BOOT11kk99

TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011FixedFrequency,99%DutyCyclePeakCurrentModeNotebookSystemPowerControllerCheckforSamples:TPS51220A-Q11FEATURES2QualifiedforAutomotiveApplicationsPowergoodOutputforEachChannelInputVoltageRange:4.
5Vto32VOCL/OVP/UVP/UVLOProtections(OVPDisableOption)OutputVoltageRange:1Vto12VThermalShutdown(Non-Latch)SelectableLightLoadOperation(Continuous/AutoSkip/Out-Of-AudioSkip)OutputDischargeFunction(DisableOption)ProgrammableDroopCompensationLatch-Upexceeds100mAperJESD78-ClassIVoltageServoAdjustableSoftStartIntegratedBootStrapMOSFETSwitch200-kHzto1-MHzFixed-FrequencyPWMQFN-32(RTV)PackageSelectableCurrent/D-CAPModeAPPLICATIONSArchitectureI/OBus180°PhaseShiftBetweenChannelsPointofLoadinLCDTV,MFPResistororInductorDCRCurrentSensingAdaptiveZeroCrossingCircuitDESCRIPTIONTheTPS51220A-Q1isadualsynchronousbuckregulatorcontrollerwithtwoLDOs.
Itisoptimizedfor5-V/3.
3-Vsystemcontroller,enablingdesignerstocosteffectivelycomplete2-cellto4-cellnotebooksystempowersupply.
TheTPS51220A-Q1supportshighefficiency,fasttransientresponse,and99%dutycycleoperation.
Itsupportssupplyinputvoltagerangingfrom4.
5Vto32V,andoutputvoltagesfrom1Vto12V.
Twotypesofcontrolschemescanbechosendependingontheapplication.
PeakcurrentmodesupportsstabilityoperationwithlowerESRcapacitorandoutputaccuracy.
TheD-CAPmodesupportsfasttransientresponse.
Thehighduty(99%)operationandthewideinput/outputvoltagerangesupportsflexibledesignforsmallmobilePCsandawidevarietyofotherapplications.
Thefixedfrequencycanbeadjustedfrom200kHzto1MHzbyaresistor,andeachchannelruns180°out-of-phase.
TheTPS51220A-Q1canalsosynchronizetotheexternalclock,andtheinterleavingratiocanbeadjustedbyitsduty.
TheTPS51220A-Q1isavailableinthe32-pin5*5/4*4QFNpackageandisspecifiedfrom–40°Cto105°C.
1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Out-Of-Audio,D-CAP,PowerPADaretrademarksofTexasInstruments.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2011,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comTYPICALAPPLICATIONCIRCUIT2SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011Thesedeviceshavelimitedbuilt-inESDprotection.
TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
FUNCTIONALBLOCKDIAGRAMCopyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comABSOLUTEMAXIMUMRATINGS(1)overoperatingfree-airtemperaturerange(unlessotherwisenoted)TPS51220A-Q1UNITVIN–0.
3to34VBST1,VBST2–0.
3to39VBST1,VBST2(3)–0.
3to7SW1,SW2–7to34Inputvoltagerange(2)VCSP1,CSP2,CSN1,CSN2–1to13.
5EN,EN1,EN2,VFB1,VFB2,TRIP,SKIPSEL1,SKIPSEL2,FUNC–0.
3to7V5SW–1to7V5SW(toVREG5)(4)–7to7DRVH1,DRVH2–7to39VDRVH1,DRVH2(3)–0.
3to7VOutputvoltagerange(2)DRVL1,DRVL2,COMP1,COMP2,VREG5,RF,VREF2,–0.
3to7VPGOOD1,PGOOD2VREG3–0.
3to3.
6VTJJunctiontemperature150°CTstgStoragetemperature–55to150°C(1)StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.
Thesearestressratingsonlyandfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperatingconditionsisnotimplied.
Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
(2)Allvoltagevaluesarewithrespecttothenetworkgroundterminalunlessotherwisenoted.
(3)VoltagevaluesarewithrespecttothecorrespondingSWterminal.
(4)WhenENishighandV5SWisgrounded,orvoltageisappliedtoV5SWwhenENislow.
DISSIPATIONRATINGS(2oz.
TraceandCopperPadwithSolder)TACOMMENDEDOPERATINGCONDITIONSMINTYPMAXUNITVIN4.
532VSupplyvoltageV5SW–0.
86VBST1,VBST2–0.
137DRVH1,DRVH2–4.
37DRVH1,DRVH2(wrtSW1,2)–0.
16DRVH1,DRVH2(negativeovershoot-6VfortCOMP1,COMP2,VREG5,RF,VREF2,PGOOD1,PGOOD2,SKIPSEL1,SKIPSEL2,–0.
16FUNCVREG3–0.
13.
5TAOperatingfree-airtemperature–40105°C4SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011ORDERINGINFORMATIONORDERABLETAPACKAGE(1)PARTTOP-SIDEMARKINGNUMBER-40°Cto105°CQFN–RTVReelof3000TPS51220ATRTVRQ151220AT(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteatwww.
ti.
com.
ESDRATINGSTABLEPARAMTERVALUEUNITHumanBodyModel(HBM)2000VESDCharged-DeviceModel500VMachineModel(MM)100VELECTRICALCHARACTERISTICSoveroperatingfree-airtemperaturerange,EN=3.
3V,VIN=12V,V5SW=5V(unlessotherwisenoted)PARAMETERTESTCONDITIONSMINTYPMAXUNITSUPPLYCURRENTVINshutdowncurrent,TA=25°C,IVINSDNVINshutdowncurrent715μANoLoad,EN=0V,V5SW=0VVINstandbycurrent,TA=25°C,NoLoad,IVINSTBYVINStandbyCurrent80120μAEN1=EN2=V5SW=0VVbatstandbycurrent,TA=25°C,NoLoadIVBATSTBYVBATStandbyCurrent500μASKIPSEL2=2V,EN2=open,EN1=V5SW=0V(1)TRIP=5V0.
8mAV5SWcurrent,TA=25°C,NoLoad,IV5SWV5SWSupplyCurrentENx=5V,VFBx=1.
05VTRIP=0V0.
9mAVREF2OUTPUTI(VREF2)COMPx=1.
8V,TA=25°C–5050nARDISCHGCSNxDischargeResistanceENx=0V,CSNx=0.
5V,TA=25°C2040(1)Specifiedbydesign.
DetailexternalconditionfollowsapplicationcircuitofFigure57.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comELECTRICALCHARACTERISTICS(continued)overoperatingfree-airtemperaturerange,EN=3.
3V,VIN=12V,V5SW=5V(unlessotherwisenoted)PARAMETERTESTCONDITIONSMINTYPMAXUNITVOLTAGETRANSCONDUCTANCEAMPLIFIERgMvGainTA=25°C500μSVIDDifferentialInputVoltageRange–3030mVTA=0to105°C2733μAICOMPSINKCOMPMaximumSinkCurrentCOMPx=1.
8VTA=–40to2233μA105°CICOMPSRCCOMPMaximumSourceCurrentCOMPx=1.
8V–33–43μAVCOMPCOMPClampVoltage2.
182.
222.
26VVCOMPNCOMPNegativeClampVoltage1.
731.
771.
81VCURRENTAMPLIFIERTRIP=0V/2V,CSNx=5V,TA=25°C(2)3.
333GCGainTRIP=3.
3V/5V,CSNx=5V,TA=25°C(2)1.
667VICCommonmodeInputVoltageRange013VVIDDifferentialInputVoltageRangeTA=25°C–7575mVPOWERGOODPGinfromlower92.
5%95%97.
5%VTHPGPGthresholdPGinfromhigher102.
5%105%107.
5%PGhysteresis5%IPGPGsinkcurrentPGOOD=0.
5V5mAIPG(LK)PGleakcurrentPGOOD=5V01AtPGDLYPGOODdelayDelayforPGin0.
81.
01.
2msSOFTSTARTtSSDYLSoftStartDelayDelayforSoftStart,ENx=HitoSS-rampstarts200μstSSSoftStartTimeInternalSoftStart960μsFREQUENCYANDDUTYCONTROLfSWSwitchingFrequencyRF=330k273303333kHzLotoHi0.
71.
32VVTHRFRFThresholdHysteresis0.
2VfSYNCSyncInputFrequencyRange(2)2001000kHzV(DRVH)=90%to10%,NoLoad,CCM/OOA(2)120nstON(min)MinimumOnTimeV(DRVH)=90%to10%,NoLoad,Auto-skip160250nstOFF(min)MinimumOffTimeV(DRVH)=10%to90%,NoLoad290400nsDRVH-offtoDRVL-on103050nstDDeadtimeDRVL-offtoDRVH-on304070nsVDTHDRVH-offthresholdDRVHtoGND(2)1VVDTLDRVL-offthresholdDRVLtoGND(2)1V(2)Specifiedbydesign.
Notproductiontested.
6SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011ELECTRICALCHARACTERISTICS(continued)overoperatingfree-airtemperaturerange,EN=3.
3V,VIN=12V,V5SW=5V(unlessotherwisenoted)PARAMETERTESTCONDITIONSMINTYPMAXUNITCURRENTSENSERTVpackage,283135TA=0to105°CRSNTRIP=0V/2V,2V6Vpackage,283134TA=0to105°CCurrentlimitthresholdVOCL-ULVmV(ultra-lowvoltage)TA=–40to273137105°CTA=0to105°C273136TRIP=0V/2V,0.
95V6VTA=–40to253142105°CTA=0to105°C566065TRIP=3.
3V/5V,2V6VTA=–40to556068105°CCurrentlimitthresholdVOCL-LVmV(lowvoltage)TA=0to105°C556067TRIP=3.
3V/5V,TA=–40to0.
95V6V546072105°CPositive5VZCAJAuto-Zerocrossadjustableoffsetrange0.
95V6V,Auto-skipmVNegative–5VZCZerocrossdetectioncomparatorOffset0.
95V6V,OOA–504mVTA=0to105°C–23–31–40NegativecurrentlimitthresholdTRIP=0V/2V,0.
95V6V–22–31–44105°CmVTA=0to105°C–50–60–73NegativecurrentlimitthresholdTRIP=3.
3V/5V,0.
95V6V–49–60–77105°COUTPUTDRIVERSSource,V(VBST-DRVH)=0.
1V1.
75RDRVHDRVHresistanceSink,V(DRVH-SW)=0.
1V13Source,V(VREG5-DRVL)=0.
1V1.
34RDRVLDRVLresistanceSink,V(DRVL-GND)=0.
1V0.
72UVP,OVPANDUVLOVOVPOVPTripThresholdOVPdetect110%115%120%tOVPDLYOVPPropDelay1.
5μsVUVPUVPTripThresholdUVPdetect65%70%73%tUVPDLYUVPDelay0.
811.
2msWakeup1.
71.
81.
9VVUVREF2VREF2UVLOThresholdHysteresis75100125mVWakeup33.
13.
2VUVREG3VREG3UVLOThresholdVHysteresis0.
100.
150.
20Wakeup4.
14.
24.
3VVUVREG5VREG5UVLOThresholdHysteresis0.
350.
400.
44VCopyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comELECTRICALCHARACTERISTICS(continued)overoperatingfree-airtemperaturerange,EN=3.
3V,VIN=12V,V5SW=5V(unlessotherwisenoted)PARAMETERTESTCONDITIONSMINTYPMAXUNITINTERFACEANDLOGICTHRESHOLDWakeup0.
811.
2VENENThresholdVHysteresis0.
10.
20.
3IENLKENleakcurrentEN=0V,orEN=3.
3V-11μAWakeup0.
450.
500.
55VEN12EN1/EN2ThresholdVHysteresis0.
10.
20.
3VEN12SSEN1/EN2SSStartThresholdSS-rampstartthresholdatexternalsoftstart1VVEN12SSENDEN1/EN2SSEndThresholdSS-Endthresholdatexternalsoftstart(3)2VIEN12EN1/EN2SourceCurrentVEN1/EN2=0V1.
622.
4μAContinuous1.
5AutoSkip1.
92.
1VSKIPSELSKIPSEL1/SKIPSEL2SettingVoltageVOOASkip(min1/8Fsw)3.
23.
4OOASkip(min1/16Fsw)3.
8V(OCL-ULV),DischargeON1.
5V(OCL-ULV),DischargeOFF1.
92.
1VTRIPTRIPSettingVoltageVV(OCL-LV),DischargeOFF3.
23.
4V(OCL-LV),DischargeON3.
8Currentmode,OVPenable1.
5D-CAPmode,OVPdisable1.
92.
1VFUNCFUNCSettingVoltageVD-CAPmode,OVPenable3.
23.
4Currentmode,OVPdisable3.
8TRIP=0V–11ITRIPTRIPInputCurrentμATRIP=5V–11SKIPSELx=0V–0.
50.
5ISKIPSELSKIPSELInputCurrentμASKIPSELx=5V–0.
50.
5BOOTSTRAPSWVFBSTForwardVoltageVVREG5-VBST,IF=10mA,TA=25°C0.
100.
20VIBSTLKVBSTLeakageCurrentVVBST=37V,VSW=32V0.
011.
5μATHERMALSHUTDOWNShutdowntemperature(3)150TSDNThermalSDNThreshold°CHysteresis(3)10(3)Specifiedbydesign.
Notproductiontested.
8SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011DEVICEINFORMATIONPINFUNCTIONSPINI/ODESCRIPTIONNAMENO.
DRVH11High-sideMOSFETgatedriveroutputs.
Source1.
7,sink1.
0,SW-nodereferencedfloatingdriver.
DriveOvoltagecorrespondstoVBSTtoSWvoltage.
DRVH224SW225I/OHigh-sideMOSFETgatedriverreturns.
SW132Alwaysalive3.
3V,10mAlowdropoutlinearregulatoroutput.
Bypassto(signal)GNDwithmorethan1-μFVREG322Oceramiccapacitance.
RunsfromVINsupplyorfromVREG5whenitisswitchedovertoV5SWinput.
EN14Channel1andchannel2SMPSEnablePins.
Whenturningon,applygreaterthan0.
55Vandlessthan6V,Iorleavefloating.
ConnecttoGNDtodisable.
Adjustablesoft-startcapacitancetobeattachedhere.
EN221PGOOD15Powergoodwindowcomparatoroutputsforchannel1andchannel2.
TherecommendedappliedvoltageOshouldbelessthan6V,andtherecommendedpull-upresistancevalueisfrom100kto1M.
PGOOD220SKIPSEL16Skipmodeselectionpin.
GND:ContinuousconductionmodeIVREF2:AutoSkipSKIPSEL219VREG3:OOAAutoSkip,maximum7skips(suitableforfsw<400kHz)VREG5:OOAAutoSkip,maximum15skips(suitableforequaltoorgreaterthan400kHz)CSP17Currentsensecomparatorinputs(+).
AnRCnetworkwithhighqualityX5RorX7RceramiccapacitorshouldI/ObeusedtoextractvoltagedropacrossDCR.
0.
1-μFisagoodvaluetostartthedesign.
SeethecurrentCSP218sensingschemesectionformoredetails.
CSN18Currentsensecomparatorinputs(–).
Seethecurrentsensingschemesection.
UsedaspowersupplyfortheIcurrentsensecircuitfor5Vorhigheroutputvoltagesetting.
Also,usedforoutputdischargeterminal.
CSN217VFB19SMPSvoltagefeedbackInputs.
Connectthefeedbackresistorsdivider,andshouldbereferredto(signal)IGND.
VFB216COMP110Loopcompensationpinforcurrentmode(erroramplifieroutput).
ConnectR(andCifrequired)fromthispintoVREF2forproperloopcompensationwithcurrentmodeoperation.
RampcompensationadjustablepinforID-CAPmode,connectRfromthispintoVREF2.
10kisagoodvaluetostartthedesign.
6kto20kCOMP215canbechosen.
SeetheD-CAPMODEsectionformoredetails.
Frequencysettingpin.
Connectafrequencysettingresistorto(signal)GND.
ConnecttoanexternalclockforRF3I/Osynchronization.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comPINFUNCTIONS(continued)PINI/ODESCRIPTIONNAMENO.
ControlarchitectureandOVPfunctionsselectionpin.
GND:Currentmode,OVPenableFUNC11IVREF2:D-CAPmode,OVPdisableVREG3:D-CAPmode,OVPenableVREG5:Currentmode,OVPdisableVREF213O2-Vreferenceoutput.
Bypassto(signal)GNDwith0.
22-μFofceramiccapacitance.
Overcurrenttriplevelanddischargemodeselectionpin.
GND:V(OCL-ULV),dischargeonTRIP14IVREF2:V(OCL-ULV),dischargeoffVREG3:V(OCL-LV),dischargeoffVREG5:V(OCL-LV),dischargeonVREF2andVREG5linearregulatorsenablepin.
Whenturningon,applygreaterthan1.
2Vandlessthan6EN12IV.
ConnecttoGNDtodisable.
VBST131Supplyinputsforhigh-sideN-channelFETdriver(bootstrapterminal).
Connectacapacitor(0.
1-μForIgreaterisrecommended)fromthispintorespectiveSWterminal.
AdditionalSBdiodefromVREG5tothisVBST226pinisanoptional.
DRVL130OLow-sideMOSFETgatedriveroutputs.
Source1.
3,sink0.
7,andGNDreferenceddriver.
DRVL227VREG5switchoverpowersupplyinputpin.
WhenEN1ishigh,PGOOD1indicatesGOODandV5SWvoltageishigherthan4.
83V,switch-overfunctionisenabled.
V5SW2INote:Whenswitch-overisenabled,VREG5outputvoltageisapproximatelyequaltotheV5SWinputvoltage.
5-V,100-mAlowdropoutlinearregulatoroutput.
Bypassto(power)GNDusinga10-μFceramiccapacitor.
RunsfromVINsupply.
InternallyconnectedtoVBSTandDRVL.
ShutsoffwithEN.
SwitchesovertoV5SWVREG529Owhen4.
83Voraboveisprovided.
Note:Whenswitch-over(seeaboveV5SW)isenabled,VREG5outputvoltageisapproximatelyequaltoV5SWinputvoltage.
VIN23ISupplyinputfor5-Vand3.
3-Vlinearregulator.
TypicallyconnectedtoVBAT.
GND28–Ground10SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011TYPICALCHARACTERISTICSINPUTVOLTAGESHUTDOWNCURRENTINPUTVOLTAGESHUTDOWNCURRENTvsvsINPUTVOLTAGEJUNCTIONTEMPERATUREFigure1.
Figure2.
INPUTVOLTAGESTANDBYCURRENTINPUTVOLTAGESTANDBYCURRENTvsvsJUNCTIONTEMPERATUREINPUTVOLTAGEFigure3.
Figure4.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comTYPICALCHARACTERISTICS(continued)NOLOADBATTERYCURRENTNOLOADBATTERYCURRENTvsvsINPUTVOLTAGEINPUTVOLTAGEFigure5.
Figure6.
BATTERYCURRENTVREF2OUTPUTVOLTAGEvsvsINPUTVOLTAGEOUTPUTCURRENTFigure7.
Figure8.
12SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011TYPICALCHARACTERISTICS(continued)VREG3OUTPUTVOLTAGEVREG5OUTPUTVOLTAGEvsvsOUTPUTCURRENTOUTPUTCURRENTFigure9.
Figure10.
SWITCHINGFREQUENCYFORWARDVOLTAGEOFBOOSTSWvsvsJUNCTIONTEMPERATUREJUNCTIONTEMPERATUREFigure11.
Figure12.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comTYPICALCHARACTERISTICS(continued)OVP/UVPTHRESHOLDVOLTAGEVBSTLEAKAGECURRENTvsvsJUNCTIONTEMPERATUREJUNCTIONTEMPERATUREFigure13.
Figure14.
CURRENTLIMITTHRESHOLDCURRENTLIMITTHRESHOLDvsvsJUNCTIONTEMPERATUREJUNCTIONTEMPERATUREFigure15.
Figure16.
14SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011TYPICALCHARACTERISTICS(continued)5-VOUTPUTVOLTAGE3.
3-VOUTPUTVOLTAGEvsvsINPUTVOLTAGEINPUTVOLTAGEFigure17.
Figure18.
5-VEFFICIENCY5-VEFFICIENCYvsvsOUTPUTCURRENTOUTPUTCURRENTFigure19.
Figure20.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback15ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comTYPICALCHARACTERISTICS(continued)3.
3-VEFFICIENCY3.
3-VEFFICIENCYvsvsOUTPUTCURRENTOUTPUTCURRENTFigure21.
Figure22.
5-VSWITCHINGFREQUENCY3.
3-VSWITCHINGFREQUENCYvsvsOUTPUTCURRENTOUTPUTCURRENTFigure23.
Figure24.
16SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011TYPICALCHARACTERISTICS(continued)5-VOUTPUTVOLTAGE3.
3-VOUTPUTVOLTAGEvsvsOUTPUTCURRENTOUTPUTCURRENTFigure25.
Figure26.
5-VOUTPUTVOLTAGE3.
3-VOUTPUTVOLTAGEvsvsOUTPUTCURRENTOUTPUTCURRENTFigure27.
Figure28.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback17ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comTYPICALCHARACTERISTICS(continued)5-VOUTPUTVOLTAGE3.
3-VOUTPUTVOLTAGEvsvsOUTPUTCURRENTOUTPUTCURRENTFigure29.
Figure30.
5.
0-VBODE-PLOT–GAINANDPHASE3.
3-VBODE-PLOT–GAINANDPHASEvsvsFREQUENCYFREQUENCYFigure31.
Figure32.
18SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011TYPICALCHARACTERISTICS(continued)5.
0-VSWITCH-OVERWAVEFORMSFigure33.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback19ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comTYPICALCHARACTERISTICS5.
0-VSTART-UPWAVEFORMS3.
3-VSTART-UPWAVEFORMSFigure34.
Figure35.
5.
0-VSOFT-STOPWAVEFORMS3.
3-VSOFT-STOPWAVEFORMSFigure36.
Figure37.
20SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011TYPICALCHARACTERISTICS(continued)5.
0-VLOADTRANSIENTRESPONSE3.
3-VLOADTRANSIENTRESPONSEFigure38.
Figure39.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback21ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comDETAILEDDESCRIPTIONENABLEANDSOFTSTARTWhenENisLow,theTPS51220A-Q1isintheshutdownstate.
Onlythe3.
3-VLDOstaysalive,andconsumes7μA(typically).
WhenENbecomesHigh,theTPS51220A-Q1isinthestandbystate.
The2-Vreferenceandthe5-VLDObecomeenabled,andconsumeabout80μAwithnoloadcondition,andarereadytoturnonSMPSchannels.
EachSMPSchannelisturnedonwhenENxbecomesHigh.
AfterENxissettohigh,theTPS51220A-Q1beginsthesoftstartsequence,andrampsuptheoutputvoltagefromzerotothetargetvoltagein0.
96ms.
However,ifaslowersoft-startisrequired,anexternalcapacitorcanbetiedfromtheENxpintoGND.
