LT121IZ-3.3(RevE) Просмотр технического описания (PDF) - Linear Technology

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производитель

LT121IZ-3.3
(Rev.:RevE)

Micropower Low Dropout Regulators with Shutdown

Linear Technology 

FEATURES

■ 0.4V Dropout Voltage

■ 150mA Output Current

■ 30μA Quiescent Current

■ No Protection Diodes Needed

■ Adjustable Output from 3.75V to 30V

■ 3.3V and 5V Fixed Output Voltages

■ Controlled Quiescent Current in Dropout

■ Shutdown

■ 16μA Quiescent Current in Shutdown

■ Stable with 0.33μF Output Capacitor

■ Reverse Battery Protection

■ No Reverse Current with Input Low

■ Thermal Limiting

■ Available in the 8-Lead SO, 8-Lead PDIP, 3-Lead

SOT-23 and 3-Lead TO-92 Packages

U

APPLICATIO S

■ Low Current Regulator

■ Regulator for Battery-Powered Systems

■ Post Regulator for Switching Supplies

TYPICAL APPLICATIO

5V Battery-Powered Supply with Shutdown

8 IN

1

OUT

3.3VOUT

150mA

+

5V

LT1121-3.3

1μF

SOLID TANTALUM

5 SHDN

GND

3

VSHDN (PIN 5) OUTPUT

<0.25

OFF

>2.8

ON

NC

ON

LT1121 • TA01

LT1121/LT1121-3.3/LT1121-5

Micropower Low Dropout

Regulators with Shutdown

DESCRIPTIO

The LT®1121/LT1121-3.3/LT1121-5 are micropower low

dropout regulators with shutdown. These devices are

capable of supplying 150mA of output current with a

dropout voltage of 0.4V. Designed for use in battery-

powered systems, the low quiescent current, 30μA oper-

ating and 16μA in shutdown, makes them an ideal choice.

The quiescent current is well-controlled; it does not rise in

dropout as it does with many other low dropout PNP

regulators.

Other features of the LT1121/LT1121-3.3/LT1121-5 in-

clude the ability to operate with very small output capaci-

tors. They are stable with only 0.33μF on the output while

most older devices require between 1μF and 100μF for

stability. Small ceramic capacitors can be used, enhancing

manufacturability. Also the input may be connected to

ground or a reverse voltage without reverse current flow

from output to input. This makes the LT1121 series 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.

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

All other trademarks are the property of their respective owners.

Dropout Voltage

0.5

0.4

0.3

0.2

0.1

0

0 20 40 60 80 100 120 140 160

OUTPUT CURRENT (mA)

LT1121 • TA02

1121fe

1

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