Texas Instruments LP38842 Bedienungsanleitung

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OUT

S/D

0.1 PF

10 PF

Ceramic

OUT

S/D

GND

IN

BIAS

LP38842

IN

BIAS

5V ± 10%

GND

GND

4.7 PF*

LP38842

www.ti.com

SNVS291C–DECEMBER2004–REVISEDAPRIL2013

LP388421.5AUltraLowDropoutLinearRegulators

StablewithCeramicOutputCapacitors

CheckforSamples:LP38842

1

FEATURES

DESCRIPTION

TheLP38842isahighcurrent,fastresponse

2

•IdealforConversionfrom1.8Vor1.5VInputs

regulatorwhichcanmaintainoutputvoltage

•DesignedforusewithlowESRCeramic

regulationwithminimuminputtooutputvoltagedrop.

Capacitors

FabricatedonaCMOSprocess,thedeviceoperates

•0.8V,1.2Vand1.5VStandardVoltages

fromtwoinputvoltages:Vbiasprovidesvoltageto

drivethegateoftheN-MOSpowertransistor,while

Available

Vinistheinputvoltagewhichsuppliespowertothe

•UltraLowDropoutVoltage(115mVat1.5Atyp)

load.Theuseofanexternalbiasrailallowsthepart

•1.5%InitialOutputAccuracy

tooperatefromultralowVinvoltages.Unlikebipolar

•LoadRegulationof0.1%/A(typical)

regulators,theCMOSarchitectureconsumes

extremelylowquiescentcurrentatanyoutputload

•30nAQuiescentCurrentinShutdown(typical)

current.TheuseofanN-MOSpowertransistor

•LowGroundPinCurrentatallLoads

resultsinwidebandwidth,yetminimumexternal

•OverTemperature/OverCurrentProtection

capacitanceisrequiredtomaintainloopstability.

•Availablein5LeadTO-220andDDPAK/TO-263

Thefasttransientresponseofthesedevicesmakes

Packages

themsuitableforuseinpoweringDSP,

MicrocontrollerCorevoltagesandSwitchMode

•−40°Cto+125°CJunctionTemperatureRange

PowerSupplypostregulators.Thepartsareavailable

inTO-220andDDPAK/TO-263packages.

APPLICATIONS

DropoutVoltage:115mV(typ)at1.5Aloadcurrent.

•ASICPowerSuppliesIn:

–Desktops,Notebooks,andGraphicsCards,

QuiescentCurrent:30mA(typ)atfullload.

Servers

ShutdownCurrent:30nA(typ)whenS/Dpinislow.

–GamingSetTopBoxes,Printersand

PrecisionOutputVoltage:1.5%roomtemperature

Copiers

accuracy.

•ServerCoreandI/OSupplies

•DSPandFPGAPowerSupplies

•SMPSPost-Regulator

TYPICALAPPLICATIONCIRCUIT

*MinimumvaluerequiredifTantalumcapacitorisused(seeApplicationHints).

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Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2004–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

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