MIC2954 查看數據表（PDF） - Micrel

零件编号

产品描述 (功能)

比赛名单

MIC2954

250mA Low-Dropout Regulator

Micrel 

MIC2954

250mA Low-Dropout Regulator

General Description

Features

The MIC2954 is a “bulletproof” efficient voltage regulator • High-accuracy 5V, guaranteed 250mA output

with very low dropout voltage (typically 40mV @ light loads

and 375mV @ 250mA), and low quiescent current (120µA

typical). 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 programmed from 1.24V to 29V

• 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

positive transients

• Error flag warns of low output voltage

• Logic-controlled electronic shutdown

• Output programmable from 1.24V to 29V

(MIC2954-07/08)

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

223 and SOIC-8 packages

with the use of two external resistors.

The MIC2954 is available in two voltage tolerances, ±0.5% Applications

maximum and ±1% maximum. Both are guaranteed for

junction temperatures from –40°C to +125°C.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

• Battery powered equipment

• Cellular telephones

• Laptop, notebook, and palmtop computers

• PCMCIA VCC and VPP regulation/switching

• Bar code scanners

• Automotive electronics

• SMPS post-regulator/dc-to-dc modules

• Voltage reference

• High-efficiency linear power supplies

___________________________________________________________________________________________________________

Ordering Information

Part Number

Standard

Pb-Free /

RoHS Compliant

Accuracy

Junction

Temp. Range

Package

MIC2954-02BT MIC2954-02WT*

0.5%

–40° to +125°C

TO-220-3

MIC2954-03BT MIC2954-03WT*

1.0%

–40° to +125°C

TO-220-3

MIC2954-02BS MIC2954-02WS*

0.5%

–40° to +125°C

SOT-223-3

MIC2954-03BS MIC2954-03WS*

1.0%

–40° to +125°C

SOT-223-3

MIC2954-02BZ MIC2954-02YZ

0.5%

–40° to +125°C

TO-92-3**

MIC2954-03BZ MIC2954-03YZ

1.0%

–40° to +125°C

TO-92-3**

MIC2954-07BM MIC2954-07YM

0.5%

–40° to +125°C

8-Pin SOIC

MIC2954-08BM MIC2954-08YM

1.0%

–40° to +125°C

8-Pin SOIC

* RoHS compliant with ‘high-melting solder’ exemption.

** TO-92 package discontinuance notification issued September 2007. End-of-life-buy offered thru December 31, 2007.

Contact factory for additional information.

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

September 2007

M9999-090607

Share Link: