MIC2954-02 Micrel Semiconductor, MIC2954-02 Datasheet

MIC2954-02

Manufacturer Part Number

MIC2954-02

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC2954-02.pdf (12 pages)

Specifications of MIC2954-02

Date_code

08+

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Download datasheet (98Kb)

General Description

The MIC2954 is a “bulletproof” efficient voltage regulator with

very low dropout voltage (typically 40mV at light loads and

375mV at 250mA), and low quiescent current (120 A typi-

cal). The quiescent current of the MIC2954 increases only

slightly in dropout, thus prolonging battery life. Key MIC2954

features include protection against reversed battery, fold-

back current limiting, and automotive load dump protection

(60V positive transient).

The MIC2954-07/08BM is an adjustable version that includes

an error flag output that warns of a low output voltage, which

is often due to failing batteries on the input. This may also be

used as a power-on reset. A logic-compatible shutdown input

is provided which enables the regulator to be switched on and

off. This part may be pin-strapped for 5V output, or pro-

grammed from 1.24V to 29V with the use of two external

resistors.

The MIC2954 is available in two voltage tolerances, 0.5%

maximum and

junction temperatures from –40 C to +125 C.

The MIC2954 has a very low output voltage temperature

coefficient and extremely good load and line regulation

(0.04% typical).

Typical Applications

August 1999

MIC2954

SHUTDOWN

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

5V or 3V Selectable Regulator with Shutdown

ENABLE

3.3V

+7V

MIC2954-07/-08

1% maximum. Both are guaranteed for

SHDN

5V Fixed Regulator

GND

MIC2954

GND

Q1 OFF = 5.0V

Q1 ON = 3.3V

OUT

ERR

OUT

470k

220k

100pF

2N2222

2.2µF

OUT

180k

300k

5V or 3.3V

3.3µF

OUT

Features

• High-accuracy 5V, guaranteed 250mA 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

• Error flag warns of low output voltage

• Logic-controlled electronic shutdown

• Output programmable from 1.24V to 29V

• Available in TO-220, TO-92, and surface-mount

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

• Voltage reference

• High-efficiency linear power supplies

+60V positive transients

(MIC2954-07/08)

SOT-223 and SOP-8 packages

SHUTDOWN

OUT

SHUTDOWN

ENABLE

Wide Input-Voltage-Range Current Limiter

ENABLE

250mA Low-Dropout Regulator

REF

and V

Adjustable Regulator

MIC2954-07/-08

Final Information

SHDN

MIC2954

100k

GND

regulation/switching

OUT

ERR

OUT

ERR

2, 6 = OPEN

REF

100pF

* MINIMUM INPUT-TO-OUTPUT

VOLTAGE RANGES FROM

40mV TO 400mV DEPENDING

UPON LOAD CURRENT

OUT

1.2V to 30V

10µF

MIC2954

OUT

ERR

Micrel

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