LM1575

LM2575HVS-ADJ TI | Alldatasheet

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 LM1575/LM2575/LM2575HVSIMPLESWITCHER® 1AStep-DownVoltageRegulator Check forSamples: LM1575 ,LM2575-N ,LM2575HV 1FEATURES DESCRIPTION The LM2575 seriesof regulatorsare monolithic 23• 3.3V,5V,12V,15V,and AdjustableOutput integratedcircuitsthatprovidealltheactivefunctionsVersions fora step-down(buck)switchingregulator,capableof• AdjustableVersionOutput VoltageRange, drivinga 1A load with excellentline and load – 1.23Vto37V (57V forHV Version)±4% regulation.These devicesareavailableinfixedoutput voltagesof 3.3V,5V, 12V, 15V, and an adjustableMax Over outputversion.– Lineand Load Conditions Requiring a minimum number of external• Specified1A Output Current components,theseregulatorsare simpletouse and• Wide InputVoltageRange, 40V up to60V for includeinternalfrequencycompensationand a fixed-HV Version frequencyoscillator.

• RequiresOnly 4 ExternalComponents The LM2575 series offers a high-efficiency• 52 kHz FixedFrequency InternalOscillator replacement for popular three-terminallinear
• TTL Shutdown Capability,Low Power Standby regulators.Itsubstantiallyreduces the size of the Mode heat sink,and in many cases no heat sink is required.• High Efficiency A standardseriesofinductorsoptimizedforuse with• Uses ReadilyAvailableStandard Inductors the LM2575 are availablefrom severaldifferent• Thermal Shutdown and CurrentLimit manufacturers.This featuregreatlysimplifiestheProtection designofswitch-modepower supplies.
• P+ Product Enhancement Tested Other featuresincludea specified±4% toleranceon outputvoltagewithinspecifiedinputvoltagesandAPPLICATIONS outputload conditions,and ±10% on the oscillator
• Simple High-EfficiencyStep-Down (Buck) frequency.Externalshutdown is included,featuring Regulator 50 μA (typical)standby current.The outputswitch includescycle-by-cyclecurrentlimiting,as wellas• EfficientPre-RegulatorforLinearRegulators thermal shutdown for fullprotectionunder fault• On-Card SwitchingRegulators conditions.
• PositivetoNegativeConverter(Buck-Boost) TypicalApplication (FixedOutputVoltageVersions) Pinnumbers arefortheTO-220 package. Pleasebe aware thatan importantnoticeconcerningavailability,standardwarranty,and use incriticalapplicationsof Texas Instrumentssemiconductorproductsand disclaimerstheretoappearsattheend ofthisdatasheet. 2SIMPLE SWITCHER isa registeredtrademarkofTexas Instruments. 3Allothertrademarksarethepropertyoftheirrespectiveowners. PRODUCTION DATA informationiscurrentas ofpublicationdate. Copyright© 1999–2013,Texas InstrumentsIncorporatedProductsconform to specificationsper the terms of the Texas Instrumentsstandardwarranty.Productionprocessingdoes not necessarilyincludetestingofallparameters.

LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com Block Diagram and TypicalApplication 3.3V,R2 = 1.7k 5V,R2 = 3.1k 12V,R2 = 8.84k 15V,R2 = 11.3k ForADJ. Version R1 = Open, R2 = 0Ω Pinnumbers arefortheTO-220 package. Figure1.

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 Connection Diagrams (XX indicatesoutputvoltageoption.) Top View Top View Side View Figure2.StraightLeads Figure3.Bent,Staggered Leads Figure4.LM2575T-XX Flow LB03 or5-Lead TO-220 Package 5-Lead TO-220 Package LM2575HVT-XX Flow LB03LM2575T-XX or LM2575HVT-XX See Package Number NDH0005D See Package Number NDH0005DSee Package Number KC0005A Top View Top View *No InternalConnection *No InternalConnection Figure5.16-Lead CDIP and PDIP Packages Figure6.24-Lead SurfaceMount SOIC Package LM2575N-XX or LM2575HVN-XX LM2575M-XX or LM2575HVM-XX LM1575J-XX-QML See Package Number DW0024B See Package Numbers NFE0016A and NBG Top View Figure7. DDPAK/TO-263 Package 5-Lead Surface-MountPackage See Package Number KTT0005B Side View Figure8. LM2575S-XX or LM2575HVS-XX See Package Number KTT0005B Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLinks:LM1575 LM2575-N LM2575HV

LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com These deviceshave limitedbuilt-inESD protection.The leadsshouldbe shortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamage totheMOS gates. ABSOLUTE MAXIMUM RATINGS (1)(2)(3) Maximum SupplyVoltage LM1575/LM2575 45V LM2575HV 63V ON /OFF PinInputVoltage −0.3V≤ V ≤ +VIN OutputVoltagetoGround (SteadyState) −1V Power Dissipation InternallyLimited StorageTemperatureRange −65°C to+150°C Maximum JunctionTemperature 150°C Minimum ESD Rating (C = 100 pF,R = 1.5kΩ) 2 kV Lead Temperature (Soldering,10 sec.) 260°C (1) AbsoluteMaximum Ratingsindicatelimitsbeyond whichdamage tothedevicemay occur.OperatingRatingsindicateconditionsfor whichthedeviceisintendedtobe functional,butdo notensurespecificperformancelimits.Forspecifiedspecificationsand test conditions,see ElectricalCharacteristics. (2) IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTISalesOffice/Distributorsforavailabilityand specifications. (3) RefertoRETS LM1575J forcurrentrevisionofmilitaryRETS/SMD. OPERATING RATINGS TemperatureRange LM1575 −55°C ≤ TJ ≤ +150°C LM2575/LM2575HV −40°C ≤ TJ ≤ +125°C SupplyVoltage LM1575/LM2575 40V LM2575HV 60V ELECTRICAL CHARACTERISTICS LM1575-3.3,LM2575-3.3,LM2575HV-3.3 SpecificationswithstandardtypefaceareforTJ = 25°C, and thosewithboldfacetypeapplyoverfullOperating Temperature Range . LM2575-3.3LM1575-3.3 UnitsLM2575HV-3.3Symbol Parameter Conditions Typ (Limits) Limit(1) Limit(2) SYSTEM PARAMETERS TestCircuitFigure25 and Figure26(3) VOUT OutputVoltage VIN = 12V,ILOAD = 0.2A 3.3 V CircuitFigure25 and Figure26 3.267 3.234 V(Min) 3.333 3.366 V(Max) VOUT OutputVoltage 4.75V≤ VIN ≤ 40V,0.2A ≤ ILOAD ≤ 1A 3.3 V LM1575/LM2575 CircuitFigure25 and Figure26 3.200/3.168 3.168/3.135 V(Min) VOUT OutputVoltage 4.75V≤ VIN ≤ 60V,0.2A ≤ ILOAD ≤ 1A 3.3 V LM2575HV CircuitFigure25 and Figure26 3.200/3.168 3.168/3.135 V(Min) η Efficiency VIN = 12V,ILOAD = 1A 75 % (1) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Alllimitsareused to calculateAverageOutgoingQualityLevel,and allare100% productiontested. (2) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Allroom temperaturelimits are100% productiontested.Alllimitsattemperatureextremes arespecifiedviacorrelationusingstandardStatisticalQualityControl (SQC) methods. (3) Externalcomponents such as thecatchdiode,inductor,inputand outputcapacitorscan affectswitchingregulatorsystemperformance. When theLM1575/LM2575 isused as shown inthetestcircuitFigure25 and Figure26,systemperformancewillbe as shown insystem parametersofElectricalCharacteristics.

