VT1115M-PROGRAMMABLE-REGULATOR

PROGRAMMABLEOUTPUT,MULTIPHASESWITCHINGREGULATORWITHSMBusREVISION-December30,2004VOLTERRACONFIDENTIALDOCUMENTDoNotReproduceVolterraSemiconductorCorp.Proprietary.DoNotCopy.DoNotDistribute.1VT1115MCHIPSETPRELIMINARYGENERALDESCRIPTIONVolterra’sfourth-generationchipsetisacomplete,integrated,scalablearchitectureforthehighestdensitymultiphasesynchronousbuckregulators.Thisultrahighdensitysolu-tionminimizesexternalcomponentsandoffersenhancedregulatorperformance,comprehensivecontrolandreportingfeatures,easeofdesignandthesmallestfootprintavailablefordemandingmultiphasesynchronousbuckconverters.Thechipsetistargetedforapplicationssuchasserversandnet-workingsystems.TheVT1115MmasterispartoftheVolterraGeneration4architectureasshowninFigure1.EachVT1115MdrivesandcontrolsmultipleGeneration4SmartSlave™integratedoutputdevices,suchastheVT1105SandVT1125S.ThenumberofGeneration4SmartSlaves™canbesetbydesign,accordingtotheapplicationrequirements.ThedesiredslaveandloadoperatingconditionsarecontrolledbyadesiredcurrentcommandissuedfromtheVT1115Mtotheslavedevices.ConfigurationandmonitoringoftheVRconditionsarecontrolledviaaninterconnectingbusbetweenthemasterandtheslavesasshowninFigure1.TheVT1115Msupportsthefollowingvoltageregulatorspeci-fications:Intel®VR10andextendedVR10,AMDOpteron™andIntel®VR11.ThearchitectureincorporatesaSMBusinterfaceformonitor-ingandcontrolofthevoltageregulator.Regulatorparameterscanbesetandmonitoredviathetwo-waySMBusforcontrol,protectionandshutdownoftheregulator.TheSMBuscanprovideareadingoffaultssuchasVXshort-circuitorslaveover-temperature,sothattheregulatorcanbecontrolledandprotectedduringalloperatingconditions.TheSMBuscanalsoprovidetemperaturereadingsofindividualslaves.Akeybenefitofthearchitectureisthatitprovidesexcellentscalabilitybyincreasingthenumberofslavespersystem.Thisflexibilityallowsthedesignertotrade-offcostandperfor-manceforagivenapplicationusingoneVT1115Mcontrolleranddifferentslaveconfigurationswithnoredesignorre-layout.Thenumberofphasesandoutputcurrentrequirementcanbedeterminedbythedesignerandeasilypopulatedorde-populatedtomeetdifferentloadandperformancetargets.Outputvoltage,switchingfrequency,currentperslave,setpoint,droop,over-andundervoltageprotectionlevelsandmanyothervoltageregulatorparametersareallprogrammedeasilyontheVT1115Mcontrollerandcommunicatedtotheslavesviaabusbetweenmasterandslaves.Figure1.VT1115MSystemArchitectureTYPICALAPPLICATIONCIRCUITKEYFEATURES•SmallestFootprint:TypicalSolutionOccupiesLessthan1600mm2ina150AVRMApplication•LowestProfile:5mmMaximumHeight•HighestAccuracyCurrentSharing•Upto25A/PhaseOutput–Programmable•DifferentialVoltageSenseatPointofLoad•ScalableOutputCurrent:Upto8Slaves•SMBusInterface•OutputStatusReportingandShutdown•SlaveTemperatureReporting•FactorySetPresetsforHighPerformanceDesign•SwitchingFrequency:500kHz-1.5MHz•8-BitVIDInput,with6.25mVStepsandSetpointTrimforProgrammableVOUT–Intel®VR10.X:0.83125V-1.60V–Intel®Extended(7-Bit)VR10.X–Intel®VR11:0.6V-1.60V–AMDOpteron™:0.80V-1.55V•DynamicVID•ProgrammableSetpointandDroop•ProgrammableVR_HOTandVR_FANFunctions•ProgrammableOVP,OVLOandUVLO•Cycle-by-CycleCurrentLimiting•PowerGood,OVP,FaultFlagsandOutputEnable•RedundantInputsforPowerGoodandOVPSYSTEMS•ServersandWorkstations•EnterpriseStorage•BroadbandCommunication•Networking•SmallFormFactorDesktopsAPPLICATIONSVoltageRegulatorModules(VRMs)andOn-BoardRegulators(VRDown)•Microprocessors(µP):32and64BitI/AandRISCArchitectures•Memory•GraphicsProcessors•Network,ChipsetICsSmartSlave™InputVoltageOutputVoltageCurrentRatingVIDVT1105S7Vto13.2V0.600Vto1.600V25AperPhaseVRs10.X,11&Opteron™VT1125SVT1115MMasterDigitalControlBusVT11x5SSlave2VT11x5SSlave1VT11x5SSlaveNSMBusVX1VXNVX2SENSE-SENSE+3.3V12VCOUTLOUT1LOUT2LOUTN3.3V12V3.3V12VVOUT3.3VIdesbus&ClockVOLTERRACONFIDENTIALDOCUMENTDoNotReproduce2VolterraSemiconductorCorp.Proprietary.DoNotCopy.DoNotDistribute.REVISED-12/30/04PROGRAMMABLEOUTPUT,MULTIPHASESWITCHINGREGULATORWITHSMBusVT1115MCHIPSETPRELIMINARYPROPRIETARYANDCONFIDENTIALORDERINGINFORMATIONABSOLUTEMAXIMUMRATINGS(SEENOTE1)SupplyVoltage(12V)........................................-0.3Vto16VSupply&InputPinVoltages(3.3V)...................-0.3Vto4VJunctionTemperature(TJ).........................................150°CStorageTemperatureRange.........................-65°to150°CPeakReflowTemperature(30-90sec)...................240°COPERATINGRATINGSInput3.3VVoltages(Master&Slave)...........2.97Vto3.63VSlave12VSupply...........................................7.0Vto13.2VJunctionTemperature(TJ)Master&Slave.......0°to125°CFrequency(Fsw)....................................500kHzto1.5MHzSlaveDCOutputCurrent(VT1105S)............................25ASlaveDCOutputCurrent(VT1125S)............................25APeakInstantaneousSlaveCurrent(VT1105S)..............48APeakInstantaneousSlaveCurrent(VT1125S)..............48ATHERMALRATINGSΘJCMax(TSSOP-48)..............................................30°C/WΘJCMax(CSP-52).................................................0.5°C/WΘJATyp(CSP-52)..................................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