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FN6474Rev1.
00Page1of11February22,2008FN6474Rev1.
00February22,2008ISL97701BoostRegulatorwithIntegratedSchottkyandInputDisconnectSwitchDATASHEETTheISL97701representsahighefficiencyboostconverterwithintegratedboostFET,boostdiodeandinputdisconnectFET.
Withaninputvoltageof2.
3Vto5.
5VtheISL97701hasanoutputcapabilityofupto50mAat18Vusingintegrated500mAswitches.
Efficienciesareupto87%.
TheintegratedprotectionFETisusedtodisconnecttheboostinductorfromtheinputsupplywheneveranoutputfaultconditionisdetected,orwhenthedeviceisdisabled.
Thisgives0outputcurrentinthedisabledmode,comparedtostandardboostconverterswherecurrentcanstillflowwhenthedeviceisdisabled.
TheISL97701comesinthe10Ld3x3DFNpackageandisspecifiedforoperationoverthe-40°Cto+85°Ctemperaturerange.
PinoutISL97701(10LD3X3DFN)TOPVIEWFeaturesUpto87%efficiency2.
3Vto5.
5VinputUpto28Voutput50mAat18VIntegratedboostSchottkydiodeInputvoltagedisconnectswitchSynchronizationinputChipenable10Ld3x3DFNpackagePb-free(RoHScompliant)ApplicationsOLEDdisplaypowerLEDdisplaypowerAdjustablepowersuppliesTypicalApplicationDiagramOrderingInformationPARTNUMBER(Note)PARTMARKINGPACKAGE(Pb-free)PKG.
DWG.
#ISL97701IRZ97701IRZ10Ld3x3DFNMDP0047ISL97701IRZ-T7*97701IRZ10Ld3x3DFNMDP0047ISL97701IRZ-T13*97701IRZ10Ld3x3DFNMDP0047*PleaserefertoTB347fordetailsonreelspecifications.
NOTE:TheseIntersilPb-freeplasticpackagedproductsemployspecialPb-freematerialsets;moldingcompounds/dieattachmaterialsand100%mattetinplatePLUSANNEAL-e3terminationfinish,whichisRoHScompliantandcompatiblewithbothSnPbandPb-freesolderingoperations.
IntersilPb-freeproductsareMSLclassifiedatPb-freepeakreflowtemperaturesthatmeetorexceedthePb-freerequirementsofIPC/JEDECJSTD-020.
12341098756THERMALPADGNDVDDOUTVDDNSYNCLXVOUTNENGNDNCFBOSCILLATORANDCONTROLVDDOUTNENNSYNCGNDC05FC13.
3FR1390kR239kL16.
8HLXVOUTFBVDD+2VTO30VNOTE:VOUT=(390k+39k)/39k*1.
15V=12.
65VVDD2.
3VTO5.
5VISL97701FN6474Rev1.
00Page2of11February22,2008BlockDiagramSTATEMACHINE(DEFAULTSEQUENCE)1.
SOFTINRUSH2.
VDDOUTENABLE3.
SOFTBOOST254.
SOFTBOOST505.
SOFTBOOST756.
NORMALNSYNCNENFBVDDSYNCHRONIZATIONSIGNALDETECTOROSCILLATOROVER-TEMPERATUREDETECTORMUXUNDERVOLTAGEDETECTOROVERCURRENTDETECTOR(DC)OVER-VOLTAGEDETECTORVDDVDDOUTVOUTLXGNDVOLTAGEREFERENCEERRORAMPCCOMPCLAMPSLOPECOMPENSATIONRAMP-GENERATORCONTROLLOGIC-PWMTIMING-CURRENTLIMIT-PULSESKIPPINGENCURRENTLIMITCOMPARATORGATEDRIVER+-+As-+-Av+-AiSTARTCLKRESTARTDISABLEANDWAITRSENSES2210VDDISL97701FIGURE1.
ISL97701BLOCKDIAGRAMGNDISL97701FN6474Rev1.
00Page3of11February22,2008AbsoluteMaximumRatings(TA=+25°C)ThermalInformationVDDtoGND0.
3Vto6VVOUTtoGND.
0.
3Vto31VLXtoGNDVOUT+1VVDDOUT,NSYNC,FB,NENtoGND0.
3VtoVDD+0.
3VContinuousCurrentinVDD,GND,VDDOUT,LX650mAContinuousCurrentinNSYNC,FB,NEN10mAThermalResistance(Typical,Notes1,2)JA(°C/W)JC(°C/W)10Ld3x3DFNPackage487StorageTemperature65°Cto+150°CAmbientOperatingTemperature(TA)40°Cto+85°COperatingJunctionTemperature(TJ)125°CMaximumJunctionTemperature130°CPb-freereflowprofileseelinkbelowhttp://www.
intersil.
com/pbfree/Pb-FreeReflow.
aspCAUTION:Donotoperateatornearthemaximumratingslistedforextendedperiodsoftime.
Exposuretosuchconditionsmayadverselyimpactproductreliabilityandresultinfailuresnotcoveredbywarranty.
NOTES:1.
JAismeasuredinfreeairwiththecomponentmountedonahigheffectivethermalconductivitytestboardwith"directattach"features.
SeeTechBriefTB379.
2.
ForJC,the"casetemp"locationisthecenteroftheexposedmetalpadonthepackageunderside.
ElectricalSpecificationsVDD=3.
6V,GND=NEN=0V,NSYNC=VDD,R1=390k,R2=39k,L=10H,TA=-40°Cto+85°Cunlessotherwisestated.
PARAMETERDESCRIPTIONCONDITIONMINTYPMAXUNITSUPPLYVDDSupplyOperatingVoltageRange2.
35.
5VIDISSupplyCurrentwhenDisabledNEN=VDD0.
13ALOGICINPUTS–NEN,NSYNCRUPPull-upResistorEnabled,InputatGND150250350kIILLeakageCurrentwhenDisabledDisabled,InputatGND-11AVHILogicHighThreshold1.
8VVLOLogicLowThreshold0.
7VPOWER-ONRESET–VDDVRES_ONPower-OnResetThresholdVDDrising2.
22.
3VVRES_OFFPower-OffThresholdVDDfalling1.
92VLXOUTPUTDRIVERfOSCLXSwitchingFrequencywithInternalOscillator0.
911.
1MHzfSYNCLXSwitchingFrequencywhenExternallySynchronizedatNSYNCf(NSYNC)tON-MINMinimumOn-TimeFB=0V,I(LX)>Ilim(LX)60nstOFF-MINMinimumOff-time(MaximumDutyCycle)FB=0V,I(LX)8.
32ms(endofsoft-start)1200mASCHOTTKYDIODE–LX,VOUTVDIODEForwardVoltagefromLXtoVOUTI=10mA,TA=+25°C0.
40.
50.
6VI=10mA,TA=-40°Cto+85°C0.
30.
50.
7VISL97701FN6474Rev1.
00Page4of11February22,2008FEEDBACKINPUTSVrefFBInputReferenceVoltageonFBTA=+25°C1.
131.
151.
17VTA=-40°Cto+85°C1.
121.
151.
18VIFBInputCurrentinFBFB=1.
3V-0.
20.
2ARFBFBPull-DownSwitchResistanceIFB=10mA1525SYNCHRONIZATIONINPUT–NSYNCfNSYNCExternalSyncFrequencyRange6001400kHztdNSYNCNSYNCFallingEdgetoLXFallingEdgeDelayfNSYNC=600kHz80100nsOVERVOLTAGEDETECTOR-VOUTVOUTOvervoltageThresholdFB=GND3135VOVERCURRENTDETECTORIOCTVDDOUTOvercurrentThresholdt>2.
048ms,DCcurrent800mAOVER-TEMPERATUREDETECTORtOFFShut-DownTemperatureThresholdTrising135°CtONTurn-OnTemperatureThresholdTfalling100°CFAULTSWITCH–VDD,VDDOUTrONFSON-ResistancefromVDDtoVDDOUTIOUT=50mA,t>2.
048ms0.
2IleakVDDOUTLeakageCurrentVDDOUT=0V0.
013AISS_VDDOUTSoftInrushCurrentSourceatVDDOUTVDD-VDDOUT=0.
5V,tONVDDOUTEnable->SoftBoost25->SoftBoost50->SoftBoost75->Normal.
Ifthesequencehascompleted,theISL97701staysinthe"Normal"stateuntilNENishighagainoranyfaultisdetected.
SOFTINRUSH:STATEDURATION~2.
048msTheswitchatVDDOUTisconfiguredascurrentsourceandprovidesalimitedcurrentthroughtheinductortopre-chargethecapacitoratVOUT.
VDDOUTENABLE:STATEDURATION~128ΜsTheswitchatVDDOUTisfullyenabledandconnectstheinductortoVDDwithalowON-resistance.
SOFTBOOST25->50->75:STATEDURATION3x~2.
048msTheboostregulatorbeginstoswitchatLX.
TheLXcurrentlimitincreasesinthreestepsrepresenting25%,50%and75%ofitsfinalvalue.
NORMALIfnofaultwasdetectedNormalstateisentered~8.
256msafterNENispulledlow.
TheLXcurrentlimitstepsupto100%.
InallstatesFaultControlcanforcethesequencetorestartoreventoshutdown(seeTable1).
FaultControlTheinputvoltageatVDD,currentintheVDDOUTswitch,voltageatVOUTandjunctiontemperatureTJarecontinuouslymonitoredandcaneitherrestartthestart-upsequenceorinPinDescriptionsPINNUMBERPINNAMEPINFUNCTION1GNDGround2VDDOUTProtectionSwitchOutput3VDDSupplyInput4NSYNCSynchronizationInput(FallingEdge)5FBFeedbackInput6NCDoNotConnect7GNDGround8NENEnableInput(ActiveLow)9VOUTBoostOutputVoltage10LXBoostFETVOUTVrefFBR1R2+R2=(EQ.
1)V(NEN)V(VOUT)I(VDD)VDDOUTENABLESOFTINRUSH755025NORMALFIGURE14.
FAULTCONTROLSEQUENCEISL97701FN6474Rev1.
00Page8of11February22,2008somecasesdisabletheISL97701boostfunctionaslongasthefaultispresent.
MaximumDutyCycle–LXThemaximumdutycycleDmax,atwhichthepowerFETcanoperatedefinestheupperlimitoftheregulatoroutputtoinputvoltageratioaccordingtoEquation2:IntheISL97701,DMAXisdefinedfromtheminimumoff-timetOFF(LX)minandtheswitchingfrequency.
IfNSYNCistiedtoVDDtheinternaloscillatordefinesDMAXaccordingtoEquation3:WithexternalsynchronizationatpinNSYNC:ThedutycycleatLXcanbe0%(pulseskipping),iftheoutputvoltageexceedsthetargetvoltagesetwiththefeedbackresistors.
InternalSchottkyDiode–LX,VOUTTheinductornodeLXinternallyconnectstothepowerFETandtotheanodeoftheintegratedpowerSchottkydiode.
ThecathodeofthediodeispinVOUT.
AnovervoltagedetectoratVOUTcontinuouslymonitorsthecathodevoltageandimmediatelydisablestheboostregulatorifthevoltageexceedsthemaximumallowablevoltage.
ExternalSynchronizationPin-NSYNCPinNSYNCcanbeusedtosynchronizetheLXoutputpinwithanexternalclocksignalintherangefrom600kHzto1.
4MHz.
AfrequencydetectormonitoringNSYNCenablesexternalsynchronizationiff(NSYNC)ishigherthan~300kHz.
Ifthepinis,forexample,statichigh,theinternaloscillatordefinestheLXoutputfrequencyandphase.
Whenexternallysynchronized,allfallingedgesatLXaretimedfromthefallingedgeoftheclocksignalappliedatNSYNC.
ThetimingoftherisingedgeatLXisdefinedbytheboostcontroller.
TABLE1.
FAULTPROTECTIONFAULTDESCRIPTIONFAULTCONDITIONISL97701FAULTREACTIONUndervoltageatVDDV(VDD)It(VDDOUT)errDisablesVDDOUTswitchandLXdriverandimmediatelyrestartsthestart-upsequenceOvervoltageatVOUTV(VOUT)>Vt(VOUT)errDisablesVDDOUTswitchandLXdriverandwaitsuntiloutputvoltageV(VOUT)dropstoVt(VOUT)torestartthestart-upsequenceOver-TemperatureonchipTj>ToffDisablesVDDOUTswitchandLXdriverandwaitsuntiljunctiontempdropsto"Ton"torestartthestart-upsequenceVOUTVIN-11DMAX–-=(EQ.
2)DMAXfOSC1tOFFLXminfOSC–=(EQ.
3)DMAXNSYNC1tOFFLXminfNSYNC–=(EQ.
4)V(NSYNC)V(LX)FIGURE15.
NSYNCTOLXSYNCHRONIZATIONDELAYV(NSYNC)V(LX)FIGURE16.
LXSYNCHRONIZATIONWITHf(SYNC)=600kHzFIGURE17.
LXSYNCHRONIZATIONWITHf(SYNC)=1.
4MHzV(NSYNC)V(LX)ISL97701FN6474Rev1.
00Page9of11February22,2008TypicalApplicationTypicalapplicationsarepassive-oractive-matrixorganiclightemittingdiodedisplays(PMOLED,AMOLED)inhandhelddevices.
Applicationswithlowpowerorscreensavermodeisdirectlysupported.
ComponentsSelectionTheinputcapacitanceisnormally10f~15Fandtheoutputcapacitoris3.
3fto6.
6F.
X5RorX7Rtypeofceramiccapacitorwithcorrectvoltageratingisrecommended.
Theoutputcapacitorvaluewillaffecttheoutputvoltageripple.
Thehigherthevalueoftheoutputcapacitor,thelowertherippleoftheoutputvoltage.
Whenchoosinganinductor,makesuretheinductorcanhandletheaverageandpeakcurrentsgivenbyEquations5,6and7(80%efficiencyassumed):Where:IListhepeak-to-peakinductorcurrentrippleinAmperesListheinductanceinHfOSCistheswitchingfrequency,typically1.
0MHzOptimalcombinationsoftheboostinductorLandtheoutputcapacitorCOUTarelistedinTable2:RecommendedinductorandceramiccapacitormanufacturersarelistedinTable3:PCBLayoutConsiderationsThelayoutisveryimportantfortheconvertertofunctionproperly.
Toensurethehighpulsecurrentinthepowergrounddoesnotinterferewiththesensitivefeedbacksignals,thecurrentloops(VIN-L1-LX-GND,andVIN-L1-VOUT-COUT-GND)shouldbeasshortaspossible.
FortheDFNpackage,thereisnoseparatedGND.
AllreturnGNDsshouldbeconnectedinGNDpinbutwithnosharingbranch.
TheheatoftheICismainlydissipatedthroughthethermalpad.
Maximizingthecopperareaconnectedtothethermalpadispreferable.
Inaddition,asolidgroundplaneishelpfulfortheEMIperformance.
FIGURE18.
ISL97701APPLICATIONBOARDGND1VDDOUT2VDD3NSYNC4FB5NC6GND7NEN8VOUT9LX10U1L16.
8HC1100nFC210FJ1VDD_INJ2GND_INJ3GND_OUTJ4NSYNCJ6J7VOUTR1390kR3OPENR639kC8100nF132J1VDDVDDJP3VDDC61nF/50VC73.
3F/50VC94.
7F/10VISL97701NENILAVGIOUTVOUT0.
8VIN-=(EQ.
5)ILPKILAVG12---+IL=(EQ.
6)ILVINVOUTVIN–LVOUTfOSC-=(EQ.
7)TABLE2.
OPTIMALCOMBINATIONOFBOOSTINDUCTORLANDOUTPUTCAPACITORCOUTINDUCTOR(H)CAPACITOR(F)MINMAX4.
72.
2106.
83.
310104.
710156.
810TABLE3.
RECOMMENDEDINDUCTORANDCERAMICCAPACITORMANUFACTURERSINDUCTORCERAMICCAPACITORSumida:www.
sumida.
comTaiyoYuden:www.
t-yuden.
comTDK:www.
tdk.
co.
jpAVX:www.
avxcorp.
comToko:www.
tokoam.
comMurata:www.
murata.
comFN6474Rev1.
00Page10of11February22,2008ISL97701Intersilproductsaremanufactured,assembledandtestedutilizingISO9001qualitysystemsasnotedinthequalitycertificationsfoundatwww.
intersil.
com/en/support/qualandreliability.
htmlIntersilproductsaresoldbydescriptiononly.
Intersilmaymodifythecircuitdesignand/orspecificationsofproductsatanytimewithoutnotice,providedthatsuchmodificationdoesnot,inIntersil'ssolejudgment,affecttheform,fitorfunctionoftheproduct.
Accordingly,thereaderiscautionedtoverifythatdatasheetsarecurrentbeforeplacingorders.
InformationfurnishedbyIntersilisbelievedtobeaccurateandreliable.
However,noresponsibilityisassumedbyIntersiloritssubsidiariesforitsuse;norforanyinfringementsofpatentsorotherrightsofthirdpartieswhichmayresultfromitsuse.
NolicenseisgrantedbyimplicationorotherwiseunderanypatentorpatentrightsofIntersiloritssubsidiaries.
ForinformationregardingIntersilCorporationanditsproducts,seewww.
intersil.
comForadditionalproducts,seewww.
intersil.
com/en/products.
htmlCopyrightIntersilAmericasLLC2007-2008.
AllRightsReserved.
Alltrademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
ISL97701FN6474Rev1.
00Page11of11February22,2008DualFlatNo-LeadPackageFamily(DFN)2X0.
075Cb0.
10CABMDDETAILXPLANESEATING(NLEADSSEEDETAIL"X"1&EXPOSEDPAD)PIN#1I.
D.
PIN#1I.
D.
0.
10(NLEADS)(D2)(E2)BOTTOMVIEWTOPVIEWL1A1(c)2NN-1NN-112AE2X0.
075CBeL534C0.
08CACC2MDP0047DUALFLATNO-LEADPACKAGEFAMILY(JEDECREG:MO-229)SYMBOLMILLIMETERSTOLERANCEDFN8DFN10A0.
850.
90±0.
10A10.
020.
02+0.
03/-0.
02b0.
300.
25±0.
05c0.
200.
20ReferenceD4.
003.
00BasicD23.
002.
25ReferenceE4.
003.
00BasicE22.
201.
50Referencee0.
800.
50BasicL0.
500.
50±0.
10L10.
100MaximumRev.
22/07NOTES:1.
DimensioningandtolerancingperASMEY14.
5M-1994.
2.
Exposedleadatsideofpackageisanon-functionalfeature.
3.
Bottom-sidepin#1I.
D.
maybeadiepadchamfer,anextendedtiebartab,orasmallsquareasshown.
4.
Exposedleadsmayextendtotheedgeofthepackageorbepulledback.
Seedimension"L1".
5.
Inwardendofleadmaybesquareorcircularinshapewithradius(b/2)asshown.
6.
Nisthetotalnumberofleadsonthedevice.
00Page1of11February22,2008FN6474Rev1.
00February22,2008ISL97701BoostRegulatorwithIntegratedSchottkyandInputDisconnectSwitchDATASHEETTheISL97701representsahighefficiencyboostconverterwithintegratedboostFET,boostdiodeandinputdisconnectFET.
Withaninputvoltageof2.
3Vto5.
5VtheISL97701hasanoutputcapabilityofupto50mAat18Vusingintegrated500mAswitches.
Efficienciesareupto87%.
TheintegratedprotectionFETisusedtodisconnecttheboostinductorfromtheinputsupplywheneveranoutputfaultconditionisdetected,orwhenthedeviceisdisabled.
Thisgives0outputcurrentinthedisabledmode,comparedtostandardboostconverterswherecurrentcanstillflowwhenthedeviceisdisabled.
TheISL97701comesinthe10Ld3x3DFNpackageandisspecifiedforoperationoverthe-40°Cto+85°Ctemperaturerange.
PinoutISL97701(10LD3X3DFN)TOPVIEWFeaturesUpto87%efficiency2.
3Vto5.
5VinputUpto28Voutput50mAat18VIntegratedboostSchottkydiodeInputvoltagedisconnectswitchSynchronizationinputChipenable10Ld3x3DFNpackagePb-free(RoHScompliant)ApplicationsOLEDdisplaypowerLEDdisplaypowerAdjustablepowersuppliesTypicalApplicationDiagramOrderingInformationPARTNUMBER(Note)PARTMARKINGPACKAGE(Pb-free)PKG.
DWG.
#ISL97701IRZ97701IRZ10Ld3x3DFNMDP0047ISL97701IRZ-T7*97701IRZ10Ld3x3DFNMDP0047ISL97701IRZ-T13*97701IRZ10Ld3x3DFNMDP0047*PleaserefertoTB347fordetailsonreelspecifications.
NOTE:TheseIntersilPb-freeplasticpackagedproductsemployspecialPb-freematerialsets;moldingcompounds/dieattachmaterialsand100%mattetinplatePLUSANNEAL-e3terminationfinish,whichisRoHScompliantandcompatiblewithbothSnPbandPb-freesolderingoperations.
IntersilPb-freeproductsareMSLclassifiedatPb-freepeakreflowtemperaturesthatmeetorexceedthePb-freerequirementsofIPC/JEDECJSTD-020.
12341098756THERMALPADGNDVDDOUTVDDNSYNCLXVOUTNENGNDNCFBOSCILLATORANDCONTROLVDDOUTNENNSYNCGNDC05FC13.
3FR1390kR239kL16.
8HLXVOUTFBVDD+2VTO30VNOTE:VOUT=(390k+39k)/39k*1.
15V=12.
65VVDD2.
3VTO5.
5VISL97701FN6474Rev1.
00Page2of11February22,2008BlockDiagramSTATEMACHINE(DEFAULTSEQUENCE)1.
SOFTINRUSH2.
VDDOUTENABLE3.
SOFTBOOST254.
SOFTBOOST505.
SOFTBOOST756.
NORMALNSYNCNENFBVDDSYNCHRONIZATIONSIGNALDETECTOROSCILLATOROVER-TEMPERATUREDETECTORMUXUNDERVOLTAGEDETECTOROVERCURRENTDETECTOR(DC)OVER-VOLTAGEDETECTORVDDVDDOUTVOUTLXGNDVOLTAGEREFERENCEERRORAMPCCOMPCLAMPSLOPECOMPENSATIONRAMP-GENERATORCONTROLLOGIC-PWMTIMING-CURRENTLIMIT-PULSESKIPPINGENCURRENTLIMITCOMPARATORGATEDRIVER+-+As-+-Av+-AiSTARTCLKRESTARTDISABLEANDWAITRSENSES2210VDDISL97701FIGURE1.
ISL97701BLOCKDIAGRAMGNDISL97701FN6474Rev1.
00Page3of11February22,2008AbsoluteMaximumRatings(TA=+25°C)ThermalInformationVDDtoGND0.
3Vto6VVOUTtoGND.
0.
3Vto31VLXtoGNDVOUT+1VVDDOUT,NSYNC,FB,NENtoGND0.
3VtoVDD+0.
3VContinuousCurrentinVDD,GND,VDDOUT,LX650mAContinuousCurrentinNSYNC,FB,NEN10mAThermalResistance(Typical,Notes1,2)JA(°C/W)JC(°C/W)10Ld3x3DFNPackage487StorageTemperature65°Cto+150°CAmbientOperatingTemperature(TA)40°Cto+85°COperatingJunctionTemperature(TJ)125°CMaximumJunctionTemperature130°CPb-freereflowprofileseelinkbelowhttp://www.
intersil.
com/pbfree/Pb-FreeReflow.
aspCAUTION:Donotoperateatornearthemaximumratingslistedforextendedperiodsoftime.
