Texas Instruments LP38858 Bruksanvisning

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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

LP38858-x.x

C

SS

LP38858

www.ti.com

SNVS462D–OCTOBER2006–REVISEDAPRIL2013

1.5AFast-ResponseHigh-AccuracyLDOLinearRegulatorwithSoft-Start

CheckforSamples:LP38858

1

FEATURES

DESCRIPTION

TheLP38858isahighcurrent,fastresponse

2

•StandardV

OUT

Valuesof0.8Vand1.2V

regulatorwhichcanmaintainoutputvoltage

•WideV

BIAS

SupplyOperatingRangeof3.0Vto

regulationwithextremelylowinputtooutputvoltage

5.5V

drop.FabricatedonaCMOSprocess,thedevice

•Stablewith10µFCeramicCapacitors

operatesfromtwoinputvoltages:V

BIAS

provides

voltagetodrivethegateoftheN-MOSpower

•DropoutVoltageof130mV(Typical)at1.5A

transistor,whileV

IN

istheinputvoltagewhich

LoadCurrent

suppliespowertotheload.Theuseofanexternal

•PrecisionOutputVoltageacrossAllLineand

biasrailallowstheparttooperatefromultralowV

IN

LoadConditions:

voltages.Unlikebipolarregulators,theCMOS

architectureconsumesextremelylowquiescent

–±1.0%V

OUT

forT

J

=25°C

currentatanyoutputloadcurrent.TheuseofanN-

–±2.0%V

OUT

for0°C≤T

J

≤+125°C

MOSpowertransistorresultsinwidebandwidth,yet

–±3.0%V

OUT

for-40°C≤T

J

≤+125°C

minimumexternalcapacitanceisrequiredtomaintain

•Over-TemperatureandOver-Currentloopstability.

Protection

Thefasttransientresponseofthisdevicemakesit

•Availablein5LeadTO-220andDDPAK/TO-263

suitableforuseinpoweringDSP,Microcontroller

Packages

CorevoltagesandSwitchModePowerSupplypost

regulators.TheLP38858isavailableinTO-220and

•CustomV

OUT

Valuesbetween0.8Vand1.2V

DDPAK/TO-2635-Leadpackages.

areAvailable

DropoutVoltage:130mV(typical)at1.5Aload

•−40°Cto+125°COperatingTemperatureRange

current.

APPLICATIONS

LowGroundPinCurrent:10mA(typical)at1.5A

loadcurrent.

•ASICPowerSuppliesIn:

–Desktops,Notebooks,andGraphicsCards,

Soft-Start:ProgrammableSoft-Starttime.

Servers

PrecisionOutputVoltage:±1.0%forT

J

=25°Cand

–GamingSetTopBoxes,Printersand

±2.0%for0°C≤T

J

≤+125°C,acrossalllineandload

Copiers

conditions

•ServerCoreandI/OSupplies

•DSPandFPGAPowerSupplies

•SMPSPost-Regulator

TypicalApplicationCircuit

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2006–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer