1

LT1020

sn1020 1020fcs

Micropower Regulator

and Comparator

s

Input Voltage Range: 4.5V to 36V

s

40

µA Supply Current

s

125mA Output Current

s

2.5V Reference Voltage

s

Reference Output Sources 1mA and Sinks 0.5mA

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Dual Output Comparator

s

Comparator Sinks 10mA

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Dropout Detector

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0.2V Dropout Voltage

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Thermal Limiting

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Available in SO Package

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Battery Systems

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Battery Backup Systems

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Portable Terminals

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Portable Instruments

The LT

lator and free collector comparator on a single monolithic

chip. With only 40

µA supply current, the LT1020 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 dropout detector

provides an output current to indicate when the regulator

is about to drop out of regulation.

The dual output comparator can be used as a comparator

for system or battery monitoring. For example, the com-

parator can be used to warn of low system voltage while

the dropout detector shuts down the system to prevent

abnormal operation. Frequency compensation of the com-

parator for amplifier applications can be obtained by

adding external output capacitance. Dual output or posi-

tive and negative regulators can also be made.

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

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

5V Regulator

Dropout Voltage and Supply Current

+

10

µF

10

µF

0.001

µF

1M

1M

5V

2

11

3

9

FB

GND

+

LT1020

1020 TA01

OUTPUT CURRENT (mA)

0.1

0.01

0.1

1

10

1000

1020 TA02

1

100

0.1

1

10

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

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