Exposuretosuchconditionsmayadverselyimpactproductreliabilityandresultinfailuresnotcoveredbywarranty.
NOTES:1.
JAismeasuredinfreeairwiththecomponentmountedonahigheffectivethermalconductivitytestboardwith"directattach"features.
SeeTechBriefTB379.
2.
ForJC,the"casetemp"locationisthecenteroftheexposedmetalpadonthepackageunderside.
ElectricalSpecificationsVDD=3.
6V,GND=NEN=0V,NSYNC=VDD,R1=390k,R2=39k,L=10H,TA=-40°Cto+85°Cunlessotherwisestated.
PARAMETERDESCRIPTIONCONDITIONMINTYPMAXUNITSUPPLYVDDSupplyOperatingVoltageRange2.
35.
5VIDISSupplyCurrentwhenDisabledNEN=VDD0.
13ALOGICINPUTS–NEN,NSYNCRUPPull-upResistorEnabled,InputatGND150250350kIILLeakageCurrentwhenDisabledDisabled,InputatGND-11AVHILogicHighThreshold1.
8VVLOLogicLowThreshold0.
7VPOWER-ONRESET–VDDVRES_ONPower-OnResetThresholdVDDrising2.
22.
3VVRES_OFFPower-OffThresholdVDDfalling1.
92VLXOUTPUTDRIVERfOSCLXSwitchingFrequencywithInternalOscillator0.
911.
1MHzfSYNCLXSwitchingFrequencywhenExternallySynchronizedatNSYNCf(NSYNC)tON-MINMinimumOn-TimeFB=0V,I(LX)>Ilim(LX)60nstOFF-MINMinimumOff-time(MaximumDutyCycle)FB=0V,I(LX)8.
32ms(endofsoft-start)1200mASCHOTTKYDIODE–LX,VOUTVDIODEForwardVoltagefromLXtoVOUTI=10mA,TA=+25°C0.
40.
50.
6VI=10mA,TA=-40°Cto+85°C0.
30.
50.
7VISL97701FN6474Rev1.
00Page4of11February22,2008FEEDBACKINPUTSVrefFBInputReferenceVoltageonFBTA=+25°C1.
131.
151.
17VTA=-40°Cto+85°C1.
121.
151.
18VIFBInputCurrentinFBFB=1.
3V-0.
20.
2ARFBFBPull-DownSwitchResistanceIFB=10mA1525SYNCHRONIZATIONINPUT–NSYNCfNSYNCExternalSyncFrequencyRange6001400kHztdNSYNCNSYNCFallingEdgetoLXFallingEdgeDelayfNSYNC=600kHz80100nsOVERVOLTAGEDETECTOR-VOUTVOUTOvervoltageThresholdFB=GND3135VOVERCURRENTDETECTORIOCTVDDOUTOvercurrentThresholdt>2.
048ms,DCcurrent800mAOVER-TEMPERATUREDETECTORtOFFShut-DownTemperatureThresholdTrising135°CtONTurn-OnTemperatureThresholdTfalling100°CFAULTSWITCH–VDD,VDDOUTrONFSON-ResistancefromVDDtoVDDOUTIOUT=50mA,t>2.
048ms0.
2IleakVDDOUTLeakageCurrentVDDOUT=0V0.
013AISS_VDDOUTSoftInrushCurrentSourceatVDDOUTVDD-VDDOUT=0.
5V,tONVDDOUTEnable->SoftBoost25->SoftBoost50->SoftBoost75->Normal.
Ifthesequencehascompleted,theISL97701staysinthe"Normal"stateuntilNENishighagainoranyfaultisdetected.
SOFTINRUSH:STATEDURATION~2.
048msTheswitchatVDDOUTisconfiguredascurrentsourceandprovidesalimitedcurrentthroughtheinductortopre-chargethecapacitoratVOUT.
VDDOUTENABLE:STATEDURATION~128ΜsTheswitchatVDDOUTisfullyenabledandconnectstheinductortoVDDwithalowON-resistance.
SOFTBOOST25->50->75:STATEDURATION3x~2.
048msTheboostregulatorbeginstoswitchatLX.
TheLXcurrentlimitincreasesinthreestepsrepresenting25%,50%and75%ofitsfinalvalue.
NORMALIfnofaultwasdetectedNormalstateisentered~8.
256msafterNENispulledlow.
TheLXcurrentlimitstepsupto100%.
InallstatesFaultControlcanforcethesequencetorestartoreventoshutdown(seeTable1).
FaultControlTheinputvoltageatVDD,currentintheVDDOUTswitch,voltageatVOUTandjunctiontemperatureTJarecontinuouslymonitoredandcaneitherrestartthestart-upsequenceorinPinDescriptionsPINNUMBERPINNAMEPINFUNCTION1GNDGround2VDDOUTProtectionSwitchOutput3VDDSupplyInput4NSYNCSynchronizationInput(FallingEdge)5FBFeedbackInput6NCDoNotConnect7GNDGround8NENEnableInput(ActiveLow)9VOUTBoostOutputVoltage10LXBoostFETVOUTVrefFBR1R2+R2=(EQ.
