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LP3891

www.ti.com

SNVS235D–SEPTEMBER2003–REVISEDAPRIL2013

LP38910.8AFast-ResponseUltraLowDropoutLinearRegulators

CheckforSamples:LP3891

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FEATURES

DESCRIPTION

TheLP3891isahighcurrent,fastresponseregulator

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•UltraLowDropoutVoltage(100mVat0.8Atyp)

whichcanmaintainoutputvoltageregulationwith

•LowGroundPinCurrent

minimuminputtooutputvoltagedrop.Fabricatedon

•LoadRegulationof0.04%/A

aCMOSprocess,thedeviceoperatesfromtwoinput

voltages:Vbiasprovidesvoltagetodrivethegateof

•60nATypicalQuiescentCurrentinShutdown

theN-MOSpowertransistor,whileVinistheinput

•1.5%OutputAccuracy(25°C)

voltagewhichsuppliespowertotheload.Theuseof

•TO-220,DDPAK/TO-263andSOPowerPAD-8

anexternalbiasrailallowstheparttooperatefrom

Packages

ultralowVinvoltages.Unlikebipolarregulators,the

CMOSarchitectureconsumesextremelylow

•OverTemperature/OverCurrentProtection

quiescentcurrentatanyoutputloadcurrent.Theuse

•−40°Cto+125°CJunctionTemperatureRange

ofanN-MOSpowertransistorresultsinwide

bandwidth,yetminimumexternalcapacitanceis

APPLICATIONS

requiredtomaintainloopstability.

•DSPPowerSupplies

Thefasttransientresponseofthesedevicesmakes

•ServerCoreandI/OSupplies

themsuitableforuseinpoweringDSP,

MicrocontrollerCorevoltagesandSwitchMode

•PCAdd-in-Cards

PowerSupplypostregulators.Thepartsareavailable

•LocalRegulatorsinSet-TopBoxes

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

•MicrocontrollerPowerSupplies

packages.

•HighEfficiencyPowerSupplies

DropoutVoltage:100mV(typ)at0.8Aloadcurrent.

•SMPSPost-Regulators

GroundPinCurrent:3mA(typ)atfullload.

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