6

LTC1174

LTC1174-3.3/LTC1174-5

1174fe

(Pin 1 connection shown for LTC1174-3.3 and LTC1174-5, changes create LTC1174)

FU CTIO AL DIAGRA

–

+

–

+

–

+

0.1

Ω

RESET

1174 BD

1.25V

REFERENCE

Q

GND 4

5

SW

1

7

–

+

A1

×

R1*

31.5k

SET

6

3

SHUTDOWN

8

SLEEP

–

+

A3

A4

A5

* R1 = 51k FOR LTC1174-3.3

R1 = 93.5k FOR LTC1174-5

A2

SW(Pin5):Drain of the P-Channel MOSFETSwitch. Cathode

of Schottky diode must be closely connected to this pin.

close to ground Pin 4.

SHUTDOWN (Pin 8): Pulling this pin to ground keeps the

internal switch off and puts the LTC1174 in micropower

shutdown.

main voltage comparator’s input. On the LTC1174-3.3 and

LTC1174-5 this pin goes to an internal resistive divider

which sets the output voltage.

During shutdown the state of this pin is indeterminate.

Comparator. The “+” input is connected to a reference

voltage of 1.25V.

GND (Pin 4): Ground Pin.

PI FU CTIO S