AN-SY98081-SMI-Dennis

ApplicationNote:SY98081/A/B/C/D/E/FHighEfficiency3MHz,0.6AInductorBuilt-inSynchronousStepDownRegulatorPreliminarySpecificationAN_SY98081/A/B/C/D/E/FRev.0.4SilergyCorp.Confidential-PreparedforCustomerUseOnly1GeneralDescriptionSY98081/A/B/C/D/E/Fare3MHz,0.6Asynchronousstep-downconverterswhichintegratesaninductorandacontrolICinonetinypackage(2.0mm×1.5mm,H=1.26mm).Itcanoperateoverawideinputvoltagerangefrom2.5Vto5.5VandintegratemainswitchandsynchronousswitchwithverylowRDS(ON)tominimizetheconductionloss.OrderingInformationPackageCodeTemperatureCodeOptionalSpecCode□□□□(□□□□□□□□)□□□□SY98081PackageCodeTemperatureCodeOptionalSpecCode□□□□(□□□□□□□□)□□□□SY98081TemperatureRange:-40°Cto85°CFeatures•LowRDS(ON)forinternalswitches(top/bottom)230mΩ/150mΩ•IntegrateaninductortominimizestheexternalcomponentsandPCBlayoutdesign•2.5~5.5Vinputvoltagerange•Outputvoltage:﹣SY98081:Outputvoltageadjustable﹣SY98081A:Fixed1.2VOUT﹣SY98081B:Fixed1.5VOUT﹣SY98081C:Fixed1.8VOUT﹣SY98081D:Fixed2.5VOUT﹣SY98081E:Fixed3.3VOUT﹣SY98081F:Fixed1.0VOUT•Highswitchingfrequency3MHzminimizestheexternalcomponents•Internalsoft-startlimitstheinrushcurrent•100%dropoutoperation•RoHSCompliantandHalogenFree•Outputautodischargefunction•Compactpackage:QFN2x1.5-8Applications•Mobilephone,Smartphone•BluetoothHeadsets•WiMAXPDA,MID,UMPC•Portablegameconsole•Digitalcamera,CamcordeTypicalApplicationsFigure1.SchematicDiagram(ForSY98081A/B/C/D/E/F)OrderingNumberPackageNoteSY98081QUCQFN2×1.5-8VOUTAdjustableSY98081AQUCQFN2×1.5-8Fixed1.2VOUTSY98081BQUCQFN2×1.5-8Fixed1.5VOUTSY98081CQUCQFN2×1.5-8Fixed1.8VOUTSY98081DQUCQFN2×1.5-8Fixed2.5VOUTSY98081EQUCQFN2×1.5-8Fixed3.3VOUTSY98081FQUCQFN2×1.5-8Fixed1.0VOUTSY98081/A/B/C/D/E/FAN_SY98081/A/B/C/D/E/FRev.0.4SilergyCorp.Confidential-PreparedforCustomerUseOnly2Figure2.SchematicDiagram(ForSY98081)SY98081/A/B/C/D/E/FAN_SY98081/A/B/C/D/E/FRev.0.4SilergyCorp.Confidential-PreparedforCustomerUseOnly3Pinout(TopView)TopMark:YGxyzforSY98081(devicecode:YG,x=yearcode,y=weekcode,z=lotnumbercode)UMxyzforSY98081A(devicecode:UM,x=yearcode,y=weekcode,z=lotnumbercode)UNxyzforSY98081B(devicecode:UN,x=yearcode,y=weekcode,z=lotnumbercode)TPxyzforSY98081C(devicecode:TP,x=yearcode,y=weekcode,z=lotnumbercode)UOxyzforSY98081D(devicecode:UO,x=yearcode,y=weekcode,z=lotnumbercode)UPxyzforSY98081E(devicecode:UP,x=yearcode,y=weekcode,z=lotnumbercode)UQxyzforSY98081F(devicecode:UQ,x=yearcode,y=weekcode,z=lotnumbercode)PinNamePinNumberPinDescriptionOUT1OutputPin.Decouplethispintogroundwithatleast4.7uFceramiccap.EN2Enablecontrol.Pullhightoturnon.Donotfloat.GND3,7Groundpin.FB4SY98081Outputadjustableversion.Connectthispintothecenterpointoftheoutputresistordividertoprogramtheoutputvoltage:VOUT=0.6×(1+R1/R2).SY98081A/B/C/D/E/FFixedoutputversion.Connectthispintotheoutputfortheoutputvoltageregulation.LX5,6Built-ininductornode.Leaveitfloating.IN8Inputpin.DecouplethispintoGNDpinwithatleast4.7uFceramiccap.AbsoluteMaximumRatings(Note1)SupplyInputVoltage,LX,OUTpins--------------------------------------------------------------------------------------6.0VEnable,FBVoltage----------------------------------------------------------------------------------------------------VIN+0.6VPowerDissipation,PD@TA=25°C,QFN2×1.5-8---------------------------------------------------------------------------------------------------------TBDPackageThermalResistance(Note2)θJA-------------------------------------------------------------------------------------------------------------------TBDθJC--------------------------------------------------------------------------------------------------------------------TBDJunctionTemperatureRange----------------------------------------------------------------------------------------------150°CLeadTemperature(Soldering,10sec.)----------------------------------------------------------------------------------260°CStorageTemperatureRange------------------------------------------------------------------------------------65°Cto150°CSY98081/A/B/C/D/E/FAN_SY98081/A/B/C/D/E/FRev.0.4SilergyCorp.Confidential-PreparedforCustomerUseOnly4RecommendedOperatingConditions(Note3)SupplyInputVoltage-----------------------------------------------------------------------------------------------2.5Vto5.5VJunctionTemperatureRange------------------------------------------------------------------------------------40°Cto125°CAmbientTemperatureRange-------------------------------------------------------------------------------------40°Cto85°CElectricalCharacteristics(VIN=5V,VOUT=1.8V,COUT=4.7uF,TA=25°C,unlessotherwisespecified)ParameterSymbolTestConditionsMinTypMaxUnitInputVoltageRangeVIN2.55.5VQuiescentCurrentIQIOUT=0,VFB=VREF⋅105%40μAShutdownCurrentISHDNEN=00.11μAFeedbackReferenceVoltageVREFSY980810.5880.60.612VOutputVoltageVOUTSY98081A1.1761.21.224VSY98081B1.471.51.53VSY98081C1.7641.81.836VSY98081D2.452.52.55VSY98081E3.2343.33.366VSY98081F0.981.01.02VPFETRONRDS(ON),P230mΩNFETRONRDS(ON),N150mΩInductanceL1.0uHPFETCurrentLimitILIM1.3AENrisingthresholdVENH1.5VENfallingthresholdVENL0.4VInputUVLOthr