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS LM1575-5.0,LM2575-5.0,LM2575HV-5.0 SpecificationswithstandardtypefaceareforTJ = 25°C, and thosewithboldfacetypeapplyoverfullOperating Temperature Range . LM2575-5.0LM1575-5.0 UnitsLM2575HV-5.0Symbol Parameter Conditions Typ (Limits) Limit(1) Limit(2) SYSTEM PARAMETERS TestCircuitFigure25 and Figure26(3) VOUT OutputVoltage VIN = 12V,ILOAD = 0.2A 5.0 V CircuitFigure25 and Figure26 4.950 4.900 V(Min) 5.050 5.100 V(Max) VOUT OutputVoltage 0.2A≤ ILOAD ≤ 1A, 5.0 V LM1575/LM2575 8V ≤ VIN ≤ 40V 4.850/4.800 4.800/4.750 V(Min)CircuitFigure25 and Figure26 VOUT OutputVoltage 0.2A≤ ILOAD ≤ 1A, 5.0 V LM2575HV 8V ≤ VIN ≤ 60V 4.850/4.800 4.800/4.750 V(Min)CircuitFigure25 and Figure26 η Efficiency VIN = 12V,ILOAD = 1A 77 % (1) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Alllimitsareused to calculateAverageOutgoingQualityLevel,and allare100% productiontested. (2) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Allroom temperaturelimits are100% productiontested.Alllimitsattemperatureextremes arespecifiedviacorrelationusingstandardStatisticalQualityControl (SQC) methods. (3) Externalcomponents such as thecatchdiode,inductor,inputand outputcapacitorscan affectswitchingregulatorsystemperformance. When theLM1575/LM2575 isused as shown inthetestcircuitFigure25 and Figure26,systemperformancewillbe as shown insystem parametersofElectricalCharacteristics. ELECTRICAL CHARACTERISTICS LM1575-12,LM2575-12,LM2575HV-12 SpecificationswithstandardtypefaceareforTJ = 25°C, and thosewithboldfacetypeapplyoverfullOperating Temperature Range . LM2575-12LM1575-12 UnitsLM2575HV-12Symbol Parameter Conditions Typ (Limits) Limit(1) Limit(2) SYSTEM PARAMETERS TestCircuitFigure25 and Figure26 (3) VOUT OutputVoltage VIN = 25V,ILOAD = 0.2A 12 V CircuitFigure25 and Figure26 11.88 11.76 V(Min) 12.12 12.24 V(Max) VOUT OutputVoltage 0.2A≤ ILOAD ≤ 1A, 12 V LM1575/LM2575 15V ≤ VIN ≤ 40V 11.64/11.52 11.52/11.40 V(Min)CircuitFigure25 and Figure26 VOUT OutputVoltage 0.2A≤ ILOAD ≤ 1A, 12 V LM2575HV 15V ≤ VIN ≤ 60V 11.64/11.52 11.52/11.40 V(Min)CircuitFigure25 and Figure26 η Efficiency VIN = 15V,ILOAD = 1A 88 % (1) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Alllimitsareused to calculateAverageOutgoingQualityLevel,and allare100% productiontested. (2) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Allroom temperaturelimits are100% productiontested.Alllimitsattemperatureextremes arespecifiedviacorrelationusingstandardStatisticalQualityControl (SQC) methods. (3) Externalcomponents such as thecatchdiode,inductor,inputand outputcapacitorscan affectswitchingregulatorsystemperformance. When theLM1575/LM2575 isused as shown inthetestcircuitFigure25 and Figure26,systemperformancewillbe as shown insystem parametersofElectricalCharacteristics. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLinks:LM1575 LM2575-N LM2575HV

LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS LM1575-15,LM2575-15,LM2575HV-15 SpecificationswithstandardtypefaceareforTJ = 25°C, and thosewithboldfacetypeapplyoverfullOperating Temperature Range . LM2575-15LM1575-15 UnitsLM2575HV-15Parameter Conditions Typ (Limits) Symbol Limit(1) Limit(2) SYSTEM PARAMETERS TestCircuitFigure25 and Figure26(3) VOUT OutputVoltage VIN = 30V,ILOAD = 0.2A 15 V CircuitFigure25 and Figure26 14.85 14.70 V(Min) 15.15 15.30 V(Max) VOUT OutputVoltage 0.2A≤ ILOAD ≤ 1A, 15 V LM1575/LM2575 18V ≤ VIN ≤ 40V 14.55/14.40 14.40/14.25 V(Min)CircuitFigure25 and Figure26 VOUT OutputVoltage 0.2A≤ ILOAD ≤ 1A, 15 V LM2575HV 18V ≤ VIN ≤ 60V 14.55/14.40 14.40/14.25 V(Min)CircuitFigure25 and Figure26 15.525/15.675 15.68/15.83 V(Max) η Efficiency VIN = 18V,ILOAD = 1A 88 % (1) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Alllimitsareused to calculateAverageOutgoingQualityLevel,and allare100% productiontested. (2) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Allroom temperaturelimits are100% productiontested.Alllimitsattemperatureextremes arespecifiedviacorrelationusingstandardStatisticalQualityControl (SQC) methods. (3) Externalcomponents such as thecatchdiode,inductor,inputand outputcapacitorscan affectswitchingregulatorsystemperformance. When theLM1575/LM2575 isused as shown inthetestcircuitFigure25 and Figure26,systemperformancewillbe as shown insystem parametersofElectricalCharacteristics. ELECTRICAL CHARACTERISTICS LM1575-ADJ, LM2575-ADJ, LM2575HV-ADJ SpecificationswithstandardtypefaceareforTJ= 25°C, and thosewithboldfacetypeapplyoverfullOperating Temperature Range . LM2575-ADJLM1575-ADJ UnitsLM2575HV-ADJSymbol Parameter Conditions Typ (Limits) Limit(1) Limit(2) SYSTEM PARAMETERS TestCircuitFigure25 and Figure26(3) VOUT Feedback Voltage VIN = 12V,ILOAD = 0.2A 1.230 V VOUT = 5V 1.217 1.217 V(Min)CircuitFigure25 and Figure26 1.243 1.243 V(Max) VOUT Feedback Voltage 0.2A≤ ILOAD ≤ 1A, 1.230 V LM1575/LM2575 8V ≤ VIN ≤ 40V 1.205/1.193 1.193/1.180 V(Min)VOUT = 5V,CircuitFigure25 and Figure26 1.255/1.267 1.267/1.280 V(Max) VOUT Feedback Voltage 0.2A≤ ILOAD ≤ 1A, 1.230 V LM2575HV 8V ≤ VIN ≤ 60V 1.205/1.193 1.193/1.180 V(Min)VOUT = 5V,CircuitFigure25 and Figure26 1.261/1.273 1.273/1.286 V(Max) η Efficiency VIN = 12V,ILOAD = 1A,VOUT = 5V 77 % (1) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Alllimitsareused to calculateAverageOutgoingQualityLevel,and allare100% productiontested. (2) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Allroom temperaturelimits are100% productiontested.Alllimitsattemperatureextremes arespecifiedviacorrelationusingstandardStatisticalQualityControl (SQC) methods. (3) Externalcomponents such as thecatchdiode,inductor,inputand outputcapacitorscan affectswitchingregulatorsystemperformance. When theLM1575/LM2575 isused as shown inthetestcircuitFigure25 and Figure26,systemperformancewillbe as shown insystem parametersofElectricalCharacteristics.

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS SpecificationswithstandardtypefaceareforTJ = 25°C, and thosewithboldfacetypeapplyoverfullOperating Temperature Range .Unlessotherwisespecified,VIN = 12V forthe3.3V,5V,and Adjustableversion,VIN = 25V forthe12V version,and VIN = 30V forthe15V version.ILOAD = 200 mA. LM2575-XXLM1575-XX UnitsLM2575HV-XXSymbol Parameter Conditions Typ (Limits) Limit(1) Limit(2) DEVICE PARAMETERS Ib Feedback BiasCurrent VOUT = 5V (AdjustableVersionOnly) 50 100/500 100/500 nA fO OscillatorFrequency See (3) 52 kHz 47/43 47/42 kHz(Min) 58/62 58/63 kHz(Max) VSAT SaturationVoltage IOUT = 1A (4) 0.9 V DC Max DutyCycle(ON) See (5) 98 % 93 93 %(Min) ICL CurrentLimit Peak Current(4)(3) 2.2 A IL OutputLeakage Output= 0V 2 2 mA(Max) Current Output= −1V 7.5 mAOutput= −1V (6)(7) 30 30 mA(Max) IQ QuiescentCurrent See (6) 5 mA 10/12 10 mA(Max) ISTBY StandbyQuiescent ON /OFF Pin= 5V (OFF) 50 μA Current 200/500 200 μA(Max) θJA ThermalResistance TO-220 Package,JunctiontoAmbient (8) 65 θJA TO-220 Package,JunctiontoAmbient (9) 45 θJC TO-220 Package,JunctiontoCase 2 θJA CDIP Package,JunctiontoAmbient (10) 85 °C/W θJA SOIC Package,JunctiontoAmbient (10) 100 θJA DDPAK/TO-263 Package,JunctiontoAmbient 37 (11) (1) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Alllimitsareused to calculateAverageOutgoingQualityLevel,and allare100% productiontested. (2) Alllimitsspecifiedatroom temperature(standardtypeface)and attemperatureextremes (boldtypeface).Allroom temperaturelimits are100% productiontested.Alllimitsattemperatureextremes arespecifiedviacorrelationusingstandardStatisticalQualityControl (SQC) methods. (3) The oscillatorfrequencyreducestoapproximately18 kHz intheeventofan outputshortoran overloadwhichcausestheregulated outputvoltagetodropapproximately40% fromthenominaloutputvoltage.Thisselfprotectionfeaturelowerstheaveragepower dissipationoftheIC by loweringtheminimum dutycyclefrom5% down toapproximately2%. (4) Output(pin2)sourcingcurrent.No diode,inductororcapacitorconnectedtooutputpin. (5) Feedback (pin4)removed fromoutputand connectedto0V. (6) Feedback (pin4)removed fromoutputand connectedto+12V fortheAdjustable,3.3V,and 5V versions,and +25V forthe12V and 15V versions,toforcetheoutputtransistorOFF. (7) VIN = 40V (60V forthehighvoltageversion). (8) Junctiontoambientthermalresistance(noexternalheatsink)forthe5 leadTO-220 package mounted vertically,with½ inchleadsina socket,oron a PC boardwithminimum copperarea. (9) Junctiontoambientthermalresistance(noexternalheatsink)forthe5 leadTO-220 package mounted vertically,with½ inchleads solderedtoa PC boardcontainingapproximately4 squareinchesofcopperareasurroundingtheleads. (10)Junctiontoambientthermalresistancewithapproximately1 squareinchofpc boardcoppersurroundingtheleads.Additionalcopper areawilllowerthermalresistancefurther.See thermalmodel inSwitchersmade Simplesoftware. (11)IftheDDPAK/TO-263 package isused,thethermalresistancecan be reducedby increasingthePC boardcopperareathermally connectedtothepackage:Using0.5squareinchesofcopperarea,θJA is50°C/W; with1 squareinchofcopperarea,θJA is37°C/W; and with1.6ormore squareinchesofcopperarea,θJA is32°C/W. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLinks:LM1575 LM2575-N LM2575HV

LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com ELECTRICAL CHARACTERISTICS ALL OUTPUT VOLTAGE VERSIONS (continued) SpecificationswithstandardtypefaceareforTJ = 25°C, and thosewithboldfacetypeapplyoverfullOperating Temperature Range .Unlessotherwisespecified,VIN = 12V forthe3.3V,5V,and Adjustableversion,VIN = 25V forthe12V version,and VIN = 30V forthe15V version.ILOAD = 200 mA. LM2575-XXLM1575-XX UnitsLM2575HV-XXSymbol Parameter Conditions Typ (Limits) Limit(1) Limit(2) ON /OFF CONTROL TestCircuitFigure25 and Figure26 IIH ON /OFF PinInput ON /OFF Pin= 5V (OFF) 12 μA Current 30 30 μA(Max) IIL ON /OFF Pin= 0V (ON) 0 μA 10 10 μA(Max)

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (CircuitFigure25 and Figure26) NormalizedOutput Voltage LineRegulation Figure9. Figure10. Dropout Voltage CurrentLimit Figure11. Figure12. Standby QuiescentCurrent QuiescentCurrent Figure13. Figure14. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLinks:LM1575 LM2575-N LM2575HV

LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) (CircuitFigure25 and Figure26) Switch Saturation OscillatorFrequency Voltage Figure15. Figure16. Efficiency Minimum OperatingVoltage Figure17. Figure18. QuiescentCurrent Feedback Voltage vs Duty Cycle vs Duty Cycle Figure19. Figure20.

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) (CircuitFigure25 and Figure26) Maximum Power Dissipation Feedback Pin Current (TO-263)(See (1)) Figure21. Figure22. SwitchingWaveforms Load TransientResponse VOUT = 5V A:OutputPinVoltage,10V/div B:OutputPinCurrent,1A/div C: InductorCurrent,0.5A/div D: OutputRippleVoltage,20 mV/div, AC-Coupled HorizontalTime Base: 5 μs/div Figure23. Figure24. (1) IftheDDPAK/TO-263 package isused,thethermalresistancecan be reducedby increasingthePC boardcopperareathermally connectedtothepackage:Using0.5squareinchesofcopperarea,θJA is50°C/W; with1 squareinchofcopperarea,θJA is37°C/W; and with1.6ormore squareinchesofcopperarea,θJA is32°C/W. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 11 ProductFolderLinks:LM1575 LM2575-N LM2575HV

LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com TEST CIRCUIT AND LAYOUT GUIDELINES As in any switchingregulator,layoutis very important.Rapidlyswitchingcurrentsassociatedwith wiring inductancegeneratevoltagetransientswhichcan cause problems.Forminimalinductanceand groundloops,the lengthof the leadsindicatedby heavy linesshouldbe keptas shortas possible.Single-pointgrounding(as indicated)or ground planeconstructionshouldbe used forbestresults.When usingthe Adjustableversion, physicallylocatetheprogrammingresistorsneartheregulator,tokeep thesensitivefeedbackwiringshort. C IN — 100 μF,75V,Aluminum Electrolytic C OUT — 330 μF,25V,Aluminum Electrolytic D1 — Schottky,11DQ06 L1 — 330 μH, PE-52627 (for5V in,3.3Vout,use 100 μH, PE-92108) Figure25. FixedOutput VoltageVersions where VREF = 1.23V,R1 between 1k and 5k. R1 — 2k,0.1% R2 — 6.12k,0.1% Pinnumbers arefortheTO-220 package. Figure26. AdjustableOutput VoltageVersion

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 LM2575 SeriesBuck RegulatorDesign Procedure PROCEDURE (FixedOutput VoltageVersions) EXAMPLE (FixedOutput VoltageVersions) Given: Given: VIN(Max)= Maximum InputVoltage VOUT = 5V VIN(Max)= 20VVOUT = RegulatedOutputVoltage(3.3V,5V,12V,or15V) ILOAD (Max)= 0.8AILOAD (Max)= Maximum Load Current 1.InductorSelection(L1) 1.InductorSelection(L1) A. SelectthecorrectInductorvalueselectionguidefrom Figure27, A. Use theselectionguideshown inFigure28. inductorcode forthatregion. C. Identifytheinductorvaluefrom theinductorcode,and selectan appropriateinductorfrom thetableshown inTable2.Partnumbers are listedforthreeinductormanufacturers.The inductorchosen must be ratedforoperationattheLM2575 switchingfrequency(52 kHz) and fora currentratingof1.15× ILOAD .For additionalinductor information,see INDUCTOR SELECTION . 2.Output CapacitorSelection(COUT ) 2.Output CapacitorSelection(COUT ) A. The value of the outputcapacitortogetherwith the inductorA. C OUT = 100 μF to470 μF standardaluminum electrolytic. definesthe dominatepole-pairof the switchingregulatorloop.For B. Capacitorvoltagerating= 20V.stable operation and an acceptable output ripple voltage, (approximately1% of the outputvoltage)a valuebetween 100 μF and 470 μF isrecommended. B. The capacitor'svoltageratingshouldbe atleast1.5timesgreater thantheoutputvoltage.For a 5V regulator,a ratingofatleast8V is appropriate,and a 10V or15V ratingisrecommended. Higher voltageelectrolyticcapacitorsgenerallyhave lower ESR numbers, and forthisreason itmay be necessary to selecta capacitorratedfora highervoltagethanwouldnormallybe needed. 3.Catch Diode Selection(D1) 3.Catch Diode Selection(D1) A. The catch-diodecurrentratingmust be atleast1.2timesgreaterA. Forthisexample,a 1A currentratingisadequate. than the maximum load current.Also,ifthe power supplydesign B. Use a 30V 1N5818 or SR103 Schottkydiode,or any of themust withstanda continuousoutputshort,thediodeshouldhave a suggestedfast-recoverydiodesshown inTable1.currentratingequaltothemaximum currentlimitoftheLM2575. The most stressfulconditionforthisdiode is an overloador shorted outputcondition. B. The reversevoltageratingof the diodeshouldbe at least1.25 timesthemaximum inputvoltage. 4.InputCapacitor(CIN) 4.InputCapacitor(CIN) An aluminum or tantalumelectrolyticbypass capacitorlocatedclose A 47 μF, 25V aluminum electrolyticcapacitorlocatednear theinput totheregulatorisneeded forstableoperation. and groundpinsprovidessufficientbypassing. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 13 ProductFolderLinks:LM1575 LM2575-N LM2575HV

LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com InductorValue SelectionGuides (ForContinuousMode Operation) Figure27.LM2575(HV)-3.3 Figure28.LM2575(HV)-5.0 Figure29.LM2575(HV)-12 Figure30.LM2575(HV)-15 Figure31.LM2575(HV)-ADJ

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 PROCEDURE (AdjustableOutput VoltageVersions) EXAMPLE (AdjustableOutput VoltageVersions) Given: Given: VOUT = RegulatedOutputVoltage VOUT = 10V VIN(Max)= Maximum InputVoltage VIN(Max)= 25V ILOAD (Max)= Maximum Load Current ILOAD (Max)= 1A F = SwitchingFrequency(Fixedat52 kHz) F = 52 kHz 1.Programming Output Voltage(SelectingR1 and R2, as shown 1.Programming Output Voltage(SelectingR1 and R2) inFigure25 and Figure26) Use thefollowingformulatoselecttheappropriateresistorvalues. (1) (3)R 1 can be between 1k and 5k.(Forbesttemperaturecoefficientand R2 = 1k (8.13− 1)= 7.13k,closest1% valueis7.15kstabilitywithtime,use 1% metalfilmresistors) (2) 2.InductorSelection(L1) 2.InductorSelection(L1) A. CalculatetheinductorVolt•microsecondconstant, A. CalculateE •T (V •μs) E •T (V •μs),fromthefollowingformula: (5) (4) B. E •T = 115 V •μs B. Use theE • T valuefrom thepreviousformulaand match itwith C. ILOAD (Max)= 1Athe E • T number on the verticalaxis of the Inductor Value D. InductanceRegion= H470SelectionGuide shown inFigure31. themaximum loadcurrentvalue,and notetheinductorcode forthat region. E. Identifytheinductorvaluefrom theinductorcode,and selectan appropriateinductorfrom thetableshown inTable2.Partnumbers are listedforthreeinductormanufacturers.The inductorchosen must be ratedforoperationattheLM2575 switchingfrequency(52 kHz) and fora currentratingof1.15× ILOAD .For additionalinductor information,see INDUCTOR SELECTION . 3.Output CapacitorSelection(COUT ) 3.Output CapacitorSelection(COUT ) A. The value of the outputcapacitortogetherwith the inductorA. definesthe dominatepole-pairof the switchingregulatorloop.For stable operation,the capacitor must satisfythe following (7)requirement: However,foracceptableoutputripplevoltageselect C OUT ≥ 220 μF(6) C OUT = 220 μF electrolyticcapacitorThe above formulayieldscapacitorvaluesbetween 10 μF and 2000 μF thatwillsatisfythelooprequirementsforstableoperation.But to achievean acceptableoutputripplevoltage,(approximately1% of theoutputvoltage)and transientresponse,theoutputcapacitormay need tobe severaltimeslargerthantheabove formulayields. B. The capacitor'svoltageratingshouldbe atlast1.5timesgreater thantheoutputvoltage.For a 10V regulator,a ratingofatleast15V ormore isrecommended. Higher voltageelectrolyticcapacitorsgenerallyhave lower ESR numbers, and forthisreason itmay be necessary to selecta capacitorratefora highervoltagethanwouldnormallybe needed. (Continued) (Continued) Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 15 ProductFolderLinks:LM1575 LM2575-N LM2575HV

LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com PROCEDURE (AdjustableOutput VoltageVersions) EXAMPLE (AdjustableOutput VoltageVersions) 4.Catch Diode Selection(D1) 4.Catch Diode Selection(D1) A. The catch-diodecurrentratingmust be atleast1.2timesgreaterA. Forthisexample,a 3A currentratingisadequate. than the maximum load current.Also,ifthe power supplydesign B. Use a 40V MBR340 or 31DQ04 Schottkydiode,or any of themust withstanda continuousoutputshort,thediodeshouldhave a suggestedfast-recoverydiodesinTable1.currentratingequaltothemaximum currentlimitoftheLM2575. The most stressfulconditionforthisdiode is an overloador shorted output.See Table1. B. The reversevoltageratingof the diodeshouldbe at least1.25 timesthemaximum inputvoltage. 5.InputCapacitor(CIN) 5.InputCapacitor(CIN) An aluminum or tantalumelectrolyticbypass capacitorlocatedclose A 100 μF aluminum electrolyticcapacitorlocatednear theinputand totheregulatorisneeded forstableoperation. groundpinsprovidessufficientbypassing. To furthersimplifythebuck regulatordesignprocedure,TI ismaking availablecomputerdesignsoftwaretobe used withtheSimpleSwitcherlineofswitchingregulators.SwitchersMade Simple (version3.3)isavailableon a (3½ ″)disketteforIBM compatiblecomputersfroma TIsalesofficeinyourarea. Table1.Diode SelectionGuide Schottky FastRecovery VR 1A 3A 1A 3A 20V 1N5817 1N5820 MBR120P MBR320 The following The followingSR102 SR302 diodesareall diodesareall30V 1N5818 1N5821 MBR130P MBR330 ratedto100V: ratedto100V:11DQ03 31DQ03 11DF1 31DF1SR103 SR303 MUR110 MURD310 HER102 HER302 40V 1N5819 IN5822 MBR140P MBR340 11DQ04 31DQ04 SR104 SR304 50V MBR150 MBR350 11DQ05 31DQ05 SR105 SR305 60V MBR160 MBR360 11DQ06 31DQ06 SR106 SR306 Table2.InductorSelectionby Manufacturer's PartNumber InductorCode InductorValue Schott (1) Pulse Eng. (2) Renco (3) L100 100 μH 67127000 PE-92108 RL2444 L150 150 μH 67127010 PE-53113 RL1954 L220 220 μH 67127020 PE-52626 RL1953 L330 330 μH 67127030 PE-52627 RL1952 L470 470 μH 67127040 PE-53114 RL1951 L680 680 μH 67127050 PE-52629 RL1950 H150 150 μH 67127060 PE-53115 RL2445 H220 220 μH 67127070 PE-53116 RL2446 H330 330 μH 67127080 PE-53117 RL2447 H470 470 μH 67127090 PE-53118 RL1961 H680 680 μH 67127100 PE-53119 RL1960 H1000 1000 μH 67127110 PE-53120 RL1959 (1) SchottCorp.,(612)475-1173,1000 ParkersLake Rd.,Wayzata,MN 55391. (2) PulseEngineering,(619)674-8100,P.O.Box 12236,San Diego,CA 92112. (3) Renco ElectronicsInc.,(516)586-5566,60 JeffrynBlvd.East,Deer Park,NY 11729.

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 Table2.InductorSelectionby Manufacturer's PartNumber (continued) InductorCode InductorValue Schott (1) Pulse Eng. (2) Renco (3) H1500 1500 μH 67127120 PE-53121 RL1958 H2200 2200 μH 67127130 PE-53122 RL2448 APPLICATION HINTS INPUT CAPACITOR (CIN) To maintainstability,theregulatorinputpinmust be bypassed withatleasta 47 μF electrolyticcapacitor.The capacitor'sleadsmust be keptshort,and locatedneartheregulator. Iftheoperatingtemperaturerangeincludestemperaturesbelow−25°C, theinputcapacitorvaluemay need tobe larger.With most electrolyticcapacitors,the capacitancevaluedecreasesand the ESR increaseswithlower temperaturesand age.Parallelinga ceramicorsolidtantalumcapacitorwillincreasetheregulatorstabilityatcold temperatures.For maximum capacitoroperatinglifetime,the capacitor'sRMS ripplecurrentratingshouldbe greaterthan (8) INDUCTOR SELECTION Allswitchingregulatorshave two basicmodes of operation:continuousand discontinuous.The difference between thetwo typesrelatestotheinductorcurrent,whetheritisflowingcontinuously,orifitdropstozerofora periodof time in the normal switchingcycle.Each mode has distinctivelydifferentoperatingcharacteristics, whichcan affecttheregulatorperformanceand requirements. The LM2575 (orany oftheSimpleSwitcherfamily)can be used forbothcontinuousand discontinuousmodes of operation. The inductorvalueselectionguidesinFigure27 throughFigure31 were designedforbuck regulatordesignsof the continuousinductorcurrenttype.When usinginductorvaluesshown in the inductorselectionguide,the peak-to-peakinductorripplecurrentwillbe approximately20% to 30% of the maximum DC current.With relativelyheavy loadcurrents,thecircuitoperatesinthecontinuousmode (inductorcurrentalwaysflowing),but underlightloadconditions,thecircuitwillbe forcedtothediscontinuousmode (inductorcurrentfallstozerofora periodof time).This discontinuousmode of operationis perfectlyacceptable.For lightloads (lessthan approximately200 mA) itmay be desirabletooperatetheregulatorinthediscontinuousmode, primarilybecause ofthelowerinductorvaluesrequiredforthediscontinuousmode. The selectionguidechooses inductorvaluessuitableforcontinuousmode operation,but ifthe inductorvalue chosen is prohibitivelyhigh,the designershould investigatethe possibilityof discontinuousoperation.The computerdesignsoftwareSwitchersMade Simple willprovideallcomponent valuesfordiscontinuous(aswell as continuous)mode ofoperation. Inductorsareavailableindifferentstylessuch as potcore,toriod,E-frame,bobbincore,etc.,as wellas different corematerials,such as ferritesand powdered iron.The leastexpensive,thebobbincoretype,consistsofwire wrapped on a ferriterod core.This type of constructionmakes foran inexpensiveinductor,but sincethe magneticfluxisnotcompletelycontainedwithinthecore,itgeneratesmore electromagneticinterference(EMI). ThisEMI can cause problemsinsensitivecircuits,or can giveincorrectscope readingsbecause of induced voltagesinthescope probe. The inductorslistedintheselectionchartincludeferritepotcoreconstructionforAIE,powdered irontoroidfor PulseEngineering,and ferritebobbincoreforRenco. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 17 ProductFolderLinks:LM1575 LM2575-N LM2575HV

LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com An inductorshouldnot be operatedbeyond itsmaximum ratedcurrentbecause itmay saturate.When an inductorbeginstosaturate,theinductancedecreasesrapidlyand theinductorbeginstolookmainlyresistive(the DC resistanceofthewinding).Thiswillcause theswitchcurrenttoriseveryrapidly.Differentinductortypeshave differentsaturationcharacteristics,and thisshouldbe keptinmind when selectingan inductor. The inductormanufacturer'sdatasheetsincludecurrentand energylimitstoavoidinductorsaturation. INDUCTOR RIPPLE CURRENT When theswitcherisoperatinginthecontinuousmode, theinductorcurrentwaveform rangesfroma triangular toa sawtoothtypeofwaveform (dependingon theinputvoltage).For a giveninputvoltageand outputvoltage, thepeak-to-peakamplitudeofthisinductorcurrentwaveform remainsconstant.As theloadcurrentrisesorfalls, theentiresawtoothcurrentwaveform alsorisesorfalls.The averageDC valueofthiswaveform isequaltothe DC loadcurrent(inthebuck regulatorconfiguration). Iftheloadcurrentdropstoa low enough level,thebottomofthesawtoothcurrentwaveform willreachzero,and theswitcherwillchange toa discontinuousmode ofoperation.Thisisa perfectlyacceptablemode ofoperation. Any buck switchingregulator(nomatterhow largetheinductorvalueis)willbe forcedtorundiscontinuousifthe loadcurrentislightenough. OUTPUT CAPACITOR An outputcapacitorisrequiredtofiltertheoutputvoltageand isneeded forloopstability.The capacitorshould be locatedneartheLM2575 usingshortpc boardtraces.Standardaluminum electrolyticsareusuallyadequate, butlow ESR typesare recommended forlow outputripplevoltageand good stability.The ESR ofa capacitor depends on many factors,some which are:the value,the voltagerating,physicalsize and the type of construction.Ingeneral,low valueorlow voltage(lessthan12V) electrolyticcapacitorsusuallyhave higherESR numbers. The amount of outputripplevoltageisprimarilya functionof the ESR (EquivalentSeriesResistance)of the outputcapacitorand theamplitudeoftheinductorripplecurrent(ΔIIND).(See INDUCTOR RIPPLE CURRENT ). The lowercapacitorvalues(220μF–680 μF) willallowtypically50 mV to150 mV ofoutputripplevoltage,while larger-valuecapacitorswillreducetherippletoapproximately20 mV to50 mV. OutputRippleVoltage= (ΔIIND)(ESR ofC OUT ) (9) To furtherreduce the outputripplevoltage,severalstandardelectrolyticcapacitorsmay be paralleled,or a higher-gradecapacitormay be used. Such capacitorsare oftencalled“high-frequency,” “low-inductance,” or “low-ESR.” These willreducetheoutputrippleto10 mV or 20 mV. However, when operatinginthecontinuous mode, reducingtheESR below0.05Ω can cause instabilityintheregulator. Tantalumcapacitorscan have a verylowESR, and shouldbe carefullyevaluatedifitistheonlyoutputcapacitor. Because of theirgood low temperaturecharacteristics,a tantalumcan be used in parallelwithaluminum electrolytics,withthetantalummaking up 10% or20% ofthetotalcapacitance. The capacitor'sripplecurrentratingat 52 kHz shouldbe at least50% higherthan the peak-to-peakinductor ripplecurrent. CATCH DIODE Buck regulatorsrequirea diodetoprovidea returnpathfortheinductorcurrentwhen theswitchisoff.Thisdiode shouldbe locatedclosetotheLM2575 usingshortleadsand shortprintedcircuittraces. Because oftheirfastswitchingspeed and low forwardvoltagedrop,Schottkydiodesprovidethebestefficiency, especiallyinlow outputvoltageswitchingregulators(lessthan5V).Fast-Recovery,High-Efficiency,orUltra-Fast Recoverydiodesarealsosuitable,butsome typeswithan abruptturn-offcharacteristicmay cause instabilityand EMI problems.A fast-recoverydiodewithsoftrecoverycharacteristicsisa betterchoice.Standard60 Hz diodes (example:1N4001 or 1N5400, and so on.)are alsonot suitable.See Table 1 forSchottkyand “soft” fast- recoverydiodeselectionguide.

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 OUTPUT VOLTAGE RIPPLE AND TRANSIENTS The outputvoltageofa switchingpower supplywillcontaina sawtoothripplevoltageattheswitcherfrequency, typicallyabout1% oftheoutputvoltage,and may alsocontainshortvoltagespikesatthepeaks ofthesawtooth waveform. The outputripplevoltageisdue mainlytotheinductorsawtoothripplecurrentmultipliedby theESR oftheoutput capacitor.(See INDUCTOR SELECTION ) The voltagespikesare presentbecause of the fastswitchingactionof the outputswitch,and the parasitic inductanceoftheoutputfiltercapacitor.To minimizethesevoltagespikes,speciallow inductancecapacitorscan be used,and theirleadlengthsmust be keptshort.Wiringinductance,straycapacitance,as wellas thescope probeused toevaluatethesetransients,allcontributetotheamplitudeofthesespikes. An additionalsmallLC filter(20 μH & 100 μF) can be added totheoutput(asshown inFigure37) tofurther reduce the amount of outputrippleand transients.A 10 × reductioninoutputripplevoltageand transientsis possiblewiththisfilter. FEEDBACK CONNECTION The LM2575 (fixedvoltageversions)feedbackpinmust be wiredto the outputvoltagepointof the switching power supply.When usingtheadjustableversion,physicallylocatebothoutputvoltageprogramming resistors neartheLM2575 toavoidpickingup unwanted noise.Avoidusingresistorsgreaterthan100 kΩ because ofthe increasedchance ofnoisepickup. ON /OFF INPUT For normal operation,the ON /OFF pinshouldbe grounded or drivenwitha low-levelTTL voltage(typically below 1.6V).To puttheregulatorintostandbymode, drivethispinwitha high-levelTTL or CMOS signal.The ON /OFF pincan be safelypulledup to+VIN withouta resistorinserieswithit.The ON /OFF pinshouldnotbe leftopen. GROUNDING To maintainoutputvoltagestability,thepower groundconnectionsmust be low-impedance(seeFigure26).For theTO-3 stylepackage,thecase isground.For the5-leadTO-220 stylepackage,boththetaband pin3 are groundand eitherconnectionmay be used,as theyarebothpartofthesame copperleadframe. With the CDIP or SOIC packages,allthe pins labeledground,power ground,or signalground should be soldereddirectlytowide printedcircuitboardcoppertraces.Thisassuresbothlow inductanceconnectionsand good thermalproperties. HEAT SINK/THERMAL CONSIDERATIONS Inmany cases,no heatsinkisrequiredtokeep theLM2575 junctiontemperaturewithintheallowedoperating range.For each application,to determinewhetheror not a heat sinkwillbe required,the followingmust be identified: 1. Maximum ambienttemperature(intheapplication). 2. Maximum regulatorpower dissipation(inapplication). 3. Maximum allowedjunctiontemperature(150°C forthe LM1575 or 125°C forthe LM2575). For a safe, conservativedesign,a temperatureapproximately15°C coolerthan the maximum temperatureshouldbe selected. 4. LM2575 package thermalresistancesθJA and θJC. Totalpower dissipatedby theLM2575 can be estimatedas follows: PD = (VIN)(IQ )+ (VO /VIN)(ILOAD )(VSAT ) where

• IQ (quiescentcurrent)and VSAT can be foundintheCharacteristicCurvesshown previously,
• VIN istheappliedminimum inputvoltage,
• VO istheregulatedoutputvoltage
• and ILOAD istheloadcurrent. (10) Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 19 ProductFolderLinks:LM1575 LM2575-N LM2575HV

LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com The dynamiclossesduringturn-onand turn-offarenegligibleifa Schottkytypecatchdiodeisused. When no heatsinkisused,thejunctiontemperaturerisecan be determinedby thefollowing: ΔTJ = (PD )(θJA) (11) To arriveattheactualoperatingjunctiontemperature,add thejunctiontemperaturerisetothemaximum ambient temperature. TJ = ΔTJ + TA (12) Ifthe actualoperatingjunctiontemperatureisgreaterthan the selectedsafe operatingjunctiontemperature determinedinstep3,thena heatsinkisrequired. When usinga heatsink,thejunctiontemperaturerisecan be determinedby thefollowing: ΔTJ = (PD )(θJC + θinterface+ θHeat sink) (13) The operatingjunctiontemperaturewillbe: TJ = TA + ΔTJ (14) As shown inEquation14,iftheactualoperatingjunctiontemperatureisgreaterthantheselectedsafeoperating junctiontemperature,thena largerheatsinkisrequired(onethathas a lowerthermalresistance). When usingtheLM2575 intheplasticCDIP orsurfacemount SOIC packages,severalitemsaboutthethermal propertiesof the packages shouldbe understood.The majorityof the heat isconductedout of the package throughtheleads,witha minorportionthroughtheplasticpartsofthepackage.Sincetheleadframe issolid copper,heat from the dieisreadilyconductedthroughthe leadsto the printedcircuitboard copper,which is actingas a heatsink. For bestthermalperformance,the ground pinsand allthe unconnectedpinsshouldbe solderedto generous amounts ofprintedcircuitboardcopper,such as a groundplane.Largeareasofcopperprovidethebesttransfer ofheattothesurroundingair.Copper on bothsidesoftheboardisalsohelpfulingettingtheheataway fromthe package,even ifthereisno directcoppercontactbetween thetwo sides.Thermalresistancenumbers as low as 40°C/W fortheSOIC package,and 30°C/W fortheCDIP package can be realizedwitha carefullyengineeredpc board. Includedon theSwitchersMade Simple designsoftwareisa more precise(non-linear)thermalmodel thatcan be used todeterminejunctiontemperaturewithdifferentinput-outputparametersordifferentcomponent values. Itcan alsocalculatethe heat sinkthermalresistancerequiredto maintainthe regulatorsjunctiontemperature belowthemaximum operatingtemperature. ADDITIONAL APPLICATIONS INVERTING REGULATOR Figure32 shows a LM2575-12 ina buck-boostconfigurationtogeneratea negative12V outputfrom a positive inputvoltage.Thiscircuitbootstrapstheregulator'sgroundpintothenegativeoutputvoltage,thenby grounding thefeedbackpin,theregulatorsensestheinvertedoutputvoltageand regulatesitto−12V. For an inputvoltageof12V ormore,themaximum availableoutputcurrentinthisconfigurationisapproximately 0.35A.Atlighterloads,theminimum inputvoltagerequireddropstoapproximately4.7V. The switchcurrentsinthisbuck-boostconfigurationare higherthan inthe standardbuck-mode design,thus loweringtheavailableoutputcurrent.Also,thestart-upinputcurrentofthebuck-boostconverterishigherthan thestandardbuck-mode regulator,and thismay overloadan inputpower sourcewitha currentlimitlessthan 1.5A. Using a delayed turn-onor an undervoltagelockoutcircuit(describedin the NEGATIVE BOOST REGULATOR section)would allowtheinputvoltagetorisetoa highenough levelbeforetheswitcherwould be allowedtoturnon. Because of the structuraldifferencesbetween the buck and the buck-boostregulatortopologies,the buck regulatordesign procedure sectioncannot be used to selectthe inductoror the outputcapacitor.The recommended rangeofinductorvaluesforthebuck-boostdesignisbetween 68 μH and 220 μH, and theoutput capacitorvaluesmust be largerthan what isnormallyrequiredforbuck designs.Low inputvoltagesor high outputcurrentsrequirea largevalueoutputcapacitor(inthethousandsofmicroFarads).

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 The peak inductorcurrent,which isthesame as thepeak switchcurrent,can be calculatedfrom thefollowing formula: where

• fosc = 52 kHz. (15) Under normal continuousinductorcurrentoperatingconditions,the minimum VIN representsthe worstcase. Selectan inductorthatisratedforthepeak currentanticipated. Also,themaximum voltageappearingacrosstheregulatoristheabsolutesum oftheinputand outputvoltage. Fora −12V output,themaximum inputvoltagefortheLM2575 is+28V, or+48V fortheLM2575HV. The SwitchersMade Simple (version3.3)designsoftwarecan be used todeterminethefeasibilityofregulator designsusingdifferenttopologies,differentinput-outputparameters,differentcomponents,and so on. Figure32. InvertingBuck-Boost Develops −12V NEGATIVE BOOST REGULATOR Anothervariationon thebuck-boosttopologyisthenegativeboostconfiguration.The circuitinFigure33 accepts an inputvoltagerangingfrom −5V to−12V and providesa regulated−12V output.Inputvoltagesgreaterthan −12V willcause theoutputtoriseabove −12V,butwillnotdamage theregulator. Because oftheboostingfunctionofthistypeofregulator,theswitchcurrentisrelativelyhigh,especiallyatlow inputvoltages.Outputloadcurrentlimitationsare a resultof the maximum currentratingof the switch.Also, boostregulatorscan notprovidecurrentlimitingloadprotectionintheeventofa shortedload,so some other means (suchas a fuse)may be necessary. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 21 ProductFolderLinks:LM1575 LM2575-N LM2575HV

+ 1N5817 + C OUT 1000 PF Feedback Output VIN C IN 100 PF GND 150 PH VOUT = -12V -VIN -5V to -12V Low ESR ON/OFF LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com TypicalLoad Current 200 mA forVIN = −5.2V 500 mA forVIN = −7V Pinnumbers areforTO-220 package. Figure33. NegativeBoost UNDERVOLTAGE LOCKOUT Insome applicationsitisdesirabletokeep theregulatoroffuntiltheinputvoltagereachesa certainthreshold.An undervoltagelockoutcircuitwhichaccomplishesthistaskisshown inFigure34,whileFigure35 shows thesame circuitappliedtoa buck-boostconfiguration.These circuitskeep theregulatoroffuntiltheinputvoltagereaches a predeterminedlevel. VTH ≈ VZ1 + 2VBE (Q1) (16) DELAYED STARTUP The ON /OFF pincan be used toprovidea delayedstartupfeatureas shown inFigure36.Withan inputvoltage of20V and forthepartvaluesshown, thecircuitprovidesapproximately10 ms ofdelaytimebeforethecircuit beginsswitching.IncreasingtheRC timeconstantcan providelongerdelaytimes.But excessivelylargeRC time constantscan cause problemswithinputvoltagesthatarehighin60 Hz or120 Hz ripple,by couplingtheripple intotheON /OFF pin. ADJUSTABLE OUTPUT, LOW-RIPPLE POWER SUPPLY A 1A power supplythatfeaturesan adjustableoutputvoltageisshown inFigure37.An additionalL-C filterthat reducestheoutputrippleby a factorof10 ormore isincludedinthiscircuit.

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 Completecircuitnotshown. Pinnumbers arefortheTO-220 package. Figure34. UndervoltageLockout forBuck Circuit Completecircuitnotshown (seeFigure32). Pinnumbers arefortheTO-220 package. Figure35. UndervoltageLockout forBuck-Boost Circuit Completecircuitnotshown. Pinnumbers arefortheTO-220 package. Figure36. Delayed Startup Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 23 ProductFolderLinks:LM1575 LM2575-N LM2575HV

LM1575,LM2575-N,LM2575HV SNVS106E –MAY 1999–REVISED APRIL 2013 www.ti.com Pinnumbers arefortheTO-220 package. Figure37. 1.2Vto55V Adjustable1A Power Supply withLow Output Ripple DefinitionofTerms BUCK REGULATOR A switchingregulatortopologyinwhicha highervoltageisconvertedtoa lowervoltage. Alsoknown as a step-downswitchingregulator. BUCK-BOOST REGULATOR A switchingregulatortopologyinwhicha positivevoltageisconvertedtoa negativevoltagewithouta transformer. DUTY CYCLE (D)Ratiooftheoutputswitch'son-timetotheoscillatorperiod. (17) CATCH DIODE OR CURRENT STEERING DIODE The diodewhichprovidesa returnpathfortheloadcurrent when theLM2575 switchisOFF. EFFICIENCY (η)The proportionofinputpower actuallydeliveredtotheload. (18) CAPACITOR EQUIVALENT SERIES RESISTANCE (ESR)The purelyresistivecomponent ofa realcapacitor's impedance (seeFigure38).Itcausespower lossresultingincapacitorheating,whichdirectlyaffectsthe capacitor'soperatinglifetime.When used as a switchingregulatoroutputfilter,higherESR valuesresultin higheroutputripplevoltages. Figure38. Simple Model ofa Real Capacitor Most standardaluminum electrolyticcapacitorsinthe100 μF–1000 μF rangehave 0.5Ω to 0.1Ω ESR. Higher-gradecapacitors(“low-ESR”,“high-frequency”,or“low-inductance”')inthe 100 μF–1000 μF rangegenerallyhave ESR oflessthan0.15Ω. EQUIVALENT SERIES INDUCTANCE (ESL)The pureinductancecomponent ofa capacitor(seeFigure38). The amount ofinductanceisdeterminedtoa largeextenton thecapacitor'sconstruction.Ina buck regulator,thisunwanted inductancecausesvoltagespikestoappearon theoutput. OUTPUT RIPPLE VOLTAGE The AC component oftheswitchingregulator'soutputvoltage.Itisusually dominatedby theoutputcapacitor'sESR multipliedby theinductor'sripplecurrent(ΔIIND).The peak-to- peak valueofthissawtoothripplecurrentcan be determinedby readingINDUCTOR RIPPLE CURRENT .

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LM1575,LM2575-N,LM2575HV www.ti.com SNVS106E –MAY 1999–REVISED APRIL 2013 CAPACITOR RIPPLE CURRENT RMS valueofthemaximum allowablealternatingcurrentatwhicha capacitor can be operatedcontinuouslyata specifiedtemperature. STANDBY QUIESCENT CURRENT (ISTBY )Supplycurrentrequiredby theLM2575 when inthestandbymode (ON /OFF pinisdriventoTTL-highvoltage,thusturningtheoutputswitchOFF). INDUCTOR RIPPLE CURRENT (ΔIIND)The peak-to-peakvalueoftheinductorcurrentwaveform,typicallya sawtoothwaveform when theregulatorisoperatinginthecontinuousmode (vs.discontinuousmode). CONTINUOUS/DISCONTINUOUS MODE OPERATION Relatestotheinductorcurrent.Inthecontinuousmode, theinductorcurrentisalwaysflowingand neverdropstozero,vs.thediscontinuousmode, where the inductorcurrentdropstozerofora periodoftimeinthenormalswitchingcycle. INDUCTOR SATURATION The conditionwhichexistswhen an inductorcannotholdany more magneticflux. When an inductorsaturates,theinductorappearslessinductiveand theresistivecomponent dominates. Inductorcurrentisthenlimitedonlyby theDC resistanceofthewireand theavailablesourcecurrent. OPERATING VOLT MICROSECOND CONSTANT (E•Top)The product(inVoIt•μs)ofthevoltageappliedtothe inductorand thetimethevoltageisapplied.ThisE•Top constantisa measure oftheenergyhandling capabilityofan inductorand isdependentupon thetypeofcore,thecorearea,thenumber ofturns,and thedutycycle. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 25 ProductFolderLinks:LM1575 LM2575-N LM2575HV

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REVISION HISTORY

Changes from RevisionD (April2013)toRevisionE Page

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www.ti.com 11-Apr-2013 Addendum-Page 1 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3) Op Temp (°C) Top-Side Markings (4) Samples LM2575HVMX-5.0 ACTIVE SOIC DW 24 1000 TBD Call TI Call TI -40 to 125 LM2575HVM -5.0 P+ LM2575HVMX-5.0/NOPB ACTIVE SOIC DW 24 1000 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 LM2575HVM -5.0 P+ LM2575HVN-5.0 ACTIVE PDIP NBG 16 20 TBD Call TI Call TI -40 to 125 LM2575HVN -5.0 P+ LM2575HVN-5.0/NOPB ACTIVE PDIP NBG 16 20 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575HVN -5.0 P+ LM2575HVN-ADJ ACTIVE PDIP NBG 16 20 TBD Call TI Call TI -40 to 125 LM2575HVN -ADJ P+ LM2575HVN-ADJ/NOPB ACTIVE PDIP NBG 16 20 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575HVN -ADJ P+ LM2575HVS-12 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2575HVS -12 P+ LM2575HVS-12/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575HVS -12 P+ LM2575HVS-15 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2575HVS -15 P+ LM2575HVS-15/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575HVS -15 P+ LM2575HVS-3.3 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2575HVS -3.3 P+ LM2575HVS-3.3/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575HVS -3.3 P+ LM2575HVS-5.0 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2575HVS -5.0 P+ LM2575HVS-5.0/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575HVS -5.0 P+ LM2575HVS-ADJ ACTIVE DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2575HVS -ADJ P+ LM2575HVS-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575HVS -ADJ P+ LM2575HVSX-15 ACTIVE DDPAK/ TO-263 KTT 5 500 TBD Call TI Call TI -40 to 125 LM2575HVS -15 P+

www.ti.com 11-Apr-2013 Addendum-Page 2 Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3) Op Temp (°C) Top-Side Markings (4) Samples LM2575HVSX-15/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575HVS -15 P+ LM2575HVSX-3.3 ACTIVE DDPAK/ TO-263 KTT 5 500 TBD Call TI Call TI -40 to 125 LM2575HVS -3.3 P+ LM2575HVSX-3.3/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575HVS -3.3 P+ LM2575HVSX-5.0 ACTIVE DDPAK/ TO-263 KTT 5 500 TBD Call TI Call TI -40 to 125 LM2575HVS -5.0 P+ LM2575HVSX-5.0/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575HVS -5.0 P+ LM2575HVSX-ADJ ACTIVE DDPAK/ TO-263 KTT 5 500 TBD Call TI Call TI -40 to 125 LM2575HVS -ADJ P+ LM2575HVSX-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575HVS -ADJ P+ LM2575HVT-12 ACTIVE TO-220 KC 5 45 TBD Call TI Call TI -40 to 125 LM2575HVT -12 P+ LM2575HVT-12/LB03 ACTIVE TO-220 NDH 5 45 TBD Call TI Call TI LM2575HVT -12 P+ LM2575HVT-12/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575HVT -12 P+ LM2575HVT-12/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575HVT -12 P+ LM2575HVT-15 ACTIVE TO-220 KC 5 45 TBD Call TI Call TI -40 to 125 LM2575HVT -15 P+ LM2575HVT-15/LB03 ACTIVE TO-220 NDH 5 45 TBD Call TI Call TI LM2575HVT -15 P+ LM2575HVT-15/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575HVT -15 P+ LM2575HVT-15/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575HVT -15 P+ LM2575HVT-3.3 ACTIVE TO-220 KC 5 45 TBD Call TI Call TI -40 to 125 LM2575HVT -3.3 P+ LM2575HVT-3.3/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575HVT -3.3 P+ LM2575HVT-3.3/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575HVT -3.3 P+

