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LP3892

www.ti.com

SNVS236D–SEPTEMBER2003–REVISEDAPRIL2013

LP38921.5AFast-ResponseUltraLowDropoutLinearRegulators

CheckforSamples:LP3892

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FEATURES

DESCRIPTION

TheLP3892isahighcurrent,fastresponseregulator

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•UltraLowDropoutVoltage(140mVat1.5A

whichcanmaintainoutputvoltageregulationwith

typ)

minimuminputtooutputvoltagedrop.Fabricatedon

•LowGroundPinCurrent

aCMOSprocess,thedeviceoperatesfromtwoinput

•LoadRegulationof0.04%/A

voltages:Vbiasprovidesvoltagetodrivethegateof

theN-MOSpowertransistor,whileVinistheinput

•60nATypicalQuiescentCurrentinShutdown

voltagewhichsuppliespowertotheload.Theuseof

•1.5%OutputAccuracy(25°C)

anexternalbiasrailallowstheparttooperatefrom

•TO-220,DDPAK/TO-263andSOPowerPAD-8

ultralowVinvoltages.Unlikebipolarregulators,the

Packages

CMOSarchitectureconsumesextremelylow

quiescentcurrentatanyoutputloadcurrent.Theuse

•OverTemperature/OverCurrentProtection

ofanN-MOSpowertransistorresultsinwide

•−40°Cto+125°CJunctionTemperatureRange

bandwidth,yetminimumexternalcapacitanceis

requiredtomaintainloopstability.

APPLICATIONS

Thefasttransientresponseofthesedevicesmakes

•DSPPowerSupplies

themsuitableforuseinpoweringDSP,

MicrocontrollerCorevoltagesandSwitchMode

•ServerCoreandI/OSupplies

PowerSupplypostregulators.Thepartsareavailable

•PCAdd-in-Cards

inTO-220,DDPAK/TO-263andSOPowerPAD-8

•LocalRegulatorsinSet-TopBoxes

packages.

•MicrocontrollerPowerSupplies

DropoutVoltage:140mV(typ)at1.5Aloadcurrent.

•HighEfficiencyPowerSupplies

GroundPinCurrent:3mA(typ)atfullload.

•SMPSPost-Regulators

ShutdownCurrent:60nA(typ)whenS/Dpinislow.

PrecisionOutputVoltage:1.5%roomtemperature

accuracy.

TYPICALAPPLICATIONCIRCUIT

Atleast10µFofinputandoutputcapacitanceisrequiredforstability.

*Tantalumcapacitorsarerecommended.Aluminumelectrolyticcapacitorsmaybeusedforrestrictedtemperature

range.Seeapplicationhints.

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Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2003–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer