User's Guide SNVA427B–January2010–RevisedApril2013 AN-2031 LMZ12003 3A Demo Board SIMPLE SWITCHER® Power Module Quick Start Guide 1 Description TheLMZ12003SIMPLESWITCHERpowermoduleisacomplete,easytousestep-downDC-DCsolution capableofdrivingupto3AloadTheLMZ12003isavailableinaninnovative,easytousepackagethat enhancesthermalperformanceandallowsforhandormachinesoldering. TheLMZ12003demoboardcanacceptaninputvoltagerailbetween4.5Vand20Vanddeliveran adjustableandhighlyaccurateoutputvoltageaslowas0.8V.TheLMZ12003onlyrequiresthreeexternal resistorsandfourexternalcapacitorstocompletethepowersolution.TheLMZ12003isareliableand robustsolutionwiththefollowingprotectionfeatures:thermalshutdown,inputunder-voltagelockout (UVLO),outputover-voltageprotection(OVP),short-circuitprotection,outputcurrentlimit,andallows startupintoapre-biasedoutput.Asingleresistoradjustsswitchingfrequencyupto1MHz. 2 Packaging Highlights • 7leadmodulepackage(SimilartoTO-263) • Singleexposeddieattachpadforenhancedthermalperformance • 10.2x13.8x4.6mmmodulepackage • Highpowerdensity • 1.7”x2.3”reducedsizedemoboardformfactor 3 Demo Board Features • Powerinputvoltagerange4.5V-20V • UVLOprogrammedat4.5V • Adjustableoutputvoltagerange0.8Vto6V • Upto3Aoutputcurrent • Integratedshieldedinductorinmodule • Efficiencyupto92% • Allceramiccapacitordesign • Noloopcompensationrequired • Startsintopre-biasedloads • Shortcircuitprotection • Thermalshutdown • Only9externalpassivesplusmodule • 2layerlowcostassembly SIMPLESWITCHERisaregisteredtrademarkofTexasInstruments. Allothertrademarksarethepropertyoftheirrespectiveowners. SNVA427B–January2010–RevisedApril2013 AN-2031LMZ120033ADemoBoardSIMPLESWITCHER®PowerModule 1 SubmitDocumentationFeedback QuickStartGuide Copyright©2010–2013,TexasInstrumentsIncorporated

TypicalApplications www.ti.com 4 Typical Applications • Pointofloadconversionsfrom5Vand12Vinputrails • Spaceconstrainedapplications • Industrialcontrols • Telecom • Networkingequipment Figure1.FrontView 2 AN-2031LMZ120033ADemoBoardSIMPLESWITCHER®PowerModule SNVA427B–January2010–RevisedApril2013 QuickStartGuide SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

www.ti.com TypicalApplications Figure2.BackView Table1.AbsoluteMaximumModuleRatings VIN,RONtoGND -0.3Vto25V EN,FB,SStoGND -0.3Vto7V Table2.ModuleOperatingRatings VIN 4.5Vto20V EN(Inputonpin3modulepin) 0Vto6.5V JunctionTemperatureRange(Tj) -40Cto+125C Table3.DemoBoardOperatingRatings VIN 4.5Vto20V VOUT(Defaultsetting) 1.8V IOUT 0Ato3A EN(Inputondemoboardpost) 0Vto20V UVLOsettingonENableinput 4.5V Soft-starttime 2.2mSec OperatingTemperatureRange(Tj) -40Cto+70C(atfull3Aload) SNVA427B–January2010–RevisedApril2013 AN-2031LMZ120033ADemoBoardSIMPLESWITCHER®PowerModule 3 SubmitDocumentationFeedback QuickStartGuide Copyright©2010–2013,TexasInstrumentsIncorporated

DemoBoardSchematic www.ti.com 5 Demo Board Schematic U1 EP Enable VIN LMZ12003TZ-ADJ T VIN RON EN GND SS FB VOU 1.8VO @ 3A 1 2 3 4 5 6 7 4.5V to 20V RENT CFF 32.4k RON 0.022 PF RFBT 32.4k 1.87k CIN1 CSS RFBB CO1 CO2 RENB 10 PF 0.022 PF 1.50k 1 PF 100 PF 11.8k 6 Demo Board Bill of Materials (BOM) Table4.BoardBillofMaterials(BOM) RefDes Description Case ManufacturerPartNumber Ron 32.4kohm1%resistor 603 Rent 32.4kohm1%resistor 603 Renb 11.8kohm1%resistor 603 Rfbt 1.87kohm1%resistor 603 Rfbb 1.50kohm1%resistor 603 Cff 0.022uF50VX7Rceramic 603 capacitor Css 0.022uF50VX7Rceramic 603 capacitor Cin 10uF50VX5Rceramic 1210 UMK325BJ106MM-T capacitor Cout1 1.0uF50VX7Rceramic 1206 UMK316B7105KL-T capacitor Cout2 100uF6.3VX5Rceramic 1210 JMK325BJ107MM-T capacitor U1 LMZ12003SIMPLE TO-PMOD LMZ12003TZ-ADJ SWITCHERPowerModule 4 AN-2031LMZ120033ADemoBoardSIMPLESWITCHER®PowerModule SNVA427B–January2010–RevisedApril2013 QuickStartGuide SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

