LV2841_Datasheet

LV2841/2@2012TexasInstrumentsIncorporatedLV2841/2HighEfficiencyWideInputVoltageRangeBuckRegulatorTypicalApplicationCircuitEfficiencyvs.LightLoadCurrent(Fsw=2.1MHz,Vin=18V/Vout=12V)FeaturesInputRange4Vto40Vwith45VTransients1.1MHz(X)or2.1MHz(Y)SwitchingFrequencyHighEfficiencyforLightLoadwithEcoModeLowDropoutOperationOutputCurrentOptionsof300mAand600mAHighVoltageEnableInputFixedOutputVoltageOption(5V)OverCurrentProtectionOverTemperatureProtectionInternalCompensationSoftStartCircuitrySmallOverallSolutionSize(TSOT-6LPackage)DescriptionTheLV2841andLV2842arePWMDC/DCbuck(step-down)regulators.Withawideinputrangefrom4V-40V,theyaresuitableforawiderangeofapplicationfromindustrialtoautomotiveforpowerconditioningfromunregulatedsource.Theregulator’sstandbycurrentis26µAforsleepmode,whichissuitableforbatteryoperatingsystems.Anultralow1uAcurrentcanfurtherprolongbatterylifeinshutdownmode.Operatingfrequencyisfixedat1.1MHz(Xversion)and2.1MHz(Yversion)allowingtheuseofsmallexternalcomponentswhilestillbeingabletohavelowoutputripplevoltage.Soft-startandcompensationcircuitsareimplementedinternally,andtheseallowthedevicetobeusedwithminimizedexternalcomponents.TheLV2842isoptimizedforupto600mAloadcurrentswhiletheLV2841isoptimizedforupto300mAloadcurrent.Theyallhavea0.765Vnominalfeedbackvoltage.Thedevicehasbuilt-inprotectionfeaturessuchaspulsebypulsecurrentlimit,thermalsensingandshutdownduetoexcessivepowerdissipation.TheLV2841andLV2842areavailableinalowprofileTSOT-6Lpackage.ApplicationsPowerMeterIndustrialDistributedPowerApplicationsAutomotiveBatteryPoweredEquipmentPortableHandheldInstrumentsSWCBFBLV2841/2SHDNVINUpto40VVIN5V,0.3/0.6AGNDFixed5VoutputoptionavailableCinCoutL1D1CbootR1R2LV2841/2@2012TexasInstrumentsIncorporatedPartOrderingInformationX=1.1MHz,Y=2.1MHzSwitchingfrequencyOrderNumberPackageSVAPackageDrawingPackageDrawingSuppliedAsLV2841XMKTSOT-6MK06ATBD1000UnitsonTapeandReelLV2841XMKXTBD3000UnitsonTapeandReelLV2841YMKTBD1000UnitsonTapeandReelLV2841YMKXTBD3000UnitsonTapeandReelLV2842XMKTBD1000UnitsonTapeandReelLV2842XMKXTBD3000UnitsonTapeandReelLV2842YMKTBD1000UnitsonTapeandReelLV2842YMKXTBD3000UnitsonTapeandReelABSOLUTEMAXIMUMRATINGS(1)NO.DESCRIPTIONVALUEUNIT1.1VIN,/SHDNUnregulatedinputs45V1.2FBSensevoltageforerroramplifiers5.5V1.3SWSwitchpointforbuckconverter45-2Vfor30nSV1.4CBBootstrapcapacitorvoltage50V1.5ESD(2)ElectrostaticDischargeHBM2kV1.6TopOperatingambienttemperature-40to125°C1.7TSStorageTemperatureRange-55to165°C1.8TJOperatingjunctiontemperaturerange-40to150°CNote(1):Stressesbeyondthoselistedunder“absolutemaximumratings”maycausepermanentdamagetothedevice.Thesearestressratingsonlyandfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder“recommendedoperatingconditions”isnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.Note(2):Thehumanbodymodelisa100pFcapacitordischargedthrougha1.5kresistorintoeachpinTHERMALINFORMATIONTHERMALMETRICVALUEUNITJA(3)Junction-to-ambientthermalresistance121°C/WJC(4)Junction-to-casethermalresistance94°C/WJT(4)Junction-to-topcharacterizationparameter°C/WJB(4)Junction-to-boardcharacterizationparameter°C/WRECOMMEDEDOPERATINGCONDITIONSFUNCTIONTERMINALVALUEUNITBuckRegulatorVIN4to40VCB3.8to45VSW-1to40VFB0to5VControl/SHDN0to40VNote(3):ThisassumesaJEDECJESD51-5standardboardwiththermalvias–SeePowerPadsectionandapplicationnotefromTexasInstrumentsSLMA002formoreinformation.Note(4):ThisassumesjunctiontoexposedPAD.LV2841/2@2012TexasInstrumentsIncorporatedElectricalcharacteristicsVIN=6Vto27V,/SHDN=VIN,TJ=-40°Cto150°C,unlessotherwisenoted.TypicalvaluesareatTA=25°C.1.0#TestPARAMETERTESTCONDITIONSMinTypMaxUnit1.1VIN(InputPowerSupply)1.2InfoOperatinginputvoltage440V1.3PTShutdownsupplycurrentEN=0V,25°C12µA1.4CTUndervoltagelockoutthresholdsOnthreshold3.5V1.5CTHysteresis0.31.6PTDeviceon:notswitchingVFB=0.765V,VIN=12V,25°C26µA1.7PTDeviceon:notswitchingFixed5Vversion,VIN=12V,25°C31µA1.8ENABLEANDUVLO(/SHDNPIN)1.9PTEnableThresholdvoltageNovoltagehysteresis,risingandfalling,25°C1.151.251.36V1.10PTInputcurrentEnablethreshold+50mV–4.2µA1.11PTEnablethresh