Datasheet

9
LTC1754-3.3/LTC1754-5
TYPICAL APPLICATIO S
U
Low Power Battery Backup with Autoswitchover and No Reverse Current
C
–
1µF
C
+
V
IN
46
13
2
15
+
4
3
6
10k
1.2M
5
2
175433 TA03
1
8
HIGH = BACKUP MODE
3
2
7
10µF
V
OUT
= 3.3V
I
OUT
≤ 300mA
I
OUT
≤ 20mA BACKUP
V
OUT
LTC1754-3.3
LTC1540
SHDN
GND
10µF
2-CELL
NiCd
BATTERY
10µF
75k
1N4148
V
IN
5V
475k
1M
LTC1521-3.3
5
46
LTC1754-5
1µF
3
1
2
1754 TA06
10µF 10µF
V
OUT
5V ±4%
50mA
USB Port to Regulated 5V Power Supply