User's Guide SLVU143–June2006 TPS74x01EVM-118 This user's guide describes the characteristics, operation, and use of the TPS74x01EVM-118 evaluation module (EVM). This EVM contains either the TPS74201, TPS74301 or TPS74401 low dropout linear regulator IC. This user's guide includes EVM specifications, recommended test setup, test results, bill of materials (BOM),andaschematicdiagram. Contents 1 Introduction.......................................................................................... 1 2 Input/OutputConnectorDescriptions............................................................ 2 3 BoardLayout........................................................................................ 5 4 BillofMaterialsandSchematic................................................................... 8 ListofFigures 1 TPS74201andTPS74401Startupwith1-msSoftStartup ................................... 4 2 TPS74201andTPS74401Startupwith10-msSoftStartup.................................. 4 3 TPS74301SimultaneousStartup................................................................. 4 4 TPS74301RatiometricStartup................................................................... 4 5 TopAssemblyLayer............................................................................... 5 6 TopLayer............................................................................................ 5 7 BottomLayer........................................................................................ 6 8 Schematic ........................................................................................... 7 ListofTables 1 TypicalPerformanceSpecificationSummary................................................... 2 2 HPA118BillofMaterials........................................................................... 8 1 Introduction TheTexasInstrumentsTPS74x01EVM-118evaluationmoduleuseseithertheTPS74201,TPS74301or TPS74401low-dropoutlinearregulatorIC.Theseregulatorsrequirealowpowerbiasvoltage,V ,anda BIAS powerinputvoltage,V .Allthreeregulatorsarecapableofprovidingoutputvoltagesdownto0.8Vand IN haveanintegratedsupervisorycircuitwithopendrainoutputthatgoestohighimpedancewhentheoutput voltagereachesregulation(powergoodorPG).TheTPS74301canprovideupto1.5Adccurrentand hasaTRACKpinwhichallowstheusertoinputarampsignalfortheoutputvoltagetofollow,effectively implementingeithersimultaneousorratiometricsequencing.TheTPS74201andTPS74401canprovide upto1.5Aand3.0Adccurrent,respectively,andhaveaSSpinwhichallowstheusertosettheoutput voltage'slinearramprate.ThegoaloftheEVMistofacilitateevaluationoftheTPS74x01ICs. SLVU143–June2006 TPS74x01EVM-118 1 SubmitDocumentationFeedback

www.ti.com Input/OutputConnectorDescriptions 1.1 Performance Specification Summary Table1providesasummaryoftheTPS74x01EVM-118performancespecifications.Allspecificationsare givenforanambienttemperatureof25(cid:176) C. Table1.TypicalPerformanceSpecificationSummary VOLTAGERANGE CURRENTRANGE CONDITION (V) (mA) MIN TYP MAX MIN TYP MAX V supply 2.62(1) 5.0 5.25 2 BIAS V supply TPS74201(HPA118-002),TPS74301 1.31(1) 3.3 5.25(2) 1500 IN (HPA118-003) TPS74401(HPA118-001) 1.32(1) 3.3 5.25(2) 3000 TPS74201(HPA118-002),TPS74301 1.18(3) 1.20 1.22(3) 1500(2) V (HPA118-003) OUT TPS74401(HPA118-001) 1.18(3) 1.20 1.22(3) 3000(2) (1) ThisistheminimumvoltagetoprovidethemaximumoutputcurrentinthetableassumingthetypicalV voltageisapplied. BIAS LoweroutputcurrentsareachievablewithlowerV andV voltages.SeedatasheetforV toV andV toV IN BIAS IN OUT BIAS OUT dropoutdata. (2) LinearregulatorpowerdissipationiscomputedasP =(V -V )· I .Asspecifiedinthedatasheet,theregulator's D IN OUT OUT packagehasafinitepowerdissipationratingdependingontheambienttemperature,boardtypeandairflow.UsingV and/or IN V voltagesotherthanthetypicalvoltagesrecommendedinthetableorusingtheEVMinanenvironmentwithanambient OUT temperaturehigherthan25(cid:176) Cwillsignificantlyreducethemaximumallowedoutputcurrent.Seethedatasheetfortheregulator package'sthermalresistancedataandrefertoapplicationnoteSLVA118entitledDigitalDesigner'sGuidetoLinearVoltage RegulatorsandThermalManagementforafullexplanation. (3) TheEVMuses– 1%feedbackresistors.Therefore,theEVMoutputtoleranceisthe– 1%internalreferencetoleranceplus2· (1 -V /V )· TOL =2· (1-0.8V/1.2V)· – 1%=0.7%or– 1.7%.Fortigheroutputtolerance,tightertolerancefeedback REF OUT FBRES resistorsmustbeused. 1.2 Modifications ToaidusercustomizationoftheEVM,theboardwasdesignedwithdeviceshaving0603orlarger footprints.Arealimplementationwouldlikelyoccupylesstotalboardspace. ChangingcomponentscanimproveordegradeEVMperformance.Forexample,addingalargeroutput capacitorwillreduceoutputvoltageundershootbutlengthenresponsetimeafteraloadtransientevent. 2 Input/Output Connector Descriptions J1–VIN/GNDThisterminalblockhasbothapositiveandgroundreturnconnectiontothepowerinput(V ) IN supply.Theleadstotheinputsupplyshouldbetwistedandkeptasshortaspossible. J2–GNDThisheaderisthereturnconnectionforthebias(V )supply. BIAS J3–VINThisheaderisapositiveconnectiontothepowerinputsupply(V ).Itsuseisrecommendedfor IN lowpower(i.e.,I =I <1A)evaluationorasavoltagetestpoint. IN OUT J4–VBIASThisheaderisthepositiveconnectionforthebias(V )supply. BIAS J5–GNDThisheaderisagroundreturnconnectiontothepowerinput(V )supply.Itsuseis IN recommendedforlowpower(i.e.,I =I <1A)evaluationorasagroundtestpoint. IN OUT J6–VOUTThisheaderisthepositiveconnectionfortheoutputloadonV .Itsuseisrecommendedfor OUT lowpower(i.e.,I =I <1A)evaluationonlyorasavoltagetestpoint. IN OUT J7–GNDThisheaderisthegroundreturnconnectionfortheoutputload.Itsuseisrecommendedforlow power(i.e.,I =I <1A)evaluationorasagroundtestpoint. IN OUT J8–VOUT/GNDThisterminalblockhasbothapositiveandgroundreturnconnectionfortheoutputload. Theleadstotheoutputloadshouldbetwistedandkeptasshortaspossible. 2 TPS74x01EVM-118 SLVU143–June2006 SubmitDocumentationFeedback

www.ti.com Input/OutputConnectorDescriptions J9–TRACKINThisheaderconnectstotopresistorofaresistordividerwhosemidpointconnectstothe TRACKINpinoftheTPS74301.Anexternalvoltagegreaterthan0.8Vmustbeappliedtothispinforthe TPS74301toproduceanoutputvoltage.ThisheaderisnotpopulatedontheTPS74201orTPS74401 EVM. J10–ENThisheaderisaconnectiontotheenablepin(EN),whichisalsoconnectedtothemiddlepinof S1.WhenS1isOFF,theENpinispulledtogroundthroughpull-downresistor. J11–GNDThisheaderisagroundconnection. JP1–1ms/Simultvs.10ms/RatioFortheTPS74301,thisjumperallowstheusertoselectthe appropriateresistordividerforeithersimultaneousorratiometricsequencing.Theseresistorshavebeen sizedpertheequationsindatasheetFigure5assuminganexternal3.3VrampsignalisappliedtoJ9 TRACKINpin.SelectingSIMULTaneousresultsintheTPS74301outputvoltagefollowingtheexternal rampsignalwithinafewmillivoltsuntiltheTPS74301reachesitsregulatedvoltage.TheTPS74301output voltagewillhavethesameramprate(dv/dt)astheexternalrampsignalbutadifferentsoft-starttime. SelectingRATIOmetricresultsintheTPS74301outputvoltagereachingitsregulatedvoltageatthesame timeastheexternallyappliedtrackingsignalreachesitsmaximumvoltage(e.g.,3.3V).Althoughthe externalrampsignalandtheTPS74301willhavedifferentramprates,theywillhavethesamesoft-start time.Leavingthejumperopenandnotapplyingthetracksignalresultsinnooutputvoltage.Leavingthe jumperopenandapplyingadctracksignalgreaterthan0.8Vresultsintheoutputvoltagerampingupwith defaultsoft-starttimeof500us. FortheTPS74201andTPS74401,thisjumperallowstheusertochooseeither1msor10mssoftstart timefortheoutputvoltage.Leavingthejumperopenresultsintheoutputvoltagerampingupwithdefault soft-starttimeof500us. S1-ThisswitchconnectstotheENpinoftheICandallowstheusertoturntheICONorOFFby connectingenabletoeitherV orgroundthroughapull-downresistor. BIAS TP1-ThisisaKelvintestpointtoV . IN TP2-ThisisaKelvintestpointtoICground. TP3-ThisisaKelvintestpointtoV . OUT 2.1 Test Setup TheabsolutemaximumvoltageallowedontheBIAS,IN,ENorTRACKpinsis6V.AllthreeTPS74x01 devicesaredesignedtooperatewithV andV lessthanorequalto5.25V.TheTPS74201and IN BIAS TPS74401canhaveV ,V ,andV appliedinanyorderwithoutcausingdamagetothedevice. IN BIAS ENABLE However,forthesoft-startfunctiontoworkasintendedcertainsequencingrulesmustbeapplied.WithS1 intheOFFposition,connectingtheENandINpinsthroughajumperwireisacceptableformost applicationsaslongasV isgreaterthan1.1VandtheramprateofbothV andV isfasterthanthe IN IN BIAS programmedsoft-startramprate.Iftheramprateoftheinputsourcesisslowerthanthesetsoft-starttime theoutputwilltracktheslowersupplyminusthedropoutvoltageuntilitreachesthesetoutputvoltage.If ENisconnectedtoBIAS(e.g.,byplacingS1intheONpositionontheEVM),thedevicewillsoft-startas programmedaslongasV ispresentbeforeV .Figure5inthedatasheetshowstheuseofanRC IN BIAS delaycircuittoholdoffV untilV hasramped.ThistechniquecanalsobeusedtodriveV from EN BIAS EN V .IfV >2.375VandV >1.1VbeforeV isappliedthenV tracksthelowerofV orV IN BIAS EN IN OUT IN SS *(1+R1/R2),whereV isthevoltageontheSSpinandisclampedto0.8V.WithS1intheOFFposition, SS anexternalcontrolsignalcanalsobeusedtoenablethedeviceafterV andV arepresent. IN BIAS TheTPS74301canalsohaveV ,V ,V ,andV sequencedinanyorderwithoutcausing IN BIAS EN TRACK damagetothedevice.Howeverforthetrackfunctiontoworkasintendedcertainsequencingrulesmust beapplied.V mustbeabove2.375VandV mustbeabove1.1V(e.g.,S1intheONpositiontying BIAS EN theBIASandENpinstogether)beforetheexternallyappliedtracksignalstartstoramp.V shouldramp IN upfasterthanthetrackingsignalsothattheexternallyappliedtrackingsignaldoesnotdrivethedevice intoV dropoutasV rampsup.ThepreferredmethodtosequencetheTPS74301isforV ,V and IN OUT IN BIAS V tobeabovetheirminimumrequiredvoltagesbeforethetrackingsignalisappliedandinitatesoutput EN voltageramping.Ifthetrackingfeatureisnotneeded,theTRACKpinshouldbeconnectedtoV . IN Configuredthisway,thedevicestartsupwithin50uswhichmayresultinlargeinrushcurrentthatcould causetheinputsupplytomomentarilydip.Also,iftheV =V rampsfasterthan500us,theoutput IN TRACK voltagemayovershoot. SLVU143–June2006 TPS74x01EVM-118 3 SubmitDocumentationFeedback

www.ti.com Input/OutputConnectorDescriptions Whenconnectingexternalloadsabove1A,useshort,twistedleadsconnectedtothescrewterminalsin ordertominimizeDCdropattheconnectorand/orinductivevoltagedipafteratransientloadisremoved. 2.2 Test Results BelowarethetestresultsatT =25(cid:176) CusingthisEVM: A A V =5V,V /I =1.2V/1A. A V =5V,V /I =1.2V/1A. IN OUT OUT IN OUT OUT Figure1.TPS74201andTPS74401Startupwith Figure2.TPS74201andTPS74401Startupwith 1-msSoftStartup 10-msSoftStartup A V =5V,V /I =1.2V/1Awith A V =5V,V /I =1.2V/1Awithwith IN OUT OUT IN OUT OUT TRACK-INsignalprovidedbyTPS74201 TRACK-INsignalprovidedbyTPS74201 configuredfor3.3Vand10msstartup configuredfor3.3Vand10msstartup Figure3.TPS74301SimultaneousStartup Figure4.TPS74301RatiometricStartup 4 TPS74x01EVM-118 SLVU143–June2006 SubmitDocumentationFeedback

www.ti.com BoardLayout 3 Board Layout Boardlayoutiscriticalforallswitchmodepowersupplies.Figure5,Figure6,andFigure7showtheboard layoutfortheHPA118PWB.Theswitchingnodeswithhigh-frequencynoiseareisolatedfromthe noise-sensitivefeedbackcircuitry,andcarefulattentionhasbeengiventotheroutingofhigh-frequency currentloops.Seethedatasheetformorespecificlayoutguidelines. Figure5.TopAssemblyLayer Figure6.TopLayer SLVU143–June2006 TPS74x01EVM-118 5 SubmitDocumentationFeedback

www.ti.com BoardLayout Figure7.BottomLayer 6 TPS74x01EVM-118 SLVU143–June2006 SubmitDocumentationFeedback

www.ti.com BoardLayout Figure8.Schematic SLVU143–June2006 TPS74x01EVM-118 7 SubmitDocumentationFeedback

www.ti.com BillofMaterialsandSchematic 4 Bill of Materials and Schematic 4.1 Bill of Materials Table2.HPA118BillofMaterials Count RefDes Value Description Size PartNumber MFR -001 -002 -003 2 2 2 C1,C2 1.0m F Capacitor,Ceramic,25V,X5R,10% 0603 C1608X5R1E105K TDK 1 1 1 C3 4.7m F Capacitor,Ceramic,6.3V,X5R, 0603 C1608X5R0J475K TDK 10% 1 1 0 C4 1000 Capacitor,Ceramic,50V,C0G,5% 0603 C1608C0G1H102JB TDK pF 1 1 0 C5 0.01 Capacitor,Ceramic,50V,X7R,10% 0603 C1608X7R1H103KB TDK m F 0 0 0 C6,C7, Open Capacitor,Multi-pattern,603-Dcase 7343(D) C8,C9 2 2 2 J1,J8 TerminalBlock,2pin,6A,3.5mm 0.27x0.25 ED1514 OST 8 8 8 J2-J7, Header,2pin,100milspacing, 0.100x2 PTC36SAAN Sullins J10,J11 (36-pinstrip) 0 0 1 J9 Header,2pin,100milspacing, 0.100x2 PTC36SAAN Sullins (36-pinstrip) 1 1 1 JP1 Header,3pin,100milspacing, 0.100x3 PTC36SAAN Sullins (36-pinstrip) 1 1 1 R1 2.49 Resistor,Chip,1/16W,1% 0603 Std Std kW 1 1 1 R2 4.99 Resistor,Chip,1/16W,1% 0603 Std Std kW 1 1 1 R3 10.0 Resistor,Chip,1/16W,1% 0603 Std Std kW 0 0 1 R4 4.99 Resistor,Chip,1/16W,1% 0603 Std Std kW 0 0 1 R5 10.0 Resistor,Chip,1/16W,1% 0603 Std Std kW 0 0 1 R6 1.78 Resistor,Chip,1/16W,1% 0603 Std Std kW 1 1 1 R7 100kW Resistor,Chip,1/16W,1% 0603 Std Std 1 1 1 S1 Switch,1P2T,Slide,PCmount, 0.46x0.16 EG1218 E_Switch 200mA 4 4 4 TP1- TestPoint,Red,ThruHoleColor 0.100x0.100 5000 Keystone TP4 Keyed 1 0 0 U1 IC,3.0ALDOWithProgrammable QFN-20 TPS74401RGW TI SoftStart 0 1 0 IC,1.5ALDOWithProgrammable QFN-20 TPS74201RGW TI SoftStart 0 0 1 IC,1.5ALDOWithProgrammable QFN-20 TPS74301RGW TI Sequencing 1 1 1 -- PCB,2.7Inx1.345Inx0.062In HPA118 Any 1 1 1 -- Shunt,100mil,Black 0.100 929950-00 8 TPS74x01EVM-118 SLVU143–June2006 SubmitDocumentationFeedback

