Product Sample & Technical Tools & Support & Folder Buy Documents Software Community LM2940-N,LM2940C SNVS769J–MARCH2000–REVISEDDECEMBER2014 LM2940x 1-A Low Dropout Regulator 1 Features 3 Description • InputVoltageRange=6Vto26V The LM2940-N and LM2940C positive voltage 1 regulators feature the ability to source 1 A of output • DropoutVoltageTypically0.5VatI =1A OUT current with a dropout voltage of typically 0.5 V and a • OutputCurrentinExcessof1A maximum of 1 V over the entire temperature range. • OutputVoltageTrimmedBeforeAssembly Furthermore, a quiescent current reduction circuit has been included which reduces the ground current • ReverseBatteryProtection when the differential between the input voltage and • InternalShortCircuitCurrentLimit the output voltage exceeds approximately 3 V. The • MirrorImageInsertionProtection quiescent current with 1 A of output current and an • P+ProductEnhancementTested input-output differential of 5 V is therefore only 30 mA. Higher quiescent currents only exist when the regulatorisinthedropoutmode(V −V ≤ 3V). 2 Applications IN OUT Designed also for vehicular applications, the LM2940- • PostRegulatorforSwitchingSupplies N and LM2940C and all regulated circuitry are • LogicPowerSupplies protected from reverse battery installations or 2- • IndustrialInstrumentation battery jumps. During line transients, such as load dump when the input voltage can momentarily space exceed the specified maximum operating voltage, the space regulator will automatically shut down to protect both space the internal circuits and the load. The LM2940-N and LM2940C cannot be harmed by temporary mirror- image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided. DeviceInformation(1) PARTNUMBER PACKAGE BODYSIZE(NOM) SOT-223(4) 6.50mmx3.50mm WSON(8) 4.00mmx4.00mm LM2940-N TO-263(3) 10.18mmx8.41mm TO-220(3) 14.986mmx10.16mm TO-263(3) 10.18mmx8.41mm LM2940C TO-220(3) 14.986mmx10.16mm (1) For all available packages, see the orderable addendum at theendofthedatasheet. SimplifiedSchematic V V IN IN LM2940 OUT OUT Unregulated Input Regulated Output + C1* COUT** 0.47 µF 22 µF I Q *Requiredifregulatorislocatedfarfrompowersupplyfilter. **C mustbeatleast22μFtomaintainstability.Maybeincreasedwithoutboundtomaintainregulationduring OUT transients.Locateascloseaspossibletotheregulator.Thiscapacitormustberatedoverthesameoperating temperaturerangeastheregulatorandtheESRiscritical;seecurve. 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LM2940-N,LM2940C SNVS769J–MARCH2000–REVISEDDECEMBER2014 www.ti.com Table of Contents 1 Features.................................................................. 1 7.3 FeatureDescription.................................................13 2 Applications........................................................... 1 7.4 DeviceFunctionalModes........................................14 3 Description............................................................. 1 8 ApplicationandImplementation........................ 15 4 RevisionHistory..................................................... 2 8.1 ApplicationInformation............................................15 8.2 TypicalApplication..................................................15 5 PinConfigurationandFunctions......................... 3 9 PowerSupplyRecommendations...................... 17 6 Specifications......................................................... 4 10 Layout................................................................... 17 6.1 AbsoluteMaximumRatings......................................4 6.2 ESDRatings..............................................................4 10.1 LayoutGuidelines.................................................17 6.3 RecommendedOperatingConditions.......................4 10.2 LayoutExamples...................................................17 6.4 ThermalInformation..................................................5 10.3 Heatsinking...........................................................18 6.5 ElectricalCharacteristics(5Vand8V)....................5 11 DeviceandDocumentationSupport................. 20 6.6 ElectricalCharacteristics(9Vand10V)..................6 11.1 DocumentationSupport........................................20 6.7 ElectricalCharacteristics(12Vand15V)................7 11.2 RelatedLinks........................................................20 6.8 TypicalCharacteristics..............................................8 11.3 Trademarks...........................................................20 7 DetailedDescription............................................ 13 11.4 ElectrostaticDischargeCaution............................20 7.1 Overview.................................................................13 11.5 Glossary................................................................20 7.2 FunctionalBlockDiagram.......................................13 12 Mechanical,Packaging,andOrderable Information........................................................... 20 4 Revision History NOTE:Pagenumbersforpreviousrevisionsmaydifferfrompagenumbersinthecurrentversion. ChangesfromRevisionI(April2013)toRevisionJ Page • AddedPinConfigurationandFunctionssection,ESDRatingtable,FeatureDescriptionsection,DeviceFunctional Modes,ApplicationandImplementationsection,PowerSupplyRecommendationssection,Layoutsection,Device andDocumentationSupportsection,andMechanical,Packaging,andOrderableInformationsection .............................. 1 • Deletedinformationre:obsoleteCDIPandCLGApackageoptions;ChangepinnamesfromVin,VouttoIN,OUT; deleteHeatsinkingsectionsre:packagesapartfromTO-220............................................................................................... 1 • ChangedsymbolsforThermalInformation ......................................................................................................................... 19 ChangesfromRevisionH(April2013)toRevisionI Page 2 SubmitDocumentationFeedback Copyright©2000–2014,TexasInstrumentsIncorporated ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C www.ti.com SNVS769J–MARCH2000–REVISEDDECEMBER2014 5 Pin Configuration and Functions DDPAK/TO-263(KTT)Package DDPAK/TO-263(KTT)Package 3Pins SideView TopView WSON(NGN)Package 8Pins TopView TO-220(NDE)Package 4Pins N/C 1 8 N/C FrontView GND 2 7 GND GND IN 3 6 OUT N/C 4 5 OUT SOT-223(DCY)Package 3Pins FrontView Pin2andpin7arefusedtocenterDAP Pin5and6needtobetiedtogetheron PCBboard PinFunctions PIN I/O DESCRIPTION NAME NDE KTT DCY NGN IN 1 1 1 3 I Unregulatedinputvoltage. GND 2 2 2 2 — Ground Regulatedoutputvoltage.Thispinrequiresanoutputcapacitorto OUT 3 3 3 5,6 O maintainstability.SeeDetailedDesignProcedureforoutput capacitordetails. GND 4 4 4 7 — Ground N/C — — — 1,4,8 — Noconnection Copyright©2000–2014,TexasInstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C SNVS769J–MARCH2000–REVISEDDECEMBER2014 www.ti.com 6 Specifications 6.1 Absolute Maximum Ratings(1)(2) MIN MAX UNIT LM2940-NKTT,NDE,DCY≤100ms 60 V LM2940CKTT,NDE≤1ms 45 Internalpowerdissipation(3) Internally Limited Maximumjunctiontemperature 150 TO-220(NDE),Wave(10s) 260 Soldering DDPAK/TO-263(KTT)(30s) 235 temperature(4) °C SOT-223(DCY)(30s) 260 WSON-8(NGN)(30s) 235 Storagetemperature,T −65 150 stg (1) AbsoluteMaximumRatingsarelimitsbeyondwhichdamagetothedevicemayoccur.RecommendedOperatingConditionsare conditionsunderwhichthedevicefunctionsbutthespecificationsmightnotbeensured.Forensuredspecificationsandtestconditions seetheElectricalCharacteristics(5Vand8V). (2) IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTexasInstrumentsSalesOffice/Distributorsforavailabilityand specifications. (3) Themaximumallowablepowerdissipationisafunctionofthemaximumjunctiontemperature,T,thejunction-to-ambientthermal J resistance,R ,andtheambienttemperature,T .Exceedingthemaximumallowablepowerdissipationwillcauseexcessivedie θJA A temperature,andtheregulatorwillgointothermalshutdown.ThevalueofR (fordevicesinstillairwithnoheatsink)is23.3°C/Wfor θJA theTO-220package,40.9°C/WfortheDDPAK/TO-263package,and59.3°C/WfortheSOT-223package.TheeffectivevalueofR θJA canbereducedbyusingaheatsink(seeHeatsinkingforspecificinformationonheatsinking).ThevalueofR fortheWSONpackage θJA isspecificallydependentonPCBtracearea,tracematerial,andthenumberoflayersandthermalvias.Forimprovedthermalresistance andpowerdissipationfortheWSONpackage,refertoApplicationNoteAN-1187LeadlessLeadframePackage(LLP)(SNOA401).Itis recommendedthat6viasbeplacedunderthecenterpadtoimprovethermalperformance. (4) RefertoJEDECJ-STD-020Cforsurfacemountdevice(SMD)packagereflowprofilesandconditions.Unlessotherwisestated,the temperatureandtimeareforSn-Pb(STD)only. 6.2 ESD Ratings VALUE UNIT V Electrostaticdischarge Human-bodymodel(HBM),perANSI/ESDA/JEDECJS-001(1) ±2000 V (ESD) (1) JEDECdocumentJEP155statesthat500-VHBMallowssafemanufacturingwithastandardESDcontrolprocess. 6.3 Recommended Operating Conditions overoperatingfree-airtemperaturerange(unlessotherwisenoted) MIN MAX UNIT Inputvoltage 6 26 V LM2940-NNDE,LM2940-NKTT −40 125 Temperature LM2940CNDE,LM2940CKTT 0 125 °C LM2940-NDCY −40 85 LM2940-NNGN −40 125 4 SubmitDocumentationFeedback Copyright©2000–2014,TexasInstrumentsIncorporated ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C www.ti.com SNVS769J–MARCH2000–REVISEDDECEMBER2014 6.4 Thermal Information LM2940-N,LM2940C LM2940-N THERMALMETRIC(1) TO-220 DDPAK/TO-263 SOT-223 WSON UNIT (NDE) (KTT) (DCY) (NGN) 3PINS 3PINS 4PINS 8PINS R Junction-to-ambientthermalresistance(2) 23.3 40.9 59.3 40.5 θJA R Junction-to-case(top)thermalresistance 16.1 43.5 38.9 26.2 θJC(top) R Junction-to-boardthermalresistance 4.8 23.5 8.1 17.0 θJB °C/W ψ Junction-to-topcharacterizationparameter 2.7 10.3 1.7 0.2 JT ψ Junction-to-boardcharacterizationparameter 4.8 22.5 8.0 17.2 JB R Junction-to-case(bottom)thermalresistance 1.1 0.8 n/a 3.2 θJC(bot) (1) Formoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,SPRA953. (2) ThermalinformationfortheTO-220packageisforapackageverticallymountedwithaheatsinkinthemiddleofaPCBwhichis complianttotheJEDECHIGH-K2s2p(JESD51-7).Theheatsink-to-ambientthermalresistance,R ,is21.7°C/W.SeeHeatsinking ƟSA TO-220PackagePartsformoreinformation. 6.5 Electrical Characteristics (5 V and 8 V) Unlessotherwisespecified:V =V +5V,I =1AandC =22µF.MIN(minimum)andMAX(maximum)limitsapply IN OUT OUT OUT overtherecommendedoperatingtemperaturerange,unlessotherwisenoted;typicallimitsapplyforT =T =25°C. A J 5V 8V PARAMETER TESTCONDITIONS UNIT MIN TYP MAX MIN TYP MAX Inputvoltage 5mA≤I ≤1A 6.25 26 9.4 26 OUT 5mA≤I ≤1A 4.75 5 5.25 7.6 8 8.4 V OUT Outputvoltage 5mA≤I ≤1A,T =25°C 4.85 5 5.15 7.76 8 8.24 OUT J V +2V≤V ≤26V,I =5mA Lineregulation OUT IN OUT 20 50 20 80 mV T =25°C J 50mA≤I ≤1A LM2940-N 35 80 55 130 OUT Loadregulation 50mA≤I ≤1A LM2940-N 35 50 55 80 mV OUT TJ=25°C LM2940C 35 50 55 80 Output 100mADC,20mArms,ƒ =120Hz OUT 35 55 mΩ impedance V +2V≤V ≤26V, LM2940-N OUT IN 10 20 10 20 I =5mA OUT V +2V≤V ≤26V, LM2940-N 10 15 10 15 OUT IN I =5mA OUT Quiescentcurrent T =25°C LM2940C 10 15 mA J V =V +5V,I =1A 30 60 30 60 IN OUT OUT V =V +5V,I =1A IN OUT OUT 30 45 30 45 T =25°C J Outputnoise 10Hzto100kHz,I =5mA 150 240 µVrms voltage OUT ƒ =120Hz,1V ,I = LM2940-N 54 72 48 66 OUT rms OUT 100mA Ripplerejection ƒ =120Hz,1V ,I = LM2940-N 60 72 54 66 dB OUT rms OUT 100mA T =25°C LM2940C 60 72 54 66 J Long-term mV/1000 20 32 stability Hr I =1A 0.5 1 0.5 1 OUT V I =1A,T =25°C 0.5 0.8 0.5 0.8 OUT J Dropoutvoltage I =100mA 110 200 110 200 OUT mV I =100mA,T =25°C 110 150 110 150 OUT J Copyright©2000–2014,TexasInstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C SNVS769J–MARCH2000–REVISEDDECEMBER2014 www.ti.com Electrical Characteristics (5 V and 8 V) (continued) Unlessotherwisespecified:V =V +5V,I =1AandC =22µF.MIN(minimum)andMAX(maximum)limitsapply IN OUT OUT OUT overtherecommendedoperatingtemperaturerange,unlessotherwisenoted;typicallimitsapplyforT =T =25°C. A J 5V 8V PARAMETER TESTCONDITIONS UNIT MIN TYP MAX MIN TYP MAX Short-circuit See(1),T =25°C 1.6 1.9 1.6 1.9 A current J R =100Ω,T≤100ms LM2940-N 60 75 60 75 OUT Maximumline transient ROUT=100Ω,T≤1ms LM2940C 45 55 45 555 V T =25°C J R =100Ω LM2940-N –15 –30 –15 –30 OUT Reversepolarity DCinputvoltage ROUT=100Ω LM2940C –15 –30 –15 –30 V T =25°C J Reversepolarity R =100Ω,T≤100ms LM2940-N –50 –75 –50 –75 OUT TransientInput V Voltage ROUT=100Ω,T≤1ms LM2940C –45 –55 (1) Outputcurrentwilldecreasewithincreasingtemperaturebutwillnotdropbelow1Aatthemaximumspecifiedtemperature. 6.6 Electrical Characteristics (9 V and 10 V) Unlessotherwisespecified:V =V +5V,I =1AandC =22µF.MIN(minimum)andMAX(maximum)limitsapply IN OUT OUT OUT overtherecommendedoperatingtemperaturerange,unlessotherwisenoted;typicallimitsapplyforT =T =25°C. A J 9V 10V PARAMETER TESTCONDITIONS UNIT MIN TYP MAX MIN TYP MAX Inputvoltage 5mA≤I ≤1A 10.5 26 11.5 26 OUT 5mA≤I ≤1A 8.55 9 9.45 9.5 10 10.5 V OUT Outputvoltage 5mA≤I ≤1A,T =25°C 8.73 9 9.27 9.7 10 10.3 OUT J V +2V≤V ≤26V,I =5mA Lineregulation OUT IN OUT 20 90 20 100 mV T =25°C J 50mA≤I ≤1A LM2940-N 60 150 65 165 OUT Loadregulation 50mA≤I ≤1A LM2940-N 60 90 65 100 mV OUT T =25°C J LM2940C 60 90 Output 100mADC,20mArms,ƒ =120Hz OUT 60 65 mΩ impedance V +2V≤V ≤26V, LM2940-N OUT IN 10 20 10 20 I =5mA OUT V +2V≤V ≤26V, LM2940-N 10 15 15 OUT IN I =5mA OUT Quiescentcurrent T =25°C LM2940C 10 15 mA J V =V +5V,I =1A 30 60 30 60 IN OUT OUT V =V +5V,I =1A IN OUT OUT 30 45 30 45 T =25°C J Outputnoise 10Hzto100kHz,I =5mA OUT 270 300 µVrms voltage ƒ =120Hz,1V OUT rms LM2940-N 46 64 45 63 I =100mA OUT Ripplerejection ƒ =120Hz,1V LM2940-N 52 64 51 63 dB OUT rms I =100mA OUT T =25°C LM2940C 52 64 J Long-term mV/1000 34 36 stability Hr I =1A 0.5 1 0.5 1 OUT V I =1A,T =25°C 0.5 0.8 0.5 0.8 OUT J Dropoutvoltage I =100mA 110 200 110 200 OUT mV I =100mA,T =25°C 110 150 110 150 OUT J 6 SubmitDocumentationFeedback Copyright©2000–2014,TexasInstrumentsIncorporated ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C www.ti.com SNVS769J–MARCH2000–REVISEDDECEMBER2014 Electrical Characteristics (9 V and 10 V) (continued) Unlessotherwisespecified:V =V +5V,I =1AandC =22µF.MIN(minimum)andMAX(maximum)limitsapply IN OUT OUT OUT overtherecommendedoperatingtemperaturerange,unlessotherwisenoted;typicallimitsapplyforT =T =25°C. A J 9V 10V PARAMETER TESTCONDITIONS UNIT MIN TYP MAX MIN TYP MAX Short-circuit See(1),T =25°C 1.6 1.9 1.6 1.9 A current J R =100Ω,T≤100ms LM2940-N 60 75 60 75 OUT Maximumline transient ROUT=100Ω,T≤100ms LM2940C 45 55 V T =25°C J R =100Ω LM2940-N –15 –30 –15 –30 OUT Reversepolarity DCinputvoltage ROUT=100Ω LM2940C –15 –30 V T =25°C J Reversepolarity LM2940-N –50 –75 –50 –75 TransientInput R =100Ω,T≤100ms V OUT Voltage LM2940C –45 –55 (1) Outputcurrentwilldecreasewithincreasingtemperaturebutwillnotdropbelow1Aatthemaximumspecifiedtemperature. 