www.ti.com 11-Apr-2013 Addendum-Page 3 Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3) Op Temp (°C) Top-Side Markings (4) Samples LM2575HVT-5.0 ACTIVE TO-220 KC 5 45 TBD Call TI Call TI -40 to 125 LM2575HVT -5.0 P+ LM2575HVT-5.0/LB03 ACTIVE TO-220 NDH 5 45 TBD Call TI Call TI LM2575HVT -5.0 P+ LM2575HVT-5.0/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575HVT -5.0 P+ LM2575HVT-5.0/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575HVT -5.0 P+ LM2575HVT-ADJ ACTIVE TO-220 KC 5 45 TBD Call TI Call TI -40 to 125 LM2575HVT -ADJ P+ LM2575HVT-ADJ/LB03 ACTIVE TO-220 NDH 5 45 TBD Call TI Call TI LM2575HVT -ADJ P+ LM2575HVT-ADJ/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575HVT -ADJ P+ LM2575HVT-ADJ/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575HVT -ADJ P+ LM2575M-5.0 ACTIVE SOIC DW 24 30 TBD Call TI Call TI -40 to 125 LM2575M -5.0 P+ LM2575M-5.0/NOPB ACTIVE SOIC DW 24 30 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 LM2575M -5.0 P+ LM2575M-ADJ ACTIVE SOIC DW 24 30 TBD Call TI Call TI -40 to 125 LM2575M -ADJ P+ LM2575M-ADJ/NOPB ACTIVE SOIC DW 24 30 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 LM2575M -ADJ P+ LM2575MX-5.0 ACTIVE SOIC DW 24 1000 TBD Call TI Call TI -40 to 125 LM2575M -5.0 P+ LM2575MX-5.0/NOPB ACTIVE SOIC DW 24 1000 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 LM2575M -5.0 P+ LM2575MX-ADJ ACTIVE SOIC DW 24 1000 TBD Call TI Call TI -40 to 125 LM2575M -ADJ P+ LM2575MX-ADJ/NOPB ACTIVE SOIC DW 24 1000 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 LM2575M -ADJ P+ LM2575N-5.0 ACTIVE PDIP NBG 16 20 TBD Call TI Call TI -40 to 125 LM2575N -5.0 P+ LM2575N-5.0/NOPB ACTIVE PDIP NBG 16 20 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575N -5.0 P+

www.ti.com 11-Apr-2013 Addendum-Page 4 Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3) Op Temp (°C) Top-Side Markings (4) Samples LM2575N-ADJ ACTIVE PDIP NBG 16 20 TBD Call TI Call TI -40 to 125 LM2575N -ADJ P+ LM2575N-ADJ/NOPB ACTIVE PDIP NBG 16 20 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575N -ADJ P+ LM2575S-12 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2575S -12 P+ LM2575S-12/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575S -12 P+ LM2575S-15 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2575S -15 P+ LM2575S-15/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575S -15 P+ LM2575S-3.3 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2575S -3.3 P+ LM2575S-3.3/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575S -3.3 P+ LM2575S-5.0 ACTIVE DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2575S -5.0 P+ LM2575S-5.0/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575S -5.0 P+ LM2575S-ADJ ACTIVE DDPAK/ TO-263 KTT 5 45 TBD Call TI Call TI -40 to 125 LM2575S -ADJ P+ LM2575S-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTT 5 45 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575S -ADJ P+ LM2575SX-12 ACTIVE DDPAK/ TO-263 KTT 5 500 TBD Call TI Call TI -40 to 125 LM2575S -12 P+ LM2575SX-12/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575S -12 P+ LM2575SX-15 ACTIVE DDPAK/ TO-263 KTT 5 500 TBD Call TI Call TI -40 to 125 LM2575S -15 P+ LM2575SX-15/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575S -15 P+ LM2575SX-3.3 ACTIVE DDPAK/ TO-263 KTT 5 500 TBD Call TI Call TI -40 to 125 LM2575S -3.3 P+ LM2575SX-3.3/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575S -3.3 P+

www.ti.com 11-Apr-2013 Addendum-Page 5 Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3) Op Temp (°C) Top-Side Markings (4) Samples LM2575SX-5.0 ACTIVE DDPAK/ TO-263 KTT 5 500 TBD Call TI Call TI -40 to 125 LM2575S -5.0 P+ LM2575SX-5.0/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575S -5.0 P+ LM2575SX-ADJ ACTIVE DDPAK/ TO-263 KTT 5 500 TBD Call TI Call TI -40 to 125 LM2575S -ADJ P+ LM2575SX-ADJ/NOPB ACTIVE DDPAK/ TO-263 KTT 5 500 Pb-Free (RoHS Exempt) CU SN Level-3-245C-168 HR -40 to 125 LM2575S -ADJ P+ LM2575T-12 ACTIVE TO-220 KC 5 45 TBD Call TI Call TI -40 to 125 LM2575T -12 P+ LM2575T-12/LB03 ACTIVE TO-220 NDH 5 45 TBD Call TI Call TI LM2575T -12 P+ LM2575T-12/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575T -12 P+ LM2575T-12/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575T -12 P+ LM2575T-15 ACTIVE TO-220 KC 5 45 TBD Call TI Call TI -40 to 125 LM2575T -15 P+ LM2575T-15/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575T -15 P+ LM2575T-15/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575T -15 P+ LM2575T-3.3 ACTIVE TO-220 KC 5 45 TBD Call TI Call TI -40 to 125 LM2575T -3.3 P+ LM2575T-3.3/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575T -3.3 P+ LM2575T-3.3/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575T -3.3 P+ LM2575T-5.0 ACTIVE TO-220 KC 5 45 TBD Call TI Call TI -40 to 125 LM2575T -5.0 P+ LM2575T-5.0/LB03 ACTIVE TO-220 NDH 5 45 TBD Call TI Call TI LM2575T -5.0 P+ LM2575T-5.0/LF02 ACTIVE TO-220 NEB 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575T -5.0 P+ LM2575T-5.0/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575T -5.0 P+

www.ti.com 11-Apr-2013 Addendum-Page 6 Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3) Op Temp (°C) Top-Side Markings (4) Samples LM2575T-5.0/LF04 ACTIVE TO-220 NEB 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575T -5.0 P+ LM2575T-5.0/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575T -5.0 P+ LM2575T-ADJ ACTIVE TO-220 KC 5 45 TBD Call TI Call TI -40 to 125 LM2575T -ADJ P+ LM2575T-ADJ/LB03 ACTIVE TO-220 NDH 5 45 TBD Call TI Call TI LM2575T -ADJ P+ LM2575T-ADJ/LF02 ACTIVE TO-220 NEB 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575T -ADJ P+ LM2575T-ADJ/LF03 ACTIVE TO-220 NDH 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM LM2575T -ADJ P+ LM2575T-ADJ/NOPB ACTIVE TO-220 KC 5 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM -40 to 125 LM2575T -ADJ 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) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side 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 Top-Side Marking for that device.

www.ti.com 11-Apr-2013 Addendum-Page 7 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.

*All dimensions are nominal Device Package Type Package Drawing Pins SPQ Reel Diameter (mm) Reel Width W1 (mm) (mm) (mm) (mm) (mm) W (mm) Pin1 Quadrant LM2575HVSX-15 DDPAK/ TO-263 LM2575HVSX-15/NOPB DDPAK/ TO-263 LM2575HVSX-3.3 DDPAK/ TO-263 LM2575HVSX-3.3/NOPB DDPAK/ TO-263 LM2575HVSX-5.0 DDPAK/ TO-263 LM2575HVSX-5.0/NOPB DDPAK/ TO-263 LM2575HVSX-ADJ DDPAK/ TO-263 LM2575HVSX-ADJ/NOPB DDPAK/ TO-263 PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 Pack Materials-Page 1

(mm) Reel Width W1 (mm) (mm) (mm) (mm) (mm) W (mm) Pin1 Quadrant LM2575SX-12 DDPAK/ TO-263 LM2575SX-12/NOPB DDPAK/ TO-263 LM2575SX-15 DDPAK/ TO-263 LM2575SX-15/NOPB DDPAK/ TO-263 LM2575SX-3.3 DDPAK/ TO-263 LM2575SX-3.3/NOPB DDPAK/ TO-263 LM2575SX-5.0 DDPAK/ TO-263 LM2575SX-5.0/NOPB DDPAK/ TO-263 LM2575SX-ADJ DDPAK/ TO-263 LM2575SX-ADJ/NOPB DDPAK/ TO-263 PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 Pack Materials-Page 2

*All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2575HVMX-5.0 SOIC DW 24 1000 367.0 367.0 45.0 LM2575HVMX-5.0/NOPB SOIC DW 24 1000 367.0 367.0 45.0 LM2575HVSX-15 DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575HVSX-15/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575HVSX-3.3 DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575HVSX-3.3/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575HVSX-5.0 DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575HVSX-5.0/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575HVSX-ADJ DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575HVSX-ADJ/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575MX-5.0 SOIC DW 24 1000 367.0 367.0 45.0 LM2575MX-5.0/NOPB SOIC DW 24 1000 367.0 367.0 45.0 LM2575MX-ADJ SOIC DW 24 1000 367.0 367.0 45.0 LM2575MX-ADJ/NOPB SOIC DW 24 1000 367.0 367.0 45.0 LM2575SX-12 DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575SX-12/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575SX-15 DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575SX-15/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575SX-3.3 DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575SX-3.3/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575SX-5.0 DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575SX-5.0/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575SX-ADJ DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 LM2575SX-ADJ/NOPB DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 Pack Materials-Page 3

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