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1、LTC3546DualSynchronous,3A/1Aor2A/2AConfigurableStep-DownDC/DCRegulatorFEATURESDESCRIPTIONnVINRange:2.25Vto5.5VTheLTC®3546isadual,constant-frequency,synchronousnVOUTRange:0.6Vto5VstepdownDC/DCconverterformediumpowerapplications.nProgrammableFrequencyOperation;2.25MHz,orThedesignconsist
2、sof2Aand1Aprimaryoutputswitches.AdjustableBetween0.75MHzto4MHzInadditiontothe2A/1Acapability,a1AdependantoutputnLowRDS(ON)InternalSwitchesswitchcanbeexternallyconnectedtoeitheroftheprimarynHighEfficiency:Upto96%outputstoproduce3A/1Adualregulatoror2A/2AdualnNoSchottkyDiodesRequiredregu
3、latorconfigurations.nShort-CircuitProtectedSupplyoperationisfrom2.25Vto5.5V.TheswitchingnCurrentModeOperationforExcellentLineandLoadfrequencycanbesetto2.25MHz,adjustable0.75MHztoTransientResponse4MHz,orsynchronizedtoanexternalclock.EachoutputnLowRippleBurstModeOperation(30mVP-P),isadj
4、ustablefrom0.6Vto5VandhasoutputtrackingIQ=160μAonpower-up.InternalsynchronouslowRDS(ON)powernUltralowShutdownCurrent:IQ<1μAswitchesprovidehighefficiencywithoutexternalSchottkynLowDropoutOperation:100%DutyCyclediodes.nPowerGoodOutputForEachChannelnExternallyorInternallyProgrammableBurs
5、tLevelUser-selectablemodes(BurstMode®operation,pulsenExternalorInternalSoft-StartorSupplyTrackingskippingandforcedcontinuous)allowtrade-offbetweennAvailableinThermallyEnhanced28-Leadripplenoiseandpowerefficiency.BurstModeoperation(4mm×5mm)QFNandTSSOPPackagesprovideshighefficiencyatligh
6、tloads.Pulse-skippingmodeprovideslowripplenoiseatlightloads.APPLICATIONSThedeviceiscapableoflowdropoutconfigurationsandbothchannelscanoperateat100%dutycycle.Inshut-nNetbooks/Ultra-MobilePCsdown,thedevicedraws<1μA.nPCCardsnWirelessandDSLModemsL,LT,LTC,LTM,LinearTechnology,theLinearlogo
7、andBurstModeareregisteredtrademarksofLinearTechnologyCorporation.AllothertrademarksarethepropertyoftheirrespectivenPointofLoadDC/DCConversionowners.ProtectedbyU.S.Patents,including5481178,6611131,6304066,6498466,6580258.TYPICALAPPLICATIONVIN2.25VTOCINVOUT2Efficiency(BurstModeOperation
8、)5.5V22μFVIN