Inthiscase,theTPS51220A-Q1chargestheexternalcapacitorwiththeintegrated2-μAcurrentsource.
Anapproximateexternalsoft-starttimewouldbetEX-SS=CEX/IEN12,whichmeansthetimefromENx=1VtoENx=2V.
Therecommendcapacitanceismorethan2.
2nF.
Figure40.
EnableandSoft-startTimingTable1.
EnableLogicStatesENEN1EN2VREG3VREF2VREG5CH1CH2GNDDon'tCareDon'tCareONOffOffOffOffHiLoLoONONONOffOffHiHiLoONONONONOffHiLoHiONONONOffONHiHiHiONONONONONPRE-BIASEDSTART-UPTheTPS51220A-Q1supportsapre-biasedstartupbypreventingnegativeinductorcurrentduringsoft-startwhentheoutputcapacitorholdssomecharge.
TheinitialDRVHsignalwaitsuntilthevoltagefeedbacksignalbecomesgreaterthantheinternalreferencerampingupbythesoft-startfunction.
Afterthat,thestart-upoccursinthesamewaythesoft-startconditionfullydischarges,regardlessoftheSKIPSELxselection.
22SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH20113.
3-V,10-mALDO(VREG3)A3.
3-V,10-mA,linearregulatorisintegratedintheTPS51220A-Q1.
ThisLDOservicessomeoftheanalogcircuitinthedeviceandprovidesahandystandbysupplyfor3.
3-VAlwaysOnvoltageinthenotebooksystem.
Applya2.
2-μF(atleast1-μF),highqualityX5RorX7RceramiccapacitorfromVREG3to(signal)GNDinadjacenttothedevice.
2-V,100-μASink/SourceReference(VREF2)Thisvoltageisusedforthereferenceoftheloopcompensationnetwork.
Applya0.
22-μF(atleast0.
1-μF),high-qualityX5RorX7RceramiccapacitorfromVREF2to(signal)GNDinadjacenttothedevice.
5.
0-V,100-mALDO(VREG5)A5.
0-V,100-mA,linearregulatorisintegratedintheTPS51220A-Q1.
ThisLDOservicesthemainanalogsupplyrailandprovidesthecurrentforgatedriversuntilswitch-overfunctionbecomesenable.
Applya10-μF(atleast4.
7-μF),high-qualityX5RorX7RceramiccapacitorfromVREG5to(power)GNDinadjacenttothedevice.
VREG5SWITCHOVERWhenEN1ishigh,PGOOD1indicatesGOODandavoltageofmorethan4.
83VisappliedtoV5SW,theinternal5V-LDOisshutoffandtheVREG5isshortedtoV5SWbyaninternalMOSFETafteran7.
7-msdelay.
WhentheV5SWvoltagebecomeslowerthan4.
65V,EN1becomeslow,orPGOOD1indicatesBAD,theinternalswitchisturnedoff,andtheinternal5V-LDOresumesimmediately.
BASICPWMOPERATIONSThemaincontrolloopoftheSMPSisdesignedasafixedfrequency,pulsewidthmodulation(PWM)controller.
Itsupportstwocontrolschemes;apeakcurrentmodeandaproprietaryD-CAPmode.
Currentmodeachievesstableoperationwithanytypeofoutputcapacitors,includinglowESRcapacitor(s)suchasceramicorspecialtypolymercapacitors.
D-CAPmodedoesnotrequireanexternalcompensationcircuit,andissuitableforrelativelylargerESRcapacitor(s)configuration.
ThesecontrolschemesareselectedwithFUNCpin.
SeeTable4.
CURRENTMODEThecurrentmodeschemeusestheoutputvoltageinformationandtheinductorcurrentinformationtoregulatetheoutputvoltage.
TheoutputvoltageinformationissensedbyVFBxpin.
Thesignaliscomparedwiththeinternal1-Vreferenceandthevoltagedifferenceisamplifiedbyatransconductanceamplifier(VFB-AMP).
TheinductorcurrentinformationissensedbyCSPxandCSNxpins.
Thevoltagedifferenceisamplifiedbyanothertransconductanceamplifier(CS-AMP).
TheoutputoftheVFB-AMPindicatesthetargetpeakinductorcurrent.
Iftheoutputvoltagedecreases,theTPS51220A-Q1increasesthetargetinductorcurrenttoraisetheoutputvoltage.
Alternatively,iftheoutputvoltagerises,theTPS51220A-Q1decreasesthetargetinductorcurrenttoreducetheoutputvoltage.
Atthebeginningofeachclockcycle,thehigh-sideMOSFETisturnedon,orbecomes'ON'state.
Thehigh-sideMOSFETisturnedoff,orbecomesOFFstate,aftertheinductorcurrentbecomesthetargetvaluewhichisdeterminedbythecombinationvalueoftheoutputoftheVFB-AMPandarampcompensationsignal.
Therampcompensationsignalisusedtopreventsub-harmonicoscillationoftheinductorcurrentcontrolloop.
Thehigh-sideMOSFETisturnedonagainatthenextclockcycle.
Byrepeatingtheoperationinthismanner,thecontrollerregulatestheoutputvoltage.
Thesynchronouslow-sideortherectifyingMOSFETisturnedoneachOFFstatetokeeptheconductionlossminimum.
D-CAPMODEWiththeD-CAPmodeoperation,thePWMcomparatorcomparesVREF2withthecombinationvalueoftheCOMPvoltage,VFB-AMPoutput,andtherampcompensationsignal.
Whenthebothsignalsareequalatthepeakofthevoltagesensesignal,thecomparatorprovidestheOFFsignaltothehigh-sideMOSFETdriver.
Becausethecompensationnetworkisimplementedonthepartandtheoutputwaveformitselfisusedastheerrorsignal,externalcircuitissimplified.
Anotheradvantageisitsinherentfasttransientresponse.
Atrade-offisasufficientamountofESRrequiredintheoutputcapacitor.
TheD-CAPmodeissuitableforrelativelylargeroutputripplevoltageapplication.
Theinductorcurrentinformationisusedfortheovercurrentprotectionandlightloadoperation.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback23ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comPWMFREQUENCYCONTROLTheTPS51220A-Q1hasafixedfrequencycontrolschemewith180°phaseshift.
TheswitchingfrequencycanbedeterminedbyanexternalresistorwhichisconnectedbetweenRFpinandGND,andcanbecalculatedusingEquation1.
(1)TPS51220A-Q1canalsosynchronizetomorethan2.
5VamplitudeexternalclockbyapplyingthesignaltotheRFpin.
Thesettimingofchannel1initiatesattheraisingedge(1.
3Vtyp)oftheclockandchannel2initiatesatthefallingedge(1.
1Vtyp).
Therefore,the50%dutysignalmakesbothchannels180°phaseshift.
Whentheexternalclocksynchronizationisselected,thefollowingconditionsarerequired.
RemoveRFresistorAddclocksignalbeforeEN1orEN2turningonTheTPS51220A-Q1doesNOTsupportswitchingfrequencychangeon-the-fly.
(neitherfromtheswitchingfrequencysetbytheRFresistortotheexternalclock,norviceversa)Figure41.
SwitchingFrequencyvsRF180DegreesPhaseShiftandBlankingTimeThetwochannelsoftheSMPSoperate180degreesphaseshift.
ThisschemehelpsinreducingtheinputRMScurrent.
Asaresult,thedeviceprovidesthebenefitsofsavingthenumberandpowerlossoftheinputbulkcapacitors.
Tominimizeinteractionbetweenthetwochannelscausedbyswitchingnoise,blankingtimeisimplemented.
Theloopcomparatoroutputismaskedduringtheblankingtimetoavoidfalseturningoffthechannel.
Therearetwocaseswheretheinter-channelcommunicationcantakeplace:1.
