm × 4mm DFN and
16-Lead TSSOP, 7-Lead DD-Pak and 7-Lead TO-220
The LT®3081 is a 1.5A low dropout linear regulator designed
for rugged industrial applications. Key features of the IC are the
extended safe operating area (SOA), output current monitor,
temperature monitor and programmable current limit. The LT3081
can be paralleled for higher output current or heat spreading.
The device withstands reverse input and reverse output-to-input
voltages without reverse current flow.
APPLICATIONS
n
n
n
n
n
All Surface Mount Power Supply
Rugged Industrial Power Supply
Post Regulator for Switching Supplies
Low Output Voltage Supply
Intrinsic Safety Applications
The LT3081’s precision 50µA reference current source allows a
single resistor to program output voltage to any level between zero
and 34.5V. The current reference architecture makes load regulation
independent of output voltage. The LT3081 is stable with or without
input and output capacitors.
The output current monitor (IOUT/5000) and die junction temperature
output (1µA/°C) provide system monitoring and debug capability.
In addition, a single resistor pro-grams current limit.
Internal protection circuitry includes reverse-battery and reversecurrent protection, current limiting and thermal limiting. The LT3081
is offered in the 16-lead TSSOP (with exposed pad for improved
thermal performance), 7-lead TO-220, 7-lead DD-Pak, and an
12-lead 4mm × 4mm DFN.
Wide Safe Operating Area Supply
VIN
IN
LT3081
TOP VIEW
TOP VIEW
OUT
1
12 IN
OUT
2
11 IN
OUT
3
OUT
4
ILIM
5
SET
6
10 IN
13
OUT
9 IN
8 TEMP
7 IMON
OUT
1
16 OUT
OUT
2
15 IN
OUT
3
14 IN
OUT
4
17
OUT
ISET
50µA
+
–
OUT
13 IN
OUT
5
ILIM
6
11 TEMP
SET
7
10 IMON
OUT
8
9
12 IN
TEMP
RTEMP
1k
SET IMON
RSET
30.1k
COUT*
10µF
ILIM
RIMON
1k
RILIM
6.04k
OUT
DF PACKAGE
PACKAGE
DF
12-LEAD (4mm × 4mm) PLASTIC DFN
12-LEAD
(4mm × 4mm) PLASTIC DFN
FE
FE PACKAGE
PACKAGE
16-LEAD PLASTIC
PLASTIC TSSOP
16-LEAD
TSSOP
LT3081EDF
LT3081IDF
LT3081EFE
LT3081IFE
IOUT
1.5V
RLOAD* 1.5A
5mA
MIN
3081 TA01a
*OPTIONAL
SET Pin Current
50.5
50.4
IL = 5mA
50.3
FRONT VIEW
TAB IS
OUT
7
6
5
4
3
2
1
PACKAGE
RRPACKAGE
7-LEADPLASTIC
PLASTIC DD
7-LEAD
DD
LT3081ER
LT3081IR
FRONT VIEW
NC
IN
TEMP
OUT
IMON
SET
ILIM
TAB IS
OUT
7
6
5
4
3
2
1
T7 PACKAGE
T7 PACKAGE
7-LEAD
PLASTIC
TO-220
7-LEAD
PLASTIC
TO-220
LT3081ET7
LT3081IT7
NC
IN
TEMP
OUT
IMON
SET
ILIM
SET PIN CURRENT (µA)
n
50.2
50.1
50.0
49.9
49.8
49.7
49.6
49.5
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
3081 TA01b
17
LDO Linear Regulators
LT3090
–36V, 600mA Negative Linear Regulator
with Programmable Current Limit
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Output Current: 600mA
Single Resistor Sets Output Voltage
50µA SET Pin Current: ±1% Initial Accuracy
Programmable Current Limit
Bipolar Output Current Monitor
Parallelable for Higher Current and Heat Spreading
Low Dropout Voltage: 300mV
Low Output Noise: 20µVRMS (10Hz to 100kHz)
Configurable as 3-Terminal Floating Regulator
Wide Input Voltage Range: –1.5V to –36V
Rail-to-Rail Output Voltage Range: 0V to –35.5V
Positive/Negative Shutdown Logic or UVLO
Internal Back-Up Current Limit with Foldback
Load Regulation: 100µV (1mA to 600mA)
Line Regulation: 20ppm/V
Stable with 4.7µF Minimum Output Capacitor
Stable with Ceramic or Tantalum Capacitors
Reverse Output Protection
Thermally Enhanced 10-Lead MSOP and 10-Lead
0.75mm × 3mm × 3mm DFN Packages
The LT®3090 is a 600mA, low dropout negative linear regulator
that is easily parallelable to increase output current or spread heat
on surface mounted boards. Designed with a precision current
reference followed by a high performance rail-to-rail voltage buffer,
this regulator finds use in applications requiring precision output,
high current with no heat sink, output adjustability to zero and low
dropout voltage. This new architecture can also be configured as a
3-terminal floating regulator.
The LT3090 features fast transient response, high PSRR and output
noise as low as 20µVRMS, making it ideal for noise sensitive RF
applications. The LT3090’s architecture allows it to generate a wide
output voltage range (0V to –35.5V) while maintaining unity gain
operation. This yields virtually constant bandwidth, load regulation,
PSRR and noise, regardless of the programmed output voltage.
The LT3090 supplies 600mA at a typical dropout voltage of 300mV.
Operating quiescent current is nominally 1mA and drops to
<< 1µA in shutdown. A single resistor adjusts the LT3090’s precision
programmable current limit. The LT3090’s bipolar current monitor
either sinks a current (0.5mA/A) or sources a current (1mA/A)
proportional to output current. Built-in protection includes reverse
output protection, internal current limit with foldback and thermal
shutdown with hysteresis.
APPLICATIONS
n
n
n
n
Post Regulator for Switching Supplies
Low Noise Instrumentation and RF Supplies
Rugged Industrial Supplies
Precision Power Supplies
TOP VIEW
IN
1
IN
2
ILIM
3
IMONP
4
IMONN
5
10 OUT
11
IN
9 OUT
TO ADC
49.9k
3.32k
8 GND
6 SHDN
LT3090
SET
GND
DD PACKAGE
10-LEAD
10-LEAD (3mm
(3mm ×× 3mm)
3mm) PLASTIC
PLASTIC DFN
DFN
+
LT3090EDD
LT3090IDD
LT3090HDD
LT3090MPDD
–
IN
IN
IN
ILIM
IMONP
IMONN
1
2
3
4
5
6
13
IN
4.7µF
VIN
–3.3V
12
11
10
9
8
7
MSE PACKAGE
12-LEAD
12-LEAD PLASTIC
PLASTIC MSOP
MSOP
LT3090EMSE
LT3090IMSE
LT3090HMSE
LT3090MPMSE
4.7µF
7 SET
TOP VIEW
18
0.1µF
OUT
OUT
OUT
GND
SET
SHDN
50µA
IMONP
OUT
VOUT
–2.5V
MAX IOUT
600mA
IMONN
IN
3.3V
SHDN
ILIM
0.1µF
10k
3090 TA01
LED Driver
LT3955
60VIN LED Converter with Internal
PWM Generator
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
3000:1 True Color PWM™ Dimming for LEDs
Wide VIN Range: 4.5V to 60V
Rail-to-Rail Current Sense Range: 0V to 80V
Internal 80V/3.5A Switch
Programmable PWM Dimming Signal Generator
Constant Current (±3%) and Constant-Voltage (±2%)
Regulation
Accurate Analog Dimming
Drives LEDs in Boost, SEPIC, CUK, Buck Mode,
Buck-Boost Mode, or Flyback Configuration
Output Short-Circuit Protected Boost
Open LED Protection and Reporting
Adjustable Switching Frequency: 100kHz to 1MHz
Programmable VIN UVLO with Hysteresis
C/10 Indication for Battery Chargers
Low Shutdown Current: <1µA
Thermally Enhanced 5mm × 6mm QFN Package
The LT®3955 is a DC/DC converter designed to operate as a
constant-current source and constant-voltage regulator. It features
an internal low side N-channel MOSFET rated for 80V/3.5A.
The LT3955 is ideally suited for driving high current LEDs, but
also has features to make it suitable for charging batteries and
supercapacitors. The fixed frequency, current mode architecture
results in stable operation over a wide range of supply and output
voltages. A voltage feedback pin serves as the input for several LED
protection features, and also makes it possible for the converter to
operate as a constant-voltage source. A frequency adjust pin allows
the user to program the frequency from 100kHz to 1MHz to optimize
efficiency, performance or external component size.