www.ti.com DemoBoardHookup Table4.BoardBillofMaterials(BOM)(continued) RefDes Description Case ManufacturerPartNumber Alternateresistorvaluesforalternativeoutputvoltages VOUT RFBT RFBB RON 6 2.49k 383Ω 124k 5 5.62k 1.07k 100k 3.3 3.32k 1.07k 61.9k 2.5 2.26k 1.07k 47.5k 1.8 1.87k 1.50k 32.4k 1.5 1.00k 1.13k 28.0k 1.2 4.22k 8.45k 22.6k 0.8 0.0K 39.2k 24.9k 7 Demo Board Hookup VOUTConnecttheloadtoV andoneoftheGNDposts.Themodulecansourceuptoa3Aload OUT current. ConnectVINtoapositivevoltageinthe4.5to20Vrange.Connectthenegativeterminalofthesource supplytooneofthepostslabeledGND. TheEnableinputpostisconfiguredfordirectconnectiontotheVinpost.Withthechosenresistorvalues thisresultsinanundervoltagelockoutlevelof4.5Vinput.ThetopenableresistorisRENT(akaREN1) andthebottomenableresistorisRENB(akaREN2). IftheEnablepostisdisconnected,themodulewillbedisabledandabout20uAofsupplycurrentwillflow fromVintogroundwhileinthedisabledmode.WiththeenableinputconnectedtoVinviatheresistor dividertherewillbeabout1.5mAofno-loadquiescentcurrentintotheVininput.Additionalcurrentflows intotheenabledividerstring. 8 Demo Board Passive Components Soft-startcapacitor:Thesoft-startcapacitorcontrolstherisetimeoftheoutputvoltagewhenpoweris firstappliedandfollowingtheclearingofafaultmode. Feedbackdivider:Regulatoroutputvoltageisprogrammedthoughtheselectionofthetworesistors. RFBT(akaRFB1)andRFB(akaRFB2)Afeedforwardcapacitor(CFF)islocatedinparallelwiththe upperfeedbackdividerresistor.Thiscapacitorimprovesthestepresponsetoabruptchangesinload current.Foradifferentoutputvoltage,seeTable4whenmodifyingtheboard.Resistorvaluesshownwill minimizeerrorinoutputvoltagesetting. RONResistor:TheprimaryfunctionoftheRONresistoristosettheOn-Timeintervaloftheinternal controlsectionswitchingcycle.ThesecondaryfunctionoftheRONresistoristocreateanearlyconstant operatingfrequencyovertheinputoperatingvoltagerange.Iftheoutputvoltageoftheregulatoris changedbyadjustingthefeedbackdividerthenitisgenerallyrequiredthattheRONresistorvaluealsobe changedinordertomaintainthesameoperatingfrequency. Cout:Aparallelconnectionofa1µF50Vanda100µF6.3Vmultilayerceramicareusedfortheoutput capacitor.LocationsareprovidedonthePCBassemblyforexperimentingwithadditionaloutput capacitors.. Cin:A10uF50Vmultilayerceramicisconnectedastheinputfilter.LocationsareprovidedonthePCB assemblyforexperimentingwithadditionalinputcapacitors. SNVA427B–January2010–RevisedApril2013 AN-2031LMZ120033ADemoBoardSIMPLESWITCHER®PowerModule 5 SubmitDocumentationFeedback QuickStartGuide Copyright©2010–2013,TexasInstrumentsIncorporated

PerformanceCharacteristics www.ti.com 9 Performance Characteristics Efficiency,12VInput@25°C Dissipation,12VInput@25°C 100 2.5 95 90 5.0 2 5.0 3.3 %) 85 2.5 W) 3.3 CY ( 80 1.8 N ( 1.5 2.5 EN 75 1.5 TIO 1.8 CI 1.2 A FFI 70 SIP 1 1.5 E S 65 0.8 DI 1.2 0.8 60 0.5 25° C 55 25° C 50 0 0 0.5 1 1.5 2 2.5 3 0 0.5 1 1.5 2 2.5 3 OUTPUT CURRENT (A) OUTPUT CURRENT(A) LineandLoadRegulation@25°C 1.83 1.825 V) E ( G 1.82 A T 20 OL 5.5 12 1.815 V T 6 U P T 1.81 U O 5 1.805 4.75 25°C 5.25 4.5 1.8 0 0.5 1 1.5 2 2.5 3 OUTPUT CURRENT (A) 6 AN-2031LMZ120033ADemoBoardSIMPLESWITCHER®PowerModule SNVA427B–January2010–RevisedApril2013 QuickStartGuide SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

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