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OUT

S/D

OUT

GND

IN

BIAS

LP38841-

ADJ

IN

BIAS

5V ± 10%

GND

GND

0.1 PF

10 PF

Ceramic

S/D

ADJ

4.7 PF

*

C

FF

R1

R2

LP38841-ADJ

www.ti.com

SNVS305C–FEBRUARY2005–REVISEDAPRIL2013

LP38841-ADJ0.8AUltraLowDropoutAdjustableLinearRegulators

StablewithCeramicOutputCapacitors

CheckforSamples:LP38841-ADJ

1

FEATURES

DESCRIPTION

TheLP38841-ADJisahighcurrent,fastresponse

2

•IdealforConversionfrom1.8Vor1.5VInputs

regulatorwhichcanmaintainoutputvoltage

•DesignedforUsewithLowESRCeramic

regulationwithminimuminputtooutputvoltagedrop.

Capacitors

FabricatedonaCMOSprocess,thedeviceoperates

•UltraLowDropoutVoltage(75mV@0.8ATyp)

fromtwoinputvoltages:Vbiasprovidesvoltageto

drivethegateoftheN-MOSpowertransistor,while

•0.56Vto1.5VAdjustableOutputRange

Vinistheinputvoltagewhichsuppliespowertothe

•LoadRegulationof0.1%/A(Typ)

load.Theuseofanexternalbiasrailallowsthepart

•30nAQuiescentCurrentinShutdown(Typ)

tooperatefromultralowVinvoltages.Unlikebipolar

regulators,theCMOSarchitectureconsumes

•LowGroundPinCurrentatallLoads

extremelylowquiescentcurrentatanyoutputload

•OverTemperature/OverCurrentProtection

current.TheuseofanN-MOSpowertransistor

•Availablein8LeadSO

resultsinwidebandwidth,yetminimumexternal

capacitanceisrequiredtomaintainloopstability.

•−40°Cto+125°CJunctionTemperatureRange

•UVLODisablesOutputwhenV

BIAS

<3.8V

Thefasttransientresponseofthesedevicesmakes

themsuitableforuseinpoweringDSP,

MicrocontrollerCorevoltagesandSwitchMode

APPLICATIONS

PowerSupplypostregulators.Thepartsareavailable

•ASICPowerSuppliesIn:

intheSOpackage.

–Desktops,Notebooks,andGraphicsCards,

DropoutVoltage:75mV(typ)@0.8Aloadcurrent.

Servers

QuiescentCurrent:30mA(typ)atfullload.

–GamingSetTopBoxes,Printersand

Copiers

ShutdownCurrent:30nA(typ)whenS/Dpinislow.

•ServerCoreandI/OSupplies

PrecisionReferenceVoltage:1.5%room

•DSPandFPGAPowerSupplies

temperatureaccuracy.

•SMPSPost-Regulators

TypicalApplicationCircuit

*MinimumvaluerequiredifTantalumcapacitorisused(seeAPPLICATIONHINTS).

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2005–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer