BUCK电源芯片 LT3845

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1、LT3845AHighVoltageSynchronousCurrentModeStep-Down断续电流模式有防止电感电流反向的功能。ControllerwithAdjustableOperatingFrequencyFEATURESDESCRIPTIONnHighVoltageOperation:Upto60VTheLT®3845Aisahighvoltage,synchronous,currentnSynchronizableUpto600kHzmodecontrollerusedformediumtohi

2、ghpower,highnAdjustableConstantFrequency:100kHzto500kHzefficiencysupplies.Itoffersawide4Vto60VinputrangenOutputVoltagesUpto36V(7.5Vminimumstart-upvoltage).AnonboardregulatornStableOperationinCurrentLimitsimplifiesthebiasingrequirementsbyprovidingICpowernAdapt

3、iveNonoverlapCircuitryPreventsSwitchdirectlyfromVIN.Shoot-Through®BurstModeoperationmaintainshighefficiencyatlightnReverseInductorCurrentInhibitforDiscontinuousloadsbyreducingICquiescentcurrentto120µA.LightloadOperationImprovesEfficiencywithLightLoadsefficien

4、cyisalsoimprovedwiththereverseinductorcurrentnProgrammableSoft-Startinhibitfunctionwhichsupportsdiscontinuousoperation.n120µANoLoadQuiescentCurrentn10µAShutdownSupplyCurrentAdditionalfeaturesincludeadjustablefixedoperatingn1%RegulationAccuracyfrequencythatcan

5、besynchronizedtoanexternalclocknStandardGateN-ChannelPowerMOSFETsfornoisesensitiveapplications,gatedriverscapableofnReverseOvercurrentProtectiondrivinglargeN-channelMOSFETs,aprecisionundervoltagen16-LeadThermallyEnhancedTSSOPPackagelockout,10µAshutdowncurrent

6、,short-circuitprotectionandaprogrammablesoft-start.APPLICATIONSTheLT3845Aisavailableina16-leadthermallyenhancedn12Vand42VAutomotiveandHeavyEquipmentTSSOPpackage.n48VTelecomPowerSuppliesL,LT,LTC,LTM,BurstMode,LinearTechnologyandtheLinearlogoareregisteredtradem

7、arksofnAvionicsandIndustrialControlSystemsLinearTechnologyCorporation.Allothertrademarksarethepropertyoftheirrespectiveowners..ProtectedbyU.S.Patents,including5481178,6611131,6304066,6498466,6580258.nDistributedPowerConvertersTYPICALAPPLICATIONHighVoltageStep

8、-DownRegulator48Vto12Vat75WEfficiencyandPowerLossVINvsLoadCurrent20VTO55V2.2µF0.1µF1007100V1MVIN=48VVINBOOST47µF95663VSHDNTGSi7370DP1500pFLT3845ABAS52115µH0.008VOUT905POWERLOSS(W)82.5kCS