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LP3881

www.ti.com

SNVS224F–MARCH2003–REVISEDAPRIL2013

LP38810.8AFast-ResponseUltraLowDropoutLinearRegulators

CheckforSamples:LP3881

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FEATURES

DESCRIPTION

TheLP3881isahighcurrent,fastresponseregulator

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•UltraLowDropoutVoltage(75mV@0.8ATyp)

whichcanmaintainoutputvoltageregulationwith

•LowGroundPinCurrent

minimuminputtooutputvoltagedrop.Fabricatedon

•LoadRegulationof0.04%/A

aCMOSprocess,thedeviceoperatesfromtwoinput

voltages:Vbiasprovidesvoltagetodrivethegateof

•60nATypicalQuiescentCurrentinShutdown

theN-MOSpowertransistor,whileVinistheinput

•1.5%OutputAccuracy(25°C)

voltagewhichsuppliespowertotheload.Theuseof

•TO-220,TO-263andSOIC-8Packages

anexternalbiasrailallowstheparttooperatefrom

ultralowVinvoltages.Unlikebipolarregulators,the

•OverTemperature/OverCurrentProtection

CMOSarchitectureconsumesextremelylow

•−40°Cto+125°CJunctionTemperatureRange

quiescentcurrentatanyoutputloadcurrent.Theuse

ofanN-MOSpowertransistorresultsinwide

APPLICATIONS

bandwidth,yetminimumexternalcapacitanceis

requiredtomaintainloopstability.

•DSPPowerSupplies

•ServerCoreandI/OSupplies

Thefasttransientresponseofthesedevicesmakes

themsuitableforuseinpoweringDSP,

•PCAdd-in-Cards

MicrocontrollerCorevoltagesandSwitchMode

•LocalRegulatorsinSet-TopBoxes

PowerSupplypostregulators.Thepartsareavailable

•MicrocontrollerPowerSupplies

inTO-220,TO-263andSOIC-8packages.

•HighEfficiencyPowerSupplies

DropoutVoltage:75mV(typ)@0.8Aloadcurrent.

•SMPSPost-Regulators

GroundPinCurrent:3mA(typ)atfullload.

ShutdownCurrent:60nA(typ)whenS/Dpinislow.

PrecisionOutputVoltage:1.5%roomtemperature

accuracy.

TYPICALAPPLICATIONCIRCUIT

Atleast4.7µFofinputandoutputcapacitanceisrequiredforstability.

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Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2003–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer