User's Guide SNVA456A–August2010–RevisedApril2013 AN-2084 LMZ1420xEXT / LMZ1200xEXT Evaluation Board 1 Introduction TheLMZ1420xEXTandLMZ1200xEXTSIMPLESWITCHER®powermodulesareeasy-to-useDC-DC solutioncapableofdrivinguptoa3Aloadwithexceptionalpowerconversionefficiency,outputvoltage accuracy,lineandloadregulation.Theyareavailableinaninnovativepackagethatenhancesthermal performanceandallowsforhandormachinesoldering. TheLMZ14203EXT/2EXT/1EXTcanacceptaninputvoltagerailbetween6Vand42Vandthe LMZ12003EXT/2EXT/1EXTcanacceptaninputvoltagerailbetween4.5Vand20V.Thedevicescan deliveranadjustableandhighlyaccurateoutputvoltageaslowas0.8Vandashighas6V.Thecontrol structureisconstanton-timewithinputvoltagefeedforward.Thiscreatesanearlyconstantswitching frequencyacrosstheinputvoltagerange.ThecontrolloopoperateswellwithlowESRoutputcapacitors suchasceramics.Anoutputfeed-forwardcapacitoracrosstheupperfeedbackresistortrimsforoptimum transientresponse.TheprecisionenableinputallowsforprogrammableUVLOoftheinputsupply.The externalsoft-startcapacitorfacilitatescontrolledstartupoutputrisetime.TheLMZ1420xEXTand LMZ1200xEXTfamilyisareliableandrobustsolutionwiththefollowingfeatures:losslesscycle-by-cycle valleycurrentlimittoprotectforovercurrentorshort-circuitfault,thermalshutdown,inputunder-voltage lock-out,andwillstartupintoapre-biasedoutput.TheLMZ1420xEXTandLMZ1200xEXTfamiliesare shockandvibrationcertifiedandratedforoperationdownto–55°C. 2 Board Specifications • LMZ1420xEXTV =6Vto42V IN • LMZ1420xEXTenableUVLO=8V • LMZ1420xEXTV =3.3V OUT • LMZ1200xEXTV =4.5Vto20V IN • LMZ1200xEXTenableUVLO=4.5V • LMZ1200xEXTV =1.8V OUT • Operatesatfullloadupto80°Cambientat12Vinput • θ =20°C/W,θ =1.9°C/W JA JC • Designedonfourlayers,allfourlayersare1oz.copperweight • Thetwointernalgroundplanesareidentical • Measures1.705in.x3.03in.(4.33cmx7.7cm)andis62mil(.062”)thickofFR4laminatematerial ForadditionalcircuitmodificationsrefertotheDesignConsiderationsectionoftheLMZ1420xEXTor LMZ1200xEXTdatasheet.FornegativeoutputvoltageconnectionsseeAN-2027. 3 Additional Footprints AdditionalcomponentmountingpadsareavailabletoexperimentwithalternativeCinandCout combinationsorazenerclampontheenableinput.SeeFigure6forcorrespondingschematiclocations. Alltrademarksarethepropertyoftheirrespectiveowners. SNVA456A–August2010–RevisedApril2013 AN-2084LMZ1420xEXT/LMZ1200xEXTEvaluationBoard 1 SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

AdditionalFootprints www.ti.com U1 EP Enable VIN LMZ1420xEXTTZ UVLO @ 8V 6V to 42V (LMZ1200xEXTTZ) (UVLO @ 4.4V) (4.5V to 20V) T 3.3VOUT @ 3A VIN RON EN GND SS FB VOU (1.8VOUT @ 3A) 1 2 3 4 5 6 7 RENT 68.1 k: CFF (32.4 k:) 0.022 PF RON 61.9 k: (32.4 k:) RFBT 3.32 k: (1.87 k:) RENB C10IN P2F 1C IPNF1 0.022C PSFS RFBB 1C OPF1 1C0O02 PF 11.8 k: 1.07 k: (1.50 k:) Figure1.EvaluationBoardSchematic (LMZ1200xEXT1.8Vapplicationvaluesshowninparentheses) 2 AN-2084LMZ1420xEXT/LMZ1200xEXTEvaluationBoard SNVA456A–August2010–RevisedApril2013 SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

www.ti.com BillofMaterials 4 Bill of Materials Table1. LMZ1420xEXTBillofMaterials,V =8Vto42V,V =3.3V,I =3A/2A/1A IN OUT OUT(MAX) Designator Description CaseSize Manufacturer ManufacturerP/N Quantit y U1 SIMPLESWITCHER® PFM-7 TexasInstruments LMZ14203or 1 LMZ14202or LMZ14201 C ,C 1µF,X7R,50V 1206 TaiyoYuden UMK316B7105KL-T 2 IN4 O1 C 10µF,X5R,50V 1210 TaiyoYuden UMK325BJ106MM-T 1 IN2 C 100µF,X5R,6.3V 1210 TaiyoYuden JMK325BJ107MM-T 1 O2 C ,C 0.022µF,X7R,100V 0805 AVX 08051C223JAT2A 2 SS FF R 11.8k 0805 Panasonic ERJ-6ENF1182V 1 ENB R 68.1kΩ 0805 Panasonic ERJ-6ENF6812V 1 ENT R 3.32kΩ 0805 Vishay-Dale CRCW08053K32FKEA 1 FBT R 1.07kΩ 0805 Panasonic CRCW080534K8FKEA 1 FBB R 61.9kΩ 0805 Panasonic ERJ-6ENF6192V 1 ON Table2. LMZ1200xEXTBillofMaterials,V =4.5to20V,V =1.8V,I =3A/2A/1A IN OUT OUT(MAX) Designator Description CaseSize Manufacturer ManufacturerP/N Quantit y U1 SIMPLESWITCHER® PFM-7 TexasInstruments LMZ12003or 1 LMZ12002or LMZ12001 C ,C 1µF,X7R,50V 1206 TaiyoYuden UMK316B7105KL-T 2 IN4 O1 C 10µF,X5R,50V 1210 TaiyoYuden UMK325BJ106MM-T 1 IN2 C 100µF,X5R,6.3V 1210 TaiyoYuden JMK325BJ107MM-T 1 O2 C ,C 0.022µF,X7R,100V 0805 AVX 08051C223JAT2A 2 SS FF R 11.8k 0805 Panasonic ERJ-6ENF1182V 1 ENB R 32.4KΩ 0805 Panasonic ERJ-6ENF3242V 1 ENT R 1.87kΩ 0805 Vishay-Dale CRCW08051K87FKEA` 1 FBT R 1.50kΩ 0805 Panasonic CRCW08051K50FKEA 1 FBB R 32.4KΩ 0805 Panasonic ERJ-6ENF3242V 1 ON SNVA456A–August2010–RevisedApril2013 AN-2084LMZ1420xEXT/LMZ1200xEXTEvaluationBoard 3 SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

