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EN

V

EN

IN

BIAS

GND

OUT

V

OUT

V

IN

V

BIAS

C

IN

10 PF Ceramic

C

OUT

10 PF

Ceramic

C

BIAS

1 PF

GND

GND

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LP38856

SNVS336F–JUNE2006–REVISEDAUGUST2015

LP388563-AFast-ResponseHigh-AccuracyLDOLinearRegulatorWithEnable

1Features3Description

TheLP38856isahigh-current,fast-response

1

•InputVoltage:1.1Vto5.5V

regulatorwhichcanmaintainoutputvoltage

•WideV

BIAS

SupplyOperatingRange:3Vto5.5V

regulationwithanextremelylowinput-to-output

•StandardV

OUT

:0.8Vand1.2V

voltagedrop.FabricatedonaCMOSprocess,the

deviceoperatesfromtwoinputvoltages:V

BIAS

•Stablewith10-µFCeramicCapacitors

providespowerfortheinternalbiasandcontrol

•DropoutVoltageof240mV(Typical)at3-ALoad

circuits,aswellasdriveforthegateoftheN-MOS

Current

powertransistor,whileV

IN

suppliespowertotheload.

•PrecisionOutputVoltageAcrossAllLineand

Theuseofanexternalbiasrailallowsthepartto

LoadConditions:

operatefromultra-lowV

IN

voltages.Unlikebipolar

regulators,theCMOSarchitectureconsumes

–±1%forT

J

=25°C

extremelylowquiescentcurrentatanyoutputload

–±2%for0°C≤T

J

≤+125°C

current.TheuseofanN-MOSpowertransistor

–±3%for–40°C≤T

J

≤+125°C

resultsinwidebandwidth,yetminimumexternal

capacitanceisrequiredtomaintainloopstability.

•OvertemperatureandOvercurrentProtection

•–40°Cto+125°COperatingTemperatureRange

Thefasttransientresponseofthisdevicemakesit

suitableforuseinpoweringDSP,microcontrollercore

voltages,andswitchmodepowersupplypost

2Applications

regulators.TheLP38856isavailablein5-pinTO-220

•ASICPowerSuppliesIn:

andDDPAK/TO-263packages.

–Desktops,Notebooks,andGraphicsCards,

•DropoutVoltage:240mV(typical)at3-Aload

Servers

current.

–GamingSetTopBoxes,PrintersandCopiers

•LowGroundPinCurrent:10mA(typical)at3-A

loadcurrent.

•ServerCoreandI/OSupplies

•ShutdownCurrent:1µA(typical)I

IN(GND)

whenEN

•DSPandFPGAPowerSupplies

pinislow.

•SMPSPost-Regulator

•PrecisionOutputVoltage:±1%forT

J

=25°Cand

±2%for0°C≤T

J

≤+125°C,acrossalllineand

loadconditions.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

DDPAK/TO-263(5)10.16mm×8.42mm

LP38856

TO-220(5)14.986mm×10.16mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

TypicalApplicationCircuit

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Produktspecifikationer