8
LTC1517-3.3
15173fs, sn15173 LT/TP 0998 4K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1998
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear-tech.com
TYPICAL APPLICATION
U
3.3µF
75k
2-CELL
NiCd
1517-3.3 TA03
1
3
4
5
6
3
2
2
3
7
8
1.1M
3.9V
TRIP
2
1
1
4
5
0.1µF
LOGIC LOW = BACKUP MODE
LTC1517-3.3
LTC1540
LT1521-3.3
1µF
MAIN
SUPPLY
5V
BAT54
TRICKLE CHARGE
AND LTC1517-3.3
I
DD
1.5µF
V
OUT
= 3.3V,
I
OUT
= 300mA
(I
OUT
= 8mA IN
BACKUP MODE)
3.3µF
SILICONIX
Si2301DS
470k
+
–
Low Power Battery Backup Supply with Autoswitchover and No Reverse Current
PART NUMBER DESCRIPTION COMMENTS
LTC1514-X Step-Up/Step-Down Switched-Capacitor DC/DC Converter with 3.3V or 5V Output up to 50mA
Low Battery Comparator
LTC1515 Step-Up/Step-Down Switched-Capacitor DC/DC Converter with POR Fixed or Adjustable Output up to 50mA
LTC1516 Micropower Regulated 5V Charge Pump DC/DC Converter 20mA for V
IN
≥ 2V, 50mA for V
IN
≥ 3V
LTC1517-5 Micropower Regulated 5V Charge Pump in a 5-Pin SOT-23 Package I
OUT
up to 20mA
LTC1522 Micropower Regulated 5V Charge Pump DC/DC Converter Same as LTC1517-5 with Shutdown
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