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Figure 1-3: Power supply schematic
VCC-BAT
VCC-BAT
T2
T3
VCC-USB
VCC-USB
VCC-3.3V
VCC-3.3V
VCC-3.3V
VCC-3.3V
VCC-5V
VCC-5V VCC-5V VCC-5V
LDO3V3
LDO3V3
PWR-EN
PWR-EN
VCC-BAT
VCC-3.3V
VCC-5V
VCC-5V
VCC-3.3V
LDO3V3
LDO3V3
VCC-BAT
VCC-3.3V
VCC-USB
VSYS
VSYS
VSYS
VSYS
VCC-BAT
LDO3V3
PWR-EN
LDO3V3
FAULT
GPIO204
GPIO040
GPIO026
GP
IO
11
3
GP
IO
03
2
GP
IO
15
7
GP
IO
15
6
R5
10k
R6
10k
R10
1M
R12
100k
R13
100k
R14
100k
C33
0.1µF
R15
2.2k
R16
10k
R18
3.3k
R20
10k
R11
1k
R17
1k
C18
0.1µF
R27
16.9k
R23
1.69k
R26
88.7k
R21
15k
R22
105k
R19
324k
C25
0.1µF
R8
470
IL
IM
0
1
IL
IM
1
2
LD
O
3V
3
3
CL
PR
OG
4
NT
C
5
VO
UT
4
6
VO
UT
4
7
SW
4
8
M
OD
E
9
FB
4
10
FB
3
11
VC
3
12
SWAB3
13
VIN3
14
VIN3
15
VOUT3
16
VOUT3
17
EN3
18
SWCD3
19
EN
2
20
EN
1
21
VI
N4
22
FB
2
23
VI
N2
24
SW
2
25
SW
1
26
VI
N1
27
FB
1
28
PR
OG
29
CH
RG
#
30
GA
TE
31
BAT
32
EN4
33
VOUT
34
VBUS
35
VBUS
36
SW
37
FAULT#
38
LTC3586
U2
LTC3586EUFE
LD1
LD2
LD4
LD3
LED GREEN
C15
1µF
C17
1µF
C16
10000pF
C14
22µF
C31
22µF
C30
22µF
C27
1µF
C28
10000pF
C32
10µF
C29
10pF
C36
10µF
C19
2.2µF
C20
2.2µF
3
2
1
M2
DMP2305U-7
3
2
1
M1
DMP2305U-7
C24
300pF
C21
33pF
C2310pF
C22
47µF
2
1
CN1
SHM1x2
1
2
3
4
5
6
SW1
JS202011AQN
R1
1k
R2
1k
C44
1µF
VSYS
VCC-3.3V
L2
2.2µH
L3
2.2µH
L1 3.3µH
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