Schema

5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
CHARGING CRT 350mA
SWITCH TO BATTERY
WHEN VIN < 4V
SEQUENTMICROSYSTEMS.COM
POWER SUPPLY 4.0
WATCHDOG+
A
2 4Sunday, July 05, 2020
Title
Size Document Number Rev
Date: Sheet of
+5VIN
VBAT
0.6V
SW
+5V
2.5V
CUTBAT
VB
VBAT
VBAT
R18
100K
L1 6.8 uH
R21
5.9K
R25
2.05K
C4
1uF
C14
22uF
R17
47
C2
.1uF
C9
22uF
R24
14K
TP4
R14
2.05K
C10
1uF
+
B1
3.7V
R19
14K
Q4 BC857BS
4 1
3 5 2 6
F1
3A FUSE
D2
SK56B
U3
NCP114BSN330T1G
5
3
2
1
4
OUT
EN
GND
IN
NC
IN-
IN+
VCC
OUT
GND
U5
TS391
1
3
4
5
2
Q6
SI2333
1
3
2
U2
TP4054
3
1
2
4
5
BAT
CHRG
GND
VCC
PROG
R13
64.9K
R11
10K
D3
LM4040
2 1
3
C13
22uF
U4
MT3608
1
4
2
5
6
3
SW
EN
GND
VIN
NC
FB
R12
100K
C3
1uF
Q3
SI2333
1
3 2
C15
.1uF
C11
22uF
R20
10K
+5VIN
CHRG
3.3V
GND
VBAT
+5V
+5VF
EN
VB
+5V