6.7 Electrical Characteristics (12 V and 15 V) Unlessotherwisespecified:V =V +5V,I =1AandC =22µF.MIN(minimum)andMAX(maximum)limitsapply IN OUT OUT OUT overtherecommendedoperatingtemperaturerange,unlessotherwisenoted;typicallimitsapplyforT =T =25°C. A J 12V 15V PARAMETER TESTCONDITIONS UNIT MIN TYP MAX MIN TYP MAX Inputvoltage 5mA≤I ≤1A 13.6 26 16.75 26 OUT 5mA≤I ≤1A 11.40 12 12.6 14.25 15 15.75 V OUT Outputvoltage 5mA≤I ≤1A,T =25°C 11.64 12 12.36 14.55 15 15.45 OUT J V +2V≤V ≤26V,I =5mA Lineregulation OUT IN OUT 20 120 20 150 mV T =25°C J 50mA≤I ≤1A LM2940-N 55 200 OUT Loadregulation 50mA≤I ≤1A LM2940-N 55 120 mV OUT T =25°C J LM2940C 55 120 70 150 Output 100mADC,20mArms,ƒ =120Hz OUT 80 100 mΩ impedance V +2V≤V ≤26V, LM2940-N OUT IN 10 20 I =5mA OUT V +2V≤V ≤26V, LM2940-N 10 15 OUT IN I =5mA OUT Quiescentcurrent T =25°C LM2940C 10 15 10 15 mA J V =V +5V,I =1A 30 60 30 60 IN OUT OUT V =V +5V,I =1A IN OUT OUT 30 45 30 45 T =25°C J Outputnoise 10Hzto100kHz,I =5mA OUT 360 450 µVrms voltage ƒ =120Hz,1V ,I = LM2940-N 48 66 OUT rms OUT 100mA Ripplerejection ƒ =120Hz,1V ,I = LM2940-N 54 66 dB OUT rms OUT 100mA T =25°C LM2940C 54 66 52 64 J Long-term mV/1000 48 60 stability Hr I =1A 0.5 1 0.5 1 OUT V I =1A,T =25°C 0.5 0.8 0.5 0.8 OUT J Dropoutvoltage I =100mA 110 200 110 200 OUT mV I =100mA,T =25°C 110 150 110 150 OUT J Copyright©2000–2014,TexasInstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C SNVS769J–MARCH2000–REVISEDDECEMBER2014 www.ti.com Electrical Characteristics (12 V and 15 V) (continued) Unlessotherwisespecified:V =V +5V,I =1AandC =22µF.MIN(minimum)andMAX(maximum)limitsapply IN OUT OUT OUT overtherecommendedoperatingtemperaturerange,unlessotherwisenoted;typicallimitsapplyforT =T =25°C. A J 12V 15V PARAMETER TESTCONDITIONS UNIT MIN TYP MAX MIN TYP MAX Short-circuit See(1),T =25°C 1.6 1.9 1.6 1.9 A current J R =100Ω,T≤100ms LM2940-N 60 75 OUT Maximumline transient ROUT=100Ω,T≤100ms LM2940C 45 55 45 55 V T =25°C J R =100Ω LM2940-N –15 –30 OUT Reversepolarity DCinputvoltage ROUT=100Ω LM2940C –15 –30 –15 –30 V T =25°C J Reversepolarity R =100Ω,T≤100ms LM2940-N –50 –75 OUT transientinput V voltage ROUT=100Ω,T≤1ms LM2940C –45 –55 –45 –55 (1) Outputcurrentwilldecreasewithincreasingtemperaturebutwillnotdropbelow1Aatthemaximumspecifiedtemperature. 6.8 Typical Characteristics Figure1.DropoutVoltage Figure2.DropoutVoltagevs.Temperature Figure3.OutputVoltagevs.Temperature Figure4.QuiescentCurrentvs.Temperature 8 SubmitDocumentationFeedback Copyright©2000–2014,TexasInstrumentsIncorporated ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C www.ti.com SNVS769J–MARCH2000–REVISEDDECEMBER2014 Typical Characteristics (continued) Figure5.QuiescentCurrent Figure6.QuiescentCurrent Figure7.LineTransientResponse Figure8.LoadTransientResponse Figure9.RippleRejection Figure10.LowVoltageBehavior Copyright©2000–2014,TexasInstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C SNVS769J–MARCH2000–REVISEDDECEMBER2014 www.ti.com Typical Characteristics (continued) Figure11.LowVoltageBehavior Figure12.LowVoltageBehavior Figure13.LowVoltageBehavior Figure14.LowVoltageBehavior Figure15.OutputatVoltageExtremes Figure16.OutputatVoltageExtremes 10 SubmitDocumentationFeedback Copyright©2000–2014,TexasInstrumentsIncorporated ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C www.ti.com SNVS769J–MARCH2000–REVISEDDECEMBER2014 Typical Characteristics (continued) Figure17.OutputatVoltageExtremes Figure18.OutputatVoltageExtremes Figure19.OutputatVoltageExtremes Figure20.OutputCapacitorESR Figure21.PeakOutputCurrent Figure22.OutputImpedance Copyright©2000–2014,TexasInstrumentsIncorporated SubmitDocumentationFeedback 11 ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C SNVS769J–MARCH2000–REVISEDDECEMBER2014 www.ti.com Typical Characteristics (continued) Figure23.MaximumPowerDissipation(TO-220) Figure24.MaximumPowerDissipation(SOT-223) Figure25.MaximumPowerDissipation(DDPAK/TO-263) 12 SubmitDocumentationFeedback Copyright©2000–2014,TexasInstrumentsIncorporated ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C www.ti.com SNVS769J–MARCH2000–REVISEDDECEMBER2014 7 Detailed Description 7.1 Overview The LM2940 positive voltage regulator features the ability to source 1 A of output current with a dropout voltage of typically 0.5 V and a maximum of 1 V over the entire temperature range. Furthermore, a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input voltage and the output voltage exceeds approximately 3 V. The quiescent current with 1 A of output current and aninput-outputdifferentialof5Visthereforeonly30mA.Higherquiescentcurrentsonlyexistwhentheregulator isinthedropoutmode(V –V ≤ 3V). IN OUT 7.2 Functional Block Diagram IN OUT PNP OVSD Current Thermal (§(cid:3)30 V) Limit Shutdown + Bandgap Reference GND 7.3 Feature Description 7.3.1 Short-CircuitCurrentLimit TheinternalcurrentlimitcircuitisusedtoprotecttheLDOagainsthigh-loadcurrentfaultsorshortingevents.The LDO is not designed to operate in a steady-state current limit. During a current-limit event, the LDO sources constant current. Therefore, the output voltage falls when load impedance decreases. Note, also, that if a current limit occurs and the resulting output voltage is low, excessive power may be dissipated across the LDO, resulting athermalshutdownoftheoutput. 7.3.2 OvervoltageShutdown(OVSD) Input voltage greater than typically 30 V will cause the LM2940 output to be disabled. When operating with the input voltage greater than the maximum recommended input voltage of 26 V, the device performance is not ensured. Continuous operation with the input voltage greater than the maximum recommended input voltage is discouraged. 7.3.3 ThermalShutdown(TSD) The LM2940 contains the thermal shutdown circuitry to turn off the output when excessive heat is dissipated in the LDO. The internal protection circuitry of the LM2940 is designed to protect against thermal overload conditions. The TSD circuitry is not intended to replace proper heat sinking. Continuously running the device into thermal shutdown degrades its reliability as the junction temperature will be exceeding the absolute maximum junctiontemperaturerating. Copyright©2000–2014,TexasInstrumentsIncorporated SubmitDocumentationFeedback 13 ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C SNVS769J–MARCH2000–REVISEDDECEMBER2014 www.ti.com 7.4 Device Functional Modes 7.4.1 OperationwithEnableControl The LM2940 design does not include any undervoltage lockout (UVLO), or enable functions. Generally, the output voltage will track the input voltage until the input voltage is greater than V + 1V. When the input OUT voltage is greater than V + 1 V, the LM2940 will be in linear operation, and the output voltage will be OUT regulated. However, the device will be sensitive to any small perturbation of the input voltage. Device dynamic performanceisimprovedwhentheinputvoltageisatleast2Vgreaterthantheoutputvoltage. 14 SubmitDocumentationFeedback Copyright©2000–2014,TexasInstrumentsIncorporated ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C www.ti.com SNVS769J–MARCH2000–REVISEDDECEMBER2014 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validateandtesttheirdesignimplementationtoconfirmsystemfunctionality. 8.1 Application Information The LM2940-N and LM2940C positive voltage regulators feature the ability to source 1 A of output current with a dropoutvoltageoftypically0.5Vandamaximumof1Vovertheentiretemperaturerange.Theoutputcapacitor, C , must have a capacitance value of at least 22 µF with an ESR of at least 100 mΩ, but no more than 1 Ω. OUT The minimum capacitance value and the ESR requirements apply across the entire expected operating ambient temperaturerange. 8.2 Typical Application V V IN IN LM2940 OUT OUT Unregulated Input Regulated Output + C1* COUT** 0.47 µF 22 µF I Q *Requiredifregulatorislocatedfarfrompowersupplyfilter. **C mustbeatleast22μFtomaintainstability.Maybeincreasedwithoutboundtomaintainregulationduring OUT transients.Locateascloseaspossibletotheregulator.Thiscapacitormustberatedoverthesameoperating temperaturerangeastheregulatorandtheESRiscritical;seecurve. Figure26. TypicalApplication 8.2.1 DesignRequirements Table1.DesignParameters DESIGNPARAMETER EXAMPLEVALUE Inputvoltagerange 6Vto26V Outputvoltagerange 8V Outputcurrentrange 5mAto1A Inputcapacitorvalue 0.47µF Outputcapacitorvalue 22µFminimum OutputcapacitorESRrange 100mΩto1Ω 8.2.2 DetailedDesignProcedure 8.2.2.1 ExternalCapacitors The output capacitor is critical to maintaining regulator stability, and must meet the required conditions for both equivalentseriesresistance(ESR)andminimumamountofcapacitance. 8.2.2.1.1 MinimumCapacitance The minimum output capacitance required to maintain stability is 22 μF (this value may be increased without limit).Largervaluesofoutputcapacitancewillgiveimprovedtransientresponse. Copyright©2000–2014,TexasInstrumentsIncorporated SubmitDocumentationFeedback 15 ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C SNVS769J–MARCH2000–REVISEDDECEMBER2014 www.ti.com 8.2.2.1.2 ESRLimits The ESR of the output capacitor will cause loop instability if it is too high or too low. The acceptable range of ESR plotted versus load current is shown in the graph below. It is essential that the output capacitor meet these requirements,oroscillationscanresult. Figure27. OutputCapacitorESRLimits Itisimportanttonotethatformostcapacitors,ESRisspecifiedonlyatroomtemperature.However,thedesigner must ensure that the ESR will stay inside the limits shown over the entire operating temperature range for the design. Foraluminumelectrolyticcapacitors,ESRwillincreasebyabout30Xasthetemperatureisreducedfrom25°Cto −40°C.Thistypeofcapacitorisnotwell-suitedforlowtemperatureoperation. Solid tantalum capacitors have a more stable ESR over temperature, but are more expensive than aluminum electrolytics. A cost-effective approach sometimes used is to parallel an aluminum electrolytic with a solid tantalum,withthetotalcapacitancesplitabout75/25%withthealuminumbeingthelargervalue. If two capacitors are paralleled, the effective ESR is the parallel of the two individual values. The flatter ESR of thetantalumwillkeeptheeffectiveESRfromrisingasquicklyatlowtemperatures. 8.2.3 ApplicationCurves Figure28.LowVoltageBehavior Figure29.OutputatVoltageExtremes 16 SubmitDocumentationFeedback Copyright©2000–2014,TexasInstrumentsIncorporated ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C www.ti.com SNVS769J–MARCH2000–REVISEDDECEMBER2014 9 Power Supply Recommendations The device is designed to operate from an input voltage supply range between V + 1 V up to a maximum of OUT 26 V. This input supply must be well regulated and free of spurious noise. To ensure that the LM2940 output voltageiswellregulated,theinputsupplyshouldbeatleastV +2V. OUT 10 Layout 10.1 Layout Guidelines The dynamic performance of the LM2940 is dependent on the layout of the PCB. PCB layout practices that are adequate for typical LDOs may degrade the PSRR, noise, or transient performance of the LM2940. Best performance is achieved by placing C and C on the same side of the PCB as the LM2940, and as close as IN OUT is practical to the package. The ground connections for C and C should be back to the LM2940 ground pin IN OUT usingaswideandshortofacoppertraceasispractical. 10.2 Layout Examples Ground 1 5 2 6 CIN GND COUT VIN 3 7 4 8 VOUT Figure30. LM2940WSONLayout 4 CIN COUT 1 2 3 VIN VOUT Ground Figure31. LM2940SOT-223Layout 4 CIN COUT 1 2 3 VIN VOUT Ground Figure32. TO-263Layout Copyright©2000–2014,TexasInstrumentsIncorporated SubmitDocumentationFeedback 17 ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C SNVS769J–MARCH2000–REVISEDDECEMBER2014 www.ti.com 10.3 Heatsinking Aheatsinkmayberequireddependingonthemaximumpowerdissipationandmaximumambienttemperatureof the application. Under all possible operating conditions, the junction temperature must be within the range specifiedunderAbsoluteMaximumRatings(1)(2). Todetermineifaheatsinkisrequired,thepowerdissipatedbytheregulator,P ,mustbecalculated. D Figure 33 shows the voltages and currents which are present in the circuit, as well as the formula for calculating thepowerdissipatedintheregulator: I =I +I IN L G P =(V −V )I +(V )I D IN OUT L IN G Figure33. PowerDissipationDiagram The next parameter which must be calculated is the maximum allowable temperature rise, T . This is R(MAX) calculatedbyusingtheformula: T =T −T R(MAX) J(MAX) A(MAX) where • T isthemaximumallowablejunctiontemperature,whichis125°Cforcommercialgradeparts. J(MAX) • T isthemaximumambienttemperaturewhichwillbeencounteredintheapplication. (1) A(MAX) Using the calculated values for T and P , the maximum allowable value for the junction-to-ambient thermal R(MAX) D resistance,R ,cannowbefound: θJA R =T /P (2) θJA R(MAX) D NOTE If the maximum allowable value for R is found to be ≥ 23.3°C/W for the TO-220 θJA package (with a heatsink of 21.7°C/W R ), ≥ 40.9°C/W for the DDPAK/TO-263 package, θSA or ≥ 59.3°C/W for the SOT-223 package, no heatsink is needed since the package alone willdissipateenoughheattosatisfytheserequirements. IfthecalculatedvalueforR fallsbelowtheselimits,aheatsinkisrequired. θJA (1) AbsoluteMaximumRatingsarelimitsbeyondwhichdamagetothedevicemayoccur.RecommendedOperatingConditionsare conditionsunderwhichthedevicefunctionsbutthespecificationsmightnotbeensured.Forensuredspecificationsandtestconditions seetheElectricalCharacteristics(5Vand8V). (2) IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTexasInstrumentsSalesOffice/Distributorsforavailabilityand specifications. 18 SubmitDocumentationFeedback Copyright©2000–2014,TexasInstrumentsIncorporated ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C www.ti.com SNVS769J–MARCH2000–REVISEDDECEMBER2014 Heatsinking (continued) 10.3.1 HeatsinkingTO-220PackageParts TheTO-220canbeattachedtoatypicalheatsink,orsecuredtoacopperplaneonaPCboard. If a manufactured heatsink is to be selected, the value of heatsink-to-ambient thermal resistance, R , must first θSA becalculated: R =R −R −R θSA θJA θCS θJC where • R isdefinedasthethermalresistancefromthejunctiontothesurfaceofthecase.Avalueof3°C/Wcanbe θJC assumedforR forthiscalculation. θJC • R isdefinedasthethermalresistancebetweenthecaseandthesurfaceoftheheatsink.ThevalueofR θCS θCS willvaryfromabout0.5°C/Wtoabout2.5°C/W(dependingonmethodofattachment,insulator,etc.).Ifthe exactvalueisunknown,2°C/WshouldbeassumedforR . (3) θCS When a value for R is found using Equation 3, a heatsink must be selected that has a value that is less than θSA orequaltothisnumber. R is specified numerically by the heatsink manufacturer in the catalog, or shown in a curve that plots θSA temperaturerisevspowerdissipationfortheheatsink. Copyright©2000–2014,TexasInstrumentsIncorporated SubmitDocumentationFeedback 19 ProductFolderLinks:LM2940-N LM2940C

LM2940-N,LM2940C SNVS769J–MARCH2000–REVISEDDECEMBER2014 www.ti.com 11 Device and Documentation Support 11.1 Documentation Support 11.1.1 RelatedDocumentation Forrelateddocumentationseethefollowing: • ApplicationNoteAN-1028MaximumPowerEnhancementTechniquesforPowerPackages(SNVA036). • ApplicationNoteAN-1187LeadlessLeadframePackage(LLP)(SNOA401). 11.2 Related Links The table below lists quick access links. Categories include technical documents, support and community resources,toolsandsoftware,andquickaccesstosampleorbuy. Table2.RelatedLinks TECHNICAL TOOLS& SUPPORT& PARTS PRODUCTFOLDER SAMPLE&BUY DOCUMENTS SOFTWARE COMMUNITY LM2940-N Clickhere Clickhere Clickhere Clickhere Clickhere LM2940C Clickhere Clickhere Clickhere Clickhere Clickhere 11.3 Trademarks Alltrademarksarethepropertyoftheirrespectiveowners. 11.4 Electrostatic Discharge Caution Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates. 11.5 Glossary SLYZ022—TIGlossary. Thisglossarylistsandexplainsterms,acronyms,anddefinitions. 12 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of thisdocument.Forbrowser-basedversionsofthisdatasheet,refertotheleft-handnavigation. 20 SubmitDocumentationFeedback Copyright©2000–2014,TexasInstrumentsIncorporated ProductFolderLinks:LM2940-N LM2940C