The LT3955 senses output current at the high side or at the low
side of the load. The PWM input can be configured to self-oscillate
at fixed frequency with duty ratio programmable from 4% to 96%.
When driven by an external signal, the PWM input provides LED
dimming ratios of up to 3000:1. The CTRL input provides additional
analog dimming capability.
APPLICATIONS
94% Efficiency 20W Boost LED Driver with Internal PWM Dimming
VIN
5V TO
60V
22µH
4.7µF
×2
499k
VIN
36 35 34 33 32 31 30
SYNC 1
28 ISP
EN/UVLO 2
27 ISN
INTVCC 3
37
GND
GND 4
25 FB
165k
INTVCC
DIM
124k
23 PWMOUT
10nF
38
SW
SW 8
SW 9
LT3955
28.7k
350kHz
20 SW
300mA
ISN
20W LED
STRING
(CURRENT
DERATED FOR
VIN < 9V)
FB
VMODE
DIM/SS
SYNC
PWM
RT
PWMOUT
VC GND GNDK INTVCC
5.1k
47nF
4.7nF
300Hz
21 SW
0.82Ω
1M
100k
24 GND
VIN 6
CTRL
PGND
ISP
VREF
1M
2.2µF
×5
SW
EN/UVLO
147k
VC
CTRL
VREF
PWM
VMODE
TOP VIEW
DIM/SS
16.9k
INTVCC
1µF
NC 10
3955 TA01a
PGND
PGND
PGND
12 13 14 15 16 17
PGND
n
PGND
n
High Power LEDs
Output Short-Circuit Protected Boost
Battery and Supercap Chargers
Accurate Current Limited Voltage Regulators
RT
n
GNDK
n
UHE PACKAGE
PACKAGE
UHE
36-LEAD (5mm × 6mm) PLASTIC QFN
36-LEAD
(5mm × 6mm) PLASTIC QFN
LT3955EUHE
LT3955IUHE
NOTE: GND, GNDK AND SIGNAL LEVEL COMPONENTS MUST BE CONNECTED EXTERNALLY AS SHOWN.
AN INTERNAL CONNECTION BETWEEN GNDK AND PGND PINS PROVIDES GROUNDING TO THE SUPPLY.
PWM Dimming Waveforms at Various
DIM Voltage Settings
VDIM = 8V
DCPWM = 97.2%
VDIM = 3.87V
DCPWM = 50%
ILED
0.3A/
DIV
VDIM = 1.47V
DCPWM = 10%
0.5ms/DIV
VIN = 24V, VLED = 65V
Protected by U.S. Patents, including 7199560, 7321203.
3955 TA01b
VDIM = 0V
DCPWM = 2.8%
19
µModule Regulators
LTM4637
20A DC/DC µModule Step-Down Regulator
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Complete 20A Switch Mode Power Supply
4.5V to 20V Input Voltage Range
0.6V to 5.5V Output Voltage Range
±1.5% Total DC Output Voltage Error (–40°C to 125°C)
Differential Remote Sense Amplifier for Precision Regulation
for (VOUT ≤ 3.3V)
Current Mode Control/Fast Transient Response
Parallel Current Sharing (Up to 80A)
Frequency Synchronization
Selectable Pulse-Skipping or Burst Mode® Operation
Soft-Start / Voltage Tracking
Up to 88% Efficiency (12VIN, 1.8VOUT)
Overcurrent Foldback Protection
Output Overvoltage Protection
Internal Temperature Monitor
Overtemperature Protection
15mm × 15mm × 4.32mm LGA Package
The LTM®4637 is a complete 20A output high efficiency switch
mode step-down DC/DC µModule (micromodule) regulator. Included
in the package are the switching controller, power FETs, inductor
and compensation components. Operating over an input voltage
range from 4.5V to 20V, the LTM4637 supports an output voltage
range of 0.6V to 5.5V, set by a single external resistor. Only a few
input and output capacitors are needed.
Current mode operation allows precision current sharing of up
to four LTM4637 regulators to obtain up to 80A output. High
switching frequency and a current mode architecture enable a
very fast transient response to line and load changes without
sacrificing stability. The device supports frequency synchronization,
multiphase/current sharing, Burst Mode operation and output
voltage tracking for supply rail sequencing. A diode-connected PNP
transistor is available for use as an internal temperature monitor.
The LTM4637 is offered in a 15mm × 15mm × 4.32mm LGA
package. The LTM4637 is RoHS compliant. The LTM4637 is pin
compatible with the LTM4627, a 15A DC/DC µModule regulator.
APPLICATIONS
n
n
n
Telecom Servers and Networking Equipment
Industrial Equipment
Medical Systems
High Ambient Temperature Systems
1
2
3
VIN
TOP VIEW
MODE_PLLIN
INTVCC
TRACK/SS
4
5
6
7
8
9
10
2.2µF
VIN
12V
22µF
16V
×4
COMP
11
12
10k
0.1µF
VIN
EXTVCC INTVCC PGOOD
COMP
VOUT
TRACK/SS
VOUT_LCL
RUN
DIFF_OUT
LTM4637
fSET
VOSNS+
MODE_PLLIN
VOSNS–
TEMP
A
VIN
12VIN, 1.2VOUT, 20A DC/DC µModule® Regulator
SGND
RUN
fSET
B
GND
VFB
VOUT
1.2V
20A
330pF
100µF
6.3V
×2
+
470µF
6.3V
×2
RFB
60.4k
4637 TA01a
C
INTVCC
D
F
TEMP
EXTVCC
PGOOD
VFB
G
PGOOD
E
GND
100
J
VOSNS+
K
DIFF_OUT
L
VOUT_LCL
M
VOSNS–
LGA
PACKAGE
LGA
PACKAGE
133-LEAD (15mm × 15mm × 4.32mm)
1.2VOUT
250kHz
CCM
95
SGND
H
VOUT
12VIN Efficiency vs Load Current
90
EFFICIENCY (%)
n
85
80
75
133-LEAD (15mm × 15mm × 4.32mm)
LTM4637EV
LTM4637IV
20
70
65
0
2
4
6
8 10 12 14 16 18 20
OUTPUT CURRENT (A)
4637 TA01b
Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611, 6677210.
µModule Regulators
LTM4649
10A Step-Down DC/DC µModule Regulator
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
10A DC Output Current
Input Voltage Range: 4.5V to 16V
Output Voltage Range: 0.6V Up to 3.3V
No Heat Sink or Current Derating Up to 85°C Ambient
Temperature
±1.5% Total DC Voltage Output Error
Multiphase Operation with Current Sharing
Remote Sense Amplifier
Built-In General Use Temperature Monitor
Selectable Pulse-Skipping Mode/Burst Mode® Operation for
High Efficiency at Light Load
Soft-Start/Voltage Tracking
Protection: Output Overvoltage and Overcurrent Foldback
9mm × 15mm × 4.92mm BGA Package
The LTM®4649 is a complete 10A high efficiency switching mode
step-down DC/DC µModule® regulator in a 9mm × 15mm × 4.92
BGA package. Included in the package are the switching controller,
power FETs, inductor, and all support components. Operating
over an input voltage range of 4.5V to 16V, the LTM4649 supports
an output voltage range of 0.6V to 3.3V, set by a single external
resistor. This high efficiency design delivers 10A continuous current.
Only bulk input and output capacitors are needed.
High switching frequency and a current mode architecture enables
a very fast transient response to line and load changes without
sacrificing stability. The device supports frequency synchronization,
programmable multiphase operation, spread spectrum, output
voltage tracking for supply rail sequencing.
Fault protection features include overvoltage protection, overcurrent
protection. The LTM4649 is offered in a small thermally enhanced
9mm × 15mm × 4.92mm BGA package. The LTM4649 is RoHS
compliant.
