LTC3789

LTC378913789fTYPICALAPPLICATIONFEATURESAPPLICATIONSDESCRIPTIONHighEfficiency,Synchronous,4-SwitchBuck-BoostControllerTheLTC®3789isahighperformancebuck-boostswitch-ingregulatorcontrollerthatoperatesfrominputvolt-agesabove,beloworequaltotheoutputvoltage.Theconstant-frequency,currentmodearchitectureallowsaphase-lockablefrequencyofupto600kHz,whileanoutputcurrentfeedbackloopprovidessupportforbatterycharg-ing.Withawide4Vto38V(40Vmaximum)inputandoutputrangeandseamless,lownoisetransitionsbetweenoperatingregions,theLTC3789isidealforautomotive,telecomandbattery-poweredsystems.TheoperatingmodeofthecontrollerisdeterminedthroughtheMODE/PLLINpin.TheMODE/PLLINpincanselectbetweenpulse-skippingmodeandforcedcontinuousmodeoperationandallowstheICtobesynchronizedtoanexternalclock.Pulse-skippingmodeoffersthelowestrippleatlightloads,whileforcedcontinuousmodeoperatesataconstantfrequencyfornoise-sensitiveapplications.Apowergoodoutputpinindicateswhentheoutputiswithin10%ofitsdesignedsetpoint.TheLTC3789isavail-ableinlowprofile28-pin4mm×5mmQFNandnarrowSSOPpackages.EfficiencyandPowerLossnSingleInductorArchitectureAllowsVINAbove,BeloworEqualtoRegulatedVOUTnProgrammableInputorOutputCurrentFeedbackLoopnWideVINRange:4Vto38Vn1%OutputVoltageAccuracy:0.8VVOUT38VnSynchronousRectification:Upto98%EfficiencynCurrentModeControlnPhase-LockableFixedFrequency:200kHzto600kHznNoReverseCurrentDuringStart-UpnPowerGoodOutputVoltageMonitornInternal5.5VLDOnQuadN-ChannelMOSFETSynchronousDrivenVOUTDisconnectedfromVINDuringShutdownnAdjustableSoft-StartOutputRampingnAvailablein28-LeadQFN(4mm×5mm)and28-LeadSSOPPackagesnAutomotiveSystemsnDistributedDCPowerSystemsnHighPowerBattery-OperatedDevicesnIndustrialControl+VINVINSNSVOUTSNSILIMPGOOD0.1µF0.1µF121kBOOST1TG1SW1BG1TG2BOOST2SW2BG2MODE/PLLINRUNVFBITHSS0.010Ω4.7µFABDC2200pF1000pF1µFCER10µF16VCER330µF16VON/OFF0.01µF4.7µH8kLTC3789INTVCCEXTVCCSENSE+IOSENSE–IOSENSE+FREQSGNDSENSE–PGND7.5k1%3789TA01105k1%VIN4VTO38VVOUT12V5A+0.010Ω22µF50VCERL,LT,LTC,LTM,LinearTechnology,theLinearlogo,µModuleandBurstModeareregisteredtrademarksandThinSOTisatrademarkofLinearTechnologyCorporation.Allothertrademarksarethepropertyoftheirrespectiveowners.ProtectedbyU.S.Patents,including5408150,5481178,5929620,6580258,7365525,7394231.VIN(V)0EFFICIENCY(%)POWERLOSS(W)9095858010152552030354075701004281060123789TA01bVOUT=12VILOAD=5ALTC378923789fABSOLUTEMAXIMUMRATINGSInputSupplyVoltage(VIN).........................40Vto–0.3VTopsideDriverVoltages(BOOST1,BOOST2)..................................46Vto–0.3VSwitchVoltage(SW1,SW2).........................40Vto–5VCurrentSenseVoltages(IOSENSE+,IOSENSE–)...40Vto–0.3VBOOST1,BOOST2–SW1,SW2...................6Vto–0.3VTG1,TG2–SW1,SW2.................................6Vto–0.3VEXTVCCVoltage..........................................14Vto–0.3VINTVCCVoltage.............................................6Vto–0.3VSENSE+,SENSE–Voltages....................INTVCCto–0.3VMODE/PLLIN,SSVoltages...................INTVCCto–0.3V(Note1)VINSNS,VOUTSNS.........................................40Vto–0.3VBG1,BG2Voltages...............................INTVCCto–0.3VITH,FREQ,ILIMVoltages........................INTVCCto–0.3VVFBVoltage................................................2.7Vto–0.3VRUN,PGOODVoltage.................................6Vto–0.3VOperatingJunctionTemperatureRange(Notes2,3)............................................–40°Cto125°CStorageTemperatureRange...................–65°Cto125°CINTVCCPeakOutputCurrent................................100mALeadTemperature(Soldering,10sec.)GNPackage......................................................300°CORDERINFORMATIONLEADFREEFINISHTAPEANDREELPARTMARKING*PACKAGEDESCRIPTIONTEMPERATURERANGELTC3789EGN#PBFLTC3789EGN#TRPBFLTC378928-LeadNarrowPlasticSSOP–40°Cto125°CLTC3789IGN#PBFLTC3789IGN#TRPBFLTC378928-LeadNarrowPlasticSSOP–40°Cto125°CLTC3789EUFD#PBFLTC3789EUFD#TRPBF378928-Lead(4mm×5mm)PlasticQFN–40°Cto125°CLTC3789IUFD#PBFLTC3789IUFD#TRPBF378928-Lead(4mm×5mm)PlasticQFN–40°Cto125°CConsultLTCMarketingforpartsspecifiedwithwideroperatingtemperatureranges.*Thetemperaturegradeisidentifiedbyalabelontheshippingcontainer.Formoreinformationonleadfreepartmarking,goto::–ITHSGNDMODE/PLLINFREQRUNVINSNSVOUTSNSILIMIOSENSE+IOSENSE–PGOODSW1TG1BOOST1PGNDBG1VININTVCCEXTVCCBG2BOOST2TG2SW2TRIMTJMAX=125°C,θJA=80°C/W910TOPVIEWUFDPACKAGE28-LEAD(4mm×5mm)PLASTICQFN11121328272625241423654321SENSE–ITHSGNDMODE/PLLINFREQRUNVINSNSVOUTSNSBOOST1PGNDBG1VININTVCCEXTVCCBG2BOOST2SENSE+SSVFBPGOODSW1TG1ILIMIOSENSE+IOSENSE–TRIMSW2TG271718192021221681529SGNDTJMAX=125°C,θJA=34°C/WEXPOSEDPAD(PIN29)ISSGND,MUSTBESOLDEREDTOPCBPINCONFIGURATIONLTC378933789fELECTRICALCHARACTERISTICSSYMBOLPARAMETERCONDITIONSMINTYPMAXUNITSVINInputSupplyVoltage438VVOUTOutputVoltage0.838VVFBRegulatedFeedbackVoltageITHVoltage=1.2V(Note4),TA=–40°Cto8