MIC2920A/29201/29202/29204

Micrel

January 1998

3-9

3

12

3

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, 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 MIC2920A family are “bulletproof,” efficient voltage

regulators with very low dropout voltage (typically 40mV at

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

current (140

µAtypical).ThequiescentcurrentoftheMIC2920A

increases only slightly in dropout, prolonging battery life. Key

MIC2920A features include protection against reversed battery,

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

(shutdown) 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 MIC29202

which allows the regulator to be switched on and off. The

MIC29204 8-pin SOIC adjustable regulator includes both

shutdown and error flag pins and may be pin-strapped for 5V

output or programmed from 1.24V to 26V using two external

resistors.

MIC2920A-xxBT

(TO-220)

MIC29201/29202BT

(TO-220-5)

12345

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.

13

2

TAB

INPUT

OUTPUT

GROUND

MIC2920A-x.xBS

(SOT-223)

Pin Configuration

12345

INPUT

OUTPUT

GROUND

1

2

3

4

8

7

6

5

INPUT

NC

NC

ERROR

OUTPUT

SENSE

SHUTDOWN

GROUND

MIC29201-3.3BM (SO-8)

1

2

3

4

8

7

6

5

INPUT

ADJUST

5V TAP

ERROR

OUTPUT

SENSE

SHUTDOWN

GROUND

MIC29204BM (SO-8)