APPLICATIONS
n
Telecom, Networking and Industrial Equipment
Point-of-Load Regulation
A
B
GND
1
CLKIN
PHMODE
MODE
VIN
F
4.5V to 16V Input, 1.5V Output DC/DC µModule Regulator
G
GND
RUN
VIN
4.5V TO 16V
CLKOUT
2
NC
FREQ
3
INTVCC
4
CLKIN
VIN
22µF
16V
×2
NC
7
SW
COMP
FB
FREQ
VOUT
INTVCC
VOUT_LCL
SW
DIFFOUT
RUN
TRACK/SS
5
TEMP 6
PGOOD
TOP VIEW
C D
E
MODE
LTM4649
TRACK/SS
DIFFN
8
DIFFP
DIFFOUT
9
VOUT_LCL
0.1µF
TEMP
GND
100µF
6.3V
×2
DIFFP
VOUT
1.5V
10A
DIFFN
PHMODE
VFB
COMP
6.65k
PGOOD
CLKOUT
4649 TA01a
10
11
GND
Efficiency and Power Loss
at 12V and 5V Input
VOUT
BGA PACKAGE
68-LEAD
15mm ×× 4.92mm)
4.92mm)
68-LEAD (9mm
(9mm ×
× 15mm
LTM4649EY
LTM4649IY
Current Derating: 12V Input,
1.5VOUT, No Heat Sink
95
3.0
12
90
2.5
10
85
2.0
80
1.5
75
1.0
70
65
VIN = 12V
VIN = 5V
0
2
4
6
LOAD CURRENT (A)
8
10
POWER LOSS (W)
EFFICIENCY (%)
n
LOAD CURRENT (A)
n
8
6
4
0.5
2
0
0
4649 TA01b
Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066 and 6580258. Other patents pending.
400LFM
200LFM
0LFM
0
40
60
80
100
20
AMBIENT TEMPERATURE (°C)
120
4649 TA01c
21
µModule Regulators
LTM8028
36VIN, UltraFast, Low Output Noise
5A µModule Regulator
FEATURES
DESCRIPTION
High Performance 5A Linear Regulator with Switching
Step-Down Converter for High Efficiency
n Digitally Programmable V
OUT: 0.8V to 1.8V
n Input Voltage Range: 6V to 36V
n Very Tight Tolerance Over Temperature, Line, Load and
Transient Response
n Low Output Noise: 40μV
RMS (10Hz to 100kHz)
n Parallel Multiple Devices for 10A or More
n Accurate Programmable Current Limit to Allow
Asymmetric Power Sharing
n Analog Output Margining: ±10% Range
n Synchronization Input
n Stable with Low ESR Ceramic Output Capacitors
n 15mm × 15mm × 4.92mm Surface Mount BGA Package
The LTM®8028 is a 36VIN, 5A µModule® regulator, consisting of
an UltraFast™ 5A linear regulator preceded by a high efficiency
switching regulator. In addition to providing tight output regulation,
the linear regulator automatically controls the output voltage of the
switcher to provide optimal efficiency and headroom for dynamic
response.
n
The output voltage is digitally selectable in 50mV increments over a
0.8V to 1.8V range. An analog margining function allows the user to
adjust system output voltage over a continuous ±10% range, and a
single-ended feedback sense line may be used to mitigate IR drops
due to parasitic resistance.
The LTM8028 is packaged in a compact (15mm × 15mm × 4.92mm)
overmolded ball grid array (BGA) package suitable for automated
assembly by standard surface mount equipment. The LTM8028 is
RoHS compliant.
APPLICATIONS
FPGA and DSP Supplies
n High Speed I/O
n ASIC and Microprocessor Supplies
n Servers and Storage Devices
n
Low Output Noise, 1.2V, 5A µModule Regulator
LTM8028
VIN
VIN
9V TO 15V
150k
RUN
MARGA
IMAX
10µF
0.01µF
BKV
SS
82.5k
VOUT
1.2V
5A
VOUT
LINEAR
REGULATOR SENSEP
PGOOD
RT
SYNC
GND
VOB VO0 VO1 VO2
137µF
+
f = 500kHz
100µF
470µF
8028 TA01a
TOP VIEW
11
BANK 1
10
SENSEP
TEST
PGOOD
VO1
VOB
MARGA
VO0
VO2
BANK 2
VOUT
VOUT
20mV/DIV
BKV
9
8
7
BANK 3
6
IOUT
2A/DIV
∆IOUT = 0.5A TO 5A
1µs RISE/FALL TIME
GND
5
10µs/DIV
4
3
2
SS SYNC
1
BANK 4
VIN
IMAX RT RUN
A
B
C
D
E
F
G
H
J
K
BGA PACKAGE
114 PADS (15mm × 15mm × 4.92mm)
LTM8028EY
LTM8028IY
LTM8028MPY
22
FULL LOAD
NOISE AND RIPPLE
500µV/DIV
L
1µs/DIV
MEASURED PER AN70, 150MHz BW
8028 TA01b
PMIC
LTC3676/LTC3676-1
Power Management Solution for
Application Processor
The LTC3676 supports i.MX, PXA and OMAP processors with
eight independent rails at appropriate power levels. Other features
include interface signals such as the VSTB pin that toggles between
programmed run and standby output voltages on up to four rails
simultaneously. The device is available in a 40-lead 6mm × 6mm
QFN package.
APPLICATIONS
Start-Up Sequence
VIN
2.7V TO 5.5V
WAKE
LDO2
3676 TA01a
TO µPROCESSOR
SW2
40 39 38 37 36 35 34 33 32 31
FB_L2 1
30 EN_L2
FB_L2 1
30 EN_L2
VIN_L2 2
29 ON
VIN_L2 2
29 ON
LDO2 3
28 LDO1
LDO2 3
LDO3 4
27 VIN
LDO3 4
VIN_L3 5
28 LDO1
27 VIN
26 FB_L1
VIN_L3 5
25 FB_B2
LDO4 6
VIN_L4 7
24 FB_B1
VIN_L4 7
24 FB_B1
FB_L4 8
23 FB_B4
VDDQIN 8
23 FB_B4
EN_L4 9
22 FB_B3
VTTR 9
EN_L3 10
21 PWR_ON
41
GND
LDO4 6
11 12 13 14 15 16 17 18 19 20
UJ PACKAGE
UJ
PACKAGE
40-LEAD (6mm × 6mm) PLASTIC QFN
40-LEAD (6mm × 6mm) PLASTIC QFN
LTC3676EUJ
LTC3676IUJ
LTC3676HUJ
26 FB_L1
41
GND
25 FB_B2
22 FB_B3
EN_L3 10
21 PWR_ON
11 12 13 14 15 16 17 18 19 20
SW3
2
40 39 38 37 36 35 34 33 32 31
IRQ
1/2 VDDQ
TOP VIEW
WAKE
ENABLES VTTR
PWR_ON WAKE
ON
PGOOD
I 2C
GND
TOP VIEW
VSTB
4
EN_B2
SW1
3676 TA01b
EN_B3
LDO4
1µF
1ms/DIV
PVIN2
VTT
1/2 VDDQ
22µF 1.5A
EN_B4
1.5µH
1µF
PVIN1
DDR VDDQ
1.5V
22µF 2.5A
LDO4
PVIN3
SW4
BUCK4
EN_B1
LDO3
1.5µH
LDO3
BUCK3
PVIN4
1µF
BUCK1 BUCK2
RSTO
VSOC
0.9V TO 1.5V
22µF 1.5A
SCL
1.5µH
PGOOD
SW2
1V/DIV
SDA
LDO2
VARM
0.9V TO 1.5V
22µF 2.5A
SW1
LTC3676-1
1.5µH
SW4
3V
300mA
SW3
DVDD
1.8V
300mA
1µF
VIN
SW2
1.2V
300mA
LDO1
IRQ
VRTC
1.2V
25mA
SW3
n
WAKE
n
VSTB
n
EN_B2
n
SW1
n
Supports Freescale i.MX6, ARM Cortex, and Other
Application Processors
Handheld Instruments and Scanners
Portable Industrial and Medical Devices
Automotive Infotainment
High End Consumer Devices
Multirail Systems
SW4
n
EN_B3
n
PVIN2
n
Regulator start-up is sequenced by connecting outputs to enable
pins in the desired order or via the I2C port. System power-on,
power-off and reset functions are controlled by pushbutton
interface, pin inputs, or I2C.
EN_B4
n
PVIN1
n
PVIN3
n
EN_B1
n
PVIN4
n
RSTO
n
SCL
n
The LTC®3676 is a complete power management solution for
advanced portable application processor-based systems. The
device contains four synchronous step-down DC/DC converters for
core, memory, I/O, and system on-chip (SoC) rails and three 300mA
LDO regulators for low noise analog supplies. The LTC3676-1 has a
±1.5A buck regulator configured to support DDR termination plus a
VTTR reference output. An I2C serial port is used to control regulator
enables, power-down sequencing, output voltage levels, dynamic
voltage scaling, operating modes and status reporting.
