LT1121CS85PBF Linear Technology Corporation, LT1121CS85PBF Datasheet

LT1121CS85PBF

Manufacturer Part Number

LT1121CS85PBF

Description

SOP8

Manufacturer

Linear Technology Corporation

Datasheet

1.LT1121CS85PBF.pdf (16 pages)

Specifications of LT1121CS85PBF

Date_code

08+

Current page: 1 of 16
Download datasheet (176Kb)

FEATURES

APPLICATIONS

TYPICAL APPLICATION

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

Low Current Regulator

Regulator for Battery-Powered Systems

Post Regulator for Switching Supplies

5V Battery-Powered Supply with Shutdown

SHDN

<0.25

>2.8

LT1121-3.3

(PIN 5)

GND

OUTPUT

OUT

OFF

LT1121 • TA01

1μF

SOLID TANTALUM

3.3V

150mA

OUT

DESCRIPTION

The LT

dropout regulators with shutdown. These devices are ca-

pable of supplying 150mA of output current with a dropout

voltage of 0.4V. Designed for use in battery-powered sys-

tems, the low quiescent current, 30μA operating 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 include

the ability to operate with very small output capacitors. 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 manufactur-

ability. Also the input may be connected to ground or a

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

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

All other trademarks are the property of their respective owners.

LT1121/LT1121-3.3/LT1121-5

Regulators with Shutdown

Micropower Low Dropout

1121/LT1121-3.3/LT1121-5 are micropower low

0.5

0.4

0.3

0.2

0.1

Dropout Voltage

OUTPUT CURRENT (mA)

100

120 140

LT1121 • TA02

160

1121ff

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