LT1120I 查看數據表（PDF） - Linear Technology

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LT1120I

Micropower Regulator with Comparator and Shutdown

Linear Technology 

LT1120

Micropower Regulator with

Comparator and Shutdown

FEATURES

■ 40μA Supply Current

■ 125mA Output Current

■ 2.5V Reference Voltage

■ Reference Output Sources 2mA and Sinks 2mA

■ Open Collector Comparator Sinks 10mA

■ Logic Shutdown

■ 0.2V Dropout Voltage

■ Thermal Limiting

■ Available in 8-Lead DIP and SO Packages

U

APPLICATIO S

■ Battery Systems

■ Battery-Backup System

■ Portable Terminals

■ Portable Instruments

■ Memory Keep-Alive

DESCRIPTIO

The LT®1120 is a combination micropower positive regu-

lator and free collector comparator on a single monolithic

chip. With only 40μA supply current, the LT1120 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 currents. Also

included on the chip is a class B output 2.5V reference that

can either source or sink current. 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.

The 2.5V reference will source or sink current. This allows

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

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

5V Regulator

VIN > 5.2V

IQ = 40μA

+

5

VIN

4

VOUT

10μF

LT1120

2

FB

SHDN

GND

3

1

0.001μF

5V

1M

+

25μF

1M

SHUTDOWN

1120 TA01

Dropout Voltage and Supply Current

1.00

10

0.10

1

0.01

0.1

1

10

100

OUTPUT CURRENT (mA)

0.1

1000

1120 TA02

1120fd

1

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