PerformanceCharacteristics www.ti.com 5 Performance Characteristics LMZ14203EXTLoadandLineRegulation LMZ12003EXTLoadandLineRegulation LMZ14203EXTEfficiency LMZ12003EXTEfficiency 100 100 95 95 6 %) 8 %) 5 Y ( 90 12 Y ( 90 C 15 C 6 N N E 20 E CI CI FI 85 FI 85 12 F F E 36 E 80 80 20 25°C VOUT = 3.3V VOUT = 1.8V 25°C 75 75 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) LMZ14202EXTEfficiency LMZ12002EXTEfficiency 4 AN-2084LMZ1420xEXT/LMZ1200xEXTEvaluationBoard SNVA456A–August2010–RevisedApril2013 SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

www.ti.com PerformanceCharacteristics LMZ14201EXTEfficiency LMZ12001EXTEfficiency 100 100 6 90 8 90 5 12 %) 6 %) Y ( 8 Y ( 80 20 NC 80 C 24 E N CI 12 FICIE 70 36 EFFI 70 F E 20 42 60 60 25°C VOUT = 1.8V 25°C VOUT = 3.3V 50 50 0 0.2 0.4 0.6 0.8 1 0 0.2 0.4 0.6 0.8 1 OUTPUT CURRENT (A) OUTPUT CURRENT (A) LMZ14203EXTThermalDerating LMZ12003EXTThermalDerating LMZ14202EXTThermalDerating LMZ12002EXTThermalDerating SNVA456A–August2010–RevisedApril2013 AN-2084LMZ1420xEXT/LMZ1200xEXTEvaluationBoard 5 SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

PerformanceCharacteristics www.ti.com LMZ14201EXTThermalDerating LMZ12001EXTThermalDerating 1.2 1 A) T ( 0.8 4.5 Vin N E R 12 Vin R U 0.6 T C 20 Vin U P 0.4 T U O ˘JA = 19.6°C/W 0.2 VOUT = 1.8V 0 50 60 70 80 90 100 110 120 AMBIENT TEMPERATURE (C) LMZ14203EXTCurrentLimitV =3.3V LMZ12003EXTCurrentLimitV =1.8V OUT OUT LMZ14202EXTCurrentLimitV =3.3V LMZ12002EXTCurrentLimitV =1.8V OUT OUT 6 AN-2084LMZ1420xEXT/LMZ1200xEXTEvaluationBoard SNVA456A–August2010–RevisedApril2013 SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

www.ti.com PerformanceCharacteristics LMZ14201EXTCurrentLimitV =3.3V LMZ12001EXTCurrentLimitV =1.8V OUT OUT 2.4 2.4 2.3 2.3 SHORT CIRCUIT A) 2.2 A) 2.2 SHORT CIRCUIT T ( T ( N N E 2.1 E 2.1 R R R R U ONSET U C 2.0 C 2.0 ONSET 1.9 1.9 25°C 25°C 1.8 1.8 0 10 20 30 40 50 0 5 10 15 20 25 INPUT VOLTAGE (V) INPUT VOLTAGE (V) LMZ14203EXTStartupV =12V LMZ12003EXTStartupV =12V IN IN ENABLE ENABLE VOUT = 3.3V @ 3A VOUT = 1.8V @ 3A 1.00 ms/DIV 1.00 ms/DIV LMZ14203EXTOutputRippleV =3.3V LMZ14203EXTTransientResponseV =24V OUT IN I =3A,BW=200MHz V =3.3V,0.6Ato3AStep OUT OUT SNVA456A–August2010–RevisedApril2013 AN-2084LMZ1420xEXT/LMZ1200xEXTEvaluationBoard 7 SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

PCBLayoutDiagrams www.ti.com 6 PCB Layout Diagrams GerberandCADfilescanbedownloadfromtheLMZ14203EXTproductfolder. Figure2.TopLayer Figure3.InternalLayerI(Ground) HeatSinkingLayer Figure4.InternalLayerII(Ground) HeatSinkingLayer 8 AN-2084LMZ1420xEXT/LMZ1200xEXTEvaluationBoard SNVA456A–August2010–RevisedApril2013 SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

www.ti.com PCBLayoutDiagrams Figure5.BottomLayer(GroundandRouting) HeatSinkingLayer Figure6.LMZ14203EXTPCBCADpackageschematic DNS=Componentnotinstalled SNVA456A–August2010–RevisedApril2013 AN-2084LMZ1420xEXT/LMZ1200xEXTEvaluationBoard 9 SubmitDocumentationFeedback Copyright©2010–2013,TexasInstrumentsIncorporated

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