1

LT1120A

1120afa

s

20

µA Supply Current

s

125mA Output Current

s

2.5V Reference

s

Reference Output Sources 4mA and Sinks 4mA

s

Open Collector Comparator Sinks 10mA

s

Logic Shutdown

s

0.2V Dropout Voltage

s

Thermal Limiting

s

8-Lead SO Package

The LT

regulator and free collector comparator on a single mono-

lithic chip. With only 20

µA supply current, the LT1120A

can supply over 125mA of output current. Input voltage

range is from 4.5V to 36V and dropout voltage is 0.6V at

125mA. Dropout voltage decreases with lower load cur-

rents. Also included on the chip is a class B output 2.5V

reference that can either source or sink current. This

allows it to be used as a supply splitter or auxiliary output.

A shutdown pin allows logic shutdown of the output.

The comparator can be used for system or battery moni-

toring. For example, the comparator can be used to warn

of low system voltage. Frequency compensation of the

comparator for amplifier applications can be obtained by

adding external output capacitance.

Micropower Regulator with

Comparator and Shutdown

Dropout Voltage and Supply Current

5V Regulator

1120A TA01

10

µF

1M

SHUTDOWN

1

3

54

2

0.001

µF

25

µF

1M

5V

LT1120A

GND

FB

+

+

OUTPUT CURRENT (mA)

0.1

0.01

1.00

1

1000

1120A TA02

10

0.10

100

0.1

10

1

s

Battery Systems

s

Battery Backup System

s

Portable Terminals

s

Portable Instruments

s

Memory Keep Alive

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

, LTC and LT are registered trademarks of Linear Technology Corporation.