Onechannel'sswitchingnodefallingedgeisclosetoanotherchannel'sswitchingnoderisingedge.
2.
Onechannel'sswitchingnodefallingedgeisclosetoanotherchannel'sswitchingnodefallingedge.
Inbothcases,theTPS51220A-Q1showsjitterinherenttotheblankingtime.
Sincethedeviceisafixedfrequencycontroller,therisingedgeoftheswitchingnodeissettledattheclockcycle.
Consequently,jitterisobservedataperiodofswitchingnodefallingedge.
Thisjitterdoesnotrepresentsmallsignalinstability.
Infact,24SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011jitteringisanormalactionofcontrolloopagainsttimingdeviationcausedbyanyaccidentaleventsuchasnoise,ortheblankingtime,adjustingbacktotheregulationpoint.
Asmallamountofjitteringdoesnotharmthevoltageregulation.
However;iftheuserwantsafurtherreductionofjitter,usingtheexternalclocksynchronizationprovidesadjustablephaseshiftbetweenchannelstoavoidoverlappingofswitchingevents.
SeethePWMFrequencyControlsection.
LIGHTLOADOPERATIONTheTPS51220A-Q1automaticallyreducesswitchingfrequencyatlightloadconditionstomaintainhighefficiencyifAutoSkiporOut-of-AudiomodeisselectedbySKIPSELx.
Thisreductionoffrequencyisachievedbyskippingpulses.
Astheoutputcurrentdecreasesfromheavyloadcondition,theinductorcurrentisalsoreducedandeventuallycomestothepointthatitspeakreachesapredeterminedcurrent,ILL(PEAK),whichindicatestheboundarybetweenheavy-loadandlight-loadconditions.
OncethetopMOSFETisturnedon,theTPS51220A-Q1doesnotallowittobeturnedoffuntilitreachesILL(PEAK).
Thiseventuallycausesanovervoltageconditiontotheoutputandpulseskipping.
Fromthenextpulseafterzero-crossingisdetected,ILL(PEAK)islimitedbytheramp-downsignalILL(PEAK)RAMP,whichstartsfrom25%oftheovercurrentlimitsetting(IOCL(PEAK):(seetheCurrentProtectionsection)toward5%ofIOCL(PEAK)overoneswitchingcycletopreventcausinglargeripple.
ThetransitionloadpointtothelightloadoperationILL(DC)canbecalculatedinEquation2.
(2)wherefSWisthePWMswitchingfrequencywhichisdeterminedbyRFresistorsettingorexternalclock(3)(4)SwitchingfrequencyversusoutputcurrentinthelightloadconditionisafunctionofL,f,VINandVOUT,butitdecreasesalmostproportionallytotheoutputcurrentfromtheILL(DC),asdescribedinEquation2;whilemaintainingtheswitchingsynchronizationwiththeclock.
Duetothesynchronization,theswitchingwaveforminboundaryloadcondition(closetoILL(DC))appearsasasub-harmonicoscillation;however,itistheintendedoperation.
IfSKIPSELxistiedtoGND,theTPS51220A-Q1worksonaconstantfrequencyoffSWregardlessitsloadcurrent.
Figure42.
BoundaryBetweenPulseSkippingandCCMCopyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback25ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comFigure43.
InductorCurrentLimitatPulseSkippingTable2.
SkipModeSelectionSKIPSELxGNDVREF2VREG3VREG5OOASkip(maximum7OOASkip(maximum15skips,forOPERATINGMODEContinuousConductionAutoSkipskips,for<400kHz)equaltoorgreaterthan400kHz)OUTOFAUDIOSKIPOPERATIONOut-Of-Audio(OOA)light-loadmodeisauniquecontrolfeaturethatkeepstheswitchingfrequencyaboveacousticaudiblefrequenciestowardvirtuallynoloadconditionwhilemaintainingstate-of-the-arthighconversionefficiency.
WhenOOAisselected,theswitchingfrequencyiskepthigherthanaudiblefrequencyrangeinanyloadcondition.
TheTPS51220A-Q1automaticallyreducedswitchingfrequencyatlight-loadconditions.
TheOOAcontrolcircuitmonitorsthestatesofbothMOSFETsandforcesanONstateifthepredeterminednumberofpulsesareskipped.
Thehigh-sideMOSFETisturnedonbeforetheoutputvoltagedeclinesdowntothetargetvalue,sothateventuallyanovervoltageconditioniscaused.
TheOOAcontrolcircuitdetectsthisovervoltageconditionandbeginsmodulatingtheskip-modeontimetokeeptheoutputvoltage.
TheTPS51220A-Q1supportsawide-switchingfrequencyrange,therefore,theOOAskipmodehastwoselections.
SeeTable2.
Whenthe300-kHzswitchingfrequencyisselected,amaximumofseven(7)skips(SKIPSEL=3.
3V)makesthelowestfrequencyat37.
5kHz.
Ifa15-skipmaximumischosen,itbecomes18.
8kHz,hencethemaximum7skipissuitableforlessthan400kHz,andthemaximum15skipis400kHzorgreater.
99%DUTYCYCLEOPERATIONInalow-dropoutconditionsuchas5-Vinputto5-Voutput,thebasiccontrolloopattemptstomaintain100%ofthehigh-sideMOSFETON.
However,withtheN-channelMOSFETusedforthetopswitch,itisnotpossibletousethe100%on-cycletochargethebootstrapcapacitor.
Whenhighdutyisrequired,theTPS51220A-Q1extendstheONperiod(byskippingamaximumofthreeclockcyclesandreducingtheswitchingfrequencyto25%ofthesteadystatevalue)andassertstheOFFstateafterextendedON.
26SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011HIGH-SIDEDRIVERThehigh-sidedriverisdesignedtodrivehighcurrent,lowRDS(on)N-channelMOSFET(s).
Thedrivecapabilityisrepresentedbyitsinternalresistance,whichis1.
7forVBSTxtoDRVHx,and1forDRVHxtoSWx.
Whenconfiguredasafloatingdriver,5VofbiasvoltageisdeliveredfromVREG5supply.
TheinstantaneousdrivecurrentissuppliedbytheflyingcapacitorbetweenVBSTxandSWxpins.
TheaveragedrivecurrentisequaltothegatechargeatVgs=5Vtimesswitchingfrequency.
Thisgatedrivecurrentaswellasthelow-sidegatedrivecurrenttimes5VmakesthedrivingpowerwhichneedstobedissipatedmainlyfromTPS51220A-Q1package.
Adeadtimetopreventshootthroughisinternallygeneratedbetweenhigh-sideMOSFETofftolow-sideMOSFETon,andlow-sideMOSFETofftohigh-sideMOSFETon.
LOW-SIDEDRIVERThelow-sidedriverisdesignedtodrivehigh-currentlow-RDS(on)N-channelMOSFET(s).
Thedrivecapabilityisrepresentedbyitsinternalresistance,whichare1.
3forVREG5toDRVLxand0.
7forDRVLxtoGND.
The5-VbiasvoltageisdeliveredfromVREG5supply.
TheinstantaneousdrivecurrentissuppliedbyaninputcapacitorconnectedbetweenVREG5andGND.
TheaveragedrivecurrentisalsocalculatedbythegatechargeatVgs=5Vtimesswitchingfrequency.
CURRENTSENSINGSCHEMEInordertoprovidebothgoodaccuracyandcosteffectivesolution,theTPS51220A-Q1supportsexternalresistorsensingandinductorDCRsensing.
AnRCnetworkwithhighqualityX5RorX7RceramiccapacitorshouldbeusedtoextractvoltagedropacrossDCR.
0.
1μFisagoodvaluetostartthedesign.
CSPxandCSNxshouldbeconnectedtopositiveandnegativeterminalofthesensingdevicerespectively.
TPS51220A-Q1hasaninternalcurrentamplifier.
