Texas Instruments LP38851 Bruksanvisning

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LP38851

www.ti.com

SNVS492C–JUNE2007–REVISEDAPRIL2013

LP38851800mAFast-ResponseHigh-AccuracyAdjustableLDOLinearRegulatorwith

EnableandSoft-Start

CheckforSamples:LP38851

1

FEATURES

DESCRIPTION

TheLP38851-ADJisahighcurrent,fastresponse

2

•AdjustableV

OUT

Rangeof0.80Vto1.8V

regulatorwhichcanmaintainoutputvoltage

•WideV

BIAS

SupplyOperatingRangeof3.0Vto

regulationwithextremelylowinputtooutputvoltage

5.5V

drop.FabricatedonaCMOSprocess,thedevice

•Stablewith10µFCeramicCapacitors

operatesfromtwoinputvoltages:V

BIAS

provides

voltagetodrivethegateoftheN-MOSpower

•DropoutVoltageof115mV(Typical)at800mA

transistor,whileV

IN

istheinputvoltagewhich

LoadCurrent

suppliespowertotheload.Theuseofanexternal

•PrecisionV

ADJ

acrossAllLineandLoad

biasrailallowstheparttooperatefromultralowV

IN

Conditions:

voltages.Unlikebipolarregulators,theCMOS

architectureconsumesextremelylowquiescent

–±1.5%V

ADJ

forT

J

=25°C

currentatanyoutputloadcurrent.TheuseofanN-

–±2.0%V

ADJ

for0°C≤T

J

≤+125°C

MOSpowertransistorresultsinwidebandwidth,yet

–±3.0%V

ADJ

for-40°C≤T

J

≤+125°C

minimumexternalcapacitanceisrequiredtomaintain

•Over-TemperatureandOver-Currentloopstability.

Protection

Thefasttransientresponseofthisdevicemakesit

•Availablein8-LeadSOPowerPad,

suitableforuseinpoweringDSP,Microcontroller

7-LeadSFMand7-LeadPFMPackages

CorevoltagesandSwitchModePowerSupplypost

regulators.ThepartisavailableinPSOP8–pin,SFM

•−40°Cto+125°COperatingJunction

7–pin,andTO-2637-pinpackages.

TemperatureRange

•DropoutVoltage:115mV(typical)at800mA

loadcurrent

APPLICATIONS

•LowGroundPinCurrent:10mA(typical)at800

•ASICPowerSuppliesin:

mAloadcurrent

–Desktops,Notebooks,andGraphicsCards,

•Soft-Start:ProgrammableSoft-Starttime

Servers

•PrecisionADJVoltage:±1.5%forT

J

=25°C,

–GamingSetTopBoxes,Printersand

and±2.0%for0°C≤T

J

≤+125°C,acrossallline

Copiers

andloadconditions

•ServerCoreandI/OSupplies

•DSPandFPGAPowerSupplies

•SMPSPost-Regulator

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2007–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer