VRM 10.2

VoltageRegulatorModule(VRM)10.2LDesignGuidelinesMarch2005DocumentNumber:306761-0012VoltageRegulatorModule(VRM)10.2LDesignGuidelinesINFORMATIONINTHISDOCUMENTISPROVIDEDINCONNECTIONWITHINTEL®PRODUCTS.NOLICENSE,EXPRESSORIMPLIED,BYESTOPPELOROTHERWISE,TOANYINTELLECTUALPROPERTYRIGHTSISGRANTEDBYTHISDOCUMENT.EXCEPTASPROVIDEDININTEL'STERMSANDCONDITIONSOFSALEFORSUCHPRODUCTS,INTELASSUMESNOLIABILITYWHATSOEVER,ANDINTELDISCLAIMSANYEXPRESSORIMPLIEDWARRANTY,RELATINGTOSALEAND/ORUSEOFINTELPRODUCTSINCLUDINGLIABILITYORWARRANTIESRELATINGTOFITNESSFORAPARTICULARPURPOSE,MERCHANTABILITY,ORINFRINGEMENTOFANYPATENT,COPYRIGHTOROTHERINTELLECTUALPROPERTYRIGHT.Intelproductsarenotintendedforuseinmedical,lifesaving,lifesustaining,criticalcontrolorsafetysystems,orinnuclearfacilityapplications.Intelmaymakechangestospecificationsandproductdescriptionsatanytime,withoutnotice.Designersmustnotrelyontheabsenceorcharacteristicsofanyfeaturesorinstructionsmarked“reserved”or“undefined.”Intelreservestheseforfuturedefinitionandshallhavenoresponsibilitywhatsoeverforconflictsorincompatibilitiesarisingfromfuturechangestothem.ContactyourlocalIntelsalesofficeoryourdistributortoobtainthelatestspecificationsandbeforeplacingyourproductorder.Intel®Xeon™processorand64-bitIntel®Xeon™processorMPmaycontaindesigndefectsorerrorsknownaserratathatmaycausetheproducttodeviatefrompublishedspecifications.Currentcharacterizederrataareavailableonrequest.Intel,IntelXeon,PentiumandtheIntellogoaretrademarksorregisteredtrademarksofIntelCorporationoritssubsidiariesintheUnitedStatesandothercountries.∆Intelprocessornumbersarenotameasureofperformance.Processornumbersdifferentiatefeatureswithineachprocessorfamily,notacrossdifferentprocessorfamilies.See*Othernamesandbrandsmaybeclaimedasthepropertyofothers.Copyright©2005,IntelCorporation.VoltageRegulatorModule(VRM)10.2LDesignGuidelines3Contents1Applications........................................................................................................................71.1IntroductionandTerminology..............................................................................................72OutputVoltageRequirements............................................................................................92.1VoltageandCurrent-REQUIRED.......................................................................................92.2LoadLineDefinitions-REQUIRED...................................................................................102.3VoltageTolerance-REQUIRED........................................................................................112.4Stability-REQUIRED........................................................................................................122.5ProcessorPowerSequencing-REQUIRED.....................................................................122.6DynamicVoltageIdentification(VID)-REQUIRED...........................................................132.7OvershootatTurn-OnorTurn-Off-REQUIRED...............................................................152.8OutputFilterCapacitance-REQUIRED............................................................................152.9Shut-DownResponse-REQUIRED..................................................................................163ControlSignals.................................................................................................................173.1OutputEnable(OUTEN)-REQUIRED..............................................................................173.2VoltageIdentification(VID[5:0])-REQUIRED..................................................................173.3DifferentialRemoteSense(VO_SEN±)-REQUIRED.......................................................193.4LoadLineSelect(LL0,LL1)-REQUIRED.........................................................................194InputVoltageandCurrent................................................................................................214.1InputVoltages-EXPECTED.............................................................................................214.2LoadTransientEffectsonInputCurrent-EXPECTED.....................................................215ProcessorVoltageOutputProtection...............................................................................235.1Over-VoltageProtection(OVP)-PROPOSED..................................................................235.2Over-CurrentProtection(OCP)-PROPOSED..................................................................236OutputIndicators..............................................................................................................256.1PowerGood(Vcc_PWRGD)-PROPOSED......................................................................256.2VoltageRegulatorHot(VR_hot#)-PROPOSED...............................................................256.3LoadIndicatorOutput(LoadCurrent)-PROPOSED........................................................266.4VRMPresent(VRM_pres#)-EXPECTED