Thegainofthecurrentamplifier,Gc,isselectedbyTRIPterminal.
Inanysetting,theoutputsignalofthecurrentamplifierbecomes100mVattheOCLsettingpoint.
ThismeansthatthecurrentsensingamplifiernormalizethecurrentinformationsignalbasedontheOCLsetting.
AttachingaRCnetworkrecommendedevenwitharesistorsensingschemetogetanaccuratecurrentsensing;seetheexternalpartsselectionsessionfordetailedconfigurations.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback27ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comADAPTIVEZEROCROSSINGTPS51220A-Q1hasanadaptivezerocrossingcircuitwhichperformsoptimizationofthezeroinductorcurrentdetectionatskipmodeoperation.
Thisfunctionpursuesideallow-sideMOSFETturningofftimingandcompensatesinherentoffsetvoltageoftheZCcomparatoranddelaytimeoftheZCdetectioncircuit.
ItpreventsSW-nodeswing-upcausedbytoolatedetectionandminimizesdiodeconductionperiodcausedbytooearlydetection.
Asaresult,betterlightloadefficiencyisdelivered.
CURRENTPROTECTIONTPS51220A-Q1hascycle-by-cycleovercurrentlimitingcontrol.
Iftheinductorcurrentbecomeslargerthantheovercurrenttriplevel,TPS51220A-Q1turnsoffhigh-sideMOSFET,turnsonlow-sideMOSFETandwaitsforthenextclockcycle.
IOCL(PEAK)setspeakleveloftheinductorcurrent.
Thus,thedcloadcurrentatovercurrentthreshold,IOCL(DC),canbecalculatedasfollows;(5)whereRSENSEisresistanceofcurrentsensingdeviceV(OCL)istheovercurrenttripthresholdvoltagewhichisdeterminedbyTRIPpinvoltagesasshowninTable3(6)Inanovercurrentcondition,thecurrenttotheloadexceedsthecurrenttotheoutputcapacitorthustheoutputvoltagetendstofalldown,anditultimatelycrossestheundervoltageprotectionthresholdandshutdown.
Table3.
OCLTripandDischargeSelectionTRIPGNDVREF2VREG3VREG5V(OCL)(OCLTRIPVOLTAGE)V(OCL-ULV)(ULTRA-LOWVOLTAGE)V(OCL-LV)(LOWVOLTAGE)DISCHARGEEnableDisableDisableEnablePOWERGOODTheTPS51220A-Q1haspowergoodoutputforbothswitcherchannels.
Thepowergoodfunctionisactivatedaftersoftstarthasfinished.
Iftheoutputvoltagebecomeswithin±5%ofthetargetvalue,internalcomparatorsdetectpowergoodstateandthepowergoodsignalbecomeshighafter1msinternaldelay.
Iftheoutputvoltagegoesoutsideof±10%ofthetargetvalue,thepowergoodsignalbecomeslowafter1.
5μsinternaldelay.
Applyvoltageshouldbelessthan6Vandtherecommendedpull-upresistancevalueisfrom100kto1M.
OUTPUTDISCHARGECONTROLTheTPS51220A-Q1dischargesoutputwhenENxislow.
TheTPS51220A-Q1dischargesoutputsusinganinternalMOSFETwhichisconnectedtoCSNxandGND.
ThecurrentcapabilityoftheseMOSFETsislimitedtodischargetheoutputcapacitorslowly.
IfENxbecomeshighduringdischarge,MOSFETsareturningoff,andsomeoutputvoltageremains.
SMPSchangesovertosoft-start.
ThePWMinitiatesafterthetargetvoltageovertakestheremainingoutputvoltage.
ThisfunctioncanbedisabledasshowninTable3.
28SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011OVERVOLTAGE/UNDERVOLTAGEPROTECTIONTPS51220A-Q1monitorstheoutputvoltagetodetectovervoltageandundervoltage.
Whentheoutputvoltagebecomes15%higherthanthetargetvalue,theOVPcomparatoroutputgoeshighandthecircuitlatchesasthehigh-sideMOSFETdriverOFFandthelow-sideMOSFETdriverON,andshutsoffanotherchannel.
Whenthefeedbackvoltagebecomeslowerthan70%ofthetargetvoltage,theUVPcomparatoroutputgoeshighandaninternalUVPdelaycounterbeginscounting.
After1ms,TPS51220A-Q1latchesOFFbothhigh-sideandlow-sideMOSFETs,andshutsoffanotherchannel.
ThisUVPfunctionisenabledaftersoft-starthascompleted.
OVPfunctioncanbedisabledasshowninTable4.
Theproceduresforrestartingfromtheseprotectionstatesare:1.
toggleEN2.
toggleEN1andEN2or3.
oncehitUVLOTable4.
FUNCLogicStatesFUNCGNDVREF2VREG3VREG5OVPEnableDisableEnableDisableCONTROLCurrentmodeD-CAPmodeD-CAPmodeCurrentmodeSCHEMEUVLOPROTECTIONTheTPS51220A-Q1hasundervoltagelockoutprotections(UVLO)forVREG5,VREG3andVREF2.
WhenthevoltageislowerthanUVLOthresholdvoltage,TPS51220A-Q1shutsoffeachoutputasshowninTable5.
Thisisnon-latchprotection.
Table5.
UVLOProtectionCH1/CH2VREG5VREG3VREF2VREG5UVLOOff—OnOnVREG3UVLOOffOff—OffVREF2UVLOOffOffOn—THERMALSHUTDOWNTheTPS51220A-Q1monitorsthedevicetemperature.
Ifthetemperatureexceedsthethresholdvalue,TPS51220A-Q1shutsoffbothSMPSand5V-LDO,anddecreasestheVREG3currentlimitationto5mA(typically).
Thisisnon-latchprotection.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback29ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comAPPLICATIONINFORMATIONEXTERNALPARTSSELECTIONAbuckconverterusingtheTPS51220A-Q1consistsoflinearcircuitsandaswitchingmodulator.
Figure44andFigure45showbasicscheme.
Figure44.
SimplifiedCurrentModeFunctionalBlocksFigure45.
SimplifiedD-CAPModeFunctionalBlocksTheexternalcomponentscanbeselectedbyfollowingmanner.
1.
Determineoutputvoltagedividingresistors.
(R1andR2:showninFigure44)usingEquation7.
(7)ForD-CAPmode,recommendedR2valueisfrom10kto20k.
2.
Determineswitchingfrequency.
Higherfrequencyallowssmalleroutputcapacitances,however,degradeefficiencyduetoincreaseofswitchingloss.
FrequencysettingresistorforRF-pincanbecalculatedby;(8)30SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH20113.
Choosetheinductor.
Theinductancevalueshouldbedeterminedtogivetheripplecurrentofapproximately25%to50%ofmaximumoutputcurrent.
Recommendedripplecurrentrateisabout30%to40%atthetypicalinputvoltagecondition,nextequationuses33%.
(9)TheinductoralsoneedstohavelowDCRtoachievegoodefficiency,aswellasenoughroomabovepeakinductorcurrentbeforesaturation.
4.
DeterminetheOCLtripvoltagethreshold,V(OCL),andselectthesensingresistor.
TheOCLtripvoltagethresholdisdeterminedbyTRIPpinsetting.
TousealargervalueimprovestheS/Nratio.
Determinethesensingresistorusingnextequation.
IOCL(PEAK)shouldbeapproximately1.
5*IOUT(MAX)to1.
7*IOUT(MAX).
(10)5.
DetermineRgv.
RgvshouldbedeterminedfrompreferabledroopcompensationvalueandisgivenbynextequationbasedonthetypicalnumberofGmv=500μS.
(11)(12)Ifno-droopispreferred,attachaseriesRCnetworkcircuitinsteadofsingleresistor.
SeriesresistanceisdeterminedusingEquation12.
