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SS

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

LP38859-x.x

C

SS

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LP38859

SNVS337F–JUNE2006–REVISEDSEPTEMBER2015

LP388593-AFast-ResponseHigh-AccuracyLDOLinearRegulatorWithSoftStart

1Features3Description

TheLP38859isahigh-current,fast-response

1

•InputVoltage:1.1Vto5.5V

regulatorwhichcanmaintainoutputvoltage

•WideV

BIAS

SupplyOperatingRange:3Vto5.5V

regulationwithextremelylowinputtooutputvoltage

•StandardV

OUT

Values:0.8Vand1.2V

drop.FabricatedonaCMOSprocess,thedevice

operatesfromtwoinputvoltages:V

BIAS

provides

•StableWith10-µFCeramicCapacitors

voltagetodrivethegateoftheN-MOSpower

•DropoutVoltageof240mV(typical)at3-ALoad

transistor,whileV

IN

istheinputvoltagewhich

Current

suppliespowertotheload.Theuseofanexternal

•ProgrammableSoft-StartTime

biasrailallowstheparttooperatefromultra-lowV

IN

voltages.Unlikebipolarregulators,theCMOS

•PrecisionOutputVoltageAcrossAllLineand

architectureconsumesextremelylowquiescent

LoadConditions:

currentatanyoutputloadcurrent.TheuseofanN-

–±1%V

OUT

forT

J

=25°C

MOSpowertransistorresultsinwidebandwidth,yet

–±2%V

OUT

for0°C≤T

J

≤+125°C

minimumexternalcapacitanceisrequiredtomaintain

loopstability.

–±3%V

OUT

for–40°C≤T

J

≤+125°C

•OvertemperatureandOvercurrentProtection

Thefasttransientresponseofthisdevicemakesit

suitableforuseinpoweringDSPmicrocontrollercore

•OperatingTemperatureRange:−40°Cto+125°C

voltagesandswitch-modepower-supplypost-

regulators.TheLP38859isavailablein5-pinTO-220

2Applications

andDDPAK/TO-263packages.

•ASICPowerSuppliesIn:

DeviceInformation

(1)

–Desktops,Notebooks,GraphicsCards,and

PART

Servers

PACKAGEBODYSIZE(NOM)

NUMBER

–GamingSetTopBoxes,Printers,andCopiers

DDPAK/TO-263(5)10.16mm×8.42mm

LP38859

•ServerCoreandI/OSupplies

TO-220(5)14.986mm×10.16mm

•DSPandFPGAPowerSupplies

(1)Forallavailablepackages,seetheorderableaddendumat

•SMPSPost-Regulator

theendofthedatasheet.

TypicalApplicationCircuit

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Produktspecifikationer