LMx37 3-Terminal Adjustable Regulators (Rev. L)

1 C1+C2R1R2+INPUT OUTPUTADJUSTMENTLM237orLM337 VVOIP roductFolderSample &BuyTechnicalDocumentsTools &SoftwareSupport &CommunityLM237,LM337 SLVS047L NOVEMBER1981 REVISEDJANUARY2015 LMx373-TerminalAdjustableRegulators1 Features3 DescriptionTheLM237andLM337are adjustable3-terminal1 OutputVoltageRangeAdjustableFromnegative -voltageregulatorscapableof supplyingin V to 37 Vexcessof A overan outputvoltagerangeof OutputCurrentCapabilityof A MaxV to 37 V. Theyrequireonlytwo externalresistors Input-to set the outputvoltageand one (1) PeakOutputCurrentConstantOverTemperature PARTNUMBERPACKAGEBODYSIZE(NOM)Rangeof RegulatorTO-220(4) x RippleRejectionTypically77 dBLMx37TO-263(4) x DirectReplacementfor Industry-StandardLM237TO-252(4) mm x LM337(1)

2 For all availablepackages,see the orderableaddendumatthe end of the Applications ApplicationsRequiringNegativeOutputVolta georPrecisionCurrentRegulation ConsumerElectronics End Equipment PortableApplications4 SimplifiedSchematic1An IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand ,LM337 SLVS047L NOVEMBER1981 Applicationand Pin Configurationand Deviceand Mechanical,Packaging,and RevisionHistoryChangesfromRevisionK (November2007)to RevisionLPage AddedApplications,DeviceInformationtable ,PinFunctionstable,ESDR atingstable,ThermalInformationtable,Typi calCharacteristics,FeatureDescriptionsec tion,DeviceFunctionalModes,Applicationan dImplementationsection,PowerSupplyRecomm endationssection,Layoutsection,Deviceand DocumentationSupportsection,andMechanica l,Packaging, 1981 2015, , KTP, OR KVU PACKAGE(TOP VIEW) (TO-263) PACKAGE(TOP VIEW)OUTPUTINPUTADJUSTMENTLM237, (TO-220) PACKAGE(TOP VIEW) (TO-220) PACKAGE(TOP VIEW)

3 ADJUSTMENTINPUTINPUTLM237, NOVEMBER1981 REVISEDJANUARY20156 Pin Configurationand FunctionsPin for the externalADJUSTMENT1 Iresistorsto adjustthe inputvoltageand currentwill beINPUT2 IdesignatedVIand outputvoltageand currentwill beOUTPUT3 OdesignatedVOand 1981 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback3 ProductFolderLinks:LM237LM337LM237,LM337 SLVS047L NOVEMBER1981 (unlessotherwisenoted)(1)MINMAXUNITVI VOInput-to-outputdifferentialvoltage 40 VTJO peratingvirtualjunctiontemperature150 mm (1/16in) fromcasefor 10 s260 CTstgStoragetemperaturerange 65150 C(1)StressesbeyondthoselistedunderAbsolu teMaximumRatingsmay causepermanentdamageto the stressratingsonly,and functionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder RecommendedOperatingConditionsis not absolute-maximum-ratedconditionsfor extendedperiodsmay (HBM),per ANSI/ESDA/JEDECJS-001,all pins(1)1500V(ESD)

4 ElectrostaticdischargeVChargeddevicemode l(CDM),per JEDEC specificationJESD22-C101,1500all pins(2)(1)JEDEC documentJEP155statesthat 500-VHBM allowssafe manufacturingwith a standardESDcontrolprocess.(2)JEDEC documentJEP157statesthat 250-VCDM allowssafe manufacturingwith a |VI VO| 40 V, P 15 W101500 IOOutputcurrentmA|VI VO| 10 V, P 15 W61500LM237 25150 TJOperatingvirtualjunctiontemperature (1)KCKCSKTEKTPKTTKVUUNIT4 PINS4 PINS4 PINS4 PINS4 PINS4 PINSR C/WR JC(topJunction-to-case(top) )(1)For moreinformationabouttraditionaland new thermalmetrics,see theICPackageThermalMetricsapplicationrep ort(SPRA953).4 SubmitDocumentationFeedbackCopyright 1981 2015,TexasInstrumentsIncorporatedProduct FolderLinks.

5 LM237LM337LM237, NOVEMBER1981 operatingvirtualjunctiontemperature(unle ssotherwisenoted)LM237LM337 PARAMETERTESTCONDITIONS(1)UNITMINTYPMAXM INTYPMAXTJ= 25 (2)VI VO= 3 V to 40 V%/VTJ= MIN to 10 V, f = 120 Hz6060 RipplerejectiondBVO= 10 V, f = 120 Hz, CADJ= 10 F66776677|VO| 5 V2550mVIO= 10 mA to A,TJ= 25 C|VO| 5 Outputregulation|VO| 5 V5070mVIO= 10 mA to A|VO| 5 V1% output -voltagechangewithTJ= MIN to temperatureOutput-voltagelong-termdriftA fter1000h at TJ= MAXand VI VO= 40 Outputnoisevoltagef = 10 Hz to 10 kHz,TJ= 25 |VI VO| 40 |VI VO| 10 |VI VO| 15 |VI VO| 40 V, TJ= 25 AChangein ADJUSTMENTVI VO= V to 40 V, IO= 10 mA to MAX,2525 AcurrentTJ= 25 CVI VO= 3 V to 40 V,TJ= 25 C (OUTPUTIO= 10 mA to A,Vto ADJUSTMENT)

6 TJ= MIN to MAX rateddissipationThermalregulationInitial TJ= 25 C, (1)Unlessotherwisenoted,the followingtest conditionsapply:|VI VO| = 5 V and IO= A. For conditionsshownas MIN or MAX,usethe characteristicsare measuredwith a F capacitoracrossthe inputand a 1- F capacitoracrossthe usedto maintainthe junctiontemperatureas closeto the ambienttemperatureas takeninto accountseparately.(2)Inputregulationis expressedhereas the percentagechangein outputvoltageper 1-V changeat the 25 CLM237,LM337 PARAMETERTESTCONDITIONS(1)UNITMINTYPMAXI nputregulation(2)VI VO= 3 V to 40 10 V, f = 120 Hz60 RipplerejectiondBVO= 10 V, f = 120 Hz, CADJ= 10 F6677|VO| 5 V50mVOutputregulationIO= 10 mA to A|VO| 5 Outputnoisevoltagef = 10 Hz to 10 |VI VO| 40 maintainmAregulation|VI VO| 10 |VI VO| 15 |VI VO| 40 AChangein ADJUSTMENT currentVI VO= V to 40 V, IO= 10 mA to MAX25 AReferencevoltageVI VO= 3 V to 40 V, IO= 10 mA to A, (OUTPUTto ADJUSTMENT)P rateddissipation(1)

7 Unlessotherwisenoted,the followingtest conditionsapply:|VI VO| = 5 V and IO= A. All characteristicsare measuredwith a F capacitoracrossthe inputand a 1- F capacitoracrossthe usedto maintainthe junctiontemperatureas closeto the ambienttemperatureas takeninto accountseparately.(2)Inputregulationis expressedhereas the percentagechangein outputvoltageper 1-V changeat the 1981 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback5 ProductFolderLinks:LM237LM337 to output voltage (V)Load current (mA)V(REF)C001LM237,LM337 SLVS047L NOVEMBER1981 AdjustmentVoltagevs Loadcurrent(VIN= V)6 SubmitDocumentationFeedbackCopyright 1981 2015, VIADJINPUTOUTPUTADJUSTOver temp & over current protection++ lm237 , NOVEMBER1981 REVISEDJANUARY20158 LMx37devicesare adjustable3-terminalnegative-voltageregu latorscapableof supplyingin excessof overan outputvoltagerangeof V to 37 V.

8 Theyare exceptionallyeasyto use,requiringonlytwoexternalresistorsto set the outputvoltageand one outputcapacitorfor currentdesignis optimizedfor excellentregulationand low addition,LM237and LM337featureinternalcurrentlimiting,ther malshutdown,and safe-areacompensation,makingthemvirtuall yimmuneto failureby widevarietyof applications,includinglocalon-cardregula tion,programmableoutput-voltageregulatio n,and 1981 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback7 ProductFolderLinks:LM237LM337 ADJUSTMENTOUTPUTINPUTLM237,LM337 SLVS047L NOVEMBER1981 ADJUSTMENTpin servesas a voltageadjustmentreferencefor the ADJUSTMENTpin can beattachedto a resistordividercircuitto adjustits a resistordividercircuiton theADJUSTMENTpin determinesthe 1981 2015,TexasInstrumentsIncorporatedProduct FolderLinks.

9 LM237LM337C1+C2R1R2+INPUT OUTPUTADJUSTMENTLM237orLM337 VVOIADJUSTMENTOUTPUTINPUTVISRVOLM237orLM 337RS= VILIMITOUTILM237, NOVEMBER1981 REVISEDJANUARY20159 Applicationand ImplementationNOTEI nformationin the followingapplicationssectionsis not partof the TI componentspecification,and TI doesnot warrantits accuracyor s customersareresponsiblefor determiningsuitabilityof componentsfor test theirdesignimplementationto Current-LimitingCircuitThisapplicationus esthe LMx37device'sreferencevoltage,combinedwi th the seriesresistorRS, to limit thecurrentto 1- F solidtantalumon the inputpin if the regulatoris morethan10 cm fromthe powersupplyfilter capacitor 1- F solidtantalumor 10- F aluminumelectrolyticcapacitoris requiredon the outputpin for stability.

10 R1, whichis usually120 as part of the resistordivider. R2, whichcan be variedto changethe valueof 1981 2015,TexasInstrumentsIncorporatedSubmitD ocumentationFeedback9 ProductFolderLinks:LM237LM337 Frequency (Hz)Ripple Rejection (dB)01020304050607080101001k10k100k1mD00 1 CADJ = 10 FCADJ = 0 FOVR2 =- - lm237 ,LM337 SLVS047L NOVEMBER1981 (continued) determinedby the valuesof R1 and R2. ChoosingR1 = 120 meansthat of currentwillflowthroughR1. The ~10 mA of currentsatisfiesthe minimumoperatingcurrentand currentis comingfromground,the sameamountof currentwill flow throughR2. Therefore,the size ofR2 will be the dominantfactorin adjustingVO.