Datasheet

13
LT1317/LT1317B
TYPICAL APPLICATIO S
U
2-Cell to 5V DC/DC Converter with Undervoltage Lockout
V
IN
LBI
SW
FB
LBO
LT1317
L1
10µH
D1
SHDN
33k
332k
1%
340k
1M
100k301k
1M
1%
3.3nF
470pF
1317 TA07
D1: MOTOROLA MBR0520LT1
L1: SUMIDA CD43-101

STARTS AT V
IN
= 1.9V
STOPS AT V
IN
= 1.6V
V
C
GND
2 ALKALINE
CELLS
5V
130mA
22µF
10V
+
100µF
10V
+
V
IN
SW
FB
LT1317
L1A
20µH
CERAMIC
10µF, 16V
L1B
D1
SHDN
33k
100k
432k
1%
V
OUT

4.1V
110mA
1M
1%
3.3nF
1317 TA08
D1: MOTOROLA MBR0520LT1
L1: COILTRONICS CTX20-1
Q1: 2N3904
V
C
GND
V
IN

1.5V TO
10V
15µF
20V
+
47µF
10V
+
Q1
Universal Wall Cube to 4.1V
V
IN
SW
FB
LT1317/LT1317B
L1
22µH
D1
SHDN
33k
178k
8.2V
400mA
1M
3.3nF
100pF
1317 TA09
D1: MOTOROLA MBR0520LT1
L1: SUMIDA CD43-220
V
C
GND
SHUTDOWN
22µF
16V
+
47µF
16V
+
2 Li-ION
CELLS
(5.8V TO
8.4V)
22pF
2 Li-Ion to 8.2V DC/DC Converter