Texas Instruments LP38869 Bedienungsanleitung

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1 PF

ON-

OFF-

V

OUT

1 PF

LP38869

OUT

OUT

OUT

OUT

SET

GND

IN

IN

IN

IN

SS

SHDN

RST

DAP

RESET

V

IN

C

SS

LP38869

www.ti.com

SNVS877B–AUGUST2012–REVISEDAPRIL2013

LP388691AFlexCap,Low-DropoutLinearRegulatorwith0.75%Accuracy

CheckforSamples:LP38869

1

FEATURES

DESCRIPTION

TheLP38869low-dropoutlinearregulatoroperates

2

•OperatingInputSupplyRange:+2.7Vto+5.5V

withaninputvoltagesupplyfrom+2.7Vto+5.5V

•MaximumContinuousOutputCurrent:1A

input,anddeliversaspecified1Aloadcurrentwitha

•PresetOutputVoltageof2.5V,orAdjustable

low200mVdropout.Thehigh50dBPSRRat100

OutputVoltageFrom0.8Vto5.0V

kHzresultsfromahighgaincontrolloopthatalso

yieldsexcellenttransientresponse.Coupledwitha

•Pre-SetOutputInitialV

OUT

Tolerance±0.5%

highaccuracyoutputvoltage,±0.75%over

•AdjustableV

REF

Toleranceof±0.75%

temperature,theLP38869isanidealpowersupply

•PSRRof50dBat100kHz

forFPGAs,DSPsorMCUs.Outputvoltageispreset

at+2.5V,ormaybeadjustablebetween+0.8Vto+5V

•Low200mVDropoutat1A

withanexternalresistordivider.

•Typical2µASupplyCurrentinShutdown

TheLP38869onlyneeds1μFoutputcapacitancefor

Mode

stability.TheFlexCapcompensationallowstheuseof

•AdjustableSoft-StartforOutputCurrent

anytypeofoutputcapacitor,regardlessofESR.

•Fold-BackOutputCurrentLimit

Otherfeaturesinclude:Soft-Start;delayedreset

•StableWithCeramic,Tantalum,orAluminum

output;low-powershutdown;short-circuitprotection;

andthermalshutdownprotection

Capacitors

•StableWith1uFInput/OutputCapacitors

GroundPinCurrent:Typicallylessthan1mAat1A

load

•ThermalShutdown

•16-pinHTSSOPPackage

ShutdownMode:Typically2µAquiescentcurrent

whentheSHDNpinispulledlow.

APPLICATIONS

SimplifiedCompensation:Stablewithanytypeof

outputcapacitor.

•DSA,FPGAandMCUPowerSupply

•SMPSPost-Regulator

•ApplicationsRequiringSequencing

•GibabitSERDESTerminationSupply

TypicalApplicationCircuit

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2012–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

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