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LM3409/LM3409HVLM3409Q/LM3409QHVApril12,2010PFETBuckControllerforHighPowerLEDDrivesGeneralDescriptionTheLM3409/09HVareP-channelMosFET(PFET)con-trollersforstep-down(buck)currentregulators.Theyofferwideinputvoltagerange,high-sidedifferentialcurrentsensewithlowadjustablethresholdvoltage,fastoutputenable/dis-ablefunctionandathermallyenhancedeMSOP-10package.ThesefeaturescombinetomaketheLM3409/09HVidealforuseasconstantcurrentsourcesfordrivingLEDswherefor-wardcurrentsupto5Aareeasilyachievable.TheLM3409/09Q/09HV/09QHVusesConstantOff-Time(COFT)controltoregulateanaccurateconstantcurrentwithouttheneedforexternalcontrolloopcompensation.AnalogandPWMdimmingareeasytoimplementandresultinahighlylineardimmingrangewithexcellentachievablecontrastra-tios.ProgrammableUVLO,low-powershutdown,andthermalshutdowncompletethefeatureset.Features■LM3409Q/LM3409QHVisanAutomotiveGradeproductthatisAEC-Q100grade1qualified■2Ω,1APeakMosFETGateDrive■VINRange:6Vto42V(LM3409/LM3409Q)■VINRange:6Vto75V(LM3409HV/LM3409QHV)■Differential,High-sideCurrentSense■Cycle-by-CycleCurrentLimit■NoControlLoopCompensationRequired■10,000:1PWMDimmingRange■250:1AnalogDimmingRange■SupportsAll-CeramicOutputCapacitorsandCapacitor-lessOutputs■LowPowerShutdown■ThermalShutdownProtection■ThermallyEnhancedeMSOP-10PackageApplications■LEDDriver■ConstantCurrentSource■AutomotiveLighting■GeneralIllumination■IndustrialLightingTypicalApplication30085601©2010NationalSemiconductorCorporation300856*LM3409QMYXMUC10ASZDB3500UnitsontapeandreelLM3409QHVMYMUC10ASZEB1000UnitsontapeandreelLM3409QHVMYXMUC10ASZEB3500Unitsontapeandreel*AutomotiveGrade(Q)productincorporatesenhancedmanufacturingandsupportprocessesfortheautomotivemarket,includingdefectdetectionmethodologies.ReliabilityqualificationiscompliantwiththerequirementsandtemperaturegradesdefinedintheAEC-Q100standard.AutomotivegradeproductsareidentifiedwiththeletterQ.Formoreinformationgoto(s)NameDescriptionApplicationInformation1UVLOInputunder-voltagelockoutConnecttoaresistordividerfromVINandGND.Turn-onthresholdis1.24Vandhysteresisforturn-offisprovidedbya22µAcurrentsource.2IADJAnalogLEDcurrentadjustApplyavoltagebetween0-1.24V,connectaresistortoGND,orleaveopentosetthecurrentsensethresholdvoltage.3ENLogiclevelenable/PWMdimmingApplyavoltage1.74Vtoenabledevice,aPWMsignaltodim,oravoltage0.5Vforlowpowershutdown.4COFFOff-timeprogrammingConnectaresistorfromVO,andacapacitorfromGNDtosettheoff-time.5GNDGroundConnecttothesystemground.6PGATEGatedriveConnecttothegateoftheexternalPFET.7CSNNegativecurrentsenseConnecttothenegativesideofthesenseresistor.8CSPPositivecurrentsenseConnecttothepositivesideofthesenseresistor(alsoconnectedtoVIN).9VCCVIN-referencedlinearregulatoroutputConnectatleasta1µFceramiccapacitortoVIN.TheregulatorprovidespowerforthePFETdrive.10VINInputvoltageConnecttotheinputvoltage.DAPDAPThermalpadonbottomofICConnecttopin5(GND).Place4-6viasfromDAPtobottomlayerGNDplane.(Note1)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.VIN,EN,UVLOtoGND-0.3Vto45V(76VLM3409HV/09QHV)VINtoVCC,PGATE-0.3Vto7VVINtoPGATE-2.8Vfor100ns9.5Vfor100nsVINtoCSP,CSN-0.3Vto0.3VCOFFtoGND-0.3Vto4VCOFFcurrent±1mAcontinuousIADJCurrent±5mAcontinuousJunctionTemperature150°CStorageTemp.Range-65°Cto125°CESDRating(Note2)LM3409/09HV1kVLM3409Q/09QHV2kVSolderingInformationLeadTemperature(Soldering,10sec)260°CInfrared/ConvectionReflow(15sec)260°COperatingRatings(LM3409/09Q/09HV/09QHV)(Note1)VIN6Vto42V(75VLM3409HV/09QHV)JunctionTemperatureRange−40°Cto+125°CThermalResistanceθJA(eMSOP-10Package)(Note5)50°C/WElectricalCharacteristicsVIN=24Vunlessotherwiseindicated.TypicalsandlimitsappearinginplaintypeapplyforTA=TJ=+25°C(Note3).LimitsappearinginboldfacetypeapplyoverfullOperatingTemperatureRange.Datasheetmin/maxspecificationlimitsareguaranteedbydesign,test,orstatisticalanalysis.LM3409/09Q/09HV/09QHVSymbolParameterConditionsMin(Note4)Typ(Note3)Max(Note4)UnitsPEAKCURRENTCOMPARATORVCSTVCSP–VCSNaveragepeakcurrentthreshold(Note6)VADJ=1.0V188198208mVVADJ=VADJ-OC231246261AADJVADJtoVCSP–VCSNthresholdgain0.1VADJ1.2VVADJ=VADJ-OC0.2V/VVADJ-OCIADJpinopencircuitvoltage1.1891.2431.297VIADJIADJpincurrent3.856.4µAtDELCSNpinfallingdelayCSNfall-PGATErise38nsSYSTEMCURRENTSIINOperatingcurrentNotswitching2mAISDShutdownhysteresiscurrentEN=0V110µAPFETDRIVERRPGATEDriveroutputresistanceS
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