Texas Instruments LP3921 Bedienungsanleitung

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LP3921

www.ti.com

SNVS580A–AUGUST2008–REVISEDMAY2013

LP3921BatteryChargerManagementandRegulatorUnitwithIntegratedBoomer™Audio

Amplifier

CheckforSamples:LP3921

1

FEATURES

DESCRIPTION

TheLP3921isafullyintegratedchargerandmulti-

23

•Charger

regulatorunitwithafullydifferentialBoomeraudio

–DCAdapterorUSBInput

poweramplifierdesignedforCDMAcellularphones.

–ThermallyRegulatedChargeCurrent

TheLP3921hasahigh-speedserialinterfacewhich

allowsfortheintegrationandcontrolofaLi-Ion

–UnderVoltageLockout

batterycharger,7low-noiselow-dropout(LDO)

–50to950mAProgrammableCharge

voltageregulatorsandaBoomeraudioamplifier.

Current

TheLi-IonchargerintegratesapowerFET,reverse

•3.0Vto5.5VInputVoltageRange

currentblockingdiode,senseresistorwithcurrent

•ThermalShutdown

monitoroutput,andrequiresonlyafewexternal

•I

2

C-CompatibleInterfaceforControlling

components.Chargingisthermallyregulatedto

obtainthemostefficientchargingrateforagiven

Charger,LDOOutputsandEnablingAudio

ambienttemperature.

Output

•LDO's7Low-NoiseLDO’s

LDOregulatorsprovidehighPSRRandlownoise

ideallysuitedforsupplyingpowertobothanalogand

–2x300mA

digitalloads.

–3x150mA

TheBoomerAudioAmplifieriscapableofdelivering

–2x80mA

1.1wattsofcontinuousaveragepowertoan8ΩBTL

2%(typ.)OutputVoltageAccuracyonLDO's

loadwithlessthan1%distortion(THD+N).Boomer

•Audio

AudioPowerAmplifiersweredesignedspecificallyto

–FullyDifferentialAmplificationprovidehighqualityoutputpowerwithaminimal

amountofexternalcomponents.TheBoomerAudio

–AbilitytoDriveCapacitiveLoadsupto100

Amplifierdoesnotrequireoutputcouplingcapacitors

pF

orbootstrapcapacitors,andthereforeisideallysuited

–NoOutputCouplingCapacitors,Snubber

formobilephoneandotherlowvoltageapplications

NetworksorBootstrapCapacitorsRequired

whereminimalpowerconsumptionandpartcountis

theprimaryrequirement.TheBoomerAudioAmplifier

•Space-Efficient32-pin5x5mmWQFN

containsadvancedpop&clickcircuitrywhich

Package

eliminatesnoisesduringturn-onandturn-off

transitions.

APPLICATIONS

•CDMAPhoneHandsets

•LowPowerWirelessHandsets

•HandheldInformationAppliances

•PersonalMediaPlayers

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Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2BoomerisatrademarkofTexasInstruments.

3Allothertrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2008–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspezifikationen