7

LTC1477/LTC1478

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 (0.01

µA Standby Current)

+

LTC1477/1478 • TA09

LT1304CS8-5

22

µH

SUMIDA

CD54-220

MBRS130LT3

(5V)

(2.7V to 4.2V)

SW

SENSE

NC

220k

*PRIMARY Li-Ion BATTERY PROTECTION MUST BE PROVIDED BY AN INDEPENDENT CIRCUIT

LBO

LBI

34

100

µF

10V

TANT

8

2

5

6

7

1

SHDN

LTC1477

GND

NC

NC

EN

562k

1%

432k

1%

SINGLE

Li-Ion

CELL*

+

100

µF

16V

+

1

µF

5V

Single Li-Ion Cell to 5V Converter/Switch with Load Disconnect Below 2.7V

+

100

µF

10V

0.1

µF

DN117 • F03

ON/OFF

LTC1477

GND

EN

5V

+

NC

47

µF

16V

TANT

0.1

µF

12V

L1*

10

µH

D1

MBRS130LT3

1

8

7

6

3

24

5

SW

GND

SEL

SHDN

SENSE

PGND

LT1301

*COILCRAFT DO1608-103

5V to 3.3V Selector Switch with Slope Control and 0.01

µA Standby Current

*ALLOW AT LEAST 100ms BETWEEN 5V AND 3.3V SWITCHING FOR DISCHARGE OF 100

µF OUTPUT CAPACITOR

LTC1478

GND

AEN

BEN

GND

0.1

µF

0.1

µF

5V

3.3V

3.3V ON/OFF*

5V ON/OFF*

+

100

µF

10V

1k

5V/2A OR

3.3V/2A

LTC1477/1478 • TA08