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LISA-U series - System Integration Manual
External battery charging application circuit
LISA-U series modules do not have an on-board charging circuit. An example of a battery charger design,
suitable for applications that are battery powered with a Li-Ion (or Li-Polymer) cell, is provided in Figure 11.
In the application circuit, a rechargeable Li-Ion (or Li-Polymer) battery cell, that features proper pulse and DC
discharge current capabilities and proper DC series resistance, is directly connected to the VCC supply input of
LISA-U series module. Battery charging is completely managed by the STMicroelectronics L6924U Battery
Charger IC that, from a USB power source (5.0 V typ.), charges as a linear charger the battery, in three phases:

Pre-charge constant current (active when the battery is deeply discharged): the battery is charged with a
low current, set to 10% of the fast-charge current

Fast-charge constant current: the battery is charged with the maximum current, configured by the value
of an external resistor to a value suitable for USB power source (~500 mA)

Constant voltage: when the battery voltage reaches the regulated output voltage (4.2 V), the L6924U
starts to reduce the current until the charge termination is done. The charging process ends when the
charging current reaches the value configured by an external resistor to ~15 mA or when the charging timer
reaches the value configured by an external capacitor to ~9800 s
Using a battery pack with an internal NTC resistor, the L6924U can monitor the battery temperature to protect
the battery from operating under unsafe thermal conditions.
Alternatively the L6924U, providing input voltage range up to 12 V, can charge from an AC wall adapter. When
a current-limited adapter is used, it can operate in quasi-pulse mode, reducing power dissipation.
Li-Ion/Li-Polymer
Battery Charger IC
LISA-U series
5V0
USB
Supply
VIN
VOUT
FB1
VINSNS VOSNS
MODE
R1
R2
R3
C3
IUSB
IAC
Li-Ion/Li-Pol
Battery Pack
VREF
ISEL
R4
61 VCC
62 VCC
63 VCC
C4
TH
+
θ
IEND
C5 C6 C7 C8 C9
TPRG
SD
C1
B1
GND
GND
C2
U1
D1
Figure 11: Li-Ion (or Li-Polymer) battery charging application circuit
Reference
Description
Part Number - Manufacturer
B1
Li-Ion (or Li-Polymer) battery pack with 470  NTC
Various manufacturer
C1, C4
1 µF Capacitor Ceramic X7R 0603 10% 16 V
GRM188R71C105KA12 - Murata
C2, C6
10 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R71C103KA01 - Murata
C3
1 nF Capacitor Ceramic X7R 0402 10% 50 V
GRM155R71H102KA01 - Murata
C5
330 µF Capacitor Tantalum D_SIZE 6.3 V 45 m
T520D337M006ATE045 - KEMET
C7
100 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R61A104KA01 - Murata
C8
15 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1H150JA01 - Murata
C9
68 pF Capacitor Ceramic C0G 0402 5% 50 V
GRM1555C1H680JA01 - Murata
D1
Low Capacitance ESD Protection
USB0002RP or USB0002DP - AVX
FB1
Chip Ferrite Bead EMI Filter for GHz Band Noise
220  at 100 MHz, 260  at 1 GHz, 2000 mA
BLM18EG221SN1 - Murata
R1, R2
24 k Resistor 0402 5% 0.1 W
RC0402JR-0724KL - Yageo Phycomp
R3
3.3 k Resistor 0402 5% 0.1 W
RC0402JR-073K3L - Yageo Phycomp
R4
1.0 k Resistor 0402 5% 0.1 W
RC0402JR-071K0L - Yageo Phycomp
U1
Single Cell Li-Ion (or Li-Polymer) Battery Charger IC
for USB port and AC Adapter
L6924U - STMicroelectronics
Table 12: Suggested components for Li-Ion (or Li-Polymer) battery charging application circuit
UBX-13001118 - R17
Advance information
System description
Page 29 of 190