LTC3826-1中文资料

LTC3826-1138261fbTYPICALAPPLICATIONFEATURESAPPLICATIONSDESCRIPTION30µAIQ,Dual,2-PhaseSynchronousStep-DownControllernAutomotiveSystemsnBattery-OperatedDigitalDevicesnDistributedDCPowerSystemsL,LT,LTCandLTMareregisteredtrademarksofLinearTechnologyCorporation.BurstModeandOPTI-LOOPareregisteredtrademarksofLinearTechnologyCorporation.Allothertrademarksarethepropertyoftheirrespectiveowners.ProtectedbyU.S.Patentsincluding5481178,5929620,6177787,6144194,5408150,6580258,6304066,5705919.nWideOutputVoltageRange:0.8V≤VOUT≤10VnLowOperatingIQ:30μA(OneChannelOn)nOut-of-PhaseControllersReduceRequiredInputCapacitanceandPowerSupplyInducedNoisenOPTI-LOOP®CompensationMinimizesCOUTn±1%OutputVoltageAccuracynWideVINRange:4Vto36VOperationnPhase-LockableFixedFrequency140kHzto650kHznSelectableContinuous,PulseSkippingorLowRippleBurstMode®OperationatLightLoadsnDualN-ChannelMOSFETSynchronousDrivenVeryLowDropoutOperation:99%DutyCyclenAdjustableOutputVoltageSoft-StartorTrackingnOutputCurrentFoldbackLimitingnPowerGoodOutputVoltageMonitornOutputOvervoltageProtectionnLowShutdownIQ:4μAnInternalLDOPowersGateDrivefromVINorVOUTnSmall28-LeadSSOPPackageTheLTC®3826-1isahighperformancedualstep-downswitchingregulatorcontrollerthatdrivesallN-channelsynchronouspowerMOSFETstages.Aconstantfrequencycurrentmodearchitectureallowsaphase-lockablefre-quencyofupto650kHz.PowerlossandnoiseduetotheESRoftheinputcapacitorESRareminimizedbyoperatingthetwocontrolleroutputstagesoutofphase.The30μAno-loadquiescentcurrentextendsoperatinglifeinbatterypoweredsystems.OPTI-LOOPcompensa-tionallowsthetransientresponsetobeoptimizedoverawiderangeofoutputcapacitanceandESRvalues.TheLTC3826-1featuresaprecision0.8Vreferenceandapowergoodoutputindicator.Awide4Vto36Vinputsupplyrangeencompassesallbatterychemistries.IndependentTRACK/SSpinsforeachcontrollerramptheoutputvoltageduringstart-up.CurrentfoldbacklimitsMOSFETheatdissipationduringshort-circuitconditions.ThePLLIN/MODEpinselectsamongBurstModeopera-tion,pulseskippingmode,orcontinuousinductorcur-rentmodeatlightloads.Foraleadlesspackageversion(5mm×5mmQFN)withadditionalfeatures,seetheLTC3826datasheet.HighEfficiencyDual8.5V/3.3VStep-DownConverterEfficiencyandPowerLossvsLoadCurrent0.1μF62.5k3.3μH220pF150μF4.7μF22μF50V0.015Ω20k15kVOUT13.3V5A150μF0.1μF192.5k7.2μH220pF0.015Ω20k15kVOUT28.5V3.5ATG1TG2BOOST1BOOST2SW1SW2BG1BG2SGNDPGNDSENSE1+SENSE2+SENSE1–SENSE2–VFB1VFB2ITH1ITH2VININTVCCTRACK/SS1TRACK/SS2VIN4VTO36V38261TA010.1μF0.1μFLTC3826-1OUTPUTCURRENT(A)0.000010.000140EFFICIENCY(%)POWERLOSS(mW)506070800.0010.010.111038261TA01b30201009010011010001000.110000FIGURE13CIRCUITLTC3826-1238261fbABSOLUTEMAXIMUMRATINGS1234567891011121314TOPVIEWGPACKAGE28-LEADPLASTICSSOPTJMAX=125°C,QJA=95°C/W2827262524232221201918171615ITH1VFB1SENSE1+SENSE1–PLLLPFPLLIN/MODESGNDRUN1RUN2SENSE2–SENSE2+VFB2ITH2TRACK/SS2TRACK/SS1PGOOD1TG1SW1BOOST1BG1VINPGNDEXTVCCINTVCCBG2BOOST2SW2TG2ELECTRICALCHARACTERISTICSTheldenotesthespecificationswhichapplyoverthefulloperatingtemperaturerange,otherwisespecificationsareatTA=25°C.VIN=12V,VRUN/SS1,2=5Vunlessotherwisenoted.SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITSMainControlLoopsVFB1,2RegulatedFeedbackVoltage(Note4)ITH1,2Voltage=1.2Vl0.7920.8000.808VIVFB1,2FeedbackCurrent(Note4)–5–50nAVREFLNREGReferenceVoltageLineRegulationVIN=4Vto30V(Note4)0.0020.02%/VORDERINFORMATIONLEADFREEFINISHTAPEANDREELPARTMARKINGPACKAGEDESCRIPTIONTEMPERATURERANGELTC3826EG-1#PBFLTC3826EG-1#TRPBFLTC3826EG-128-LeadPlasticSSOP–40°Cto85°CLTC3826IG-1#PBFLTC3826IG-1#TRPBFLTC3826IG-128-LeadPlasticSSOP–40°Cto85°CLEADBASEDFINISHTAPEANDREELPARTMARKINGPACKAGEDESCRIPTIONTEMPERATURERANGELTC3826EG-1LTC3826EG-1#TRLTC3826EG-128-LeadPlasticSSOP–40°Cto85°CLTC3826IG-1LTC3826IG-1#TRLTC3826IG-128-LeadPlasticSSOP–40°Cto85°CConsultLTCMarketingforpartsspecifiedwithwideroperatingtemperatureranges.Formoreinformationonleadfreepartmarking,goto:fications,goto:(VIN).........................36Vto–0.3VTopsideDriverVoltagesBOOST1,BOOST2..................................42Vto–0.3VSwitchVoltage(SW1,SW2).........................36Vto–5V(BOOST1-SW1),(BOOST2-SW2).............8.5Vto–0.3VRUN1,RUN2...............................................7Vto–0.3VSENSE1+,SENSE2+,SENSE1–,SENSE2–Voltages.....................................11Vto–0.3VPLLIN/MODE,PLLLPF,TRACK/SS1,TRACK/SS2Voltages...........................................INTVCCto–0.3VEXTVCC......................................................10Vto–0.3VITH1,ITH2,VFB1,VFB2Voltages.................2.7Vto–0.3VPGOOD1Voltage.......................................8.5Vto–0.3VPeakOutputCurrent10μs(TG1,TG2,BG1,BG2).....3AOperatingTemperatureRange(Note2)....–40°Cto85°CJunctionTemperature(Note3).............................125°CStorageTemperatureRange...................–65°Cto150°CLeadTemperature(Soldering,10sec)..................300°C(Note1)PINCONFIGURATIONLTC3826-1338261fbELECTRICALCHARACTERISTICSTheldenotesthespecificationswhichapplyoverthefulloperatingte