LT1129CF-3.3 データシートの表示（PDF） - Linear Integrated System

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LT1129CF-3.3

Micropower Low Dropout Regulators with Shutdown

Linear Integrated System 

LT 1129/LT 1129-3.3/LT 1129-5

Micropower Low Dropout

Regulators with Shutdown

FEATURES

■ 0.4V Dropout Voltage

■ 700mA Output Current

■ 50µA Quiescent Current

■ No Protection Diodes Needed

■ Adjustable Output from 3.8V to 30V

■ 3.3V and 5V Fixed Output Voltages

■ Controlled Quiescent Current in Dropout

■ Shutdown

■ 16µA Quiescent Current in Shutdown

■ Stable with 3.3µF Output Capacitor

■ Reverse Battery Protection

■ No Reverse Output Current

■ Thermal Limiting

■ Surface Mount SOT-223 and DD Packages

U

APPLICATIO S

■ Low Current Regulator

■ Regulator for Battery-Powered Systems

■ Post Regulator for Switching Supplies

■ 5V to 3.3V Logic Regulator

DESCRIPTIO

The LT®1129/LT1129-3.3/LT1129-5 are micropower low

dropout regulators with shutdown. The devices are ca-

pable of supplying 700mA of output current with a dropout

voltage of 0.4V at maximum output. Designed for use in

battery-powered systems the low quiescent current, 50µA

operating and 16µA in shutdown, make them an ideal

choice. The quiescent current does not rise in dropout as

it does with many other low dropout PNP regulators.

Other features of the LT1129 /LT1129-3.3/LT1129-5 in-

clude the ability to operate with small output capacitors.

They are stable with only 3.3µF on the output while most

older devices require between 10µF and 100µF for stabil-

ity. Also the input may be connected to ground or a reverse

voltage without reverse current flow from output to input.

This makes the LT1129/LT1129-3.3/LT1129-5 ideal for

backup power situations where the output is held high and

the input is at ground or reversed. Under these conditions,

only 16µA will flow from the output pin to ground. The

devices are available in 5-lead TO-220, 5-lead DD and

3-lead SOT-223 packages.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

VIN > 5.5V

5V Supply with Shutdown

5

IN

1

OUT

LT1129-5

4

SHDN

2

SENSE

GND

3

5V OUT

500mA

+

3.3µF

SOLID TANTALUM

VSHDN (PIN 4) OUTPUT

< 0.25

OFF

> 2.8

ON

NC

ON

LT1129 • TA01

Dropout Voltage

0.6

0.5

0.4

0.3

0.2

0.1

0

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7

OUTPUT CURRENT (A)

LT1129 • TA02

112935fc

1

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