Texas Instruments LP2957 Handleiding

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LP2957,LP2957A

www.ti.com

SNVS102C–JUNE1998–REVISEDAPRIL2013

LP2957/LP2957A5VLow-DropoutRegulatorforµPApplications

CheckforSamples:LP2957,LP2957A

1

FEATURES

DESCRIPTION

TheLP2957isa5Vmicropowervoltageregulator

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•5VOutputwithin1.4%OverTemperature(A

withelectronicshutdown,errorflag,verylow

Grade)

quiescentcurrent(150µAtypicalat1mAload),and

•EasilyProgrammedforSnap-On/Snap-Off

verylowdropoutvoltage(470mVtypicalat250mA

Output

loadcurrent).

•Ensured250mAOutputCurrent

Outputcanbewiredforsnap-on/snap-offoperationto

•ExtremelyLowQuiescentCurrent

eliminatetransitionvoltagestateswhereµPoperation

maybeunpredictable.

•LowInput-OutputVoltageRequiredfor

Regulation

Outputcrowbar(50mAtypicalpull-downcurrent)will

•ReverseBatteryProtection

bringdowntheoutputquicklywhentheregulator

snapsofforwhentheshutdownfunctionisactivated.

•ExtremelyTightLineandLoadRegulation

Theparthastightlineandloadregulation(0.04%

•VeryLowTemperatureCoefficient

typical)andlowoutputtemperaturecoefficient(20

•CurrentandThermalLimiting

ppm/°Ctypical).

•ErrorFlagSignalswhenOutputisoutof

Theaccuracyofthe5Voutputisensuredatroom

Regulation

temperatureandoverthefulloperatingtemperature

range.

APPLICATIONS

TheLP2957isavailableinthefive-leadTO-220and

•High-EfficiencyLinearRegulator

DDPAK/TO-263packages.

•Battery-PoweredRegulator

PackageOutline

TopViewTopView

Figure1.Bent,StaggeredLeadsFigure2.PlasticSurfaceMountPackage

5-LeadTO-220Package5-LeadDDPAK/TO-263Package

SeePackageNumberNDH0005DSeePackageNumberKTT0005B

SideView

Figure3.SeePackageNumberKTT0005B

Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam

duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.

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Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©1998–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties