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LP3893

www.ti.com

SNVS237B–SEPTEMBER2003–REVISEDAPRIL2013

LP38933AFast-ResponseUltraLowDropoutLinearRegulators

CheckforSamples:LP3893

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FEATURES

DESCRIPTION

TheLP3893isahigh-current,fast-responseregulator

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•UltraLowDropoutVoltage(270mVat3Atyp)

whichcanmaintainoutputvoltageregulationwith

•LowGroundPinCurrent

minimuminputtooutputvoltagedrop.Fabricatedon

•LoadRegulationof0.04%/A

aCMOSprocess,thedeviceoperatesfromtwoinput

voltages:Vbiasprovidesvoltagetodrivethegateof

•60nATypicalQuiescentCurrentinShutdown

theN-MOSpowertransistor,whileVinistheinput

•1.5%OutputAccuracy(25°C)

voltagewhichsuppliespowertotheload.Theuseof

•TO-220,DDPAK/TO-263Packages

anexternalbiasrailallowstheparttooperatefrom

ultralowVinvoltages.Unlikebipolarregulators,the

•OverTemperature/OverCurrentProtection

CMOSarchitectureconsumesextremelylow

•−40°Cto+125°CJunctionTemperatureRange

quiescentcurrentatanyoutputloadcurrent.Theuse

ofanN-MOSpowertransistorresultsinwide

APPLICATIONS

bandwidth,yetminimumexternalcapacitanceis

requiredtomaintainloopstability.

•DSPPowerSupplies

•ServerCoreandI/OSupplies

Thefasttransientresponseofthesedevicesmakes

themsuitableforuseinpoweringDSP,

•LinearPowerSuppliesforPCAdd-in-Cards

MicrocontrollerCorevoltagesandSwitchMode

•Set-TopBoxPowerSupplies

PowerSupplypostregulators.Thepartsareavailable

•MicroprocessorPowerSupplies

inTO-220andDDPAK/TO-263packages.

•HighEfficiencyLinearPowerSupplies

DropoutVoltage:270mV(typ)at3Aloadcurrent.

•SMPSPost-Regulators

GroundPinCurrent:3mA(typ)atfullload.

ShutdownCurrent:60nA(typ)whenS/Dpinislow.

PrecisionOutputVoltage:1.5%roomtemperature

accuracy.

TYPICALAPPLICATIONCIRCUIT

Atleast10µFofinputandoutputcapacitanceisrequiredforstability.

*Tantalumcapacitorsarerecommended.Aluminumelectrolyticcapacitorsmaybeusedforrestrictedtemperature

range.Seeapplicationhints.

CONNECTIONDIAGRAM

Figure1.TO-220,TopViewFigure2.DDPAK/TO-263,TopView

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2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2003–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

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