SGM6232 S_R52_20130123(1)

SGM62322A,38V,1.4MHzStep-DownConverterGENERALDESCRIPTIONTheSGM6232isacurrent-modestep-downregulatorwithaninternalpowerMOSFET.Thisdeviceachieves2Acontinuousoutputcurrentoverawideinputsupplyrangefrom4.5Vto38Vwithexcellentloadandlineregulations.TheswitchingfrequencyofSGM6232is1.4MHzandcurrentmodeoperationprovidesfasttransientresponseandeasesloopstabilization.TheSGM6232ishighlyefficientwithpeakefficiencyat91%wheninoperation.Inshutdownmodetheregulatordrawslessthan15µAofsupplycurrent.Protectionfeaturesincludecycle-by-cyclecurrentlimitandthermalshutdown.Thedevicealsoincludesaninternalsoft-startandanexternaladjustablesoft-startfunctiontolimittheinrushcurrentandpreventtheovershootofoutputvoltage.TheSGM6232isavailableinGreenSOIC-8(ExposedPad)packageandrequiresaminimumnumberofreadilyavailableexternalcomponentstocompletea2Astep-downDC/DCconvertersolution.FEATURES●2AOutputCurrent●HighEfficiency:Upto91%●4.5Vto38VInputVoltageRange●15µAShutdownSupplyCurrent●100mΩInternalPowerMOSFETSwitch●Fixed1.4MHzSwitchingFrequency●OutputAdjustablefrom0.8Vto28V●Cycle-by-CycleCurrentLimitProtection●ThermalShutdownProtection●Under-VoltageLockout●StablewithLowESRCeramicCapacitors●-40℃to+85℃OperatingTemperatureRange●AvailableinGreenSOIC-8(ExposedPad)PackageAPPLICATIONSDistributedPowerSystemsBatteryChargersFlatPanelTVsSet-TopBoxesPre-RegulatorforLinearRegulatorsCigaretteLighterPoweredDevicesDVD/PVRDevicesTYPICALAPPLICATIONINBSSWFBCOMPGNDSSENSGM6232C510nFINPUT4.5Vto38VOPEN=AUTOMATICSTARTUPOUTPUT3.3V/2AC40.1μFR310kΩR210.5kΩR133kΩL4.7μHC35.6nFCIN22μFCOUT47μFD1B340AC6OptionalJanuary31,2013SGMicroCorp(A)Efficiency(%)VOUT=5.0VVOUT=3.3VVIN=12VSGM62322A,38V,1.4MHzStep-DownConverter2SGMicroCorp(ExposedPad)-40°Cto+85°CSGM6232YPS8G/TRSGM6232YPS8XXXXXTapeandReel,2500NOTE:XXXXX=DateCodeandVendorCode.ABSOLUTEMAXIMUMRATINGSSupplyVoltageVIN...................................................-0.3Vto40VSWVoltageVSW.............................................-0.5VtoVIN+0.3VBoostVoltageVBS...................................VSW-0.3VtoVSW+6VAllOtherPins.............................................................-0.3Vto6VPackageThermalResistanceSOIC-8(ExposedPad),θJA.............................................50℃/WOperatingTemperatureRange............................-40°Cto+85°CJunctionTemperature........................................................150°CStorageTemperatureRange.............................-65°Cto+150°CLeadTemperature(Soldering,10s)...................................260°CESDSusceptibilityHBM...................................................................................4000VMM.......................................................................................200VNOTE:Stressesbeyondthoselistedunder“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationsisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.CAUTIONThisintegratedcircuitcanbedamagedbyESDifyoudon’tpayattentiontoESDprotection.SGMICROrecommendsthatallintegratedcircuitsbehandledwithappropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.SGMICROreservestherighttomakeanychangeincircuitdesign,specificationorotherrelatedthingsifnecessarywithoutnoticeatanytime.PleasecontactSGMICROsalesofficetogetthelatestdatasheet.SGM62322A,38V,1.4MHzStep-DownConverter3SGMicroCorp(TOPVIEW)312SOIC-8(ExposedPad)GNDBSSW46875INFBSSCOMPENGNDPINDESCRIPTIONPINNAMEFUNCTION1BSHigh-sideGateDriveBoostInput.BSsuppliesthedriverforthehigh-sideN-ChannelMOSFETswitch.Connecta10nForgreatercapacitorfromSWtoBStopowerthehigh-sideswitch.2INPowerInput.INsuppliesthepowertotheIC,aswellasthestep-downconverterswitches.DriveINwitha4.5Vto38Vpowersource.BypassINtoGNDwithasufficientlylargecapacitortoeliminatenoiseontheinputtotheIC.3SWPowerSwitchingOutput.SWistheswitchingnodethatsuppliespowertotheoutput.ConnecttheoutputLCfilterfromSWtotheoutputload.NotethatacapacitorisrequiredfromSWtoBStopowerthehigh-sideswitch.4GNDGround.(Connecttheexposedpadonbacksidetopin4.)5FBFeedbackInput.Thevoltageatthispinisregulatedto0.8V.Connectedtotheresistordividerbetweenoutputandgroundtosetoutputvoltage.6COMPCompensationNode.COMPisusedtocompensatetheregulationcontrolloop.ConnectaseriesRCnetworkfromCOMPtoGNDtocompensatetheregulationcontrolloop.Insomecases,anadditionalcapacitorfromCOMPtoGNDisrequired.7ENEnableInput.ENisadigitalinputthatturnstheregulatoronoroff.DriveENhig