PGOOD
n
DESCRIPTION
SDA
n
FEATURES
Quad I2C Adjustable High Efficiency Step Down
DC/DC Converters: 2.5A, 2.5A, 1.5A, 1.5A
Three 300mA LDO Regulators (Two Adjustable)
DDR Power Solution with VTT and VTTR Reference
Pushbutton ON/OFF Control with System Reset
Independent Enable Pin-Strap or I2C Sequencing
Programmable Autonomous Power-Down Control
Dynamic Voltage Scaling
Power Good and Reset Functions
Selectable 2.25MHz or 1.12MHz Switching Frequency
Always Alive 25mA LDO Regulator
12µA Standby Current
Low Profile 40-Lead 6mm × 6mm × 0.75mm QFN Package
DVDD
n
UJ PACKAGE
UJ
PACKAGE
40-LEAD (6mm × 6mm) PLASTIC QFN
40-LEAD (6mm × 6mm) PLASTIC QFN
LTC3676EUJ-1
LTC3676IUJ-1
LTC3676HUJ-1
23
Power System Management
LTC2978A
8-Channel PMBus Power System Manager
Featuring Accurate Output Voltage Measurement
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Sequence, Trim, Margin and Supervise Eight Power Supplies
Manage Faults, Monitor Telemetry and Create Fault Logs
PMBus Compliant Command Set
Supported by LTpowerPlay™ GUI
Margin or Trim Supplies to 0.25% Accuracy
Fast OV/UV Supervisors per Channel
Coordinate Sequencing and Fault Management Across
Multiple Chips
Automatic Fault Logging to Internal EEPROM
Operate Autonomously without Additional Software
Internal Temperature and Input Voltage Supervisors
Accurate Monitoring of Eight Output Voltages, Input Voltage and
Internal Die Temperature
I2C/SMBus Serial Interface
Can Be Powered from 3.3V, or 4.5V to 15V
Programmable Watchdog Timer
100% Compatible with the LTC2978
Available in 64-Pin 9mm × 9mm QFN Package
The LTC®2978A is an 8-channel Power System Manager used to
sequence, trim (servo), margin, supervise, manage faults, provide
telemetry and create fault logs. PMBus commands support power
supply sequencing, precision point-of-load voltage adjustment and
margining. DACs use a proprietary soft-connect algorithm to minimize
supply disturbances. Supervisory functions include overvoltage and
undervoltage threshold limits for eight power supply output channels
and one power supply input channel, as well as overtemperature
and undertemperature limits. Programmable fault responses can
disable the power supplies with optional retry after a fault is detected.
Faults that disable a power supply can automatically trigger black
box EEPROM storage of fault status and associated telemetry. An
internal 16-bit ADC monitors eight output voltages, one input voltage,
and die temperature. In addition, odd numbered channels can be
configured to measure the voltage across a current sense resistor. A
programmable watchdog timer monitors microprocessor activity for a
stalled condition and resets the microprocessor if necessary. A single
wire bus synchronizes power supplies across multiple LTC power
system management devices. Configuration EEPROM supports
autonomous operation without additional software.
APPLICATIONS
n
n
n
Computers and Network Servers
Industrial Test and Measurement
High Reliability Systems
Medical Imaging
Video
8-Channel PMBus Power System Manager
3.3V**
TO INTERMEDIATE
BUS CONVERTER ENABLE
TOP VIEW
VSENSEM6 1
VSENSEP7 2
VSENSEM7 3
VOUT_EN0 4
VOUT_EN1 5
VOUT_EN2 6
VOUT_EN3 7
VOUT_EN4 8
VOUT_EN5 9
VOUT_EN6 10
VOUT_EN7 11
VIN_EN 12
DNC 13
VIN_SNS 14
VPWR 15
VDD33 16
65
GND
VIN
4.5V < VIBUS < 15V**
VPWR
VIN_SNS
VDD33
VDACP0
PMBus
INTERFACE
48 VSENSEP3
47 VSENSEM2
46 VSENSEP2
45 VDACM2
44 VDACP2
43 VSENSEM1
42 VSENSEP1
41 VDACM1
40 VDACP1
39 VDACP0
38 VDACM0
37 VSENSEM0
36 VSENSEP0
35 REFM
34 REFP
33 ASEL1
WRITE-PROTECT
UP PACKAGE
64-LEAD (9mm × 9mm) PLASTIC QFN
LTC2978ACUP
LTC2978AIUP
LTC2978A*
SCL
R30
R20
VDACM0
DIGITALLY
MANAGED
POWER
SUPPLY
VFB
LOAD
R10
ALERTB
VSENSEM0
SGND
CONTROL0
VOUT_EN0
RUN/SS
GND
WP
PWRGD
WDI/RESETB
TO/FROM OTHER
LTC2978s
VOUT
VSENSEP0
VIN_EN
SDA
64 VSENSEP6
63 VSENSEM5
62 VSENSEP5
61 VDACM7
60 VDACP7
59 VDACP6
58 VDACM6
57 VDACM5
56 VDACP5
55 VDACP4
54 VDACM4
53 VSENSEM4
52 VSENSEP4
51 VDACM3
50 VDACP3
49 VSENSEM3
n
FAULTB00
ASEL0
SHARE_CLK
ASEL1
GND
2978a TA01a
TO µP RESETB INPUT
WATCHDOG
TIMER INTERRUPT
*SOME DETAILS OMITTED FOR CLARITY
ONLY ONE OF EIGHT CHANNELS SHOWN
**LTC2978A MAY BE POWERED FROM EITHER AN
EXTERNAL 3.3V SUPPLY OR THE INTERMEDIATE BUS
Typical ADC Total Unadjusted Error vs Temperature
0.035
VDD33 17
VDD25 18
WP 19
PWRGD 20
SHARE_CLK 21
WDI/RESETB 22
FAULTB00 23
FAULTB01 24
FAULTB10 25
FAULTB11 26
SDA 27
SCL 28
ALERTB 29
CONTROL0 30
CONTROL1 31
ASEL0 32
n
ADC VIN = 1.8V
0.030
0.025
ERROR (%)
n
0.020
0.015
0.010
0.005
0
–50 –35 –20 –5 10 25 40 55 70 85 100
2978a TA01b
TEMPERATURE (°C)
24
Protected by U.S. Patents, including 7382303, 7420359 and 7940091.
Switching Regulators—Monolithic
LTC3374
8-Channel Parallelable 1A Buck DC/DCs
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
8-Channel Independent Step-Down DC/DCs
Master-Slave Configurable for Up to 4A per Output Rail
with a Single Inductor
Independent VIN Supplies for Each DC/DC
(2.25V to 5.5V)
All DC/DCs Have 0.8V to VIN Output Range
Precision Enable Pin Thresholds for Autonomous
Sequencing
1MHz to 3MHz Programmable/Synchronizable Oscillator
Frequency (2MHz Default)
Die Temperature Monitor Output
Thermally Enhanced 38-Lead QFN (5mm × 7mm) and
TSSOP Packages
The LTC®3374 is a high efficiency multioutput power supply IC. The
DC/DCs consist of eight synchronous buck converters (1A each) all
powered from independent 2.25V to 5.5V input supplies.
The DC/DCs may be used independently or in parallel to achieve
higher currents of up to 4A per output with a shared inductor. The
common buck switching frequency may be programmed with an
external resistor, synchronized to an external oscillator, or set to a
default internal 2MHz clock.The operating mode for all DC/DCs may
be programmed via the MODE pin.
To reduce input noise the buck converters are phased in 90°
steps. Precision enable pin thresholds provide reliable power-up
sequencing. The LTC3374 is available in a compact 38-lead 5mm ×
7mm QFN package as well as a 38-lead TSSOP package.
