Openwww.18jjj

TPS65287www.
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comSLVSBX2–MAY20134.
5-Vto18-VInput,HighCurrent,SynchronousStepDownThreeDC-DCConverterwithIntegratedFET,USBSwitchandPushButtonControlCheckforSamples:TPS652871FEATURESWideInputSupplyVoltageRange:PulseSkippingModetoAchieveHighLight4.
5V-18VLoadEfficiency,AllowingforanOutputRippleBetterthan2%0.
8-V,1%AccuracyReferenceSupportPre-BiasedOutputsContinuousLoading:3A(Buck1),2A(Buck2and3)PowerGoodSupervisorandResetGeneratorMaximumCurrent:Upto2.
1-AUSBPowerWithOverCurrent3.
5A(Buck1),2.
5A(Buck2and3)SettingbyExternalResistor300-kHz–2.
2-MHzSwitchingFrequencySetIndividualThermalProtectionforUSBSwitchByExternalResistorPushButton(10-kVESDRatedPinforPB_IN)ExternalEnablePinsWithBuilt-InCurrentControlforIntelligentSystemPower-SourceforEasySequencingOn/Power-OffOperationExternalSoftStartPinsSmall,ThermallyEfficient40-Pin6-mmx6-mmRHA(QFN)packageAdjustableCycle-by-CycleCurrentLimitSetbyExternalResistor-40°Cto125°CJunctionTemperatureRangeCurrent-ModeControlWithSimpleCompensationCircuitDESCRIPTION/ORDERINGINFORMATIONTPS65287isapowermanagementICwiththreestep-downbuckconverters.
Bothhigh-sideandlow-sideMOSFETsareintegratedtoprovidefullysynchronousconversionwithhigherefficiency.
Theconvertersaredesignedtosimplifyitsapplicationwhilegivingthedesignertheoptiontooptimizetheirusageaccordingtothetargetapplication.
Theconverterscanoperatein5-,9-,12-or15-Vsystems.
Theoutputvoltagecanbesetexternallyusingaresistordividertoanyvaluebetween0.
8Vandtheinputsupplyminustheresistivedropsontheconverterpath.
Eachconverterfeaturesenablepinthatallowsadelayedstart-upforsequencingpurposes,softstartpinthatallowsadjustablesoft-starttimebychoosingthesoft-startcapacitor,andacurrentlimit(RLIM)pinthatenablesdesignertoadjustcurrentlimitbyselectinganexternalresistorandoptimizethechoiceofinductor.
Allconvertersoperatein'hiccupmode':Onceanover-currentlastingmorethan10msissensedinanyoftheconverters,theywillshutdownfor10msandthenthestart-upsequencingwillbetriedagain.
Iftheoverloadhasbeenremoved,theconverterwillrampupandoperatenormally.
Ifthisisnotthecasetheconverterwillseeanotherover-currenteventandshutsdownagainrepeatingthecycle(hiccup)untilthefailureiscleared.
Ifanoverloadconditionlastsforlessthan10ms,onlytherelevantconverteraffectedwillshut-downandre-startandnoglobalhiccupmodewilloccur.
TheswitchingfrequencyoftheconvertersissetbyanexternalresistorconnectedtoROSCpin.
Theswitchingregulatorsaredesignedtooperatefrom300kHzto2.
2MHz.
Theconvertersoperatewith180°phasebetweenthentominimizetheinputfilterrequirements.
Allconvertershavepeakcurrentmodecontrolwhichsimplifiesexternalfrequencycompensation.
Thedevicehasabuilt-inslopecompensationramp.
Theslopecompensationcanpreventsubharmonicoscillationsinpeakcurrentmodecontrol.
AtraditionaltypeIIcompensationnetworkcanstabilizethesystemandachievefasttransientresponse.
Moreover,anoptionalcapacitorinparallelwiththeupperresistorofthefeedbackdividerprovidesonemorezeroandmakesthecrossoverfrequencyover100kHz.
AllconvertersfeatureanautomaticlowpowerpulsePFMskippingmodewhichimprovesefficiencyduringlightloadsandstandbyoperation,whileguaranteeingaverylowoutputripple,allowingforavalueoflessthan2%atlowoutputvoltages.
1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2013,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
TPS65287SLVSBX2–MAY2013www.
ti.
comThedeviceincorporatesanovervoltagetransientprotectioncircuittominimizevoltageovershoot.
TheOVPfeatureminimizestheoutputovershootbyimplementingacircuittocomparetheFBpinvoltagetoOVPthresholdwhichis106%oftheinternalvoltagereference.
IftheFBpinvoltageisgreaterthantheOVTPthreshold,thehighsideMOSFETisdisabledpreventingcurrentfromflowingtotheoutputandminimizingoutputovershoot.
WhentheFBvoltagedropslowerthantheOVPlowerthresholdwhichis104%,thehighsideMOSFETisallowedtoturnonthenextclockcycle.
TPS65287featuresasupervisorcircuitwhichmonitorseachbuck'soutputandthePGOODpinisassertedoncesequencingisdone.
ThePGOODpinisanopendrainoutput.
ThePGOODpinispulledlowwhenanybuckconverterispulledbelow85%ofthenominaloutputvoltage.
ThePGOODispulledupwhenallconverteroutputsaremorethan90%ofitsnominaloutputvoltage.
Thedefaultresettimeis100ms.
ThepolarityofthePGOODisactivehigh.
ThepushbuttonoperationhasbeendesignedtoallowforautomaticsystemstartwhentheinputsupplyisappliedortoprovideanintegratedON/OFFsystemmanagementwithouttheneedofadditionalexternalcomponents.
ThebehaviorofthedevicewilldependonthestatusoftheINTpin(seestart-upsignals).
TheUSBswitchprovidesupto2.
1-AofcurrentasrequiredbydownstreamUSBdevicesandsettingbyexternalresistor.
Whentheoutputloadexceedsthecurrent-limitthresholdorashortispresent,thePMUlimitstheoutputcurrenttoasafelevelbyswitchingintoaconstant-currentmodeandpullingtheovercurrentlogicoutputlow.
Whencontinuousheavyoverloadsandshortcircuitsincreasethepowerdissipationintheswitch,causingthejunctiontemperaturetorise,athermalwarningprotectioncircuitshutsofftheUSBswitchandallowsthebuckconverterstocarryonoperating.
Thedeviceimplementsaninternalthermalshutdowntoprotectitselfifthejunctiontemperatureexceeds160°C.
Thethermalshutdownforcesthedevicetostopoperatingwhenthejunctiontemperatureexceedsthermaltripthreshold.
Oncethedietemperaturedecreasesbelow140°C,thedevicereinitiatesthepowerupsequence.
Thethermalshutdownhysteresisis20°C.
ORDERINGINFORMATION(1)TAPACKAGE(2)PARTNUMBERTOP-SIDEMARKING-40°Cto125°C40-Pin(QFN)-RHAReelof2500TPS65287RHARTPS65287(1)Forthemostcurrentpackagingandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteatwww.
ti.
com.
(2)Packagedrawings,thermaldata,andsymbolizationareavailableatwww.
ti.
com/packaging.
2SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
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comSLVSBX2–MAY2013ThisintegratedcircuitcanbedamagedbyESD.
TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwithappropriateprecautions.
Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.
Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
FUNCTIONALBLOCKDIAGRAMCopyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
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comTYPICALAPPLICATION4SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
ti.
comSLVSBX2–MAY2013PINOUTCopyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
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comTERMINALFUNCTIONSNAMENO.
I/ODESCRIPTIONCurrentlimitsettingforBuck3.
FitaresistorfromthispintogroundtosetRLIM31Ithepeakcurrentlimitontheoutputinductor.
SoftstartpinforBuck3.
FitasmallceramiccapacitortothispintosettheSS32Iconvertersoftstarttime.
CompensationforBuck3.
FitaseriesRCcircuittothispintocompleteCOMP33Othecompensationcircuitofthisconverter.
FeedbackpinforBuck3.
Connectadividersetto0.
8VfromtheoutputofFB34Itheconvertertoground.
PB_IN5IPushbuttoninput(activelow)Oscillatorset.
ThisresistorsetsthefrequencyofinternalautonomousROSC6Iclock.
FeedbackpinforBuck1.
Connectadividersetto0.
8VfromtheoutputofFB17Itheconvertertoground.
CompensationpinforBuck1.
FitaseriesRCcircuittothispintocompleteCOMP18Othecompensationcircuitofthisconverter.
Soft-startpinforBuck1.
FitasmallceramiccapacitortothispintosettheSS19Iconvertersoft-starttime.
CurrentlimitsettingpinforBuck1.
FitaresistorfromthispintogroundtoRLIM110Isetthepeakcurrentlimitontheoutputinductor.
EnablepinforBuck1.
AhighsignalonthispinenablestheregulatorEN111IBuck.
Foradelayedstart-upaddasmallceramiccapacitorfromthispintoground.
BootstrapcapacitorforBuck1.
Fita47-nFceramiccapacitorfromthispinBST112totheswitchingnode.
VIN113IInputsupplyforBuck1.
Fita10-Fceramiccapacitorclosetothispin.
LX114,15OSwitchingnodeforBuck1LX216,17OSwitchingnodeforBuck2VIN218IInputsupplyforBuck2.
Fita10-Fceramiccapacitorclosetothispin.
BootstrapcapacitorforBuck2.
Fita47-nFceramiccapacitorfromthispinBST219totheswitchingnode.
EnablepinforBuck2.
Ahighsignalonthispinenablestheregulator.
ForEN220Iadelayedstart-upaddasmallceramiccapacitorfromthispintoground.
CurrentlimitsettingpinforBuck2.
FitaresistorfromthispintogroundtoRLIM221Isetthepeakcurrentlimitontheoutputinductor.
Soft-startpinforBuck2.
FitasmallceramiccapacitortothispintosettheSS222Iconvertersoft-starttime.
CompensationpinforBuck2.
FitaseriesRCcircuittothispintocompleteCOMP223Othecompensationcircuitofthisconverter.
FeedbackinputforBuck2.
Connectadividersetto0.
8VfromtheoutputFB224Ioftheconvertertoground.
ForcesPWMoperationinallconverterswhensethigh.
IflowconvertersF_PWM25IwilloperateinautomaticPFM/PWMmode.
INT26OOpendraininterruptoutputPowergood.
OpendrainoutputassertedlowafterallconvertersandPGOOD27Osequencedandwithinregulation.
Polarityisfactoryselectable(activehighdefault).
Internalsupply.
Connecta4.
7-μFto10-μFceramiccapacitorfromthispinV7V28Otoground.
Internalsupply.
Connecta3.
3-μFto10-μFceramiccapacitorfromthispinV3V29Otoground.
SetUSBcurrentlimitbyanexternalresistortoground.
ConnectthispinRSET30ItogroundtosetUSBcurrentlimittodefault1.
2A.
IC31IThispinshouldbeconnectedtoV7VpinUSB_VIN32IUSBswitchInputsupplyUSB_VO33OUSBswitchoutput6SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
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comSLVSBX2–MAY2013TERMINALFUNCTIONS(continued)NAMENO.
I/ODESCRIPTIONUSB_EN34IEnableinput,highturnsontheswitchUSB1faultflagoutput,opendrain,activelow.
AssertedwhenovercurrentUSB_nFAULT35Oorovertemperatureconditionisdetectedintheswitch.
LX336,37OSwitchingnodeforBuck3VIN338IInputsupplyforBuck3.
Fita10-Fceramiccapacitorclosetothispin.
BootstrapcapacitorforBuck3.
Fita47-nFceramiccapacitorfromthispinBST339totheswitchingnode.
EnablepinforBuck3.
Ahighsignalonthispinenablestheconverter.
ForEN340Iadelayedstart-upaddasmallceramiccapacitorfromthispintoground.
PowerPAD.
ConnecttosystemgroundforelectricalandthermalPowerPADconnection.
ABSOLUTEMAXIMUMRATINGS(1)overoperatingfree-airtemperaturerange(unlessotherwisenoted,allvoltagesarewithrespecttoGND)VoltagerangeatVIN1,VIN2,VIN3,LX1,LX2,LX3–0.
3to20VVoltagerangeatLX1,LX2,LX3(maximumwithstandvoltagetransient<10ns)–3to20VVoltageatBST1,BST2,BST3referencedtoLXpin–0.
3to7VVoltageatV7V,COMP1,COMP2,COMP3,USB_VIN,USB_VO,USB_EN,USB_nFAULT,–0.
3to7VPB_IN,INT,PGOODVoltageatV3V,RLIM1,RLIM2,RLIM3,EN1,EN2,EN3,SS1,SS2,SS3,FB1,FB2,FB3,–0.
3to3.
6VROSC,F_PWM,RSETVoltageatGND–0.
3to0.
3VTJOperatingjunctiontemperaturerange–40to125°CTSTGStoragetemperaturerange–55to150°C(1)Stressesbeyondthoselistedunder"absolutemaximumratings"maycausepermanentdamagetothedevice.
Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder"recommendedoperatingconditions"isnotimplied.
Exposuretoabsolute–maximum–ratedconditionsforextendedperiodsmayaffectdevicereliability.
RECOMMENDEDOPERATINGCONDITIONSoveroperatingfree-airtemperaturerange(unlessotherwisenoted)MINNOMMAXUNITVINInputoperatingvoltage4.
518VTAJunctiontemperature–4085°CELECTROSTATICDISCHARGE(ESD)PROTECTIONMINMAXUNITHumanbodymodel(HBM),PB_INpintoground2000VChargedevicemodel(CDM)500VPACKAGEDISSIPATIONRATINGS(1)TA=25°CTA=55°CTA=85°CPACKAGEθJA(°C/W)POWERRATING(W)POWERRATING(W)POWERRATING(W)RHA303.
332.
31.
3(1)BasedonJEDEC51.
5HIGHKenvironmentmeasuredona76.
2x114x0.
6-mmboardwiththefollowinglayerarrangement:(a)Toplayer:2OzCu,6.
7%coverage(b)Layer2:1OzCu,90%coverage(c)Layer3:1OzCu,90%coverage(d)Bottomlayer:2OzCu,20%coverageCopyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
ti.
comELECTRICALCHARACTERISTICSTJ=–40°Cto125°C,VIN=12V,fSW=500kHz(unlessotherwisenoted)PARAMETERTESTCONDITIONSMINTYPMAXUNITINPUTSUPPLYUVLOANDINTERNALSUPPLYVOLTAGEVINInputvoltagerange4.
518VIDDSDNShutdownENpin=lowforallconverters180AConvertersenabled,noloadBuck1=1.
2VQuiescent(push-buttonpull-upBuck2=1.
8V700Acurrentnotincluded)Buck3=3.
3VIDDQTA=25°C,F_PWM=LowConvertersenabled,noloadQuiescent,forcedPWM24mAF_PWM=HighRisingVIN4.
22UVLOVINundervoltagelockoutVFallingVIN4.
1UVLODEGLITCHBothedges110sV3p3Internalbiasingsupply3.
3VV7VInternalbiasingsupply6.
25VRisingV7V3.
8V7VUVLOUVLOforinternalV7VrailVFallingV7V3.
6V7VUVLO_DEGLITCHFallingedge120sBUCKCONVERTERS(ENABLECIRCUIT,CURRENTLIMIT,SOFT-STARTANDSWITCHINGFREQUENCY)V3p3=3.
2V-3.
4V,0.
66xVIH_ENxEnablethresholdhighVVENxrisingV3p3V3p3=3.
2V-3.
4V,0.
33xVIL_ENxEnablethresholdlowVVENxfallingV3p3V3p3=3.
2V-3.
4V,0.
66xVIH_F_PWMEnablethresholdhighVVENxrisingV3p3V3p3=3.
2V-3.
4V,0.
33xVIL_F_PWMEnablethresholdlowVVENxfallingV3p3ICHENPullupcurrentenablepin4AtDDischargetimeenablepinsPower-up10msISSSoft-startpincurrentsource5AFSW_BKConverterswitchingfrequencyrangeSetexternallywithresistor0.
32.
2MHzfSW_TOLInternaloscillatoraccuracyfSW=800kHz-1010%FEEDBACK,REGULATION,OUTPUTSTAGEVIN=12V,TA=25°C-1%0.
81%VFBFeedbackvoltageVVIN=4.
5Vto16V-2%0.
82%Minimumontime(currentsensetON_MIN135nsblanking)ILIMIT1Peakinductorcurrentlimitrange0.
754AILIMIT2Peakinductorcurrentlimitrange0.
753AILIMIT3Peakinductorcurrentlimitrange0.
753AMOSFET(BUCK1)OnresistanceofhighsideFETonH.
S.
Switch25°C,BOOT=6.
5V95mΩCH1OnresistanceoflowsideFETonL.
S.
Switch25°C,VIN=12V50mΩCH18SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
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comSLVSBX2–MAY2013ELECTRICALCHARACTERISTICS(continued)TJ=–40°Cto125°C,VIN=12V,fSW=500kHz(unlessotherwisenoted)PARAMETERTESTCONDITIONSMINTYPMAXUNITMOSFET(BUCK2)OnresistanceofhighsideFETonH.
S.
Switch25°C,BOOT=6.
5V120mΩCH2OnresistanceoflowsideFETonL.
S.
Switch25°C,VIN=12V80mΩCH2MOSFET(BUCK3)OnresistanceofhighsideFETonH.
S.
Switch25°C,BOOT=6.
5V120mΩCH3OnresistanceoflowsideFETonL.
S.
Switch25°C,VIN=12V80mΩCH3ERRORAMPLIFIERgMErroramplifiertransconductance-2A5A10A/VgmPS2COMPtoILXgmofBuck2and3(1)ILX=0.
5A8A/VPOWERGOODRESETGENERATOROutputfalling85ThresholdvoltageforbuckunderVUVBUCKX%Outputrising(PGwillbevoltage90asserted)tUV_deglitchDeglitchtime(bothedges)11mstON_HICCUPHiccupmodeONtimeVUVBUCKXasserted14msAllconvertersdisabled.
OncetOFF_HICCUPelapses,alltOFF_HICCUPHiccupmodeOFFtime20msconverterswillgothroughsequencingagain.
Outputrising(highsideFETwill106beforcedoff)ThresholdvoltageforbuckoverVOVBUCKX%voltageOutputfalling(highsideFETwill104beallowedtoswitch)MeasuredafterthelateroftRPminimumresetperiodBuck1orBuck3power-up100mssuccessfullyPB_IN0.
33xLow,V3p3=3.
2-3.
4VV3p3VPBPB_IN,P_OFF,thresholdV0.
66xHigh,V3p3=3.
2-3.
4VV3p3POFFInternalde-bouncetimeturn_onTPB_DEGLITCH20msandturn_offUSBSWITCHVINUSBUSBinputvoltagerange2.
56V0.
66xVIH_USB_ENUSB_ENhighlevelinputvoltageV3p3=3.
2-3.
4V,VUSB_ENrisingVV3p30.
33xVIL_USB_ENUSB_ENlowlevelinputvoltageV3p3=3.
2-3.
4V,VUSB_ENfallingVV3p3Staticdrain-sourceon-stateUSB_VIN=5VandRDS_USB135mresistanceIo_USB=0.
5A,TJ=25°CRSET=25k1.
651.
761.
87CurrentlimitthresholdandshortIOSRSET=40k1.
181.
261.
34AcircuitcurrentRSET=90k0.
470.
500.
53VUSB_nFAULTUSB_nFAULToutputvoltagelowIUSB_nFAULT=1mA150mV(1)Specifiedbydesign.
Copyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
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comELECTRICALCHARACTERISTICS(continued)TJ=–40°Cto125°C,VIN=12V,fSW=500kHz(unlessotherwisenoted)PARAMETERTESTCONDITIONSMINTYPMAXUNITUSB_IN=5V,CL=10F,TD_onTurn-ondelaytime1.
1msRL=100ΩTD_offTurn-offdelaytime1.
6msTIOSResponsetimetoshortcircuitUSB_IN=5V2sFaultassertionorde-assertionTDEGLITCH(OCP)Switchovercurrentfaultdeglitch8.
8msduetoover-currentconditionRDISDischargeresistanceUSB_IN=5V,USB_EN=0V130ΩTUSB_TRIPUSBthermaltrippointRisingtemperature130°CTUSB_HYSTUSBthermaltriphysteresisHysteresis20°CTHERMALSHUTDOWNTTRIPThermalshutdowntrippointRisingtemperature160°CTHYSTThermalshutdownhysteresisDevicere-starts20°CFigure1.
PowerSwitchesTestCircuitandVoltageWaveformsFigure2.
ResponseTimetoShortCircuitWaveformFigure3.
OutputVoltagevsCurrentLimitThreshold10SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
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comSLVSBX2–MAY2013TYPICALCHARACTERISTICSTA=25°C,VIN=12V,Buck1=1.
2V,Buck2=1.
8V,Buck3=3.
3V,L=4.
7H,fSW=500kHz(unlessotherwisenoted)Figure4.
Buck11.
2VEfficiency,ForcedPWMandPSMFigure5.
Buck11.
2VEfficiency,ForcedPWMFigure6.
Buck21.
8VEfficiency,ForcedPWNandPSMFigure7.
Buck21.
8VEfficiency,ForcedPWMFigure8.
Buck33.
3Efficiency,ForcedPWMandPSMFigure9.
Buck33.
3VEfficiency,ForcedPWMCopyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
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comTYPICALCHARACTERISTICS(continued)TA=25°C,VIN=12V,Buck1=1.
2V,Buck2=1.
8V,Buck3=3.
3V,L=4.
7H,fSW=500kHz(unlessotherwisenoted)Figure10.
LineRegulation:Buck1@1.
2V,1%ResistorFigure11.
LineRegulation:Buck2@1.
8V,1%ResistorFeedbackFeedbackFigure12.
LineRegulation:Buck3@3.
3V,1%ResistorFigure13.
LoadRegulation:Buck1@1.
2V,1%ResistorFeedbackFeedbackFigure14.
LoadRegulation:Buck2@1.
8V,1%ResistorFigure15.
LoadRegulation:Buck3@3.
3V,1%ResistorFeedbackFeedback12SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
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comSLVSBX2–MAY2013TYPICALCHARACTERISTICS(continued)TA=25°C,VIN=12V,Buck1=1.
2V,Buck2=1.
8V,Buck3=3.
3V,L=4.
7H,fSW=500kHz(unlessotherwisenoted)Figure16.
Power-UpAllConverters,NoLoadFigure17.
Power-DownAllConverters,NoLoadFigure18.
Power-UpAllConvertersandPGOOD,NoLoadFigure19.
DetailofStart-Up4.
7nFFittedtoAllEnablePinsFigure20.
Ripple,Buck1=0A,Buck2=0A,Buck3=0AFigure21.
TransientResponseBuck1Ripple,Buck1=3A,Buck2=2A,Buck3=2ACopyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
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comTYPICALCHARACTERISTICS(continued)TA=25°C,VIN=12V,Buck1=1.
2V,Buck2=1.
8V,Buck3=3.
3V,L=4.
7H,fSW=500kHz(unlessotherwisenoted)Figure22.
TransientResponseBuck1@1.
2V,1-3AStep,Figure23.
TransientResponseBuck2@1.
8V,1-2AStep,Co=68FCo=47FFigure24.
TransientResponseBuck3@3.
3V,1-2AStep,Figure25.
PSMOperation1.
2V,1.
8V,3.
3VCo=22FFigure26.
PSM/PWMTransition(Pin25PulledHigh)Figure27.
PSM/PWMTransition(Pin25PulledLow)14SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
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comSLVSBX2–MAY2013TYPICALCHARACTERISTICS(continued)TA=25°C,VIN=12V,Buck1=1.
2V,Buck2=1.
8V,Buck3=3.
3V,L=4.
7H,fSW=500kHz(unlessotherwisenoted)Figure28.
Buck1DynamicTransitionfromPSMtoPWM,Figure29.
Buck2DynamicTransitionfromPSMtoPWMC=68FC=47FFigure30.
Buck3DynamicTransitionfromPSMtoPWM,Figure31.
OverCurrentProtectionPGOODBuck1=1.
2VC=22FFigure32.
OverCurrentProtectionandPGOODBuck2=1.
8VFigure33.
OverCurrentProtectionandPGOODBuck3=3.
3VCopyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback15ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
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comTYPICALCHARACTERISTICS(continued)TA=25°C,VIN=12V,Buck1=1.
2V,Buck2=1.
8V,Buck3=3.
3V,L=4.
7H,fSW=500kHz(unlessotherwisenoted)Figure34.
HiccupRecover,Buck1=1.
2VFigure35.
HiccupRecover,Buck2=1.
8VFigure36.
HiccupRecover,Buck3=3.
3VFigure37.
USBSwitchStart-UpNoLoadFigure38.
USBSwitchStart-Up1ALoadFigure39.
USBSwitchCurrentLimitOperation16SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
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comSLVSBX2–MAY2013TYPICALCHARACTERISTICS(continued)TA=25°C,VIN=12V,Buck1=1.
2V,Buck2=1.
8V,Buck3=3.
3V,L=4.
7H,fSW=500kHz(unlessotherwisenoted)Figure40.
USBSwitchCurrentLimitRecoveryFigure41.
USBSwitchOutputReverseProtectionCopyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback17ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
ti.
comDETAILEDDESCRIPTIONAdjustableSwitchingFrequencyToselecttheinternalswitchingfrequency,connectaresistorfromROSCtoground.
Figure42showstherequiredresistanceforagivenswitchingfrequency.
Figure42.
ROSCvsSwitchingFrequency(1)18SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
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comSLVSBX2–MAY2013OutputInductorSelectionTocalculatethevalueoftheoutputinductor,useEquation2.
(2)KINDisacoefficientthatrepresentstheamountofinductorripplecurrentrelativetothemaximumoutputcurrent.
Ingeneral,KINDisnormallyfrom0.
1to0.
3forthemajorityofapplications.
Avalueof0.
1willimprovetheefficiencyatlightload,whileavalueof0.
3willprovidethelowestpossiblecostsolution.
Theripplecurrentis:(3)OutputCapacitorTherearetwoprimaryconsiderationsforselectingthevalueoftheoutputcapacitor.
Theoutputcapacitorsareselectedtomeetloadtransientandoutputripple'srequirements.
Ifaminimumtransientspecificationisrequiredusethefollowingequation:(4)Thefollowingequationcalculatestheminimumoutputcapacitanceneededtomeettheoutputvoltageripplespecification.
(5)WherefSWistheswitchingfrequency,VRIPPLEisthemaximumallowableoutputvoltageripple,andVRIPPLEistheinductorripplecurrent.
InputCapacitorAminimum10-FX7R/X5RceramicinputcapacitorisrecommendedtobeaddedbetweenVINandGNDofeachconverter.
TheinputcapacitormusthandletheRMSripplecurrentshowninthefollowingequation.
(6)BootstrapCapacitorThedevicehastwointegratedbootregulatorsandrequiresasmallceramiccapacitorbetweentheBSTandLXpinstoprovidethegatedrivevoltageforthehighsideMOSFET.
Thevalueoftheceramiccapacitorshouldbe0.
047F.
AceramiccapacitorwithanX7RorX5Rgradedielectricisrecommendedbecauseofthestablecharacteristicsovertemperatureandvoltage.
PushButtonThepushbuttoncontrolisanoptionalfeature.
TheusercanpoweronandoffthePMUwithoutpushbuttonbyconnectingthePBpintoGND.
Alternatively,theusercanpoweronandoffthePMUbyusingapushbuttonon/offcontroller.
Whenthe3.
3VLDO'soutputismorethan2.
6V,theinternallogicwilldetectthevoltageatPBtodeterminewhetherthePBpinisused.
WhenthevoltageatPBiszero,thePMUwillbeactivatedafterdetectingPBstayinglowforatleast20ms.
Ontheotherhand,ifthevoltageatPBishigh,thePMUwillkeepoffuntilthefirstsolidpushbuttonsignal.
Afteravalidpushbuttonsignalisasserted,thePMUwillfolloweachdc/dcconverter'sENandpowerupfromavalidpushbuttonsignal.
Duringpoweroff,oncethePBhasbeenpressed,INTisswitchedlow.
Thiswarnsthesystemtoshutdownallhousekeepingtasks.
Duringtheoffperiod,thePMUwillkeepoffuntilanewPBsignalisreceived.
This"off"statecanbeoverriddenbyrecyclingtheinputpower.
Copyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback19ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
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comTurnOnThroughPushButtonWhenthePBpinisnottiedtoGND,ahightolowtransitiononPBinitiatesthepoweronsequence.
PBmuststaylowforaperiodof20ms.
Oncecompletingthis20mS,theinternalENisassertedandthePMUisturnedon.
Figure43.
PushButtonTurnOnTurnOffThroughPushButtonAhightolowtransitiononPBinitiatesthepoweroffsequence.
PBmuststaylowforaperiodof20ms.
Aftercompleting20ms,thePMUpullsdowntheINTtoalertthesystemthatthePMUwillbeshutdownwithin1024ms.
After1024ms,thePMUwillbedisabledthroughaninternalEN,whichcanoverridetheindividualENofeachpowerconverter.
ThePMUwillkeepoffunlessthereisanotherfromhightolowtransitiononPBortheinputpowerisrecycled.
Figure44.
PushButtonTrunOffDelayedStart-UpIfadelayedstart-upisrequiredonanyofthebuckconvertersfitaceramiccapacitortotheENxpins.
Thedelayaddedis~0.
417mspernFconnectedtothepin.
NotethattheENpinshaveaweak1-Mpull-uptothe3V3rail.
20SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
ti.
comSLVSBX2–MAY2013Figure45.
DelayedStart-UpOut-of-PhaseOperationInordertoreduceinputripplecurrent,buck1andbuck2operate180degreeout-of-phase.
Thisenablesthesystemhavinglessinputripple,thentolowercomponentcost,saveboardspaceandreduceEMI.
Soft-StartTimeThedevicehasaninternalpull-upcurrentsourceof5Athatchargesanexternalsoft-startcapacitortoimplementaslowstarttime.
Equation7showshowtoselectasoft-startcapacitorbasedonanexpectedslowstarttime.
Thevoltagereference(VREF)is0.
8Vandthesoft-startchargecurrent(Iss)is5A.
Thesoft-startcircuitrequires1nFperaround167stobeconnectedattheSSpin.
A0.
8-mssoft-starttimeisimplementedforallconvertersfitting4.
7nFtotherelevantSSpin.
(7)ThePowerGoodcircuitforthebuckshasa11-mswatchdog.
Thereforethesoft-starttimeshouldbelowerthanthisvalue.
Itisrecommendednottoexceed5ms.
Copyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback21ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
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comAdjustingtheOutputVoltageTheoutputvoltageissetwitharesistordividerfromtheoutputnodetotheFBpin.
Itisrecommendedtouse1%toleranceorbetterdividerresistors.
Inordertoimproveefficiencyatlightload,startwithavaluecloseto40kfortheR1resistoranduseEquation8tocalculateR2.
(8)Figure46.
VoltageDividerCircuitLoopCompensationTPS65287isacurrentmodecontrolDC/DCconverter.
TheerroramplifierisatransconductanceamplifierwithagMof130A/V.
AtypicalcompensationcircuitcouldbetypeII(RcandCc)tohaveaphasemarginbetween60°and90°,ortypeIII(RcandCcandCfftoimprovetheconvertertransientresponse.
CRolladdsahighfrequencypoletoattenuatehigh-frequencynoisewhenneeded.
Itmayalsopreventnoisecouplingfromotherrailsifthereispossibilityofcrosscouplinginbetweenrailswhenlayoutisverycompact.
Figure47.
LoopCompensationScheme22SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
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comSLVSBX2–MAY2013Tocalculatetheexternalcompensationcomponentsfollowthefollowingsteps:TYPEIICIRCUITTYPEIIICIRCUITSelectswitchingfrequencythatisappropriateforapplicationdependingonL,Csizes,outputripple,EMIconcernsandetc.
Switchingfrequenciesaround500kHzTypeIIIcircuitrecommendedforyieldbesttradeoffbetweenperformanceandcost.
WhenswitchingfrequencieshigherthanusingsmallerLandC,switchingfrequencycanbe500kHz.
increased.
Tooptimizeefficiency,switchingfrequencycanbelowered.
Selectcrossoverfrequency(fc)tobeatleast1/5to1/10ofSuggestedSuggestedswitchingfrequency(fs).
fc=fs/10fc=fs/10SetandcalculateRc.
CalculateCcbyplacingacompensationzeroatorbeforetheconverterdominantpoleAddCRollifneededtoremovelargesignalcouplingtohighimpedanceCMPnode.
Makesurethatisatleasttwicethecrossoverfrequency.
CalculateCffcompensationzeroatlowfrequencytoboostthephasemarginatthecrossoverfrequency.
MakesureNAthatthezerofrequency(fzff)issmallerthanequivalentsoft-startfrequency(1/Tss).
SlopeCompensationThedevicehasabuilt-inslopecompensationramp.
Theslopecompensationcanpreventsubharmonicoscillationsinpeakcurrentmodecontrol.
PowerGoodThePGOODpinisanopendrainoutput.
ThePGOODpinispulledlowwhenanybuckconverterispulledbelow85%ofthenominaloutputvoltage.
ThePGOODispulledupwhenbothbuckconverters'outputsaremorethan90%ofitsnominaloutputvoltage.
Thedefaultresettimeis100ms.
ThepolarityofthePGOODisactivehigh.
Copyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback23ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
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comCurrentLimitProtectionTheTPS65287currentlimittripissetbythefollowingformulae:TYPEIICIRCUIT(9)(10)(11)Allconvertersoperateinhiccupmode:Onceanover-currentlastingmorethan11msissensedinanyoftheconverters,theywillshutdownfor11msandthenthestart-upsequencingwillbetriedagain.
Iftheoverloadhasbeenremoved,theconverterwillrampupandoperatenormally.
Ifthisisnotthecasetheconverterwillseeanotherover-currenteventandshuts-downagainrepeatingthecycle(hiccup)untilthefailureiscleared.
Ifanoverloadconditionlastsforlessthan11ms,onlytherelevantconverteraffectedwillshut-downandre-startandnoglobalhiccupmodewilloccur.
24SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
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comSLVSBX2–MAY2013OvervoltageTransientProtectionThedeviceincorporatesanovervoltagetransientprotection(OVP)circuittominimizevoltageovershoot.
TheOVPfeatureminimizestheoutputovershootbyimplementingacircuittocomparetheFBpinvoltagetoOVTPthresholdwhichis106%oftheinternalvoltagereference.
IftheFBpinvoltageisgreaterthantheOVTPthreshold,thehighsideMOSFETisdisabledpreventingcurrentfromflowingtotheoutputandminimizingoutputovershoot.
WhentheFBvoltagedropslowerthantheOVTPthresholdwhichis104%,thehighsideMOSFETisallowedtoturnonthenextclockcycle.
LowPower/PulseSkippingOperationWhenabucksynchronousconverteroperatesatlightloadorstandbyconditions,theswitchinglossesarethedominantsourceofpowerlosses.
Undertheseloadconditions,TPS65287usesapulseskippingmodulationtechniquetoreducetheswitchinglossesbykeepingthepowertransistorsintheoff-stateforseveralswitchingcycles,whilemaintainingaregulatedoutputvoltage.
Figure48showstheoutputvoltageandloadplustheinductorcurrent.
Figure48.
LowPower/PulseSkippingDuringtheburstmode,theconvertercontinuouslychargesuptheoutputcapacitoruntiltheoutputvoltagereachesacertainlimitthreshold.
Theoperationoftheconverterinthisintervalisequivalenttothepeakinductorcurrentmodecontrol.
Ineachswitchperiod,themainswitchisturnedonuntiltheinductorcurrentreachesthepeakcurrentlimitthreshold.
Astheloadincreasesthenumberofpulsesincreasestomakesurethattheoutputvoltagestayswithinregulationlimits.
Whentheloadisverylightthelowpowercontrollerhasazerocrossingdetectortoallowthelowsidemosfettooperateeveninlightloadconditions.
Thetransistorisnotdisabledatlightloads.
Azerocrossingdetectioncircuitwilldisableitwheninductorcurrentreverses.
Duringthewholeprocessthebodydiodedoesnotconductbutisusedasblockingdiodeonly.
Duringtheskippinginterval,theupperandlowertransistorsareturnedoffandtheconverterstaysinidlemode.
Theoutputcapacitorsaredischargedbytheloadcurrentuntilthemomentwhentheoutputvoltagedropstoalowthreshold.
Thechoiceofoutputfilterwillinfluencetheperformanceofthelowpowercircuit.
Themaximumrippleduringlowpowermodecanbecalculatedas:(12)WhereKRIPis1.
4forBuck1and0.
7forBuck2andBuck3.
TScanbecalculatedas:(13)USBSwitchTheUSBswitchisenabled(activehigh)withtheUSB_ENpin.
Theswitchhasatypicalresistanceof135m.
Ifacontinuousshort-circuitconditionisappliedtotheUSBswitchoutput,theUSBswitchwillshut-downonceitstemperaturereaches130°C,allowingforthebuckconverterstooperateunaffected.
OncetheUSBswitchcoolsdownitwillrestartautomatically.
Copyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback25ProductFolderLinks:TPS65287TPS65287SLVSBX2–MAY2013www.
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comFigure49.
USBSwitchProgrammingtheCurrent-LimitTheTPS65287usesaninternalregulationlooptoprovidearegulatedvoltageontheRLIMpin.
Therecommended1%resistorrangeforRLIMis18kΩ≤RLIM≤232kΩtoensurestabilityoftheinternalregulationloop.
Manyapplicationsrequirethattheminimumcurrentlimitisaboveacertaincurrentlevelorthatthemaximumcurrentlimitisbelowacertaincurrentlevel,soitisimportanttoconsiderthetoleranceoftheover-currentthresholdwhenselectingavalueforRLIM.
ThefollowingequationsandFigure50canbeusedtocalculatetheresultingover-currentforagivenexternalresistorvalue(RSET).
Theequationsdonotaccountfortoleranceduetoexternalresistorvariation,soitisimportanttoaccountforthistolerancewhenselectingRSET.
ThetracesroutingtheRSETresistortotheTPS65287shouldbeasshortaspossibletoreduceparasiticeffectsonthecurrent-limitaccuracy.
Figure50.
Current-LimitvsRLIM26SubmitDocumentationFeedbackCopyright2013,TexasInstrumentsIncorporatedProductFolderLinks:TPS65287TPS65287www.
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comSLVSBX2–MAY2013ThermalShutdownThedeviceimplementsaninternalthermalshutdowntoprotectitselfifthejunctiontemperatureexceeds160°C.
Thethermalshutdownforcesthedevicetostopswitchingwhenthejunctiontemperatureexceedsthermaltripthreshold.
Oncethedietemperaturedecreasesbelow140°C,thedevicereinitiatesthepowerupsequence.
Thethermalshutdownhysteresisis20°C.
3.
3-Vand6.
5LDORegulatorsThefollowingceramiccapacitor(X7R/X5R)shouldbeconnectedascloseaspossibletothedescribedpins:4.
7Fto10FforV7Vpin283.
3Fto10FforV3Vpin29LayoutRecommendationLayoutisacriticalportionofPMICdesigns.
PlacetracingforoutputvoltageandLXonthetoplayerandaninnerpowerplaneforVIN.
FitalsoonthetoplayerconnectionsfortheremainingpinsofthePMICandalargetopsideareafilledwithground.
Thetoplayergroundareashouldbeconnectedtotheinternalgroundlayer(s)usingviasattheinputbypasscapacitor,theoutputfiltercapacitoranddirectlyundertheTPS65287devicetoprovideathermalpathfromthePowerPadlandtoground.
Foroperationatfullratedload,thetopsidegroundareatogetherwiththeinternalgroundplane,mustprovideadequateheatdissipatingarea.
Thereareseveralsignalspathsthatconductfastchangingcurrentsorvoltagesthatcaninteractwithstrayinductanceorparasiticcapacitancetogeneratenoiseordegradethepowersuppliesperformance.
Tohelpeliminatetheseproblems,theVINpinshouldbebypassedtogroundwithalowESRceramicbypasscapacitorwithX5RorX7Rdielectric.
Careshouldbetakentominimizetheloopareaformedbythebypasscapacitorconnections,theVINpins,andthegroundconnections.
SincetheLXconnectionistheswitchingnode,theoutputinductorshouldbelocatedclosetotheLXpins,andtheareaofthePCBconductorminimizedtopreventexcessivecapacitivecoupling.
TheoutputfiltercapacitorgroundshouldusethesamepowergroundtraceastheVINinputbypasscapacitor.
Trytominimizethisconductorlengthwhilemaintainingadequatewidth.
ThecompensationshouldbeascloseaspossibletotheCMPxpins.
TheCMPxandROSCpinsaresensitivetonoisesothecomponentsassociatedtothesepinsshouldbelocatedascloseaspossibletotheICandroutedwithminimallengthsoftrace.
Copyright2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback27ProductFolderLinks:TPS65287PACKAGEOPTIONADDENDUMwww.
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com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesTPS65287RHARACTIVEVQFNRHA402500RoHS&GreenNIPDAULevel-3-260C-168HR-40to125TPS65287TPS65287RHATPREVIEWVQFNRHA40250RoHS&GreenNIPDAULevel-3-260C-168HR-40to125TPS65287(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
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016.
46.
36.
31.
112.
016.
0Q2PACKAGEMATERIALSINFORMATIONwww.
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com4-Jul-2018PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)TPS65287RHARVQFNRHA402500367.
0367.
038.
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