MIC2920A/29201/29202/29204

Micrel, Inc.

February 2005

1

M9999-021505

MIC2920A/29201/29202/29204

400mA Low-Dropout Voltage Regulator

Features

•

High output voltage accuracy

•

Guaranteed 400mA output

•

Low quiescent current

•

Low dropout voltage

•

Extremely tight load and line regulation

•

Very low temperature coefficient

•

Current and thermal limiting

•

Input withstands –20V reverse battery and

60V positive transients

•

Error flag warns of output dropout

•

Logic-controlled electronic shutdown

•

Output programmable from 1.24V to 26V

(MIC29202/MIC29204)

•

Available in TO-220-3, TO-220-5, and surface-mount

TO-263-5, SOT-223, and SO-8 packages.

Applications

•

Battery-powered equipment

•

Cellular telephones

•

Laptop, notebook, and palmtop computers

•

PCMCIA V

•

Bar code scanners

•

Automotive electronics

•

SMPS post-regulators

•

Voltage reference

•

High-efficiency linear power supplies

General Description

The MIC2920Afamily are “bulletproof,” efficient voltage regu-

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

loads and 370mV at 250mA), and very low quiescent current

(140µA typical). The quiescent current of the MIC2920A in-

creases only slightly in dropout, prolonging battery life. Key

MIC2920A features include protection against reversed bat-

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

protection (60V positive transient).

The MIC2920 is available in several configurations. The

MIC2920A-x.x devices are three pin fixed voltage regulators

available in 3.3V, 4.85V, 5V, and 12V outputs. The MIC29201

is a fixed regulator offering a logic compatible ON/OFF (shut-

down) input and an error flag output. This flag may also be

used as a power-on reset signal.Alogic-compatible shutdown

input is provided on the adjustable MIC29202 which allows

the regulator to be switched on and off. The MIC29204 8-pin

SOIC adjustable regulator includes both shutdown and error

flagpinsandmaybepin-strappedfor5Voutputorprogrammed

from 1.24V to 26V using two external resistors.

MIC2920A-xxBT

(TO-220)

MIC29201/29202BT

(TO-220-5)

MIC29201/29202BU

(TO-263-5)

5-Lead Package Pinouts

MIC29201

MIC29202

1) Error

Adjust

2) Input

Shutdown

3) Ground

Ground

4) Output

Input

5) Shutdown

Output

Tab is Ground on SOT-223, TO-220, and TO-263 packages.

1

3

2

TAB

INPUT

OUTPUT

GROUND

MIC2920A-x.xBS

(SOT-223)

Pin Configuration

1

2

3

4

8

7

6

5

INPUT

NC

NC

E R R O R

OUTPUT

S E N S E

SHUTDOWN

GROUND

MIC29201-3.3BM (SOIC-8)

1

2

3

4

8

7

6

5

INPUT

ADJUST

5V TAP

E R R O R

OUTPUT

S E N S E

SHUTDOWN

GROUND

MIC29204BM (SOIC-8)

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

TAB

5

4

3

2

1

TAB

3

OUT

2

GND

1

IN

TAB

5

4

3

2

1