APPLICATIONS
VIN1
BUCK1
VCC
2.7V TO 5.5V
LTC3374
TOP VIEW
EN8
EN7
MODE
VCC
TEMP
EN2
EN1
TOP VIEW
38 37 36 35 34 33 32
TEMP
1
38 VCC
EN2
2
37 MODE
EN1
3
36 EN7
FB1
4
35 EN8
VIN1
5
34 FB8
SW1
6
33 VIN8
SW2
7
32 SW8
28 SW7
VIN2
8
31 SW7
27 VIN7
FB2
9
26 FB7
FB3 10
25 FB6
VIN3 11
VIN3 8
24 VIN6
SW3 12
27 VIN6
SW3 9
23 SW6
SW4 13
26 SW6
SW4 10
22 SW5
VIN4 14
25 SW5
VIN4 11
21 VIN5
20 FB5
FB1 1
31 FB8
VIN1 2
30 VIN8
SW1 3
29 SW8
SW2 4
VIN2 5
FB2 6
39
GND
FB3 7
FB4 12
EN5
EN6
RT
SYNC
PGOOD_ALL
13 14 15 16 17 18 19
EN3
n
8-Channel 1A Multioutput Buck Regulator
General Purpose Multichannel Power Supplies
Industrial/Automotive/Communications
EN4
n
UHF PACKAGE
PACKAGE
UHF
38-LEAD (5mm × 7mm) PLASTIC QFN
VIN2
BUCK2
30 VIN7
39
GND
29 FB7
28 FB6
FB4 15
24 VIN5
EN4 16
23 FB5
EN3 17
22 EN5
PGOOD_ALL 18
21 EN6
SYNC 19
LTC3374EUHF
LTC3374IUHF
LTC3374HUHF
LTC3374EFE
LTC3374IFE
LTC3374HFE
SLAVE
0.8V TO VIN2
UP TO 1A
0.8V TO VIN7
UP TO 1A
0.8V TO VIN8
UP TO 1A
3374 TA01a
Buck Efficiency vs ILOAD
100
90
FE PACKAGE
FE PACKAGE
38-LEAD
PLASTIC TSSOP
38-LEAD PLASTIC TSSOP
MASTER
SYNC RT
20 RT
38-LEAD (5mm × 7mm) PLASTIC QFN
0.8V TO VIN1
UP TO 1A
EN1
MASTER
EN2
•
EN3
•
EN4
•
V
SLAVE
IN7
EN5
BUCK7
EN6
EN7
EN8
MASTER
PGOOD_ALL
TEMP
MODE
VIN8
SLAVE
BUCK8
80
EFFICIENCY (%)
n
70
60
50
SINGLE BUCK
DUAL BUCK
TRIPLE BUCK
QUAD BUCK
FORCED CONTINUOUS MODE
VIN = 3.3V, VOUT = 1.8V
fOSC = 1MHz, L = 3.3µH
40
30
20
10
0
0
2000
1000
3000
LOAD CURRENT (mA)
4000
3374 TA01b
25
Switching Regulators—Monolithic
LT3574
Isolated Flyback Converter
without an Opto-Coupler
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
3V to 40V Input Voltage Range
0.65A, 60V Integrated NPN Power Switch
Boundary Mode Operation
No Transformer Third Winding or Opto-Isolator Required
for Regulation
Improved Primary-Side Winding Feedback Load
Regulation
VOUT Set with Two External Resistors
BIAS Pin for Internal Bias Supply and Power NPN Driver
Programmable Soft-Start
Programmable Power Switch Current Limit
16-Lead MSOP Package
The LT®3574 is a monolithic switching regulator specifically
designed for the isolated flyback topology. No third winding or
opto-isolator is required for regulation. The part senses the isolated
output voltage directly from the primary side flyback waveform. A
0.65A, 60V NPN power switch is integrated along with all control
logic into a 16-lead MSOP package.
The LT3574 operates with input supply voltages from 3V to 40V, and
can deliver output power up to 3W with no external power switch.
The LT3574 utilizes boundary mode operation to provide a small
magnetic solution with improved load regulation.
The output voltage is easily set with two external resistors and the
transformer turns ratio. Off-the-shelf transformers are available for
many applications.
APPLICATIONS
n
Industrial, Automotive and Medical Isolated
Power Supplies
5V Isolated Flyback Converter
VIN
12V TO 24V
B340A
10µF
357k
0.22µF
VIN
3:1
2k
50µH
SHDN/UVLO
LT3574
•
5.6µH
•
PMEG6010
51.1k
VOUT–
80.6k
RFB
VOUT+
5V
0.35A
22µF
RREF
TC
6.04k
RILIM
SS
SW
VC
28.7k
GND
TEST BIAS
59k
10k
4.7µF
1nF
10nF
3574 TA01
Load Regulation
1.0
TOP VIEW
GND
TEST
GND
SW
VIN
BIAS
SHDN/UVLO
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
MSPACKAGE
PACKAGE
MS
16-LEADPLASTIC
PLASTICMSOP
MSOP
16-LEAD
LT3574EMS
LT3574IMS
GND
TC
RREF
RFB
VC
RILIM
SS
GND
OUTPUT VOLTAGE ERROR (%)
n
VIN = 12V
0
–0.5
–1.0
26
VIN = 24V
0.5
0
100
200
300 400
IOUT (mA)
500
600
700
3574 TA01b
Switching Regulators—Monolithic
LTC3607
Dual 600mA 15V Monolithic Synchronous
Step-Down DC/DC Regulator
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
High Efficiency: Up to 96%
Very Low Quiescent Current: 55µA Total
2.25MHz Constant Frequency Operation
Low Dropout Operation: 100% Duty Cycle
Low Ripple <30mVP-P Burst Mode® Operation
Peak Current-Mode Control Architecture for Excellent Line
and Load Transient Response
Wide Voltage Input Range 4.5V to 15V
600mA/Channel Rated Output Current
0.6V Reference Allows Low Output Voltages
±1.5% Output Voltage Accuracy
Ultralow Shutdown Current: IQ < 1µA
Internal Compensation
Power Good Outputs
Externally Frequency Synchronization (1MHz to 4MHz)
Independent Internal Soft-Start for Each Channel
Small 16-Lead Thermally Enhanced Thin QFN (3mm × 3mm)
and MSE Packages
The LTC®3607 is a 15V dual 600mA monolithic synchronous stepdown regulator which has only 55µA quiescent current. Intended for
a variety of applications, including dual lithium-ion battery products,
it operates from a wide 4.5V to 15V input voltage range. It features
a constant 2.25MHz switching frequency, enabling the use of tiny,
low cost capacitors and inductors 1mm or less in height. Each
output voltage is adjustable from 0.6V to VIN. Internal synchronous
power switches provide high efficiency without the need for external
Schottky diodes.
A user selectable mode input is provided to allow the user to trade
off ripple noise for light load efficiency; Burst Mode operation
provides the highest efficiency at light loads, while pulse-skipping
mode provides the lowest ripple noise.
To further maximize battery run time, the P-channel MOSFETs are
turned on continuously in dropout (100% duty cycle). In shutdown,
the device draws <1µA.
APPLICATIONS
VIN 12V
10µF
×2
VIN
RUN2
RUN1
4.7µH
VOUT1
5V AT 600mA
SW1
LTC3607
SW2
4.7µH
22pF
VOUT2
3.3V AT 600mA
22pF
887k
VFB2
VFB1
10µF
GND
121k
549k
121k
10µF
3607 TA01a
Efficiency and Power Loss vs Load Current
100
RUN2
16 15 14 13
PGOOD1 2
11 PGOOD2
17
PGND
SVIN 3
10 SGND
PGND1 4
9
7
8
SW2
6
PVIN2
5
PGND2
UD PACKAGE
PACKAGE
UD
16-LEAD (3mm × 3mm) PLASTIC QFN
16-LEAD (3mm × 3mm) PLASTIC QFN
LTC3607EUD
LTC3607IUD
1
2
3
4
5
6
7
8
80
17
PGND
16
15
14
13
12
11
10
9
MSE
MSE PACKAGE
PACKAGE
16-LEAD PLASTIC MSOP
16-LEAD PLASTIC MSOP
LTC3607EMSE
LTC3607IMSE
Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611.
PGOOD1
MODE/SYNC
RUN1
VFB1
VFB2
RUN2
SGND
PGOOD2
70
0.1
60
50
40
0.01
30
POWER LOSS (W)
12 SGND
MODE/SYNC 1
SVIN
PGND1
SW1
PVIN1
PVIN2
SW2
PGND2
SGND
1
VIN = 12V
90
TOP VIEW
EFFICIENCY (%)
VFB2
VFB1
TOP VIEW
RUN1
n
Dual Lithium-Ion Battery Supplies
Automotive Applications
Servers
SW1
n
PVIN1
n
20
VOUT = 5V
VOUT = 3.3V
10
0
1
10
100
LOAD CURRENT (mA)
0.001
1000
3607 TA01b
27
Switching Regulators—Monolithic
LTC3630A
High Efficiency, 76V 500mA Synchronous
Step-Down Converter
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Wide Operating Input Voltage Range: 4V to 76V
Synchronous Operation for Highest Efficiency
Internal High Side and Low Side Power MOSFETs
No Compensation Required
Adjustable 50mA to 500mA Maximum Output Current
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 12µA
Wide Output Range: 0.8V to VIN
0.8V ±1% Feedback Voltage Reference
Precise RUN Pin Threshold
Internal and External Soft-Start
Programmable 1.8V, 3.3V, 5V or Adjustable Output
Few External Components Required
Low Profile (0.75mm) 3mm × 5mm DFN and
Thermally Enhanced MSE16 Packages
The LTC®3630A is a high efficiency step-down DC/DC converter
with internal high side and synchronous power switches that draws
only 12μA typical DC supply current while maintaining a regulated
output voltage at no load.
n
n
n
n
Industrial Control Supplies
Medical Devices
Portable Instruments
Automotive
Avionics
PARAMETER
TOP VIEW
SW 1
16 GND
VIN 3
14 GND
17
GND
RUN 5
VPRG2 6
VPRG1 7
GND 8
With its wide input range of 4V to 76V, the LTC3630A is a robust
converter suited for regulating a wide variety of power sources. A
feedback comparator output enables multiple LTC3630As to be
paralleled in higher current applications.
The LTC3630A is available in the thermally enhanced
3mm × 5mm DFN and the MSE16 packages.
APPLICATIONS
n
The LTC3630A can supply up to 500mA load current and features
a programmable peak current limit that provides a simple method
for optimizing efficiency and for reducing output ripple and
component size. The LTC3630A’s combination of Burst Mode®
operation, integrated power switches, low quiescent current, and
programmable peak current limit provides high efficiency over a
broad range of load currents.
12
11
10
9
FBO
ISET
SS
VFB
LTC3630A
LTC3630
Maximum Operating VIN
76V
65V
Absolute Maximum VIN
80V
70V
12.5V to 76V Input to 12V Output, 500mA Step-Down Converter
22µH
VIN
12.5V TO 76V
VIN
2.2µF
1
16 GND
NC
2
15 NC
VIN
3
NC
4
RUN
5
VPRG2
6
11 ISET
VPRG1
7
10 SS
GND
8
9
VFB
PACKAGE
DHC PACKAGE
16-LEAD (5mm
(5mm ×× 3mm)
3mm) PLASTIC
PLASTIC DFN
DFN
16-LEAD
(NOTE 6)
LTC3630AEDHC
LTC3630AIDHC
LTC3630AHDHC
LTC3630AMPDHC
28
147k
3630a TA01a
Efficiency and Power Loss vs Load Current
100
90
VOUT = 12V
80
13 NC
12 FBO
SS
VPRG1
VPRG2
GND
14 GND
17
GND
VFB
EFFICIENCY
70
1000
60
50
40
100
POWER LOSS
10
30
20
VIN = 24V 1
VIN = 76V
10
0
0.1
1
10
100
LOAD CURRENT (mA)
1000
3630a TA01b
POWER LOSS (mW)
SW
22µF
200k
LTC3630A
ISET
FBO
OVLO
MSE PACKAGE
VARIATION:
MSE16 (12)
VARIATION: MSE16
(12) 16-LEAD
PLASTIC MSOP
16-LEAD PLASTIC MSOP
LTC3630AEMSE
LTC3630AIMSE
LTC3630AHMSE
LTC3630AMPMSE
TOP VIEW
SW
RUN
EFFICIENCY (%)
n
VOUT
12V
500mA
Switching Regulators—Monolithic
LT3995
60V, 3A, 2MHz Step-Down Switching
Regulator with 2.7µA Quiescent Current
n
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Ultralow Quiescent Current:
2.7µA IQ at 12VIN to 3.3VOUT
Low Ripple Burst Mode® Operation
Output Ripple < 15mVP-P
Wide Input Range: Operation from 4.3V to 60V
3A Maximum Output Current
Excellent Start-Up and Dropout Performance
Adjustable Switching Frequency: 200kHz to 2MHz
Synchronizable Between 250kHz to 2MHz
Accurate Programmable Undervoltage Lockout
Low Shutdown Current: IQ = 700nA
Power Good Flag
Soft-Start Capability
Thermal Shutdown Protection
Current Limit Foldback with SS Override
Saturating Switch Design: 85mΩ On Resistance
Small, Thermally Enhanced 16-Lead MSOP Package
The LT®3995 is an adjustable frequency monolithic buck switching
regulator that accepts a wide input voltage range up to 60V. Low
quiescent current design consumes only 2.7µA of supply current
while regulating with no load. Low ripple Burst Mode operation
maintains high efficiency at low output currents while keeping the
output ripple below 15mV in a typical application. The LT3995 can
supply up to 3A of load current and has current limit foldback to
limit power dissipation during short-circuit. A low dropout voltage
of 500mV is maintained when the input voltage drops below the
programmed output voltage, such as during automotive cold crank.
An internally compensated current mode topology is used for
fast transient response and good loop stability. A high efficiency
85mΩ switch is included on the die along with a boost Schottky
diode and the necessary oscillator, control, and logic circuitry. An
accurate 1.02V threshold enable pin can be driven directly from a
microcontroller or used as a programmable undervoltage lockout.
A capacitor on the SS pin provides a controlled inrush current (softstart). A power good flag signals when VOUT reaches 91.6% of the
programmed output voltage. The LT3995 is available in a small 16lead MSOP package with exposed pad for low thermal resistance.
APPLICATIONS
n
n
n
Automotive Battery Regulation
Portable Products
Industrial Supplies
3.3V Step-Down Converter
VIN
4.3V TO 60V
VIN
OFF ON
EN
BOOST
PG
SW
10µF
10nF
PDS560
LT3995
SS
RT
SYNC
182k
0.47µF 8.2µH
OUT
VOUT
3.3V
3A
47µF
1210
×2
1M
FB
GND
10pF
576k
3995 TA01a
f = 300kHz
No-Load Supply Current
4.5
TOP VIEW
FB
SS
OUT
BOOST
SW
SW
SW
NC
1
2
3
4
5
6
7
8
17
GND
16
15
14
13
12
11
10
9
MSE
MSE PACKAGE
PACKAGE
16-LEAD PLASTIC
PLASTIC MSOP
MSOP
16-LEAD
LT3995EMSE
LT3995IMSE
LT3995HMSE
SYNC
PG
RT
EN
VIN
VIN
VIN
NC
IN REGULATION
4.0
INPUT CURRENT (µA)
n
3.5
3.0
2.5
2.0
1.5
1.0
0
5 10 15 20 25 30 35 40 45 50 55 60
INPUT VOLTAGE (V)
3995 TA01b
29
Switching Regulators—Monolithic
LT8697
USB 5V 2.5A Output, 42V Input Synchronous
Buck with Cable Drop Compensation
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Wide Input Range: 5V to 42V
Low Dropout Under All Conditions: 450mV at 2.1A
Accurate 5V Output: ±1.3% Over Full Temperature Range
Programmable Cable Drop Compensation
Programmable Output Current Limit
Output Current Monitor
Dual Input Feedback Permits Regulation on Output of
USB Switch
Forced Continuous Mode for Fast Load Step Response
High Efficiency Synchronous Operation at 2MHz:
93% Efficiency at 2.1A, 5VOUT from 12VIN
95% Efficiency at 0.9A, 5VOUT from 12VIN
Fast Minimum Switch-On Time: 70ns
Adjustable Output from 5.0V to 5.25V
Adjustable and Synchronizable: 300kHz to 2.2MHz
Small Thermally Enhanced 3mm × 5mm 24-Lead QFN Package
The LT®8697 is a compact, high efficiency, high speed synchronous
monolithic step-down switching regulator designed to power 5V
USB applications. A precise output voltage and programmable
cable drop compensation maintain accurate 5V regulation at the
USB socket at the end of a long cable. Forced continuous operation
allows the LT8697 to sink current, further enhancing accurate 5V
regulation during load transients.
Accurate and programmable output current limit, a power good
indicator pin and an output current monitor pin improve system
reliability and safety, allow the user to implement latch-off or autoretry functionality and can eliminate the need for a USB switch IC.
Dual feedback allows regulation on the output of a USB switch
and limits cable drop compensation to a maximum of 5.8V output,
protecting USB devices during fault conditions. Thermal shutdown
provides additional protection by limiting power dissipation in the IC
during an overtemperature fault. The LT8697 is available in a small
24-lead 3mm × 5mm package with an exposed pad for low thermal
resistance.
