2024年4月19日发(作者：)

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LM4671

Filterless

High

Efficiency

2.5W

Switching

Audio

Amplifier

March2005

LM4671

FilterlessHighEfficiency2.5WSwitchingAudio

Amplifier

GeneralDescription

TheLM4671isasinglesupply,highefficiency2.5Wswitch-

ise,filterlessPWMarchitecture

eliminatestheoutputfilter,reducingexternalcomponent

count,boardareaconsumption,systemcost,andsimplifying

design.

TheLM4671isdesignedtomeetthedemandsofmobile

-

ingonasingle5Vsupply,itiscapableofdrivinga4Ω

speakerloadatacontinuousaverageoutputof2.1Wwith

lessthan1%THD+xiblepowersupplyrequirements

allowoperationfrom2.4Vto5.5V.

TheLM4671hashighefficiencywithspeakerloadscom-

3Vsupply

drivingan8Ωspeaker,theIC’sefficiencyfora100mW

powerlevelis80%,reaching88%at400mWoutputpower.

TheLM4671featuresalow-powerconsumptionshutdown

wnmaybeenabledbydrivingtheShutdown

pintoalogiclow(GND).

ThegainoftheLM4671isexternallyconfigurablewhich

allowsindependentgaincontrolfrommultiplesourcesby

summingthesignals.

KeySpecifications

j

Efficiencyat3.6V,100mWinto8Ωspeaker80%(typ)

j

Efficiencyat3.6V,400mWinto8Ωspeaker88%(typ)

j

Efficiencyat5V,1Winto8Ωspeakerr

j

Quiescentcurrent,3.6Vsupply

j

Totalshutdownpowersupplycurrent

j

Singlesupplyrange

86%(typ)

2.8mA(typ)

0.01µA(typ)

2.4Vto5.5V

Features

n

n

n

n

n

n

n

Nooutputfilterrequiredforinductiveloads

Externallyconfigurablegain

Veryfastturnontime:1ms(typ)

Minimumexternalcomponents

"Clickandpop"suppressioncircuitry

Micro-powershutdownmode

Availableinspace-savingmicroSMDpackage

Applications

nMobilephones

nPDAs

nPortableelectronicdevices

TypicalApplication

201073J3

lAudioAmplifierApplicationCircuit

Boomer

®

isaregisteredtrademarkofNationalSemiconductorCorporation.

©

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M

4

6

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ConnectionDiagrams

9BumpmicroSMDPackagemicroSMDMarking

201073C6

TopView

X—DateCode

T—DieTraceability

G—BoomerFamily

E7—LM4671ITL

20107336

TopView

OrderNumberLM4671ITL,LM4671ITLX

SeeNSPackageNumberTLA09AAA

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