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IN

BIAS

GND

OUT

V

OUT

V

IN

V

BIAS

C

IN

C

OUT

C

BIAS

GND

GND

LP38853

ADJ

R1

R2

C

FF

V

EN

SS

C

SS

EN

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LP38853

SNVS335F–DECEMBER2006–REVISEDNOVEMBER2016

LP388533-AFast-ResponseHigh-AccuracyAdjustableLDOLinearRegulator

WithEnableandSoftStart

1

1Features

1

•WideV

BIAS

SupplyOperatingRange:3Vto5.5V

•AdjustableV

OUT

Range:0.8Vto1.8V

•DropoutVoltageof240mV(Typical)at3-ALoad

Current

•PrecisionV

ADJ

AcrossAllLineandLoad

Conditions:

–±1.5%V

ADJ

forT

J

=25°C

–±2%V

ADJ

for0°C≤T

J

≤+125°C

–±3%V

ADJ

for–40°C≤T

J

≤+125°C

•OvertemperatureandOvercurrentProtection

•Stablewith10-µFCeramicCapacitors

•−40°Cto+125°COperatingJunctionTemperature

Range

2Applications

•ASICPowerSuppliesin:

–Desktops,Notebooks,GraphicsCards,and

Servers

–GamingSet-TopBoxes,Printers,andCopiers

•ServerCoreandI/OSupplies

•DSPandFPGAPowerSupplies

•SMPSPost-Regulator

3Description

TheLP38853isahigh-current,fast-response

regulatorthatcanmaintainoutputvoltageregulation

withextremelylowinput-to-outputvoltagedrop.

FabricatedonaCMOSprocess,thedeviceoperates

fromtwoinputvoltages:V

BIAS

providesvoltageto

drivethegateoftheNMOSpowertransistor;V

IN

is

theinputvoltagewhichsuppliespowertotheload.

Theuseofanexternalbiasrailallowsthedeviceto

operatefromultra-lowV

IN

voltages.Unlikebipolar

regulators,theCMOSarchitectureconsumes

extremelylowquiescentcurrentatanyoutputload

current.TheuseofanNMOSpowertransistorresults

inwidebandwidth,yetminimumexternalcapacitance

isrequiredtomaintainloopstability.

Thefasttransientresponseofthisdevicemakesit

suitableforuseinpoweringDSPandmicrocontroller

corevoltages,andswitch-modepower-supplypost

regulators.

•DropoutVoltage:240mV(typical)at3-Aload

current

•LowGroundPinCurrent:10mA(typical)at3-A

loadcurrent

•SoftStart:Programmablesoft-starttime

DeviceInformation

(1)

PART

NUMBER

PACKAGEBODYSIZE(NOM)

LP38853

DDPAK/TO-263(7)10.10mm×8.89mm

TO-220(7)14.986×10.16mm

SOPowerPAD™(8)4.89mm×3.90mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedSchematic

Produktspecifikationer