PACKAGE OPTION ADDENDUM www.ti.com 9-Jun-2020 PACKAGING INFORMATION Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking Samples (1) Drawing Qty (2) (6) (3) (4/5) LM2940CS-12 NRND DDPAK/ KTT 3 45 TBD Call TI Call TI 0 to 125 LM2940CS TO-263 -12 P+ LM2940CS-12/NOPB ACTIVE DDPAK/ KTT 3 45 Green (RoHS SN Level-3-245C-168 HR 0 to 125 LM2940CS TO-263 & no Sb/Br) -12 P+ LM2940CS-15 NRND DDPAK/ KTT 3 45 TBD Call TI Call TI 0 to 125 LM2940CS TO-263 -15 P+ LM2940CS-15/NOPB ACTIVE DDPAK/ KTT 3 45 Green (RoHS SN Level-3-245C-168 HR 0 to 125 LM2940CS TO-263 & no Sb/Br) -15 P+ LM2940CS-5.0 NRND DDPAK/ KTT 3 45 TBD Call TI Call TI 0 to 125 LM2940CS TO-263 -5.0 P+ LM2940CS-5.0/NOPB ACTIVE DDPAK/ KTT 3 45 Green (RoHS SN Level-3-245C-168 HR 0 to 125 LM2940CS TO-263 & no Sb/Br) -5.0 P+ LM2940CS-9.0/NOPB ACTIVE DDPAK/ KTT 3 45 Green (RoHS SN Level-3-245C-168 HR 0 to 125 LM2940CS TO-263 & no Sb/Br) -9.0 P+ LM2940CSX-12 NRND DDPAK/ KTT 3 500 TBD Call TI Call TI 0 to 125 LM2940CS TO-263 -12 P+ LM2940CSX-12/NOPB ACTIVE DDPAK/ KTT 3 500 Green (RoHS SN Level-3-245C-168 HR 0 to 125 LM2940CS TO-263 & no Sb/Br) -12 P+ LM2940CSX-15/NOPB ACTIVE DDPAK/ KTT 3 500 Green (RoHS SN Level-3-245C-168 HR 0 to 125 LM2940CS TO-263 & no Sb/Br) -15 P+ LM2940CSX-5.0/NOPB ACTIVE DDPAK/ KTT 3 500 Green (RoHS SN Level-3-245C-168 HR 0 to 125 LM2940CS TO-263 & no Sb/Br) -5.0 P+ LM2940CSX-9.0/NOPB ACTIVE DDPAK/ KTT 3 500 Green (RoHS SN Level-3-245C-168 HR 0 to 125 LM2940CS TO-263 & no Sb/Br) -9.0 P+ LM2940CT-12 NRND TO-220 NDE 3 45 TBD Call TI Call TI 0 to 125 LM2940CT -12 P+ LM2940CT-12/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS SN Level-1-NA-UNLIM 0 to 125 LM2940CT & no Sb/Br) -12 P+ LM2940CT-15 NRND TO-220 NDE 3 45 TBD Call TI Call TI 0 to 125 LM2940CT -15 P+ LM2940CT-15/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS SN Level-1-NA-UNLIM 0 to 125 LM2940CT & no Sb/Br) -15 P+ LM2940CT-5.0 NRND TO-220 NDE 3 45 TBD Call TI Call TI 0 to 125 LM2940CT -5.0 P+ Addendum-Page 1

PACKAGE OPTION ADDENDUM www.ti.com 9-Jun-2020 Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking Samples (1) Drawing Qty (2) (6) (3) (4/5) LM2940CT-5.0/LF01 ACTIVE TO-220 NDG 3 45 Green (RoHS SN Level-3-245C-168 HR LM2940CT & no Sb/Br) -5.0 P+ LM2940CT-5.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS SN Level-1-NA-UNLIM 0 to 125 LM2940CT & no Sb/Br) -5.0 P+ LM2940CT-9.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS SN Level-1-NA-UNLIM 0 to 125 LM2940CT & no Sb/Br) -9.0 P+ LM2940IMP-10/NOPB ACTIVE SOT-223 DCY 4 1000 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 L55B & no Sb/Br) LM2940IMP-12/NOPB ACTIVE SOT-223 DCY 4 1000 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 L56B & no Sb/Br) LM2940IMP-15 NRND SOT-223 DCY 4 1000 TBD Call TI Call TI -40 to 85 L70B LM2940IMP-15/NOPB ACTIVE SOT-223 DCY 4 1000 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 L70B & no Sb/Br) LM2940IMP-5.0 NRND SOT-223 DCY 4 1000 TBD Call TI Call TI -40 to 85 L53B LM2940IMP-5.0/NOPB ACTIVE SOT-223 DCY 4 1000 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 L53B & no Sb/Br) LM2940IMP-9.0/NOPB ACTIVE SOT-223 DCY 4 1000 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 L0EB & no Sb/Br) LM2940IMPX-10/NOPB ACTIVE SOT-223 DCY 4 2000 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 L55B & no Sb/Br) LM2940IMPX-12/NOPB ACTIVE SOT-223 DCY 4 2000 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 L56B & no Sb/Br) LM2940IMPX-5.0/NOPB ACTIVE SOT-223 DCY 4 2000 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 L53B & no Sb/Br) LM2940IMPX-8.0/NOPB ACTIVE SOT-223 DCY 4 2000 Green (RoHS SN Level-1-260C-UNLIM -40 to 85 L54B & no Sb/Br) LM2940LD-12 NRND WSON NGN 8 1000 TBD Call TI Call TI -40 to 125 L00018B LM2940LD-12/NOPB ACTIVE WSON NGN 8 1000 Green (RoHS SN Level-3-260C-168 HR -40 to 125 L00018B & no Sb/Br) LM2940LD-5.0/NOPB ACTIVE WSON NGN 8 1000 Green (RoHS SN Level-3-260C-168 HR -40 to 125 L00014B & no Sb/Br) LM2940S-10 NRND DDPAK/ KTT 3 45 TBD Call TI Call TI -40 to 125 LM2940S TO-263 -10 P+ LM2940S-10/NOPB ACTIVE DDPAK/ KTT 3 45 Green (RoHS SN Level-3-245C-168 HR -40 to 125 LM2940S TO-263 & no Sb/Br) -10 P+ Addendum-Page 2

