MIC2937A/29371/29372

Micrel, Inc.

May 2006

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MIC2937A/29371/29372

Features

•

High output voltage accuracy

•

Guaranteed 750mA output

•

Low quiescent current

•

Low dropout voltage

•

Extremely tight load and line regulation

•

Very low temperature coefficient

•

Current and thermal limiting

•

Input can withstand –20V reverse battery and +60V posi-

tive transients

•

Error flag warns of output dropout

•

Logic-controlled electronic shutdown

•

Output programmable from 1.24V to 26V(MIC29372)

•

Available in TO-220, TO-263, TO-220-5, and TO-263-5

packages.

Applications

•

Battery Powered Equipment

•

Cellular Telephones

•

Laptop, Notebook, and Palmtop Computers

•

PCMCIA V

•

Bar Code Scanners

•

Automotive Electronics

•

SMPS Post-Regulator/ DC to DC Modules

•

High Efficiency Linear Power Supplies

Pin Configuration

GROUND OUTPUT

INPUT

TO-220-5 Package

(MIC29371/29372BT/WT)

TO-220 Package

(MIC2937A-xxBT/WT)

General Description

The MIC2937A family are “bulletproof” efficient voltage regu-

lators with very low dropout voltage (typically 40mV at light

loads and 300mV at 500mA), and very low quiescent current

(160µA typical). The quiescent current of the MIC2937A in-

creases only slightly in dropout, thus prolonging battery life.

Key MIC2937A features include protection against reversed

battery, fold-back current limiting, and automotive “load dump”

protection (60V positive transient).

The MIC2937 is available in several configurations. The

MIC2937A-xx devices are three pin fixed voltage regulators

with 3.3V, 5V, and 12V outputs available. The MIC29371 is

a fixed regulator offering logic compatible ON/OFF switching

input and an error flag output. This flag may also be used as

a power-on reset signal. A logic-compatible shutdown input

is provided on the adjustable MIC29372, which enables the

regulator to be switched on and off.

TO-263 Package

(MIC2937A-xxBU/WU)

GROUND OUTPUT

INPUT

TO-263-5 Package

(MIC29371/29372BU/WU)

Five Lead Package Pin Functions:

MIC29371

MIC29372

1) Error

Adjust

2) Input

Shutdown

3) Ground

Ground

4) Output

Input

5) Shutdown Output

The TAB is Ground on the TO-220 and TO-263 packages.

MIC2937A/29371/29372

750mA Low-Dropout Voltage Regulator

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

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