LT1521 Linear Technology, LT1521 Datasheet

LT1521

Manufacturer Part Number

LT1521

Description

300mA Low Dropout Regulators with Micropower Quiescent Current and Shutdown

Manufacturer

Linear Technology

Datasheet

1.LT1521.pdf (16 pages)

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APPLICATIONS

FEATURES

TYPICAL

Low Current Regulator

Regulator for Battery-Powered Systems

Post Regulator for Switching Supplies

Dropout Voltage: 0.5V

Output Current: 300mA

Quiescent Current: 12 A

No Protection Diodes Needed

Adjustable Output from 3.8V to 20V

Fixed Output Voltages: 3V, 3.3V, 5V

Controlled Quiescent Current in Dropout

Shutdown I

Reverse Battery Protection

No Reverse Current

Thermal Limiting

5V Battery-Powered Supply with Shutdown

APPLICATION

1 F

= 6 A

SHDN

<0.25

>2.80

LT1521-5

(PIN 5) OUTPUT

GND

SENSE

OFF

OUT

Quiescent Current and Shutdown

LT1521 • TA01

1.5 F

300mA

Regulators with Micropower

DESCRIPTION

The LT

dropout regulators with micropower quiescent current

and shutdown. These devices are capable of supplying

300mA of output current with a dropout voltage of 0.5V.

Designed for use in battery-powered systems, the low

quiescent current, 12 A operating and 6 A 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 LT1521/LT1521-3/LT1521-3.3/

LT1521-5 include the ability to operate with very small

output capacitors. They are stable with only 1.5 F on the

output while most older devices require between 10 F and

100 F for stability. Small ceramic capacitors can be used,

enhancing manufacturability. Also, the input may be con-

nected to voltages lower than the output voltage, including

negative voltages, without reverse current flow from out-

put to input. This makes the LT1521 series ideal for backup

power situations where the output is held high and the

input is low or reversed. Under these conditions only 5 A

will flow from the output pin to ground.

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

1521/LT1521-3/LT1521-3.3/LT1521-5 are low

0.6

0.5

0.1

0.4

0.3

0.2

300mA Low Dropout

Dropout Voltage

OUTPUT CURRENT (mA)

LT1521-3.3/LT1521-5

100

150

LT1521/LT1521-3

200

250

LT1521 • TA02

300

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