User's Guide SLVU217–July2007 TPS62290EVM-279 This user’s guide describes the characteristics, operation, and use of the TPS62290EVM-279 evaluation module (EVM). This EVM demonstrates the Texas Instruments TPS62290, 2.25-MHz, synchronous, step-down converter capable of providing 1 A of output current. This user’s guide includes setup instructions, a schematic diagram, a bill of materials (BOM), and PCB layout drawings for the evaluation module. Contents 1 Introduction................................................................................................................... 2 2 Setup.......................................................................................................................... 2 3 Operation..................................................................................................................... 2 4 TestResults.................................................................................................................. 3 5 BoardLayout................................................................................................................. 5 6 SchematicandBillofMaterials............................................................................................ 7 ListofFigures 1 Start-upFromEnable,Vin=3V,Vout=1.8V,Iload=1000mA......................................................... 3 2 OutputVoltageRipple,Vin=3V,Vout=1.8V,Iload=1000mA......................................................... 3 3 LoadTransient,460-mAto920-mAStep,Vin=3V,Vout=1.8V...................................................... 4 4 LoadTransient,920-mAto460-mAStep................................................................................. 4 5 AssemblyLayer.............................................................................................................. 5 6 TopLayerRouting........................................................................................................... 6 7 BottomLayerRouting....................................................................................................... 6 8 TPS62290EVM-279LayerRoutingSchematic.......................................................................... 7 ListofTables 1 TPS62290EVM-279BillofMaterials...................................................................................... 8 SLVU217–July2007 TPS62290EVM-279 1 SubmitDocumentationFeedback

www.ti.com Introduction 1 Introduction TheTPS62290EVM-279evaluationmodule(EVM)helpsdesignersevaluatetheoperationand performanceoftheTPS62290DC/DCconverter.Thisconverterisa2.25-MHz,synchronous,step-down convertercapableof1Aofoutputcurrent. 1.1 Related Documentation From Texas Instruments TPS62290,1-AStepDownConverterin2x2SONPackagedatasheet(SLVS764) 2 Setup ThissectiondescribesthejumpersandconnectorsontheEVMaswellashowtoproperlyconnect,set up,andusetheTPS62290EVM-279. 2.1 Input/Output Connector Descriptions 2.1.1 J1—VIN Thisisthepositiveinputsupplyvoltage.Twisttheleadstotheinputsupplyandkeepthemasshortas possibletominimizeEMItransmission. 2.1.2 J2—GND Thisisthereturnconnectionfortheinputpowersupplyoftheconverter. 2.1.3 J3—VOUT Thisisthepositiveconnectionfromtheoutput.Connectthispintothepositiveinputoftheload. 2.1.4 J4—GND Thisisthereturnconnectionfortheoutput. 2.1.5 JP1—ENABLE Thisjumperenablesordisablestheconverter.Connectingtheshortingjumperbetweenpins1and2(VIN andEN)enablestheconverter.Connectingtheshortingjumperbetweenpins2and3(ENandGND) disablestheconverter.Neverleavethispinfloating. 2.1.6 JP2—MODE ThisjumpersetsthemodeoftheTPS62290.Connectingtheshortingjumperbetweenpins1and2(VIN andMODE)forcestheTPS62290intofixedfrequencyPWMmode.Connectingtheshortingjumper betweenpins2and3(MODEandGND)enablesthePowerSavemodewithautomatictransitionfrom PFMmodetofixedfrequencyPWMmode.Neverleavethispinfloating. 3 Operation ConnectthepositiveinputpowersupplytoJ1.Connecttheinputpowerreturn(ground)toJ2.The TPS62290EVM-279hasanabsolutemaximuminputvoltageof7V.Therecommendedmaximum operatingvoltageis6V. ConnectthedesiredloadbetweenJ3andJ4.TheTPS62290EVM-279cansupplyupto1Aofoutput current. ConfigurejumpersJP1andJP2asrequired.ThefunctionsofJP1andJP2aredescribedintheSet-up sectionofthismanual. 2 TPS62290EVM-279 SLVU217–July2007 SubmitDocumentationFeedback

www.ti.com TestResults 4 Test Results ThissectionprovidestypicalperformancewaveformsfortheTPS62290EVM-279printed-circuitboard. Enable V OUT I LOAD Figure1.Start-upFromEnable,Vin=3V,Vout=1.8V,Iload=1000mA V OUT I INDUCTOR Figure2.OutputVoltageRipple,Vin=3V,Vout=1.8V,Iload=1000mA SLVU217–July2007 TPS62290EVM-279 3 SubmitDocumentationFeedback

www.ti.com TestResults V OUT 920 mA I LOAD 460 mA Figure3.LoadTransient,460-mAto920-mAStep,Vin=3V,Vout=1.8V V OUT I LOAD 920 mA 460 mA Figure4.LoadTransient,920-mAto460-mAStep 4 TPS62290EVM-279 SLVU217–July2007 SubmitDocumentationFeedback

www.ti.com BoardLayout 5 Board Layout ThissectionprovidestheTPS62290EVM-279boardlayoutandillustrations. 5.1 Layout Boardlayoutiscriticalforallhigh-frequencyswitchmodepowersupplies.Figure5throughFigure7show theboardlayoutfortheTPS62290EVM-279PCB.Thenodeswithhigh-switchingfrequenciesandcurrents arekeptasshortaspossibletominimizetraceinductance.Carefulattentionhasbeengiventotherouting ofhigh-frequencycurrentloopsandasingle-pointgroundingschemeisused.Seethedatasheetfor specificlayoutguidelines. Figure5.AssemblyLayer SLVU217–July2007 TPS62290EVM-279 5 SubmitDocumentationFeedback

www.ti.com BoardLayout Figure6.TopLayerRouting Figure7.BottomLayerRouting 6 TPS62290EVM-279 SLVU217–July2007 SubmitDocumentationFeedback

www.ti.com SchematicandBillofMaterials 6 Schematic and Bill of Materials ThissectionprovidestheTPS62290EVM-279schematicandbillofmaterials. 6.1 Schematic Figure8. TPS62290EVM-279LayerRoutingSchematic SLVU217–July2007 TPS62290EVM-279 7 SubmitDocumentationFeedback

www.ti.com SchematicandBillofMaterials 6.2 Bill of Materials Table1.TPS62290EVM-279BillofMaterials Count ReDes Value Description Size PartNumber MFR 2 C1,C3 10μF Capacitor,Ceramic,6.3V,X5R,20% 0603 GRM188R60J106ME47D Murata 1 C2 22pF Capacitor,Ceramic,50V,C0G,5% 0603 C1608C0G1H220J TDX 4 J1–J4 Header,2pin,100milspacing(36-pinstrip) 0.100· 2 PTC36SAAN Sullins 2 JP1,JP2 Header,3pin,100milspacing(36-pinstrip) 0.100· 3 PTC36SAAN Sullins 1 L1 2.2μH Industor,SMT,1.5A,110mW 0.118· 0.118 LPS3015-222ML Coilcraft 1 R1 365k Resistor,Chip,1/16W,1% 0603 Std Std 1 R2 182k Resistor,Chip,1/16W,1% 0603 Std Std 1 U1 IC,2.25MHz1AStep-DownConverter SON-6[DRV] TPS62290DRV TI 1 – PCB,1.4In· 1.2In· 0.062In HPA279 Any 2 – Shunt,100mil,Black 0.100 929950-00 3M 8 TPS62290EVM-279 SLVU217–July2007 SubmitDocumentationFeedback