EVALUATIONBOARD/KITIMPORTANTNOTICE TexasInstruments(TI)providestheenclosedproduct(s)underthefollowingconditions: Thisevaluationboard/kitisintendedforuseforENGINEERINGDEVELOPMENT,DEMONSTRATION,OREVALUATION PURPOSESONLYandisnotconsideredbyTItobeafinishedend-productfitforgeneralconsumeruse.Personshandlingthe product(s)musthaveelectronicstrainingandobservegoodengineeringpracticestandards.Assuch,thegoodsbeingprovidedare notintendedtobecompleteintermsofrequireddesign-,marketing-,and/ormanufacturing-relatedprotectiveconsiderations, includingproductsafetyandenvironmentalmeasurestypicallyfoundinendproductsthatincorporatesuchsemiconductor componentsorcircuitboards.Thisevaluationboard/kitdoesnotfallwithinthescopeoftheEuropeanUniondirectivesregarding electromagneticcompatibility,restrictedsubstances(RoHS),recycling(WEEE),FCC,CEorUL,andthereforemaynotmeetthe technicalrequirementsofthesedirectivesorotherrelateddirectives. Shouldthisevaluationboard/kitnotmeetthespecificationsindicatedintheUser’sGuide,theboard/kitmaybereturnedwithin30 daysfromthedateofdeliveryforafullrefund.THEFOREGOINGWARRANTYISTHEEXCLUSIVEWARRANTYMADEBY SELLERTOBUYERANDISINLIEUOFALLOTHERWARRANTIES,EXPRESSED,IMPLIED,ORSTATUTORY,INCLUDING ANYWARRANTYOFMERCHANTABILITYORFITNESSFORANYPARTICULARPURPOSE. Theuserassumesallresponsibilityandliabilityforproperandsafehandlingofthegoods.Further,theuserindemnifiesTIfromall claimsarisingfromthehandlingoruseofthegoods.Duetotheopenconstructionoftheproduct,itistheuser’sresponsibilityto takeanyandallappropriateprecautionswithregardtoelectrostaticdischarge. EXCEPTTOTHEEXTENTOFTHEINDEMNITYSETFORTHABOVE,NEITHERPARTYSHALLBELIABLETOTHEOTHER FORANYINDIRECT,SPECIAL,INCIDENTAL,ORCONSEQUENTIALDAMAGES. TIcurrentlydealswithavarietyofcustomersforproducts,andthereforeourarrangementwiththeuserisnotexclusive. TIassumesnoliabilityforapplicationsassistance,customerproductdesign,softwareperformance,orinfringementof patentsorservicesdescribedherein. PleasereadtheUser’sGuideand,specifically,theWarningsandRestrictionsnoticeintheUser’sGuidepriortohandlingthe product.Thisnoticecontainsimportantsafetyinformationabouttemperaturesandvoltages.ForadditionalinformationonTI’s environmentaland/orsafetyprograms,pleasecontacttheTIapplicationengineerorvisitwww.ti.com/esh. NolicenseisgrantedunderanypatentrightorotherintellectualpropertyrightofTIcoveringorrelatingtoanymachine,process,or combinationinwhichsuchTIproductsorservicesmightbeorareused. FCCWarning Thisevaluationboard/kitisintendedforuseforENGINEERINGDEVELOPMENT,DEMONSTRATION,OREVALUATION PURPOSESONLYandisnotconsideredbyTItobeafinishedend-productfitforgeneralconsumeruse.Itgenerates,uses,and canradiateradiofrequencyenergyandhasnotbeentestedforcompliancewiththelimitsofcomputingdevicespursuanttopart15 ofFCCrules,whicharedesignedtoprovidereasonableprotectionagainstradiofrequencyinterference.Operationofthis equipmentinotherenvironmentsmaycauseinterferencewithradiocommunications,inwhichcasetheuserathisownexpense willberequiredtotakewhatevermeasuresmayberequiredtocorrectthisinterference.

EVMWARNINGSANDRESTRICTIONS ItisimportanttooperatethisEVMwithintheinputvoltageof5Vandtheoutputvoltageof3.3V. Exceedingthespecifiedinputrangemaycauseunexpectedoperationand/orirreversibledamage totheEVM.Iftherearequestionsconcerningtheinputrange,pleasecontactaTIfield representativepriortoconnectingtheinputpower. Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/or possiblepermanentdamagetotheEVM.PleaseconsulttheEVMUser'sGuidepriorto connectinganyloadtotheEVMoutput.Ifthereisuncertaintyastotheloadspecification,please contactaTIfieldrepresentative. Duringnormaloperation,somecircuitcomponentsmayhavecasetemperaturesgreaterthan 25(cid:176) C.TheEVMisdesignedtooperateproperlywithcertaincomponentsabove25(cid:176) Caslongas theinputandoutputrangesaremaintained.Thesecomponentsincludebutarenotlimitedto linearregulators,switchingtransistors,passtransistors,andcurrentsenseresistors.Thesetypes ofdevicescanbeidentifiedusingtheEVMschematiclocatedintheEVMUser'sGuide.When placingmeasurementprobesnearthesedevicesduringoperation,pleasebeawarethatthese devicesmaybeverywarmtothetouch. MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265 Copyright©2006,TexasInstrumentsIncorporated

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