AN-SY7215大电流同步升压芯片-内置15A功率MOS

ApplicationNote:SY7215HighEfficiency,15ASynchronousStepUpRegulatorwithAccurateOutputCurrentLimitAN_SY7215Rev.0.1SilergyCorp.Confidential-PreparedforCustomerUseOnly1GeneralDescriptionSY7215developsahighefficiencysynchronousBoostregulatorwithprogrammableoutputcurrentlimit.Thedeviceadoptsadaptiveconstantofftimeandcurrentmodecontrol.TheintegratedlowRDS(ON)switchesminimizetheconductionloss.SY7215featurescyclebycyclepeakcurrentlimit,outputshortcircuitprotectionandtrueshutdown.Thedevicealsoprovidesenablecontrolandpowergoodindicatorforsystemsequencecontrol.Lowoutputvoltagerippleandsmallexternalinductorandcapacitorsizeareachievedwithprogrammablepseudo-constantfrequency.OrderingInformationPackageCodeTemperatureCodeOptionalSpecCode□□□□(□□□□□□□□)□□□□SY7215OrderingNumberPackagetypeNoteSY7215RDCQFN4x4-18----Features•Inputrange:3-16V•Programmablepseudo-constantfrequency•LowRDS(ON)internalswitchMainFET:16mΩRectifiedFET:18mΩDisconnectionFET:18mΩ•Trueshutdownfunction•Programmableoutputcurrentlimit•Internalsoftstartlimitstheinrushcurrent•InputvoltageUVLO•Overtemperatureprotection•Overvoltageprotection•Outputshortcircuitprotection•Minimumontime:100nstypical•Minimumofftime:120nstypical•RoHSCompliantandHalogenFree•Compactpackage:QFN4x4-18Applications•PowerBank•HighPowerAPTypicalApplicationsFigure1.SchematicDiagramSY7215AN_SY7215Rev.0.1SilergyCorp.Confidential-PreparedforCustomerUseOnly2Pinout(topview)(QFN4x4-18)Topmark:BDUxyz(Devicecode:BDU,x=yearcode,y=weekcode,z=lotnumbercode)PinNameQFN4x4-18PinDescriptionSVIN13ICpowersupplyinputpin.DecouplethispintoSGNDpinwith1µFceramiccap.SGND14SignalgroundpinPGND3,4,5PowergroundpinLX6,7Inductornode.ConnectaninductorfrompowerinputtoLXpin.FB18Feedbackpin.Connecttothecenterofresistorvoltagedividertoprogramtheoutputvoltage:VOUT=1V×(R1/R2+1)EN11Enablecontrol.PullhightoturnontheIC.Donotfloat.ILIM15Outputcurrentlimitprogrampin.ConnectaresistorRLIMfromthispintoSGNDtoprogramoutputcurrentlimitationthreshold.ILIM(A)=30(V)/RLIM(kΩ)OUT1,9Theboostconverteroutputpin.BD2,8ConnecttotheDrainofinternalDisconnectFET.Bypassatleast4.7uFceramiccaptoPGND.BS10Boot-Strappin.SupplyRectifiedFET’sgatedriver.DecouplethispintoLXwith0.1uFceramiccap.FS16Switchingfrequencysettingpin.Connectaresistorfromthispintogroundtoprogramtheswitchingfrequency.FSW(kHz)=1.4×106/RFS(Ω)0.645.PG12Powergoodindicator.Opendrainoutput,pulllowwhentheoutput90%ofregulationvoltage,highimpendenceotherwise.COMP17Loopcompensationpin.ConnectaRCnetworkacrossthispinandgroundtostabilizethecontrolloop.SY7215AN_SY7215Rev.0.1SilergyCorp.Confidential-PreparedforCustomerUseOnly3AbsoluteMaximumRatings(Note1)SVIN,LX,EN,ILIM,OUT,BD,BS,FS,PG,COMP--------------------------------------------------------0.3Vto18VFB---------------------------------------------------------------------------------------------------------------------------------4VBS-LX---------------------------------------------------------------------------------------------------------------------------4VPowerDissipation,PD@TA=25°CQFN4x4-18------------------------------------------------------------------------TBDPackageThermalResistance(Note2)θJA------------------------------------------------------------------------------------------------------------------TBDθJC------------------------------------------------------------------------------------------------------------------TBDJunctionTemperatureRange----------------------------------------------------------------------------------40°Cto125°CLeadTemperature(Soldering,10sec.)--------------------------------------------------------------------------------260°CStorageTemperatureRange-----------------------------------------------------------------------------------65°Cto150°CRecommendedOperatingConditions(Note3)SVIN-------------------------------------------------------------------------------------------------------------------3Vto16VJunctionTemperatureRange---------------------------------------------------------------------------------40°Cto125°CAmbientTemperatureRange-----------------------------------------------------------------------------------40°Cto85°CSY7215AN_SY7215Rev.0.1SilergyCorp.Confidential-PreparedforCustomerUseOnly4BlockDiagramSY7215AN_SY7215Rev.0.1SilergyCorp.Confidential-PreparedforCustomerUseOnly5ElectricalCharacteristics(VIN=5V,VOUT=12V,IOUT=100mA,TA=25°Cunlessotherwisespecified)ParameterSymbolTestConditionsMinTypMaxUnitInputVoltageRangeVIN316VQuiescentCurrentIQVOUT=13V200µAShutdownCurrentISHDNEN=05µAFBLeakageCurrentIFB-5050nAMainN-FETRONRDS(ON)_M16mΩRectifiedN-FETRONRDS(ON)_R18mΩDisconnectN-FETRONRDS(ON)_D18mΩMainN-FETCurrentLimitILIM15ASwitchingFrequencyFSWRFS=390kΩ300kHzFeedbackReferenceVoltageVREF0.98511.015VINUVLORisingThresholdVIN,UVLO2.8VUVLOHysteresisVHYS,UVLO0.2VENRisingThresholdVENH1.5VENFallingThresholdVENL0.4VOutputVoltageOVPVOUT,OVP41VVFB,OVP1.15VOutputCurrentLimitReferenceVoltageVLIM1VMinimumOnTimeTON,MIN100nsMinimumOffTimeTOFF,MIN120nsThermalShutdownTemperatureTSD150°CThermalShutdownHysteresisTHYS15°CNote1:Stress