SeriescapacitancecanbearbitrarilychosentomeettheRCtimeconstant,butshouldbekeptunder1/10offo.
ForD-CAPmode,Rgvisusedforadjustingrampcompensation.
10kisagoodvaluetostartdesignwith.
6kto20kcanbechosen.
6.
DetermineoutputcapacitanceCotoachieveastableoperationusingthenextequation.
The0dBfrequency,fo,shouldbekeptunder1/3oftheswitchingfrequency.
(13)(14)ForD-CAPmode,foisdeterminedbytheoutputcapacitor'scharacteristicsasbelow.
(15)(16)Forbetterjitterperformance,asufficientamountoffeedbacksignalisrequiredatVFBxpin.
Therecommendedsignallevelisapproximately30mVpertsw(switchingperiod)oftherampinguprate,andmorethan4mVofpeak-to-peakvoltage.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback31ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comFigure46.
Requiredvoltagefeedbackrampsignal7.
CalculateCc.
ThepurposeofthiscapacitanceistocancelzerocausedbyESRoftheoutputcapacitor.
Ifceramiccapacitor(s)isused,thereisnoneedforCc.
Ifacombinationofdifferentcapacitorsisused,attachaRCnetworkcircuitinsteadofsinglecapacitancetocancelzerosandpolescausedbytheoutputcapacitors.
Withsinglecapacitance,CcisgiveninEquation17.
(17)ForD-CAPmode,basicallyCcisnotneeded.
8.
ChooseMOSFETsGenerally,theonresistanceaffectsefficiencyathighloadconditionsasconductionloss.
Foralowoutputvoltageapplication,thedutyratioisnothighenoughsothattheonresistanceofhigh-sideMOSFETdoesnotaffectefficiency;however,switchingspeed(trandtf)affectsefficiencyasswitchingloss.
Asforlow-sideMOSFET,theswitchinglossisusuallynotamainportionofthetotalloss.
RESISTORCURRENTSENSINGFormoreaccuratecurrentsensingwithanexternalresistor,thefollowingtechniqueisrecommended.
AddinganRCfiltertocanceltheparasiticinductanceofresistor,thisfiltervalueiscalculatedusingEquation18.
(18)Thisequationmeanstime-constantofCxandRxshouldmatchtheoneofLx(ESL)andRs.
Figure47.
ExternalResistorCurrentSensing32SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011INDUCTORDCRCURRENTSENSINGTouseinductorDCRascurrentsensingresistor(Rs),theconfigurationneedstochangeasbelow.
However,theequationthatmustbesatisfiedisthesameastheonefortheresistorsensing.
Figure48.
InductorDCRCurrentSensingFigure49.
InductorDCRCurrentSensingWithVoltageDividerTPS51220A-Q1hasfixedV(OCL)point(60mVor31mV).
InordertoadjustforDCR,avoltagedividercanbeconfiguredadescribedinFigure49.
ForRx,RcandCxcanbecalculatedasshownbelow,andovercurrentlimitationvaluecanbecalculatedasfollows:(19)(20)Figure50showsthecompensationtechniqueforthetemperaturedriftsoftheinductorDCRvalue.
Thisschemeassumesthetemperatureriseatthethermistor(RNTC)isdirectlyproportionaltothetemperatureriseattheinductor.
Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback33ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comFigure50.
InductorDCRCurrentSensingWithTemperatureCompensateLAYOUTCONSIDERATIONSCertainpointsmustbeconsideredbeforestartingaPCBlayoutworkusingtheTPS51220A-Q1.
PlacementPlaceRCnetworkforCSP1andCSP2closetothedevicepins.
PlacebypasscapacitorsforVREG5,VREG3andVREF2closetothedevicepins.
Placefrequency-settingresistorclosetothedevicepin.
PlacethecompensationcircuitsforCOMP1andCOMP2closetothedevicepins.
Placethevoltagesettingresistorsclosetothedevicepins,especiallywhenD-CAPmodeischosen.
Routing(sensitiveanalogportion)Useseparatetracesfor;seeFigure51–Outputvoltagesensingfromcurrentsensing(negative-side)–OutputvoltagesensingfromV5SWinput(whenVOUT=5V)–Currentsensing(positive-side)fromswitch-nodeFigure51.
SensingTraceRoutingsUseKelvinsensingtracesfromthesolderpadsofthecurrentsensingdevice(inductororresistor)tocurrent34SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011sensingcomparatorinputs(CSPxandCSNx).
(SeeFigure52)Figure52.
CurrentSensingTracesUsesmallcopperspaceforVFBx.
TheseareshortandnarrowtracestoavoidnoisecouplingConnectVFBresistortracetothepositivenodeoftheoutputcapacitor.
UsesignalGNDforVREF2andVREG3capacitors,RFandVFBresistors,andtheothersensitiveanalogcomponents.
PlacingasignalGNDplane(underneaththeIC,andfullycoveredperipheralcomponents)ontheinternallayerforshieldingpurposeisrecommended.
(SeeFigure53)UseathermallandforPowerPAD.
Fiveormorevias,with0.
33-mm(13-mils)diameterconnectedfromthethermallandtotheinternalGNDplane,shouldbeusedtohelpdissipation.
DoNOTconnecttheGND-pintothisthermallandonthesurfacelayer,underneaththepackage.
Routing(powerportion)Usewider/shortertracesofDRVLforlow-sidegatedriverstoreducestrayinductance.
UsetheparalleltracesofSWandDRVHforhigh-sideMOSFETgatedrive,andkeepthemawayfromDRVL.
ConnectSWtracetosourceterminalofthehigh-sideMOSFET.
UsepowerGNDforVREG5,VINandVOUTcapacitorsandlow-sideMOSFETs.
PowerGNDandsignalGNDshouldbeconnectednearthedeviceGNDterminal.
(SeeFigure53)Figure53.
GNDLayoutExampleCopyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback35ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comAPPLICATIONCIRCUITSFigure54.
CurrentMode,DCRSensing,5-V/8-A,3.
3-V/8-A,330-kHz36SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011Table6.
CurrentMode,DCRSensing,5-V/8-A,3.
3-V/8-A,330-kHzSYMBOLSPECIFICATIONMANUFACTURERPARTNUMBERC112*330μF,6.
3V,18mSanyo6TPE330MILC122*10μF,25VMurataGRM32DR71E106KC21470μF,4.
0V,15mSanyo4TPE470MFLC222*10μF,25VMurataGRM32DR71E106KL13.
3μH,10.
7A,10.
5mTOKOFDV1040-3R3ML23.
3μH,10.
7A,10.
5mTOKOFDV1040-3R3MQ11,Q2130-V,12A,10.
5mFairchildFDMS8692Q12,Q2230V,18A,5.
4mFairchildFDMS8672ASCopyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback37ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comFigure55.
CurrentMode(Non-Droop),DCRSensing,5-V/8-A,3.
3-V/8-A,330-kHz38SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011Table7.
CurrentMode(Non-droop),DCRSensing,5-V/8-A,3.
3-V/8-A,330-kHzSYMBOLSPECIFICATIONMANUFACTURERPARTNUMBERC112x330μF,6.
3V18mSanyo6TPE330MILC122x10μF,25VMurataGRM32DR71E106KC21470μF,4.
0V,15mSanyo4TPE470MFLC222x10μF,25VMurataGRM32DR71E106KL13.
3μH,10.
7A,10.
5mTOKOFDV1040-3R3ML23.
3μH,10.
7A,10.
5mTOKOFDV1040-3R3MQ11,Q2130-V,12-A,10.
5mFairchildFDMS8692Q12,Q2230-V,18-A,5.
4mFairchildFDMS8672ASCopyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback39ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comFigure56.
D-CAPMode,DCRSensing,5-V/8-A,3.
3-V/8-A,330-kHz40SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011Table8.
