LM138 and LM338 5-Amp Adjustable Regulators datasheet …

1 Copyright 2016, Texas Instruments IncorporatedPin 1. Adjustment2. Output3. InputTab/Case is Output1TO-33TO-220123 ProductFolderSample &BuyTechnicalDocumentsTools &SoftwareSupport &CommunityAn IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand , LM338 SNVS771C MAY1998 REVISEDDECEMBER2016LM138and LM3385-AmpAdjustableRegulators11 Features1 Specified7-A PeakOutputCurrent Specified5-A OutputCurrent AdjustableOutputDownto V SpecifiedThermalRegulation CurrentLimitConstantWithTemperature P+ProductEnhancementTested Outputis Short-CircuitProtected2 Applications AdjustablePowerSupplies ConstantCurrentRegulators BatteryChargersAvailablePackagesTypicalA pplicationCircuit3 DescriptionTheLM138seriesof adjustable3-terminalpositivevoltageregul atorsis capableof supplyingin excessof 5 A overa use and requireonly 2 resistorsto set the outstandingloadandlineregulation.

2 Comparableto suppliedin a uniquefeatureof the LM138familyis currentlimitcircuitryallowspeakcurrentso f up to 12 A to be drawnfromthe regulatorfor shortperiodsof allowstheLM138to be ,thecurrentlimitdecreasesto a safevalueprotectingthe the chipare thermaloverloadprotectionandsafeareaprot ectionfor the the adjustment(ADJ)pin is ,no capacitorsare neededunlessthe deviceis situatedmorethan6 inchesfromthe inputfiltercapacitorsin whichcasean inputbypassis outputcapacitorcanbe addedto improvetransientresponse,whilebypassingt he adjustmentpin increasesthe ripplerejectionof the discretedesigns,the LM138is usefulin a regulatoris floatingandreceivesonlytheinput-to-outpu tdifferentialvoltage,suppliesof severalhundredvoltscan beregulatedas longas the maximuminputto outputdifferentialis not exceeded.

3 Do not short-circuitoutputto the LM138serieswhichhaveaKsuffixare packagedin a standardsteelTO-CANpackage,whilethosewit haTsuffixare packagedin a ratedfor TJ= 55 C to 150 C, and theLM338is ratedfor TJ= 0 C to 125 (1)PARTNUMBERPACKAGEBODYSIZE(NOM)LM138TO -CAN(2) (3) (2) (1) For all availablepackages,see the orderableaddendumatthe end of the , LM338 SNVS771C MAY1998 :LM138LM338 SubmitDocumentationFeedbackCopyright 1998 2016,TexasInstrumentsIncorporatedTableof Contents1 Pin Configurationand Applicationand Deviceand Mechanical,Packaging,and RevisionHistoryNOTE:Pagenumbersfor previousrevisionsmay differfrompagenumbersin the (April2013)to RevisionCPage AddedDeviceInformationtable,Pin Configurationand Functionssection,Specificationssection,R ecommendedOperatingConditionstable,Therm alInformationtable,DetailedDescriptionse ction,Applicationand Implementationsection,PowerSupplyRecomme ndationssection,Layoutsection,Deviceand DocumentationSupportsection,andMechanica l,Packaging,and ChangedJunctionto Ambient,R JA, valueinThermalInformationtableFrom:50 C/WTo: C/W(NDE).

4 4 ChangedJunctionto Case,R JC(top), valueinThermalInformationtableFrom:4 C/WTo: C/W(NDE)..4 ChangesfromRevisionA (April2013)to RevisionBPage Changedlayoutof NationalSemiconductorDataSheetto TI , MAY1998 REVISEDDECEMBER2016 ProductFolderLinks:LM138LM338 SubmitDocumentationFeedbackCopyright 1998 2016,TexasInstrumentsIncorporated5 Pin Configurationand FunctionsNDSP ackage2-PinTO-CANB ottomViewPackageNumberNDS0002 ANDEP ackage3-PinTO-220 FrontViewPackageNumberNDE0003 BPin FunctionsPINI/ODESCRIPTIONNAMETO-220TO-C ANADJ11 IOutputvoltageadjustmentpin. Connectto a resistordividerto set VOVIN32 ISupplyinputpinVOUT2 CaseOVoltageoutputpin(1)Stressesbeyondth oselistedunderAbsoluteMaximumRatingsmay causepermanentdamageto the stressratingsonly,whichdo not implyfunctionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder RecommendedOperatingConditions.

5 Exposureto absolute-maximum-ratedconditionsfor extendedperiodsmay (unlessotherwisenoted)(1)MINMAXUNITI nputand outputvoltagedifferential (soldering,10 s)300 CTO-220package(soldering,4 s)260 Operatingtemperature,TJLM138 55150 CLM3380125 Storagetemperature,Tstg 65150 (unlessotherwisenoted)MINMAXUNITI nput-to-outputvoltagedifferential340 VOutputcurrent5A4LM138, LM338 SNVS771C MAY1998 :LM138LM338 SubmitDocumentationFeedbackCopyright 1998 2016,TexasInstrumentsIncorporated(1)For moreinformationabouttraditionaland new thermalmetrics,see the Semiconductorand IC (1)LM338LM338 UNITNDS(TO-CAN)NDE(TO-220)NDS(TO-CAN)2 PINS3 PINS2 PINSR C/WR JC(top)Junction-to-case(top) C/WR JBJunction-to-boardthermalresistance C/W JTJunction-to-topcharacterizationparamet er C/W JBJunction-to-boardcharacterizationparam eter C/WR JC(bot)Junction-to-case(bottom)thermalre sistance C/W(1)Thesespecificationsare applicablefor powerdissipationsup to 50 W for the TO-3(NDS)packageand 25 W for the TO-220(NDE) specifiedat thesevaluesup to ,powerdissipationislimitedby limits(thatis, the numbersin the minimumand maximumcolumns)

6 Are specifiedto TI's AOQL(AverageOutgoingQualityLevel).(2)Reg ulationis measuredat a constantjunctiontemperature,usingpulsete stingwith a low duty outputvoltagedue toheatingeffectsare coveredunderthe specificationsfor : LM138 Valuesapplyfor TJ= 25 C; VIN VOUT= 5 V; and IOUT= 10 mA (unlessotherwisenoted).(1)PARAMETERTESTC ONDITIONSMINTYPMAXUNITVREFR eferencevoltage3 V (VIN VOUT) 35 V, 10 mA IOUT 5 A, P 50 W,TJ= 55 C to 150 regulation3 V (VIN VOUT) 35 V(2)TJ= 25 55 C to 150 mA IOUT 5 A(2)TJ= 25 55 C to 150 ms currentTJ= 55 C to 150 C45100 A IADJA djustmentpin currentchange10 mA IOUT 5 A, 3 V (VIN VOUT) 35 V,TJ= 55 C to 150 A VR/TTemperaturestabilityTJ= 55 C to 150 C1%ILOAD(MIN)Minimumload currentVIN VOUT= 35 V, TJ= 55 C to 150 VOUT 10 VDC, TJ= 55 C to 150 ,TJ= 55 C to 150 C712 AVIN VOUT= 30 V11 AVNRMS outputnoise(percentof VOUT)

7 10 Hz f 10 VR/ VINR ipplerejectionratioVOUT= 10 V, f = 120 Hz, CADJ= 0 F,TJ= 55 C to 150 C60dBVOUT= 10 V, f = 120 Hz, CADJ= 10 F,TJ= 55 C to 150 C6075dBLong-termstabilityTJ= 125 C, , MAY1998 REVISEDDECEMBER2016 ProductFolderLinks:LM138LM338 SubmitDocumentationFeedbackCopyright 1998 2016,TexasInstrumentsIncorporated(1)Thes especificationsare applicablefor powerdissipationsup to 50 W for the TO-3(NDS)packageand 25 W for the TO-220(NDE) specifiedat thesevaluesup to ,powerdissipationislimitedby limits(thatis, the numbersin the minimumand maximumcolumns)are specifiedto TI's AOQL(AverageOutgoingQualityLevel).(2)Reg ulationis measuredat a constantjunctiontemperature,usingpulsete stingwith a low duty outputvoltagedue toheatingeffectsare coveredunderthe specificationsfor : LM338 Valuesapplyfor TJ= 25 C; VIN VOUT= 5 V; and IOUT= 10 mA (unlessotherwisenoted).

8 (1)PARAMETERTESTCONDITIONSMINTYPMAXUNITV REFR eferencevoltage3 V (VIN VOUT) 35 V, 10 mA IOUT 5 A, P 50 W,TJ= 0 C to 125 regulation3 V (VIN VOUT) 35 V(2)TJ= 25 0 C to 125 mA IOUT 5 A(2)TJ= 25 0 C to 125 currentTJ= 0 C to 125 C45100 A IADJA djustmentpin currentchange10 mA IOUT 5 A, 3 V (VIN VOUT) 35 V,TJ= 0 C to 125 A VR/TTemperaturestabilityTJ= 0 C to 125 C1 ILOAD(MIN)Minimumload currentVIN VOUT= 35 V, TJ= 0 C to 125 VOUT 10 VDC, TJ= 0 C to 125 ,TJ= 0 C to 125 C712 AVIN VOUT= 30 V1 AVNRMS outputnoise(percentof VOUT)10 Hz f 10 VR/ VINR ipplerejectionratioVOUT= 10 V, f = 120 Hz, CADJ= 0 F,TJ= 0 C to 125 C60dBVOUT= 10 V, f = 120 Hz, CADJ= 10 F,TJ= 0 C to 125 C6075dBLong-termstabilityTJ= 125 C, , LM338 SNVS771C MAY1998 :LM138LM338 SubmitDocumentationFeedbackCopyright 1998 2016, CurrentLimitFigure2.

9 CurrentLimitFigure3. CurrentLimitFigure4. LoadRegulationFigure5. DropoutVoltageFigure6. AdjustmentCurrent7LM138, MAY1998 REVISEDDECEMBER2016 ProductFolderLinks:LM138LM338 SubmitDocumentationFeedbackCopyright 1998 2016,TexasInstrumentsIncorporatedTypical Characteristics(continued)Figure7. TemperatureStabilityFigure8. OutputImpedanceFigure9. MinimumOperatingCurrentFigure10. RippleRejectionFigure11. RippleRejectionFigure12. RippleRejection8LM138, LM338 SNVS771C MAY1998 :LM138LM338 SubmitDocumentationFeedbackCopyright 1998 2016,TexasInstrumentsIncorporatedTypical Characteristics(continued)Figure13. LineTransientResponseFigure14. LoadTransientResponse9LM138, MAY1998 REVISEDDECEMBER2016 ProductFolderLinks:LM138LM338 SubmitDocumentationFeedbackCopyright 1998 2016,TexasInstrumentsIncorporated7 LM138and LM338devicesare Adjustable ,three-terminal,positive-volta geregulatorscapableof supplyingmorethan5 A overan output-voltagerangeof V to 32 V.

10 It requiresonly two externalresistorsto set typicalline regulationof typicalloadregulationof ,thermaloverloadprotection, the ADJUST terminalis versatilein theirapplications,includingusesin programmableoutputregulationand , by connectinga fixedresistorbetweenthe ADJUSTand OUTPUT terminals,the LM138and LM338devicescan functionas a optionaloutputcapacitorcan be addedto ADJUST terminalcan be bypassedto achieveveryhigh ripple-rejectionratios,whichare difficultto achievewith outputimpedanceand an outputcapacitoris lowesttemperature,3-V headroomis recommended(VI VO). overtemperatureshutdownprotectsthe deviceagainstoverloador the ADJUST terminalprovideseasyoutputvoltageor current(not both) currentregulationapplications,a singleresistorwhoseresistancevalueis mustbe voltageregulationapplications,two resistorsset , LM338 SNVS771C MAY1998 :LM138LM338 SubmitDocumentationFeedbackCopyright 1998 2016, deviceOUTPUTpin sourcescurrentnecessaryto makeOUTPUTpin greaterthanADJUST terminalto devicerequiresup to 3-V headroom(VI VO) to operatein headroom,the devicemaydropout and OUTPUT voltageis INPUT voltageminusdropout LightLoadsThe devicepassesits biascurrentto the OUTPUTpin.