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LDO3V3
R15
LDO3V3 VCC-3.3V VCC-3.3V VCC-3.3V LDO3V3
LD4B
RED
R16
2K2
GPIO50-STAT
10K
C15
C16
C17
22uF
1uF
10nF
1uF
3K3
VSYS
3.3uH
FAULT
R20
C22
10K
22uF
BAT
EN4
VOUT
VBUS
VBUS
SW
FAULT#
LDO3V3
R23
1K69
LTC3586
19
18
17
16
15
14
13
L3
2.2uH
VCC-USB
LDO3V3
C31
C32
22uF
10uF
C19
C20
2.2uF
2.2uF
3
5
2
4
1
VCC-BAT
1
3
5
7
9
PWR-EN
C18
CN3
2
4
6
8
10
2.2uH
C23
10pF
HDR1
15K
VCC-5V VCC-5V VCC-5V
R26
88K7
R27
16K9
VCC-5V
VCC-5V
C29
C30
C27
C28
10pF
22uF
1uF
10nF
M1
AN
R11
1K
C21
DMP2305U
33pF
PWM
R12
4K7
INT
R13
4K7
ADC2-GPIO7
R22
105K
C24
300pF
HDR2
VCC-BAT
R10
1M
VCC-3.3V VCC-3.3V
R19
324K
R21
CN1
BATT
CONN
10uF
VSYS
GPIO31-SENSEL
VCC-3.3V
L2
VCC-BAT
C36
100nF
PWR-EN
VCC-5V
C25
100nF
VCC-USB
SWCD3
EN3
VOUT3
VOUT3
VIN3
VIN3
SWAB3
ILIM0
ILIM1
LDO3V3
CLPROG
NTC
VOUT4
VOUT4
SW4
MODE
FB4
FB3
VC3
VCC-USB
L1
32
33
34
35
36
37
38
VSYS
6
VSYS
R17
1K
VCC-BAT
1
2
3
4
5
6
7
8
9
10
11
12
VSYS
U2
LTC3586-1
GATE
CHRG#
PROG
FB1
VIN1
SW1
SW2
VIN2
FB2
VIN4
EN1
EN2
31
30
29
28
27
26
25
24
23
22
21
20
DMP2305U
PWR-EN
SW1
JS202011AQN
R18
M2
VCC-BAT
LDO3V3
C14
C33
100nF
VCC-3.3V
CN2
FP2
FERRITE
LD3
R8
470
C26
1
2
3
4
5
VBUS
DD+
ID
GND
10nF
VSYS
Figure 1-3: Power supply schematic
Page 8
R14
4K7
USB MINIB
VCC-3.3V
VCC-3.3V