EVALUATIONBOARD/KITIMPORTANTNOTICE TexasInstruments(TI)providestheenclosedproduct(s)underthefollowingconditions: Thisevaluationboard/kitisintendedforuseforENGINEERINGDEVELOPMENT,DEMONSTRATION,OREVALUATIONPURPOSES ONLYandisnotconsideredbyTItobeafinishedend-productfitforgeneralconsumeruse.Personshandlingtheproduct(s)musthave electronicstrainingandobservegoodengineeringpracticestandards.Assuch,thegoodsbeingprovidedarenotintendedtobecomplete intermsofrequireddesign-,marketing-,and/ormanufacturing-relatedprotectiveconsiderations,includingproductsafetyandenvironmental measurestypicallyfoundinendproductsthatincorporatesuchsemiconductorcomponentsorcircuitboards.Thisevaluationboard/kitdoes notfallwithinthescopeoftheEuropeanUniondirectivesregardingelectromagneticcompatibility,restrictedsubstances(RoHS),recycling (WEEE),FCC,CEorUL,andthereforemaynotmeetthetechnicalrequirementsofthesedirectivesorotherrelateddirectives. Shouldthisevaluationboard/kitnotmeetthespecificationsindicatedintheUser’sGuide,theboard/kitmaybereturnedwithin30daysfrom thedateofdeliveryforafullrefund.THEFOREGOINGWARRANTYISTHEEXCLUSIVEWARRANTYMADEBYSELLERTOBUYER ANDISINLIEUOFALLOTHERWARRANTIES,EXPRESSED,IMPLIED,ORSTATUTORY,INCLUDINGANYWARRANTYOF MERCHANTABILITYORFITNESSFORANYPARTICULARPURPOSE. Theuserassumesallresponsibilityandliabilityforproperandsafehandlingofthegoods.Further,theuserindemnifiesTIfromallclaims arisingfromthehandlingoruseofthegoods.Duetotheopenconstructionoftheproduct,itistheuser’sresponsibilitytotakeanyandall appropriateprecautionswithregardtoelectrostaticdischarge. EXCEPTTOTHEEXTENTOFTHEINDEMNITYSETFORTHABOVE,NEITHERPARTYSHALLBELIABLETOTHEOTHERFORANY INDIRECT,SPECIAL,INCIDENTAL,ORCONSEQUENTIALDAMAGES. TIcurrentlydealswithavarietyofcustomersforproducts,andthereforeourarrangementwiththeuserisnotexclusive. TIassumesnoliabilityforapplicationsassistance,customerproductdesign,softwareperformance,orinfringementofpatentsor servicesdescribedherein. PleasereadtheUser’sGuideand,specifically,theWarningsandRestrictionsnoticeintheUser’sGuidepriortohandlingtheproduct.This noticecontainsimportantsafetyinformationabouttemperaturesandvoltages.ForadditionalinformationonTI’senvironmentaland/or safetyprograms,pleasecontacttheTIapplicationengineerorvisitwww.ti.com/esh. NolicenseisgrantedunderanypatentrightorotherintellectualpropertyrightofTIcoveringorrelatingtoanymachine,process,or combinationinwhichsuchTIproductsorservicesmightbeorareused. FCCWarning Thisevaluationboard/kitisintendedforuseforENGINEERINGDEVELOPMENT,DEMONSTRATION,OREVALUATIONPURPOSES ONLYandisnotconsideredbyTItobeafinishedend-productfitforgeneralconsumeruse.Itgenerates,uses,andcanradiateradio frequencyenergyandhasnotbeentestedforcompliancewiththelimitsofcomputingdevicespursuanttopart15ofFCCrules,whichare designedtoprovidereasonableprotectionagainstradiofrequencyinterference.Operationofthisequipmentinotherenvironmentsmay causeinterferencewithradiocommunications,inwhichcasetheuserathisownexpensewillberequiredtotakewhatevermeasuresmay berequiredtocorrectthisinterference. EVMWARNINGSANDRESTRICTIONS ItisimportanttooperatethisEVMwithintheinputvoltagerangeof2Vto6Vandtheoutputvoltagerangeof0.6Vto6V. Exceedingthespecifiedinputrangemaycauseunexpectedoperationand/orirreversibledamagetotheEVM.Iftherearequestions concerningtheinputrange,pleasecontactaTIfieldrepresentativepriortoconnectingtheinputpower. Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/orpossiblepermanentdamagetotheEVM. PleaseconsulttheEVMUser'sGuidepriortoconnectinganyloadtotheEVMoutput.Ifthereisuncertaintyastotheloadspecification, pleasecontactaTIfieldrepresentative. Duringnormaloperation,somecircuitcomponentsmayhavecasetemperaturesgreaterthan85(cid:176) C.TheEVMisdesignedtooperate properlywithcertaincomponentsabove85(cid:176) Caslongastheinputandoutputrangesaremaintained.Thesecomponentsincludebutare notlimitedtolinearregulators,switchingtransistors,passtransistors,andcurrentsenseresistors.Thesetypesofdevicescanbeidentified usingtheEVMschematiclocatedintheEVMUser'sGuide.Whenplacingmeasurementprobesnearthesedevicesduringoperation, pleasebeawarethatthesedevicesmaybeverywarmtothetouch. MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265 Copyright©2007,TexasInstrumentsIncorporated

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