Datasheet

7
LTC1477/LTC1478
TYPICAL APPLICATIONS
U
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Adding Short-Circuit Protection to an LT1301 Step-Up Switching Regulator (0.01µA Standby Current)
+
LTC1477/1478 • TA09
LT1304CS8-5
22µH
SUMIDA
CD54-220
MBRS130LT3
(5V)(2.7V to 4.2V)
SW
SENSENC
220k
*PRIMARY Li-Ion BATTERY PROTECTION MUST BE PROVIDED BY AN INDEPENDENT CIRCUIT
LBO
V
IN
I
LIM
LBI
34
100µF
10V
TANT
8
2
5
6
7
1
SHDN
LTC1477
V
OUT
V
IN2
GND
V
OUT
V
IN1
V
INS
NC
NC
V
IN3
EN
562k
1%
432k
1%
SINGLE
Li-Ion
CELL*
+
100µF
16V
+
1µF
5V
Single Li-Ion Cell to 5V Converter/Switch with Load Disconnect Below 2.7V
+
100µF
10V
0.1µF
DN117 • F03
ON/OFF
LTC1477
V
OUT
V
IN2
V
IN3
GND
V
OUT
V
IN1
V
INS
EN
5V
+
NC
47µF
16V
TANT
0.1µF


12V
L1*
10µH

D1
MBRS130LT3
18
76
3
24
5
SW
GND
V
IN
SEL
SHDN
SENSE
I
LIM
PGND
LT1301
*COILCRAFT DO1608-103
5V to 3.3V Selector Switch with Slope Control and 0.01µA Standby Current
*ALLOW AT LEAST 100ms BETWEEN 5V AND 3.3V SWITCHING FOR DISCHARGE OF 100µF OUTPUT CAPACITOR
LTC1478
AV
OUT
BV
OUT
BV
IN2
BV
IN3
GND
AEN
AV
INS
AV
IN1
AV
OUT
BV
OUT
BV
IN1
BV
INS
BEN
GND
AV
IN3
AV
IN2
0.1µF
0.1µF
5V
3.3V
3.3V ON/OFF*
5V ON/OFF*
+
100µF
10V
1k
5V/2A OR
3.3V/2A
LTC1477/1478 • TA08