APPLICATIONS
2MHz 5V Step-Down Converter with Cable Drop Compensation
VIN
6V TO 42V
0.1µF
4.7µF
VIN
VOUT
BST
3.3µH
EN/UV
INTVCC
1µF
10nF
16.5k
SYS
ICTRL
ISN
TR/SS
USB5V
RT
47µF
×2
1nF
+
10k
ISP
SYNC
0.1Ω
0.018Ω
SW
LT8697
3 METERS AWG 20
TWISTED PAIR CABLE
LOAD
PG
GND
PGND
18.2k
0.1Ω
ISP
ISN
RCBL
ICTRL
8697 TA01a
Transient Response Through 3 Meters AWG 20 Twisted-Pair Cable
24 23 22 21
SYNC 1
20 USB5V
TR/SS 2
19 PG
RT 3
5.50
5
18 SYS
EN/UV 4
16 BST
15 SW
14 SW
PGND 8
13 SW
UDD
UDDPACKAGE
PACKAGE
24-LEAD(3mm
(3mm××5mm)
5mm) PLASTIC
PLASTIC QFN
24-LEAD
QFN
LT8697EUDD
LT8697IUDD
3
VLOAD
4.75
NC
9 10 11 12
5.00
4
VOUT
4.50
4.25
2
ILOAD
50mA/µs
100µs/DIV
1
0
8697 TA01b
CURRENT (A)
VIN 6
PGND 7
NC
5.25
17 INTVCC
25
GND
VIN 5
30
VLOAD
5V, 2.4A
–
RCBL
TOP VIEW
NC
n
Automotive and Industrial USB
Precision 5V Supply
NC
n
VOLTAGE (V)
n
80V Sync Buck-Boost
Variable Input
2.8V to 80V
Up to 250W
IIN SET
Input Current:
Regulate or
Monitor
CSN
CSP
BG2
TG1
CSPIN
VIN SET
Fixed Output
1.3V to 80V
Output Current:
Regulate or
Monitor
BG1
CSNIN
IOUT SET
TG2
LT8705
CSPOUT
CSNOUT
FBIN
FBOUT
GND
VOUT SET
Four Regulation Loops (VOUT, I OUT, VIN and IIN)
®
The LT 8705 is the latest in our growing family of single inductor buck-boost controllers. This wide input voltage
range, high power controller is capable of delivering efficiencies up to 98.5% for a 48V, 5A output from an input voltage
range of 2.8V to 80V. Using a single inductor and 4 external MOSFETs, the LT8705 can deliver output power up to 250W.
Input or output voltage or current, any of these can be regulated with the devices’ 4 control loops. Its input regulation
loop is ideal for high impedance sources such as solar panels.
Features
36V to 80V Input; 48V, 5A Output
100
• Single Inductor
• VOUT Range: 1.3V to 80V
• VOUT, IOUT, VIN, IIN Feedback Loops
• Current Monitors
• Synchronous Rectification
• Quad N-Channel MOSFET Gate Drivers
• Solar-Powered Battery Charger Capable
1-800-4-LINEAR
98.0
97.0
Efficiency (%)
• VIN Range: 2.8V to 80V
www.linear.com/product/LT8705
99.0
• Very High Efficiency
Info & Free Samples
96.0
95.0
94.0
93.0
VIN = 36V
92.0
VIN = 48V
91.0
VIN = 80V
90.0
0.5 1.00
2.00
3.00
4.00
Load Current (A)
video.linear.com/138
5.00
, LT, LTC, LTM, Linear Technology and the Linear logo are
registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
Switching Regulators—Controller
LTC3774
Dual, Multiphase Current Mode Synchronous
Controller for Sub-Milliohm DCR Sensing
n
n
n
n
n
n
n
n
n
n
n
n
n
FEATURES
DESCRIPTION
Sub-Milliohm DCR Current Sensing
Operates with Power Blocks, DRMOS or External Gate Drivers
and MOSFETs
Supports Phase Shedding and N+1 Phase Redundancy
Programmable DCR Temperature Compensation
±0.75% Maximum Total DC Output Error
Dual Differential Remote Output Voltage Sense Amplifiers
Phase-Lockable Fixed Frequency Range: 200kHz to 1.2MHz
VIN Range: 4.5V to 38V
VOUT Range: 0.6V to 3.5V
Supports Smooth Start-Up into Prebiased Outputs
Programmable Soft-Start or VOUT Tracking
Hiccup Mode/Soft Recovery from Output Overcurrent
36-Lead (5mm × 6mm) QFN Package
The LTC®3774 is a dual PolyPhase® current mode synchronous
step-down switching regulator controller that drives power blocks,
DRMOS or external gate drivers and FETs. It offers a Linear
Technology proprietary technique that enhances the signal-to-noise
ratio of the current sense signal, allowing the use of inductors with
very low DC winding resistances as the current sense element for
maximum efficiency and reduced jitter.
APPLICATIONS
The LTC3774 is available in a 36-lead (5mm × 6mm) QFN package.
High Efficiency Dual Phase 1.5V/60A Step-Down Converter
ILIM1
PHSMD
FREQ
MODE/PLLIN
CLKOUT
INTVCC
VIN
TOP VIEW
ITEMP2 1
28 ITEMP1
ITH2 2
0.33µH
(0.32mΩ DCR)
27 ITH1
VOSNS2– 3
26 VOSNS1–
VOSNS2+ 4
25 VOSNS1+
TK/SS2 5
DRMOS
24 TK/SS1
37
GND
HIZB2 6
22 PWMEN1
PWM2 8
21 PWM1
RUN2 9
20 RUN1
SNSD1+
SNS1–
SNSA1+
PGOOD1
11 12 13 14 15 16 17 18
PGOOD2
PWM1
PWMEN1
SNSPAC1
SNSN1
SNSPDC1
15k
19 GND
GND 10
LTC3774
VOSNSN1
23 HIZB1
PWMEN2 7
VIN
RUN1, 2
ILIM
HI2B1
HI2B2
36 35 34 33 32 31 30 29
SNSA2+
n
ILIM2
n
SNS2–
n
Computer Systems
Telecom and Datacom Systems
Industrial Equipment
DC Power Distribution Systems
SNSD2+
n
The maximum current sense voltage is programmable from 10mV
to 30mV. High speed low offset remote sense differential amplifiers
and a precise 0.6V reference provide accurate output voltages
between 0.6V and 3.5V from a wide 4.5V to 38V input supply range.
Soft recovery from output shorts or overcurrent minimizes output
overshoot. Burst Mode® operation, continuous and pulse-skipping
modes are supported. The constant operating frequency can be
synchronized to an external clock or linearly programmed from
200kHz to 1.2MHz. Up to six LTC3774 controllers can be paralleled
for 1-, 2-, 3-, 4-, 6-, 8- or 12-phase operation.
300µF
4V
+
10k
2200pF
15k
VOSNSP1
ITH1
TK/SS1
PHASMD
CLKOUT
PGOOD1,2
PLLIN
PWM2
PWMEN2
SGND
VOSNSN2
22µF
50V
fIN
500kHz
0.33µH
(0.32mΩ DCR)
DRMOS
SNSPAC2
SNSN2
SNSPDC2
FREQ
VOSNSP2
ITH2
TK/SS2 INTVCC
0.1µF
4.7µF
VIN
4.5V TO 20V
VOUT
1.5V
60A
330µF
4V
37.5k
+
UHEPACKAGE
PACKAGE
UHE
36-LEAD (5mm × 6mm) PLASTIC QFN
36-LEAD (5mm × 6mm) PLASTIC QFN
LTC3774EUHE
LTC3774IUHE
32
3774 TA01a
Protected by U.S. Patents, including 5481178, 5705919, 5929620, 6177787, 6580258, 6498466, 6611131, patent pending.
1µA IQ Synchronous Boost Converter Extends Battery Life in
Portable Devices
Design Note 516
Goran Perica
The 12V output converter shown in Figure 1 is designed
to run from any typical small battery power source. This
design centers around the LTC®3122 boost converter,
which can efficiently generate a regulated output up
to 15V from a 1.8V to 5.5V input. The LTC3122 includes a 2.5A internal switch current limit and a full
complement of features to handle demanding boost
applications, including switching frequency programming, undervoltage lockout, Burst Mode® operation or
continuous switching mode, and true output disconnect.
