分析Vcore的&3.3V5V力量管理者电路(1)

1AnalyzethepowerregulatorcircuitforVcore&3.3V/5VPresentbyLukeXu2003/11/272AnalyzethepowerregulatorcircuitforVcore&3.3V/5VbaseonKT9TheContents1.TypicalNotebookPowerSupplyDiagram2.Analyzethe3.3V&5Vregulatorcircuit3.AnalyzetheCPUVcoreregulatorcircuit4.Conclusions5.Q&A31.TypicalNotebookPowerSupplyDiagram1.1BlockDiagramofNotebookPowerSupply1.2NS87570PowerSequence41.1BlockDiagramofNotebookPowerSupply3V_MODEM5VPCU3VPCU12VOUTon/offon/offon/offon/offon/offon/offon/offMAX163212V12VS5VSUS5V3VSUS3VMAINONSUSONSUSDMAINDSUSDMAINDS5_MODENENSC1470SC1480HIP63012_5VSUSVTT_DDRVHCOREon/offon/offSMARTCHARGERRUN/ON3ADAPTERTIME/ON5SUSONMAINONCORE_ENVHVHPWR_SRCVID(0…4)5NS87570MS1535+DCtoDCBuckConverterLogic&Delaycircuit-DNBSWON-NBSWON-SUSB-SUSCSUSONMAINONVRONHWPG_POWERNPWROKNB_PWROKSB_PWROKCPU_PWRGD(1)RVCC(2)(3)(4)(5)(6)(7)PWRBUTTON1.2NS87570PowerSequence62.Analyzethe3.3V&5Vregulatorcircuit2.1SomeBasicsonSynchronousBuckConverter2.2IntroducetypicalcontrolICspecificationofMAX1632Controller2.3Analyzethe3.3V&5VregulatorSchematics72.1SomeBasicsonSynchronousBuckConverterCoVinL1M1VoM2CinGNDBasicOperation:1)TopswitchM1“on”andbottomswitchM2“off”Vin-VoacrossL1andcurrentflowsinM1,L1,andintotheloadwithpositiveslope.2)TopswitchM1“off”andbottomswitchM2“on”VovoltageacrossL1(reverse)andcurrentflowsinL1andintotheloadwithnegativeslope.Firstorderinput-outputvoltagerelation:inoDVV82.1SomeBasicsonSynchronousBuckConverter(Cont.)t1t4TopGateDriveBottomGateDriveTopSwitchCurrentBottomSwitchCurrentBottomDiodeCurrentBottomChannelCurrentSwitchNodeVoltageInductorCurrentt0t2t3t5t7t6t8t9ttCoVinL1M1VoM2CinGNDSN92.2IntroducetypicalcontrolICspecificationofMAX1632ControllerThefeaturesofcontrollerMax1632:96%Efficiency+4.2Vto+30VInputRangeSelectable3.3V&5VFixedorAdjustableOutputs(DualMode)12VLinearRegulator5V/50mALinearRegulatorOutputPrecision2.5VReferenceOutputProgrammablePower-UpSequencingPower-Good(RESET)OutputOutputOvervoltageProtectionOutputUndervoltageShutdown200kHz/300kHzLow-Noise,Fixed-FrequencyOperationLow-Dropout,99%Duty-FactorOperation2.5mWTypicalQuiescentPower(+12Vinput,bothSMPSson)4µATypicalShutdownCurrent102.2IntroducetypicalcontrolICspecificationofMAX1632Controller(Cont.)MAX1632BlockDiagram112.2IntroducetypicalcontrolICspecificationofMAX1632Controller(Cont.)PinDescriptionPINNAMEFUNCTION1CSH3Current-SenseInputforthe3.3VSMPS.Current-limitlevelis100mVreferredtoCSL3.2CSL3Current-SenseInput.Alsoservesasthefeedbackinputinfixed-outputmode.3FB3FeedbackInputforthe3.3VSMPS;regulatesatFB3=REF(approx.2.5V)inadjustablemode.FB3isaDualModeinputthatalsoselectsthe3.3VfixedoutputvoltagesettingwhentiedtoGND.ConnectFB3toaresistordividerforadjustable-outputmode.412OUT12V/120mALinearRegulatorOutput.InputsupplycomesfromVDD.Bypass12OUTtoGNDwith1µFminimum.5VDDSupplyVoltageInputforthe12OUTLinearRegulator.Alsoconnectstoaninternalresistordividerforsecondarywindingfeedback,andtoan18Vovervoltageshuntregulatorclamp.122.2IntroducetypicalcontrolICspecificationofMAX1632Controller(Cont.)PinDescriptionPINNAMEFUNCTION6SYNCOscillatorSynchronizationandFrequencySelect.TietoVLfor300kHzoperation;tietoGNDfor200kHzoperation.Canbedrivenat240kHzto350kHzforexternalsynchronization.7TIME/ON5Dual-PurposeTimingCapacitorPinandON/OFFControlInput.SeePower-UpSequencingandON/OFFControlssection.8GNDLow-NoiseAnalogGroundandFeedbackReferencePoint9REF2.5VReferenceVoltageOutput.BypasstoGNDwith1µFmin.10SKIPLogic-ControlInputthatdisablesIdleModewhenhigh.ConnecttoGNDfornormaluse.11RESETActive-LowTimedResetOutput.RESETswingsGNDtoVL.Goeshighafterafixed32,000clock-cycledelayfollowingpower-up.12FB5FeedbackInputforthe5VSMPS;regulatesatFB5=REF(approx.2.5V)inadjustablemode.FB5isaDualModeinputthatalsoselectsthe5VfixedoutputvoltagesettingwhentiedtoGND.ConnectFB5toaresistordividerforadjustable-outputmode.132.2IntroducetypicalcontrolICspecificationofMAX1632Controller(Cont.)PinDescriptionPINNAMEFUNCTION13CSL5Current-SenseInputforthe5VSMPS.Alsoservesasthefeedbackinputinfixed-outputmode,andasthebootstrapsupplyinputwhenthevoltageonCSL5/VLis4.5V.14CSH5Current-SenseInputforthe5VSMPS.Current-limitlevelis100mVreferredtoCSL5.15SEQPin-StrapInputthatselectstheSMPSpower-upsequence:SEQ=GND:5Vbefore3.3V,RESEToutputdeterminedbybothoutputs;SEQ=REF:SeparateON3/ON5controls,RESEToutputdeterminedby3.3Voutput;SEQ=VL:3.3Vbefore5V,RESEToutputdeterminedbybothoutputs16DH5Gate-DriveOutputforthe5V,high-sideN-channelswitch.DH5isafloatingdriveroutputthatswingsfromLX5toBST5,ridingontheLX5switchingnodevoltage.17LX5SwitchingNode(inductor)Connection.Canswing2Vbelowgroundwithouthazard.18BST5Boostcapacitorconnectionforhigh-sidegatedrive(0.1µF)142.2IntroducetypicalcontrolICspecificationofMAX1632Controller(Cont.)PinDescriptionPINNAMEFUNCTION19DL5Gate-DriveOutputforthelow-sidesynchronous-rectifierMOSFET.Swings0VtoVL.20PGNDPowerGround21VL5VInternalLinear-RegulatorOutput.VLisalsothesupplyvoltagerailforthechip.Afterthe5VSMPSoutputhasreached+4.5V(typical),VLautomaticallyswitchestotheoutputvoltageviaCSL5forbootstrapping.BypasstoGNDwith4.7µF.VLs