LT1129IQ3.3PBF Linear Technology Corporation, LT1129IQ3.3PBF Datasheet

LT1129IQ3.3PBF

Manufacturer Part Number

LT1129IQ3.3PBF

Description

TO-263

Manufacturer

Linear Technology Corporation

Datasheet

1.LT1129CQTRPBF.pdf (16 pages)

Specifications of LT1129IQ3.3PBF

Date_code

08+

Current page: 1 of 16
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APPLICATIONS

TYPICAL APPLICATION

FEATURES

400mV 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-Pak Packages

Low Current Regulator

Regulator for Battery-Powered Systems

Post Regulator for Switching Supplies

5V to 3.3V Logic Regulator

> 5.5V

5V Supply with Shutdown

SHDN

< 0.25

> 2.8

(PIN 4)

LT1129-5

GND

SENSE

OUTPUT

OUT

OFF

3.3μF

SOLID TANTALUM

5V OUT

500mA

112935 TA01

DESCRIPTION

The LT

dropout regulators with shutdown. The devices are capable

of supplying 700mA of output current with a dropout

voltage of 400mV 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 include

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 stability. Also

the input may be connected to ground or a reverse voltage

without reverse current ﬂ ow 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 ﬂ ow from the output pin to ground. The

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

3-lead SOT-223 packages.

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

All other trademarks are the property of their respective owners.

LT1129/LT1129-3.3/LT1129-5

Regulators with Shutdown

Micropower Low Dropout

1129/LT1129-3.3/LT1129-5 are micropower low

0.6

0.5

0.2

0.4

0.3

0.1

Dropout Voltage

0.2

OUTPUT CURRENT (A)

0.3

0.4

0.5

0.6

112935 TA02

0.7

112935ff

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