The integrated synchronous rectifier is turned off when
the inductor current approaches zero, preventing reverse
inductor current and minimizing power loss at light loads.
This unique output disconnect feature is especially
important in applications that have long periods of idle
time. While idling, the part can be shut down, leaving
the output capacitor fully charged and standing by for
quick turn-on. In shutdown, the part draws less than
1µA from the input source.
VIN
1.8V to
5.5V
4.7µH
XAL4030-472
CIN
10µF
U1
LTC3122
CAP
SW
0.1µF
VOUT
PGND
CVCC
4.7µ
PWM/SYNC
SD
VCC
FB
RT
VC
RT
57.6k
COUT
0.1µF
CAP
VIN
PGND
VIN
VOUT
12V
R1
1.02M
RC
R2
86.6k 113k
CC
330p
dn4gp F01
Figure 1. The 1MHz Operating Frequency and Small
Inductor Make This Converter Suitable for Demanding Portable Battery-Powered Applications.
07/13/516
Because the batteries used in portable devices are
usually as small as possible, they present high internal
impedance under heavy loads, especially close to the end
of their discharge cycle. Unlike other boost converters
that struggle with high source impedance at startup,
the LTC3122 prevents high surge currents at startup.
1.8V to 5.5V Input to 12V Output Boost Regulator
The circuit in Figure 1 is designed for high efficiency and
small size. The LTC3122 operates at 1MHz to minimize
the size of the filter capacitors and boost inductor, and
uses Burst Mode operation to maintain high efficiency
at light loads, as shown in Figure 2. At heavier loads,
the converter can operate in constant frequency mode,
resulting in lower input and output ripple. Constant
frequency operation can result in lower EMI and is
easier to filter.
Efficiency can be increased by running the LTC3122 at
a relatively low switching frequency. Figure 3 shows
the results of reducing the switching frequency from
1MHz to 500kHz.
Efficiency can be improved further by increasing the
inductor size. Figure 4 shows the increase in efficiency
90
80
70
EFFICIENCY (%)
Introduction
Boost converters are regularly used in portable devices
to produce higher output voltages from lower battery
input voltages. Common battery configurations include
two to three alkaline or NiMH cells or, increasingly, LiIon batteries, yielding a typical input voltage between
1.8V and 4.8V.
60
50
40
30
20
VIN=2V, BURST MODE
VIN=3.3V, BURST MODE
VIN=2V, PWM MODE
VIN=3.3V, PWM MODE
10
0
0.1
1
10
IOUT (mA)
100
FSW = 1MHz
1000
dn4gpf F02
Figure 2. The High Efficiency of the LTC3122 Boost
Converter Extends Battery Life in Portable Applications.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are
registered trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
90
80
70
EFFICIENCY (%)
60
50
40
30
1MHz, BURST MODE
500kHz, BURST MODE
1MHz, PWM MODE
500kHz, PWM MODE
20
10
0
0.1
1
10
IOUT (mA)
100
1000
dn4gpf F03
Figure 3. The Efficiency is Greatly Affected by the Operating Frequency. At 100mA Load an Additional 4% Can Be
Gained by Reducing the Switching Frequency from 1MHz
to 500kHz.
Battery size should be taken into account when considering inductor size. Using a relatively small inductor
running at a high frequency may necessitate a correspondingly higher capacity battery to achieve the same
run time at relatively lower efficiency. In other words,
space gains achieved with a smaller inductor may be
replaced by the need for a bigger battery.
Output Disconnect
Typical boost converters cannot disconnect the output
from the input because of the boost diode. Current
always flows from the input through the inductor and
boost diode to the output. Therefore the output can not
be shorted or disconnected from the input, a significant
problem in many applications, especially in shutdown.
In contrast, the LTC3122 includes an internal switch
that disconnects the boost MOSFET body diode from
the output. This also allows for inrush current limiting
at turn-on, minimizing the surge currents seen by the
input power source.
source can lift the output rail to regulation. The input
current slowly ramps up. The input current overshoot
required to charge the output capacitor is limited to
only 200mA and the input power source voltage droop
is limited to 0.5V, as shown in Figure 5.
Conclusion
The LTC3122 boost converter serves the needs of
battery-operated applications that require low standby
quiescent current and high efficiency. Unlike many other
boost converters, it includes features, enableing operation from batteries near full discharge when battery ESR
becomes high. Its very low quiescent and shutdown
currents, combined with output disconnect, extend battery run time in applications with long idle periods. The
LTC3122 includes a complete set of features for high
performance battery operated applications and comes
in a small, thermally enhanced 3mm × 4mm package.
90
80
70
EFFICIENCY (%)
achieved by replacing the 4mm × 4mm boost inductor
(XAL4030-472) with a 7mm × 7mm inductor (744-777910 from Würth). The 90% efficiency at 10mA is 5%
higher than the efficiency shown in Figure 3.
60
50
40
30
VIN = 2V, BURST MODE
VIN = 3.3V, BURST MODE
VIN = 2V, PWM MODE
VIN = 3.3V, PWM MODE
20
10
0
0.1
1
10
IOUT (mA)
100
1000
FSW = 300kHz
dn4gpf F04
Figure 4. With a Lower Switching Frequency and a
Larger Inductor, a Smaller Battery Can Be Used. Efficiency Gain Up to 30% in the 1mA to 10mA Load Range
(in PWM Mode) Can Significantly Improve Applications
That Operate with Light Loads.
Figure 5 shows the output of the LTC3122 disconnected
in shutdown. The output voltage is pulled to zero by the
load following shutdown, and the LTC3122 consumes
less than 1µA of current.
Start-Up Inrush Current Limiting
To simulate a real battery-operated application, the
circuit in Figure 1 was tested with 1Ω of equivalent
series resistance (ESR) placed between the power
source and the LTC3122 circuit. Once the LTC3122 is
enabled, it controls the startup so that the input power
Data Sheet Download
www.linear.com/LT3122
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
dn4gpf F05
Figure 5. Inrush Current Limiting at Turn-On Minimizes Surge Currents Seen by the Input Source. The
Output Is Disconnected from Input During Shutdown.
For applications help,
call (408) 432-1900, Ext. 3788
dn516f LT/AP 0713 111K • PRINTED IN THE USA
LINEAR TECHNOLOGY CORPORATION 2013
Intelligent Systems
SoCKIT to Me!
Don’t Just Elevate, Integrate.
Arrow, Altera, and Linear Technology are pleased to offer an unprecedented opportunity for you
to learn about the new Altera SoC solutions during our global workshop series.
FIVE REASONS WHY USER-CUSTOMIZABLE
ARM-BASED SoCS ARE IDEAL:
> Reduce system power, cost, and board size by integrating
discrete processors and Digital Signal Processing (DSP)
functions into a single FPGA
EACH SoCKIT FEATURES:
> Altera Cyclone V SoC with Dual ARM® Cortex®-A9
processors and 110K LEs
> High Speed Mezzanine Connector (HSMC) including
transceivers
> Improve system performance via high-bandwidth
interconnect between the processor and the FPGA
> Two banks of low-power DDR3 memory
> Differentiate your end product by customizing in both
hardware and software
> Adjustable clock output by Silicon Labs
> Enhance system reliability with built-in error correction
code (ECC) and memory protection that protect your
system against potential hardware or software errors
> Develop ARM compatible software with unmatched target
visibility, control, and productivity using Altera’s exclusive
FPGA-adaptive debugging
EMBEDDED LINUX FOR SoC BOARDS
> One-stop shop for SoC Linux
> Get source and tools to jump start your
Linux project
> Engage with the SoC Linux community
Start your SoC Linux project here!
www.RocketBoards.org
arrow.com
> MicroSD card and Ethernet 10/100/1000 interfaces
> Graphic LCD: 128 x 64 (SPI Interface)
> VGA and Audio connections
> USB 2.0 OTG (Full Speed) and USB to UART connections
> 3-Axis digital accelerometer and temp sensor
> User’s manual/start-up guide, USB and power cables
35(6257('
67$1'$5'
863267$*(3$,'
6811<9$/(&$
3(50,712
GET YOUR FREE
High Performance Analog IC Demo Board Now!
Visit www.arrownac.com/ltcnewproducts
to register for your free demo board today
or contact your local Arrow sales
representative at 800-833-3557.
* Limited to current or potential Arrow customers with valid
opportunities that will be approved by Arrow Electronics.
www.arrownac.com/ltcnewproducts