PACKAGE OPTION ADDENDUM www.ti.com 9-Jun-2020 Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking Samples (1) Drawing Qty (2) (6) (3) (4/5) LM2940S-12 NRND DDPAK/ KTT 3 45 TBD Call TI Call TI -40 to 125 LM2940S TO-263 -12 P+ LM2940S-12/NOPB ACTIVE DDPAK/ KTT 3 45 Green (RoHS SN Level-3-245C-168 HR -40 to 125 LM2940S TO-263 & no Sb/Br) -12 P+ LM2940S-5.0 NRND DDPAK/ KTT 3 45 TBD Call TI Call TI -40 to 125 LM2940S TO-263 -5.0 P+ LM2940S-5.0/NOPB ACTIVE DDPAK/ KTT 3 45 Green (RoHS SN Level-3-245C-168 HR -40 to 125 LM2940S TO-263 & no Sb/Br) -5.0 P+ LM2940S-8.0/NOPB ACTIVE DDPAK/ KTT 3 45 Green (RoHS SN Level-3-245C-168 HR -40 to 125 LM2940S TO-263 & no Sb/Br) -8.0 P+ LM2940S-9.0/NOPB ACTIVE DDPAK/ KTT 3 45 Green (RoHS SN Level-3-245C-168 HR -40 to 125 LM2940S TO-263 & no Sb/Br) -9.0 P+ LM2940SX-10 NRND DDPAK/ KTT 3 500 TBD Call TI Call TI -40 to 125 LM2940S TO-263 -10 P+ LM2940SX-10/NOPB ACTIVE DDPAK/ KTT 3 500 Green (RoHS SN Level-3-245C-168 HR -40 to 125 LM2940S TO-263 & no Sb/Br) -10 P+ LM2940SX-12 NRND DDPAK/ KTT 3 500 TBD Call TI Call TI -40 to 125 LM2940S TO-263 -12 P+ LM2940SX-12/NOPB ACTIVE DDPAK/ KTT 3 500 Green (RoHS SN Level-3-245C-168 HR -40 to 125 LM2940S TO-263 & no Sb/Br) -12 P+ LM2940SX-5.0 NRND DDPAK/ KTT 3 500 TBD Call TI Call TI -40 to 125 LM2940S TO-263 -5.0 P+ LM2940SX-5.0/NOPB ACTIVE DDPAK/ KTT 3 500 Green (RoHS SN Level-3-245C-168 HR -40 to 125 LM2940S TO-263 & no Sb/Br) -5.0 P+ LM2940SX-8.0/NOPB ACTIVE DDPAK/ KTT 3 500 Green (RoHS SN Level-3-245C-168 HR -40 to 125 LM2940S TO-263 & no Sb/Br) -8.0 P+ LM2940SX-9.0/NOPB ACTIVE DDPAK/ KTT 3 500 Green (RoHS SN Level-3-245C-168 HR -40 to 125 LM2940S TO-263 & no Sb/Br) -9.0 P+ LM2940T-10.0 NRND TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2940T 10.0 P+ LM2940T-10.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS SN Level-1-NA-UNLIM -40 to 125 LM2940T & no Sb/Br) 10.0 P+ LM2940T-12.0 NRND TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2940T 12.0 P+ LM2940T-12.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS SN Level-1-NA-UNLIM -40 to 125 LM2940T & no Sb/Br) 12.0 P+ Addendum-Page 3

PACKAGE OPTION ADDENDUM www.ti.com 9-Jun-2020 Orderable Device Status Package Type Package Pins Package Eco Plan Lead/Ball Finish MSL Peak Temp Op Temp (°C) Device Marking Samples (1) Drawing Qty (2) (6) (3) (4/5) LM2940T-5.0 NRND TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2940T -5.0 P+ LM2940T-5.0/LF08 ACTIVE TO-220 NEB 3 45 Green (RoHS SN Level-3-245C-168 HR LM2940T & no Sb/Br) -5.0 P+ LM2940T-5.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS SN Level-1-NA-UNLIM -40 to 125 LM2940T & no Sb/Br) -5.0 P+ LM2940T-8.0 NRND TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2940T -8.0 P+ LM2940T-8.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS SN Level-1-NA-UNLIM -40 to 125 LM2940T & no Sb/Br) -8.0 P+ LM2940T-9.0 NRND TO-220 NDE 3 45 TBD Call TI Call TI -40 to 125 LM2940T -9.0 P+ LM2940T-9.0/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS SN Level-1-NA-UNLIM -40 to 125 LM2940T & no Sb/Br) -9.0 P+ (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. Addendum-Page 4

PACKAGE OPTION ADDENDUM www.ti.com 9-Jun-2020 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 5

PACKAGE MATERIALS INFORMATION www.ti.com 29-Sep-2019 TAPE AND REEL INFORMATION *Alldimensionsarenominal Device Package Package Pins SPQ Reel Reel A0 B0 K0 P1 W Pin1 Type Drawing Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant (mm) W1(mm) LM2940CSX-12 DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940CSX-12/NOPB DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940CSX-15/NOPB DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940CSX-5.0/NOPB DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940CSX-9.0/NOPB DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940IMP-10/NOPB SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LM2940IMP-12/NOPB SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LM2940IMP-15 SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LM2940IMP-15/NOPB SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LM2940IMP-5.0 SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LM2940IMP-5.0/NOPB SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LM2940IMP-9.0/NOPB SOT-223 DCY 4 1000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LM2940IMPX-10/NOPB SOT-223 DCY 4 2000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LM2940IMPX-12/NOPB SOT-223 DCY 4 2000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 PackMaterials-Page1

PACKAGE MATERIALS INFORMATION www.ti.com 29-Sep-2019 Device Package Package Pins SPQ Reel Reel A0 B0 K0 P1 W Pin1 Type Drawing Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant (mm) W1(mm) LM2940IMPX-5.0/NOPB SOT-223 DCY 4 2000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LM2940IMPX-8.0/NOPB SOT-223 DCY 4 2000 330.0 16.4 7.0 7.5 2.2 12.0 16.0 Q3 LM2940LD-12 WSON NGN 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 LM2940LD-12/NOPB WSON NGN 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 LM2940LD-5.0/NOPB WSON NGN 8 1000 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 LM2940SX-10 DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940SX-10/NOPB DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940SX-12 DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940SX-12/NOPB DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940SX-5.0 DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940SX-5.0/NOPB DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940SX-8.0/NOPB DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 LM2940SX-9.0/NOPB DDPAK/ KTT 3 500 330.0 24.4 10.75 14.85 5.0 16.0 24.0 Q2 TO-263 PackMaterials-Page2

PACKAGE MATERIALS INFORMATION www.ti.com 29-Sep-2019 *Alldimensionsarenominal Device PackageType PackageDrawing Pins SPQ Length(mm) Width(mm) Height(mm) LM2940CSX-12 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940CSX-12/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940CSX-15/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940CSX-5.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940CSX-9.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940IMP-10/NOPB SOT-223 DCY 4 1000 367.0 367.0 35.0 LM2940IMP-12/NOPB SOT-223 DCY 4 1000 367.0 367.0 35.0 LM2940IMP-15 SOT-223 DCY 4 1000 367.0 367.0 35.0 LM2940IMP-15/NOPB SOT-223 DCY 4 1000 367.0 367.0 35.0 LM2940IMP-5.0 SOT-223 DCY 4 1000 367.0 367.0 35.0 LM2940IMP-5.0/NOPB SOT-223 DCY 4 1000 367.0 367.0 35.0 LM2940IMP-9.0/NOPB SOT-223 DCY 4 1000 367.0 367.0 35.0 LM2940IMPX-10/NOPB SOT-223 DCY 4 2000 367.0 367.0 35.0 LM2940IMPX-12/NOPB SOT-223 DCY 4 2000 367.0 367.0 35.0 LM2940IMPX-5.0/NOPB SOT-223 DCY 4 2000 367.0 367.0 35.0 LM2940IMPX-8.0/NOPB SOT-223 DCY 4 2000 367.0 367.0 35.0 LM2940LD-12 WSON NGN 8 1000 210.0 185.0 35.0 LM2940LD-12/NOPB WSON NGN 8 1000 210.0 185.0 35.0 LM2940LD-5.0/NOPB WSON NGN 8 1000 210.0 185.0 35.0 LM2940SX-10 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940SX-10/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940SX-12 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940SX-12/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940SX-5.0 DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940SX-5.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940SX-8.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 LM2940SX-9.0/NOPB DDPAK/TO-263 KTT 3 500 367.0 367.0 45.0 PackMaterials-Page3

MECHANICAL DATA NDE0003B www.ti.com

MECHANICAL DATA KTT0003B TS3B (Rev F) BOTTOM SIDE OF PACKAGE www.ti.com

MECHANICAL DATA MPDS094A – APRIL 2001 – REVISED JUNE 2002 DCY (R-PDSO-G4) PLASTIC SMALL-OUTLINE 6,70 (0.264) 6,30 (0.248) 3,10 (0.122) 2,90 (0.114) 4 0,10 (0.004) M 7,30 (0.287) 3,70 (0.146) 6,70 (0.264) 3,30 (0.130) Gauge Plane 1 2 3 0,84 (0.033) 0°–10° 0,25 (0.010) 2,30 (0.091) 0,66 (0.026) 0,10 (0.004) M 4,60 (0.181) 0,75 (0.030) MIN 1,70 (0.067) 1,80 (0.071) MAX 1,50 (0.059) 0,35 (0.014) 0,23 (0.009) Seating Plane 0,10 (0.0040) 0,08 (0.003) 0,02 (0.0008) 4202506/B 06/2002 NOTES: A. All linear dimensions are in millimeters (inches). B. This drawing is subject to change without notice. C. Body dimensions do not include mold flash or protrusion. D. Falls within JEDEC TO-261 Variation AA. • POST OFFICE BOX 655303 DALLAS, TEXAS 75265

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PACKAGE OUTLINE NGN0008A WSON - 0.8 mm max height SCALE 3.000 PLASTIC SMALL OUTLINE - NO LEAD 4.1 B A 3.9 PIN 1 INDEX AREA 4.1 3.9 PIN 1 ID DETAIL A PIN 1 ID C 0.8 MAX SEATING PLANE 0.05 0.08 C 0.00 2.2 0.05 EXPOSED SYMM (0.2) TYP THERMAL PAD 6X 0.8 4 5 2X 9 SYMM 2.4 3 0.05 SEE DETAIL A 8 1 0.35 (0.25) 8X 0.25 0.6 (0.25) (0.2) 8X 0.1 C A B 0.4 PIN 1 ID (0.15) 0.05 C 4214794/A 11/2019 NOTES: 1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M. 2. This drawing is subject to change without notice. 3. The package thermal pad must be soldered to the printed circuit board for thermal and mechanical performance. www.ti.com

EXAMPLE BOARD LAYOUT NGN0008A WSON - 0.8 mm max height PLASTIC SMALL OUTLINE - NO LEAD (2.2) 8X (0.5) SYMM 1 8X (0.3) 8 SYMM 9 (3) (1.25) 6X (0.8) 4 5 (R0.05) TYP ( 0.2) VIA TYP (0.85) (3.3) LAND PATTERN EXAMPLE EXPOSED METAL SHOWN SCALE:15X 0.07 MAX 0.07 MIN ALL AROUND ALL AROUND EXPOSED EXPOSED METAL METAL SOLDER MASK METAL METAL UNDER SOLDER MASK OPENING SOLDER MASK OPENING NON SOLDER MASK SOLDER MASK DEFINED DEFINED (PREFERRED) SOLDER MASK DETAILS 4214794/A 11/2019 NOTES: (continued) 4. This package is designed to be soldered to a thermal pad on the board. For more information, see Texas Instruments literature number SLUA271 (www.ti.com/lit/slua271). 5. Vias are optional depending on application, refer to device data sheet. If any vias are implemented, refer to their locations shown on this view. It is recommended that vias under paste be filled, plugged or tented. www.ti.com

EXAMPLE STENCIL DESIGN NGN0008A WSON - 0.8 mm max height PLASTIC SMALL OUTLINE - NO LEAD 0.59 SYMM METAL 8X (0.5) TYP 1 8X (0.3) 8 4X (1.31) SYMM 9 (0.755) 6X (0.8) 5 4 (R0.05) TYP 4X (0.98) (3.3) SOLDER PASTE EXAMPLE BASED ON 0.125 mm THICK STENCIL EXPOSED PAD 9: 78% PRINTED SOLDER COVERAGE BY AREA UNDER PACKAGE SCALE:20X 4214794/A 11/2019 NOTES: (continued) 6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate design recommendations. www.ti.com

MECHANICAL DATA NDG0003F T03F (Rev B) www.ti.com

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