7

LTC1157

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.

TYPICAL APPLICATIO S

Ultra Low Voltage Drop Battery Switch with Reverse Battery

Protection, Ramped Output and 3

µA Standby Current

Generating 3.3V and 5V from a 3.3V or 5V Source

(Automatic Switching)

1

2

3

4

7,8

2

5,6

4

3

1

5,6

7,8

5V/150mA

3.3V/150mA

Si9956DY

Si9956DY

+

MBRS12OT3

+

GND

FB

SW2

SET

AO

LT1111

SW1

2N7002

*20

µH

120

µF/10V

*20

µH

100

µF

6V

140k

1%

174k

1%

105k

1%

ZTX869-M1

47

Ω

39

Ω

1M

12

3

4

8

5

6

7

430k

+

180

µF

6V

2N7002

1M

1M

3.3V OR 5V

GND

G2

G1

IN2

IN1

LTC1157

*CTX20-3 COILTRONICS

LTC1157 • TA07

GND

G2

G1

IN2

IN1

LTC1157

CONTROL

LOGIC

OR

µP

0.47

µF

LTC1157 • TA06

+

3 TO 4

CELL

BATTERY

PACK

300

Ω

0.1

µF

1k

100k

1

24

3

5,6,7,8

Si9956DY

+

100

µF

6.3V

SWITCHED (RAMPED)

BATTERY