SY8120 DATASHEET规格书

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1、ApplicationNote:SY8120B1HighEfficiencyFastResponse,2A,18VInputSynchronousStepDownRegulatorGeneralDescriptionFeaturesSY8120B1developshighefficiencysynchronousstep-·LowRDS(ON)forinternalswitchesdownDC-DCconvertercapableofdelivering2Aload(top/bottom):130/120mΩcurrent.SY8120B1operatesoveraw

2、ideinputvoltage·4.5-18Vinputvoltagerangerangefrom4.5Vto18Vandintegratesmainswitchand·2AloadcurrentcapabilitysynchronousswitchwithverylowRDS(ON)tominimize·InstantPWMarchitecturetoachievefasttransienttheconductionloss.responsesInternalsoftstartlimitstheinrushcurrent·2%0.6VreferenceSY8120B

3、1adoptstheinstantPWMarchitectureto·Cycle-by-cyclepeakcurrentlimitationachievefasttransientresponsesforhighstepdown·RoHSCompliantandHalogenFreeapplicationsandhighefficiencyatlightloads.In·Compactpackage:SOT23-6addition,itoperatesatpseudo-constantfrequencyof500kHzunderheavyloadconditionst

4、ominimizethesizeofinductorandcapacitor.ApplicationsOrderingInformationSY8120□□□(□□)□□□·SetTopBoxTemperatureCode·PortableTVPackageCode·AccessPointRouterOptionalSpecCode·DSLModemTemperatureRange:-40°Cto85°C·LCDTV·CCTVOrderingNumberPackagetypeNote·IPCAMSY8120B1ABCSOT23-6--·NetworkingTypica

5、lApplications1SilergyCorp.Confidential-Preparedforpowerstar2Figure1.SchematicDiagramFigure2.EfficiencyFigureAN_SY8120B1Rev.0.9SilergyCorp.Confidential-preparedforInternalUseOnly1AN_SY8120B1Pinout(topview)(SOT23-6)TopMark:WBxyz,(Devicecode:WB,x=yearcode,y=weekcode,z=lotnumbercode)PinName

6、PinNumberPinDescriptionBoot-StrapPin.Supplyhighsidegatedriver.DecouplethispintoLXpinwithBS10.1uFceramiccap.GND2GroundpinOutputFeedbackPin.ConnectthispintothecenterpointoftheoutputresistorFB3divider(asshowninFigure1)toprogramtheoutputvoltage:Vout=0.6*(1+R1/R2)EN4Enablecontrol.Pullhightot

7、urnon.Donotfloat.IN5Inputpin.DecouplethispintoGNDpinwithatleast1uFceramiccapLX6Inductorpin.ConnectthispintotheswitchingnodeofinductorAbsoluteMaximumRatings(Note1)SupplyInputVoltage-----------------------------------------------------------------------------------------19VLX,ENV