D-CAPMode,DCRSensing,5-V/8-A,3.
3-V/8-A,330-kHzSYMBOLSPECIFICATIONMANUFACTURERPARTNUMBERC112x330μF,6.
3V,18mSanyo6TPE330MILC122x10μF,25VMurataGRM32DR71E106KC21470μF,4.
0V,15mSanyo4TPE470MFLC222x10μF,25VMurataGRM32DR71E106KL13.
3μH,10.
7A,10.
5mTOKOFDV1040-3R3ML23.
3μH,10.
7A,10.
5mTOKOFDV1040-3R3MQ11,Q2130V,12A,10.
5mFairchildFDMS8692Q12,Q2230V,18A,5.
4mFairchildFDMS8672ASCopyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback41ProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1SLUSAI2–MARCH2011www.
ti.
comFigure57.
CurrentMode,DCRSensing,5-V/5-A,3.
3-V/5-A,300-kHz42SubmitDocumentationFeedbackCopyright2011,TexasInstrumentsIncorporatedProductFolderLink(s):TPS51220A-Q1TPS51220A-Q1www.
ti.
comSLUSAI2–MARCH2011Table9.
CurrentMode,DCRSensing,5-V/5-A,3.
3-V/5-A,300-kHzSYMBOLSPECIFICATIONMANUFACTURERPARTNUMBERC112*120μF,6.
3V,15mPanasonicEEFCX0J121RC122*10μF,25VMurataGRM32DR71E106KC212*220μF,4.
0V,15mPanasonicEEFCX0G221RC222*10μF,25VMurataGRM32DR71E106KL14.
0μH,10.
3A,6.
6mSumidaCEP125-4R0MC-HL24.
0μH,10.
3A,6.
6mSumidaCEP125-4R0MC-HQ11,Q2130V,13.
6A,9.
5mIRIRF7821Q12,Q2230V,13.
8A,5.
8mIRIRF8113Copyright2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback43ProductFolderLink(s):TPS51220A-Q1PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesTPS51220ATRTVRQ1ACTIVEWQFNRTV323000RoHS&GreenNIPDAULevel-3-260C-168HR-40to85TPS51220AT(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.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.
TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page2OTHERQUALIFIEDVERSIONSOFTPS51220A-Q1:Catalog:TPS51220ANOTE:QualifiedVersionDefinitions:Catalog-TI'sstandardcatalogproductTAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantTPS51220ATRTVRQ1WQFNRTV323000330.
012.
45.
35.
31.
58.
012.
0Q2PACKAGEMATERIALSINFORMATIONwww.
ti.
com26-Jan-2013PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)TPS51220ATRTVRQ1WQFNRTV323000367.
0367.
035.
0PACKAGEMATERIALSINFORMATIONwww.
ti.
com26-Jan-2013PackMaterials-Page2www.
ti.
comPACKAGEOUTLINEC32X0.
300.
183.
450.
132X0.
50.
30.
80.
7(DIMA)TYP0.
050.
0028X0.
52X3.
52X3.
5A5.
154.
85B5.
154.
85(0.
2)TYPWQFN-0.
8mmmaxheightRTV0032EPLASTICQUADFLATPACK-NOLEAD4225196/A08/2019SIDEWALLLEADMETALTHICKNESSDIMAOPTION1OPTION20.
10.
2PIN1INDEXAREA0.
08CSEATINGPLANE1817249163225(OPTIONAL)PIN1ID0.
1CAB0.
05CEXPOSEDTHERMALPAD33SYMMSYMMNOTES:1.
Alllineardimensionsareinmillimeters.
Anydimensionsinparenthesisareforreferenceonly.
DimensioningandtolerancingperASMEY14.
5M.
2.
Thisdrawingissubjecttochangewithoutnotice.
3.
Thepackagethermalpadmustbesolderedtotheprintedcircuitboardforthermalandmechanicalperformance.
SCALE3.
000www.
ti.
comEXAMPLEBOARDLAYOUT(1.
475)0.
07MINALLAROUND0.
07MAXALLAROUND32X(0.
24)32X(0.
6)(0.
2)TYPVIA28X(0.
5)(4.
8)(4.
8)(1.
475)(3.
45)(R0.
05)TYPWQFN-0.
8mmmaxheightRTV0032EPLASTICQUADFLATPACK-NOLEAD4225196/A08/2019SYMM1891617242532SYMMLANDPATTERNEXAMPLESCALE:18XNOTES:(continued)4.
Thispackageisdesignedtobesolderedtoathermalpadontheboard.
Formoreinformation,seeTexasInstrumentsliteraturenumberSLUA271(www.
ti.
com/lit/slua271).
5.
Viasareoptionaldependingonapplication,refertodevicedatasheet.
Ifanyviasareimplemented,refertotheirlocationsshownonthisview.
Itisrecommendedthatviasunderpastebefilled,pluggedortented.
33SOLDERMASKOPENINGMETALUNDERSOLDERMASKSOLDERMASKDEFINEDMETALSOLDERMASKOPENINGSOLDERMASKDETAILSNONSOLDERMASKDEFINED(PREFERRED)www.
ti.
comEXAMPLESTENCILDESIGN32X(0.
6)32X(0.
24)28X(0.
5)(4.
8)(4.
8)4X(1.
49)(0.
845)(0.
845)(R0.
05)TYPWQFN-0.
8mmmaxheightRTV0032EPLASTICQUADFLATPACK-NOLEAD4225196/A08/2019NOTES:(continued)6.
Lasercuttingapertureswithtrapezoidalwallsandroundedcornersmayofferbetterpasterelease.
IPC-7525mayhavealternatedesignrecommendations.
33SYMMMETALTYPSOLDERPASTEEXAMPLEBASEDON0.
125mmTHICKSTENCILEXPOSEDPAD33:75%PRINTEDSOLDERCOVERAGEBYAREAUNDERPACKAGESCALE:20XSYMM1891617242532IMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(INCLUDINGDATASHEETS),DESIGNRESOURCES(INCLUDINGREFERENCEDESIGNS),APPLICATIONOROTHERDESIGNADVICE,WEBTOOLS,SAFETYINFORMATION,ANDOTHERRESOURCES"ASIS"ANDWITHALLFAULTS,ANDDISCLAIMSALLWARRANTIES,EXPRESSANDIMPLIED,INCLUDINGWITHOUTLIMITATIONANYIMPLIEDWARRANTIESOFMERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEORNON-INFRINGEMENTOFTHIRDPARTYINTELLECTUALPROPERTYRIGHTS.
TheseresourcesareintendedforskilleddevelopersdesigningwithTIproducts.
Youaresolelyresponsiblefor(1)selectingtheappropriateTIproductsforyourapplication,(2)designing,validatingandtestingyourapplication,and(3)ensuringyourapplicationmeetsapplicablestandards,andanyothersafety,security,orotherrequirements.
Theseresourcesaresubjecttochangewithoutnotice.
TIgrantsyoupermissiontousetheseresourcesonlyfordevelopmentofanapplicationthatusestheTIproductsdescribedintheresource.
Otherreproductionanddisplayoftheseresourcesisprohibited.
NolicenseisgrantedtoanyotherTIintellectualpropertyrightortoanythirdpartyintellectualpropertyright.
TIdisclaimsresponsibilityfor,andyouwillfullyindemnifyTIanditsrepresentativesagainst,anyclaims,damages,costs,losses,andliabilitiesarisingoutofyouruseoftheseresources.
TI'sproductsareprovidedsubjecttoTI'sTermsofSale(www.
ti.
com/legal/termsofsale.
html)orotherapplicabletermsavailableeitheronti.
comorprovidedinconjunctionwithsuchTIproducts.
TI'sprovisionoftheseresourcesdoesnotexpandorotherwisealterTI'sapplicablewarrantiesorwarrantydisclaimersforTIproducts.
MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated