Texas Instruments LM4674A Handleiding

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LM4674A

www.ti.com

SNAS366A–SEPTEMBER2006–REVISEDMAY2013

LM4674AFilterless2.5WStereoClassDAudioPower

Amplifier

CheckforSamples:LM4674A

1

FEATURES

DESCRIPTION

TheLM4674Aisasinglesupply,highefficiency,

2

•OutputShortCircuitProtection

2.5W/channel,filterlessswitchingaudioamplifier.A

•StereoClassDOperation

lownoisePWMarchitectureeliminatestheoutput

•NoOutputFilterRequired

filter,reducingexternalcomponentcount,boardarea

consumption,systemcost,andsimplifyingdesign.

•LogicSelectableGain

•IndependentShutdownControl

TheLM4674Aisdesignedtomeetthedemandsof

mobilephonesandotherportablecommunication

•MinimumExternalComponents

devices.Operatingfromasingle5Vsupply,the

•ClickandPopSuppression

deviceiscapableofdelivering2.5W/channelof

•Micro-PowerShutdown

continuousoutputpowertoa4Ωloadwithlessthan

10%THD+N.Flexiblepowersupplyrequirements

•AvailableinSpace-Saving2mmx2mmx

allowoperationfrom2.4Vto5.5V.

0.6mmDSBGAPackage

TheLM4674Afeatureshighefficiencycomparedto

APPLICATIONS

conventionalClassABamplifiers.Whendrivingan

8Ωspeakerfroma3.6Vsupply,thedevicefeatures

•MobilePhones

85%efficiencyatP

O

=500mW.Fourgainoptionsare

•PDAs

pinselectablethroughtheGAIN0andGAIN1pins.

•Laptops

Outputshortcircuitprotectionpreventsthedevice

frombeingdamagedduringfaultconditions.Superior

KEYSPECIFICATIONS

clickandpopsuppressioneliminatesaudible

transientsonpower-up/downandduringshutdown.

•Efficiencyat3.6V,100mWinto8Ω80%(typ)

Independentleft/rightshutdowncontrolsmaximizes

•Efficiencyat3.6V,500mWinto8Ω85%(typ)

powersavingsinmixedmono/stereoapplications.

•Efficiencyat5V,1Winto8Ω85%(typ)

•QuiescentPowerSupplyCurrentat3.6V

Supply4mA

•PowerOutputatV

DD

=5V,R

L

=4Ω,THD≤10%

2.5W(typ)

•PowerOutputatV

DD

=5V,R

L

=8Ω,THD≤10%

1.5W(typ)

•ShutdownCurrent0.1μA(typ)

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2006–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties