AN_SY8368A---8A,16A大电流同步降压芯片

ApplicationNotes:AN_SY8368AHighEfficiencyFastResponse8AContinuous,16APeak,28VInputSynchronousStepDownRegulatorAN_SY8368ARev.0.9BSilergyCorp.Confidential-PreparedforCustomerUseOnly1GeneralDescriptionTheSY8368Adevelopsahighefficiencysynchronousstep-downDC-DCregulatorcapableofdelivering8Acontinuous,16Apeakcurrent.TheSY8368Aoperatesoverawideinputvoltagerangefrom4.0Vto28VandintegratesmainswitchandsynchronousswitchwithverylowRDS(ON)tominimizetheconductionloss.TheSY8368AadoptstheinstantPWMarchitecturetoachievefasttransientresponsesforhighstepdownapplicationsandhighefficiencyatlightloads.Inaddition,itoperatesatpseudo-constantfrequencyof800kHzundercontinuousconductionmodetominimizethesizeofinductorandcapacitor.OrderingInformationPackageCodeTemperatureCodeOptionalSpecCode□□□□(□□□□□□□□)□□□□SY8368Features•4.0-28Vwideinputvoltagerange•LowRDS(ON)forinternalswitches:20/10mΩ•InstantPWMarchitecturetoachievefasttransientresponse•Internal600ussoft-startlimitstheinrushcurrent•Pseudo-constantfrequency:800kHz•8Acontinuous,16Apeakoutputcurrentcapability•+/-1%0.6Vreferencevoltage•HiccupmodeSCP,OVP•ThermalshutdownwithautorecoveryApplications•LCD-TV/Net-TV/3DTV•SetTopBox•Notebook•HighPowerAPTypicalApplicationsINGNDENBSLXFBVCCCOUTCFFR1R2LCBSVOUTVINON/OFFCINPGCVCCPG(OpenDrainOutput)ILMTHigh/Floating/LowRFFFigure1SchematicFigure2.EfficiencyOrderingNumberPackagetypeNoteSY8368AQQCQFN3x3-12--AN_SY8368AAN_SY8368ARev.0.9BSilergyCorp.Confidential-PreparedforCustomerUseOnly2Pinout(topview)(QFN3x3-12)TopMark:AVIxyz,(Devicecode:AVI,x=yearcode,y=weekcode,z=lotnumbercode)PinNamePinNumberPinDescriptionGND1,3GroundpinLX2Inductorpin.ConnectthispintotheswitchingnodeofinductorIN4,5,6Inputpin.DecouplethispintoGNDpinwithatleast10uFceramiccapBS7Boot-StrapPin.Supplyhighsidegatedriver.DecouplethispintoLXpinwith0.1uFceramiccap.VCC8Internal3.3VLDOoutput.Powersupplyforinternalanalogcircuitsanddrivingcircuit.BypassacapacitortoGND.FB9OutputFeedbackPin.Connectthispintothecenterpointoftheoutputresistordivider(asshowninFigure1)toprogramtheoutputvoltage:Vout=0.6*(1+R1/R2)ILMT10Currentlimitsettingpin.Thecurrentlimitissetto8A,12Aor16Awhenthispinispulllow,floatingorpullhighrespectively.PG11PowergoodIndicator.Opendrainoutputwhentheoutputvoltageiswithin90%to120%ofregulationpoint.EN12Enablecontrol.PullthispinhightoturnontheIC.Donotleavethispinfloating.AN_SY8368AAN_SY8368ARev.0.9BSilergyCorp.Confidential-PreparedforCustomerUseOnly3AbsoluteMaximumRatings(Note1)IN,LX,PG,EN------------------------------------------------------------------------------------------------------------------30VBS-LX,FB,ILMT,VCC--------------------------------------------------------------------------------------------------------4VPowerDissipation,PD@TA=25°CQFN3x3-12-----------------------------------------------------------------------3.3WPackageThermalResistance(Note2)θJA-----------------------------------------------------------------------------------------------------------------30°C/WθJC----------------------------------------------------------------------------------------------------------------4°C/WJunctionTemperatureRange------------------------------------------------------------------------------------------------125°CLeadTemperature(Soldering,10sec.)------------------------------------------------------------------------------------260°CStorageTemperatureRange---------------------------------------------------------------------------------------65°Cto150°CDynamicLXvoltagein50nsduration---------------------------------------------------------------------IN+3VtoGND-4VRecommendedOperatingConditions(Note3)SupplyInputVoltage----------------------------------------------------------------------------------------------------4Vto28VJunctionTemperatureRange--------------------------------------------------------------------------------------40°Cto125°CAmbientTemperatureRange---------------------------------------------------------------------------------------40°Cto85°CBlockDiagramAN_SY8368AAN_SY8368ARev.0.9BSilergyCorp.Confidential-PreparedforCustomerUseOnly4ElectricalCharacteristics(VIN=12V,VOUT=5V,COUT=100uF,TA=25°C,IOUT=2Aunlessotherwisespecified)ParameterSymbolTestConditionsMinTypMaxUnitInputVoltageRangeVIN4.028VQuiescentCurrentIQIOUT=0,VFB=VREF*105%100μAShutdownCurrentISHDNEN=0310μAFeedbackReferenceVoltageVREF0.5940.60.606VFBInputCurrentIFBVFB=4V-5050nATopFETRONRds(on)120mΩBottomFETRONRds(on)210mΩDischargeFETRONRdis50ΩBottomFETCurrentLimitILIMILMT=’0’8AILMT=Floating12ILMT=’1’16ILMTRisingThresholdVILMTHVcc-0.8VCCVILMTFallingThresholdVILMTL0.8VSoftStartTimeTSS600usENRisingThresholdVENH0.8VENFallingThresholdVENL0.4VInputUVLOThresholdVUVLO3.9VUVLOhysteresisVHYS0.3VOscillatorFrequencyFOSCVo=5V0.680.80.92MHzMinONTimeTON,MINVIN=VINMAX50nsMinOFFTimeTOFF,MIN180nsVCCOutputVCCVIN=4.2V3.23.33.4VOutputOverVoltageThresholdVFBRising115120125%VREFOutputOverVoltageHysteresis2%VREFOutputOverVoltageDelayTime20usPowerGoodThresholdVFBRising(Good)889092%VREFPowerGoodHysteresis2%VREFPowerGoodDelayTime10usTherm