1)V(NEN)V(VOUT)I(VDD)VDDOUTENABLESOFTINRUSH755025NORMALFIGURE14.
FAULTCONTROLSEQUENCEISL97701FN6474Rev1.
00Page8of11February22,2008somecasesdisabletheISL97701boostfunctionaslongasthefaultispresent.
MaximumDutyCycle–LXThemaximumdutycycleDmax,atwhichthepowerFETcanoperatedefinestheupperlimitoftheregulatoroutputtoinputvoltageratioaccordingtoEquation2:IntheISL97701,DMAXisdefinedfromtheminimumoff-timetOFF(LX)minandtheswitchingfrequency.
IfNSYNCistiedtoVDDtheinternaloscillatordefinesDMAXaccordingtoEquation3:WithexternalsynchronizationatpinNSYNC:ThedutycycleatLXcanbe0%(pulseskipping),iftheoutputvoltageexceedsthetargetvoltagesetwiththefeedbackresistors.
InternalSchottkyDiode–LX,VOUTTheinductornodeLXinternallyconnectstothepowerFETandtotheanodeoftheintegratedpowerSchottkydiode.
ThecathodeofthediodeispinVOUT.
AnovervoltagedetectoratVOUTcontinuouslymonitorsthecathodevoltageandimmediatelydisablestheboostregulatorifthevoltageexceedsthemaximumallowablevoltage.
ExternalSynchronizationPin-NSYNCPinNSYNCcanbeusedtosynchronizetheLXoutputpinwithanexternalclocksignalintherangefrom600kHzto1.
4MHz.
AfrequencydetectormonitoringNSYNCenablesexternalsynchronizationiff(NSYNC)ishigherthan~300kHz.
Ifthepinis,forexample,statichigh,theinternaloscillatordefinestheLXoutputfrequencyandphase.
Whenexternallysynchronized,allfallingedgesatLXaretimedfromthefallingedgeoftheclocksignalappliedatNSYNC.
ThetimingoftherisingedgeatLXisdefinedbytheboostcontroller.
TABLE1.
FAULTPROTECTIONFAULTDESCRIPTIONFAULTCONDITIONISL97701FAULTREACTIONUndervoltageatVDDV(VDD)It(VDDOUT)errDisablesVDDOUTswitchandLXdriverandimmediatelyrestartsthestart-upsequenceOvervoltageatVOUTV(VOUT)>Vt(VOUT)errDisablesVDDOUTswitchandLXdriverandwaitsuntiloutputvoltageV(VOUT)dropstoVt(VOUT)torestartthestart-upsequenceOver-TemperatureonchipTj>ToffDisablesVDDOUTswitchandLXdriverandwaitsuntiljunctiontempdropsto"Ton"torestartthestart-upsequenceVOUTVIN-11DMAX–-=(EQ.
2)DMAXfOSC1tOFFLXminfOSC–=(EQ.
3)DMAXNSYNC1tOFFLXminfNSYNC–=(EQ.
4)V(NSYNC)V(LX)FIGURE15.
NSYNCTOLXSYNCHRONIZATIONDELAYV(NSYNC)V(LX)FIGURE16.
LXSYNCHRONIZATIONWITHf(SYNC)=600kHzFIGURE17.
LXSYNCHRONIZATIONWITHf(SYNC)=1.
4MHzV(NSYNC)V(LX)ISL97701FN6474Rev1.
00Page9of11February22,2008TypicalApplicationTypicalapplicationsarepassive-oractive-matrixorganiclightemittingdiodedisplays(PMOLED,AMOLED)inhandhelddevices.
Applicationswithlowpowerorscreensavermodeisdirectlysupported.
ComponentsSelectionTheinputcapacitanceisnormally10f~15Fandtheoutputcapacitoris3.
3fto6.
6F.
X5RorX7Rtypeofceramiccapacitorwithcorrectvoltageratingisrecommended.
Theoutputcapacitorvaluewillaffecttheoutputvoltageripple.
Thehigherthevalueoftheoutputcapacitor,thelowertherippleoftheoutputvoltage.
Whenchoosinganinductor,makesuretheinductorcanhandletheaverageandpeakcurrentsgivenbyEquations5,6and7(80%efficiencyassumed):Where:IListhepeak-to-peakinductorcurrentrippleinAmperesListheinductanceinHfOSCistheswitchingfrequency,typically1.
0MHzOptimalcombinationsoftheboostinductorLandtheoutputcapacitorCOUTarelistedinTable2:RecommendedinductorandceramiccapacitormanufacturersarelistedinTable3:PCBLayoutConsiderationsThelayoutisveryimportantfortheconvertertofunctionproperly.
Toensurethehighpulsecurrentinthepowergrounddoesnotinterferewiththesensitivefeedbacksignals,thecurrentloops(VIN-L1-LX-GND,andVIN-L1-VOUT-COUT-GND)shouldbeasshortaspossible.
FortheDFNpackage,thereisnoseparatedGND.
AllreturnGNDsshouldbeconnectedinGNDpinbutwithnosharingbranch.
TheheatoftheICismainlydissipatedthroughthethermalpad.
Maximizingthecopperareaconnectedtothethermalpadispreferable.
Inaddition,asolidgroundplaneishelpfulfortheEMIperformance.
FIGURE18.
ISL97701APPLICATIONBOARDGND1VDDOUT2VDD3NSYNC4FB5NC6GND7NEN8VOUT9LX10U1L16.
8HC1100nFC210FJ1VDD_INJ2GND_INJ3GND_OUTJ4NSYNCJ6J7VOUTR1390kR3OPENR639kC8100nF132J1VDDVDDJP3VDDC61nF/50VC73.
3F/50VC94.
7F/10VISL97701NENILAVGIOUTVOUT0.
8VIN-=(EQ.
5)ILPKILAVG12---+IL=(EQ.
6)ILVINVOUTVIN–LVOUTfOSC-=(EQ.
7)TABLE2.
OPTIMALCOMBINATIONOFBOOSTINDUCTORLANDOUTPUTCAPACITORCOUTINDUCTOR(H)CAPACITOR(F)MINMAX4.
72.
2106.
83.
310104.
710156.
810TABLE3.
RECOMMENDEDINDUCTORANDCERAMICCAPACITORMANUFACTURERSINDUCTORCERAMICCAPACITORSumida:www.
sumida.
comTaiyoYuden:www.
t-yuden.
comTDK:www.
tdk.
co.
jpAVX:www.
avxcorp.
comToko:www.
tokoam.
comMurata:www.
murata.
comFN6474Rev1.
00Page10of11February22,2008ISL97701Intersilproductsaremanufactured,assembledandtestedutilizingISO9001qualitysystemsasnotedinthequalitycertificationsfoundatwww.
intersil.
com/en/support/qualandreliability.
htmlIntersilproductsaresoldbydescriptiononly.
Intersilmaymodifythecircuitdesignand/orspecificationsofproductsatanytimewithoutnotice,providedthatsuchmodificationdoesnot,inIntersil'ssolejudgment,affecttheform,fitorfunctionoftheproduct.
Accordingly,thereaderiscautionedtoverifythatdatasheetsarecurrentbeforeplacingorders.
InformationfurnishedbyIntersilisbelievedtobeaccurateandreliable.
However,noresponsibilityisassumedbyIntersiloritssubsidiariesforitsuse;norforanyinfringementsofpatentsorotherrightsofthirdpartieswhichmayresultfromitsuse.
NolicenseisgrantedbyimplicationorotherwiseunderanypatentorpatentrightsofIntersiloritssubsidiaries.
ForinformationregardingIntersilCorporationanditsproducts,seewww.
intersil.
comForadditionalproducts,seewww.
intersil.
com/en/products.
htmlCopyrightIntersilAmericasLLC2007-2008.
AllRightsReserved.
Alltrademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
ISL97701FN6474Rev1.
00Page11of11February22,2008DualFlatNo-LeadPackageFamily(DFN)2X0.
075Cb0.
10CABMDDETAILXPLANESEATING(NLEADSSEEDETAIL"X"1&EXPOSEDPAD)PIN#1I.
D.
PIN#1I.
D.
0.
10(NLEADS)(D2)(E2)BOTTOMVIEWTOPVIEWL1A1(c)2NN-1NN-112AE2X0.
075CBeL534C0.
08CACC2MDP0047DUALFLATNO-LEADPACKAGEFAMILY(JEDECREG:MO-229)SYMBOLMILLIMETERSTOLERANCEDFN8DFN10A0.
850.
90±0.
10A10.
020.
02+0.
03/-0.
02b0.
300.
25±0.
05c0.
200.
20ReferenceD4.
003.
00BasicD23.
002.
25ReferenceE4.
003.
00BasicE22.
201.
50Referencee0.
800.
50BasicL0.
500.
50±0.
10L10.
100MaximumRev.
22/07NOTES:1.
DimensioningandtolerancingperASMEY14.
5M-1994.
2.
Exposedleadatsideofpackageisanon-functionalfeature.
3.
Bottom-sidepin#1I.
D.
maybeadiepadchamfer,anextendedtiebartab,orasmallsquareasshown.
4.
Exposedleadsmayextendtotheedgeofthepackageorbepulledback.
Seedimension"L1".
5.
Inwardendofleadmaybesquareorcircularinshapewithradius(b/2)asshown.
6.
Nisthetotalnumberofleadsonthedevice.
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