LM7905 TI | Alldatasheet
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LM7905,LM7912,LM7915 www.ti.com SNOSBQ7C –JUNE 1999–REVISED MAY 2013 LM79XXSeries3-TerminalNegativeRegulators Check forSamples: LM7905 ,LM7912 ,LM7915 1FEATURES Connection Diagram 2• Thermal,ShortCircuitand Safe Area Protection
- High RippleRejection
- 1.5A Output Current
- 4% Toleranceon PresetOutput Voltage space
DESCRIPTION
Figure1. TO-220 PackageThe LM79XX series of 3-terminalregulatorsis FrontViewavailablewithfixedoutputvoltagesof−5V,−12V,and See Package Number NDE0003B−15V. These devices need only one external component— a compensationcapacitorattheoutput. The LM79XX seriesispackaged intheTO-220 power TypicalApplicationspackage and iscapableof supplying1.5A of output current. These regulatorsemploy internalcurrentlimitingsafe area protectionand thermalshutdown forprotection againstvirtuallyalloverloadconditions. Low ground pincurrentoftheLM79XX seriesallows outputvoltagetobe easilyboostedabove thepreset value with a resistordivider.The low quiescent *Requiredifregulatorisseparatedfromcurrentdrain of these devices with a specified filtercapacitorby more than3″.Forvalue maximum change withlineand load ensures good given,capacitormust be solidtantalum. regulationinthevoltageboostedmode. 25μF aluminum electrolyticmay be substituted.For applicationsrequiringothervoltages,see LM137 †Requiredforstability.Forvaluegiven,datasheet. capacitormust be solidtantalum.25μF aluminum electrolyticmay be substituted. Valuesgivenmay be increasedwithout limit. Foroutputcapacitanceinexcessof100μF, a highcurrentdiodefrominputtooutput (1N4001,etc.)willprotecttheregulator frommomentary inputshorts. Figure2. FixedRegulator Pleasebe aware thatan importantnoticeconcerningavailability,standardwarranty,and use incriticalapplicationsof Texas Instrumentssemiconductorproductsand disclaimerstheretoappearsattheend ofthisdatasheet. 2Alltrademarksarethepropertyoftheirrespectiveowners. PRODUCTION DATA informationiscurrentas ofpublicationdate. Copyright© 1999–2013,Texas InstrumentsIncorporatedProductsconform to specificationsper the terms of the Texas Instrumentsstandardwarranty.Productionprocessingdoes not necessarilyincludetestingofallparameters.
LM7905,LM7912,LM7915 SNOSBQ7C –JUNE 1999–REVISED MAY 2013 www.ti.com These deviceshave limitedbuilt-inESD protection.The leadsshouldbe shortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamage totheMOS gates. ABSOLUTE MAXIMUM RATINGS (1) InputVoltage (Vo = −5V) −25V (Vo = −12V and −15V) −35V Input-OutputDifferential (Vo = −5V) 25V (Vo = −12V and −15V) 30V Power Dissipation(2) InternallyLimited OperatingJunctionTemperatureRange 0°C to+125°C StorageTemperatureRange −65°C to+150°C Lead Temperature(Soldering,10 sec.) 230°C (1) AbsoluteMaximum Ratingsindicatelimitsbeyond whichdamage tothedevicemay occur.OperatingRatingsindicateconditionsfor whichthedeviceisintendedtobe functional,butdo notensureSpecificPerformancelimits.Forensuredspecificationsand test conditions,see theElectricalCharacteristics. (2) RefertoDESIGN CONSIDERATIONS fordetails.
ELECTRICAL CHARACTERISTICS
Conditionsunlessotherwisenoted:IOUT = 500mA, C IN = 2.2μF,C OUT = 1μF,0°C ≤ TJ ≤ +125°C, Power Dissipation≤ 1.5W. PartNumber LM7905C Units Output Voltage −5V InputVoltage(unlessotherwisespecified) −10V Symbol Parameter Conditions Min Typ Max VO OutputVoltage TJ = 25°C −4.8 −5.0 −5.2 V 5mA ≤ IOUT ≤ 1A, −4.75 −5.25 V ΔVO LineRegulation TJ = 25°C, (1) 8 50 mV (−25 ≤ VIN ≤ −7) V 2 15 mV (−12 ≤ VIN ≤ −8) V ΔVO Load Regulation TJ = 25°C, (1) 5mA ≤ IOUT ≤ 1.5A 15 100 mV 250mA ≤ IOUT ≤ 750mA 5 50 mV IQ QuiescentCurrent TJ = 25°C 1 2 mA ΔIQ QuiescentCurrent WithLine 0.5 mA Change (−25 ≤ VIN ≤ −7) V WithLoad,5mA ≤ IOUT ≤ 1A 0.5 mA Vn OutputNoiseVoltage TA = 25°C, 10Hz ≤ f≤ 100Hz 125 μV RippleRejection f= 120Hz 54 66 dB (−18 ≤ VIN ≤ −8) V DropoutVoltage TJ = 25°C, IOUT = 1A 1.1 V IOMAX Peak OutputCurrent TJ = 25°C 2.2 A AverageTemperature IOUT = 5mA, 0.4 mV/°C Coefficientof 0 C ≤ TJ ≤ 100°C OutputVoltage (1) Regulationismeasured ata constantjunctiontemperatureby pulsetestingwitha lowdutycycle.Changes inoutputvoltagedue to heatingeffectsmust be takenintoaccount.
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LM7905,LM7912,LM7915 www.ti.com SNOSBQ7C –JUNE 1999–REVISED MAY 2013 Conditionsunlessotherwisenoted:IOUT = 500mA, C IN = 2.2μF,C OUT = 1μF,0°C ≤ TJ ≤ +125°C, Power Dissipation≤ 1.5W. PartNumber LM7912C LM7915C Units Output Voltage −12V −15V InputVoltage(unlessotherwisespecified) −19V −23V Symbol Parameter Conditions Min Typ Max Min Typ Max 5mA ≤ IOUT ≤ 1A, −11.4 −12.6 −14.25 −15.75 V ΔVO LineRegulation TJ = 25°C, (1) 5 80 5 100 mV 3 30 3 50 mV ΔVO Load Regulation TJ = 25°C, (1) 5mA ≤ IOUT ≤ 1.5A 15 200 15 200 mV 250mA ≤ IOUT ≤ 750mA 5 75 5 75 mV IQ QuiescentCurrent TJ = 25°C 1.5 3 1.5 3 mA ΔIQ QuiescentCurrent WithLine 0.5 0.5 mA Change (−30 ≤ VIN ≤ −14.5) (−30 ≤VIN ≤ −17.5) V WithLoad,5mA ≤ IOUT ≤ 1A 0.5 0.5 mA Vn OutputNoiseVoltage TA = 25°C, 10Hz ≤ f≤ 100Hz 300 375 μV RippleRejection f= 120 Hz 54 70 54 70 dB DropoutVoltage TJ = 25°C, IOUT = 1A 1.1 1.1 V IOMAX Peak OutputCurrent TJ = 25°C 2.2 2.2 A AverageTemperature IOUT = 5mA, −0.8 −1.0 mV/°C Coefficientof 0 C ≤ TJ ≤ 100°C OutputVoltage (1) Regulationismeasured ata constantjunctiontemperatureby pulsetestingwitha lowdutycycle.Changes inoutputvoltagedue to heatingeffectsmust be takenintoaccount. Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLinks:LM7905 LM7912 LM7915
LM7905,LM7912,LM7915 SNOSBQ7C –JUNE 1999–REVISED MAY 2013 www.ti.com DESIGN CONSIDERATIONS The LM79XX fixedvoltageregulatorserieshas thermaloverloadprotectionfrom excessivepower dissipation, internalshortcircuitprotectionwhich limitsthe circuit'smaximum current,and outputtransistorsafe-area compensationforreducingtheoutputcurrentas thevoltageacrossthepass transistorisincreased. Althoughthe internalpower dissipationislimited,the junctiontemperaturemust be keptbelow the maximum specifiedtemperature(125°C) inorderto meet data sheetspecifications.To calculatethe maximum junction temperatureorheatsinkrequired,thefollowingthermalresistancevaluesshouldbe used: Typ Max Typ Max Package θJC θJC θJA θJA °C/W °C/W °C/W °C/W TO-220 3.0 5.0 60 40 (1) SolvingforTJ: TJ = TA + PD (θJC + θCA ) or = TA + PD θJA (withoutheatsink) where
- TJ = JunctionTemperature
- TA = AmbientTemperature
- PD = Power Dissipation
- θJA = Junction-to-AmbientThermalResistance
- θJC = Junction-to-CaseThermalResistance
- θCA = Case-to-AmbientThermalResistance
- θCS = Case-to-HeatSinkThermalResistance
- θSA = Heat Sink-to-AmbientThermalResistance TypicalApplications Bypass capacitorsarenecessaryforstableoperationoftheLM79XX seriesofregulatorsovertheinputvoltage and outputcurrentranges.Outputbypasscapacitorswillimprovethetransientresponseby theregulator. The bypasscapacitors,(2.2μF on theinput,1.0μF on theoutput)shouldbe ceramicorsolidtantalumwhichhave good highfrequencycharacteristics.Ifaluminum electrolyticsare used,theirvaluesshouldbe 10μF or larger. The bypass capacitorsshouldbe mounted withtheshortestleads,and ifpossible,directlyacrosstheregulator terminals.
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LM7905,LM7912,LM7915 www.ti.com SNOSBQ7C –JUNE 1999–REVISED MAY 2013 Load and lineregulation< 0.01% temperaturestability≤ 0.2% †DetermineZenercurrent ††Solidtantalum *Selectresistorstosetoutputvoltage.2 ppm/°C trackingsuggested Figure3. High Stability1 Amp Regulator Figure4. CurrentSource *Lamp brightnessincreaseuntiliI= iQ (≈ 1 mA) + 5V/R1. †Necessaryonlyifraw supplyfiltercapacitorismore that2″ fromLM7905CT Figure5. LightControllerUsing SiliconPhoto Cell Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLinks:LM7905 LM7912 LM7915
LM7905,LM7912,LM7915 SNOSBQ7C –JUNE 1999–REVISED MAY 2013 www.ti.com *Lamp brightnessincreasesuntilii= 5V/R1 (Iican be setas lowas 1 μA) †Necessaryonlyifraw supplyfiltercapacitorismore that2″ fromLM7905 Figure6. High-SensitivityLightController *Improvestransientresponseand ripplerejection.Do notincreasebeyond 50 μF. SelectR2 as follows: LM7905CT 300Ω LM7912CT 750Ω LM7915CT 1k Figure7. VariableOutput
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LM7905,LM7912,LM7915 www.ti.com SNOSBQ7C –JUNE 1999–REVISED MAY 2013 (-15) (+15) Load RegulationatΔIL = 1A 40mV 2mV OutputRipple,C IN = 3000µF,IL = 1A 100 µVms 100 µVms TemperatureStability 50mV 50mV OutputNoise10Hz ≤ f≤ 10kHz 150 µVms 150 µVms *ResistortoleranceofR4 and R5 determinematchingof(+)and (−)outputs. **Necessaryonlyifraw supplyfiltercapacitorsaremore than3″ fromregulators. Figure8. ±15V,1 Amp TrackingRegulators Figure9. Dual Trimmed Supply Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLinks:LM7905 LM7912 LM7915
LM7905,LM7912,LM7915 SNOSBQ7C –JUNE 1999–REVISED MAY 2013 www.ti.com Schematic Diagrams Figure10. −5V Figure11. −12V and −15V
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LM7905,LM7912,LM7915 www.ti.com SNOSBQ7C –JUNE 1999–REVISED MAY 2013
REVISION HISTORY
Changes from RevisionB (May 2013)toRevisionC Page Copyright© 1999–2013,Texas InstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLinks:LM7905 LM7912 LM7915
www.ti.com 7-Oct-2025 PACKAGING INFORMATION Orderable part number Status (1) Material type (2) Package | Pins Package qty | Carrier RoHS (3) Lead finish/ Ball material (4) MSL rating/ Peak reflow (5) Op temp (°C) Part marking (6) LM7905CT/NOPB Active Production TO-220 (NDE) | 3 45 | TUBE Yes SN Level-1-NA-UNLIM 0 to 125 LM7905CT LM7905CT/NOPB.B Active Production TO-220 (NDE) | 3 45 | TUBE Yes SN Level-1-NA-UNLIM 0 to 125 LM7905CT LM7912CT/NOPB Active Production TO-220 (NDE) | 3 45 | TUBE Yes SN Level-1-NA-UNLIM 0 to 125 LM7912CT LM7912CT/NOPB.B Active Production TO-220 (NDE) | 3 45 | TUBE Yes SN Level-1-NA-UNLIM 0 to 125 LM7912CT LM7915CT/NOPB Active Production TO-220 (NDE) | 3 45 | TUBE Yes SN Level-1-NA-UNLIM 0 to 125 LM7915CT LM7915CT/NOPB.B Active Production TO-220 (NDE) | 3 45 | TUBE Yes SN Level-1-NA-UNLIM 0 to 125 LM7915CT (1) Status: For more details on status, see our product life cycle. (2) Material type: When designated, preproduction parts are prototypes/experimental devices, and are not yet approved or released for full production. Testing and final process, including without limitation quality assurance, reliability performance testing, and/or process qualification, may not yet be complete, and this item is subject to further changes or possible discontinuation. If available for ordering, purchases will be subject to an additional waiver at checkout, and are intended for early internal evaluation purposes only. These items are sold without warranties of any kind. (3) RoHS values: Yes, No, RoHS Exempt. See the TI RoHS Statement for additional information and value definition. (4) Lead finish/Ball material: Parts may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two lines if the finish value exceeds the maximum column width. (5) MSL rating/Peak reflow: The moisture sensitivity level ratings and peak solder (reflow) temperatures. In the event that a part has multiple moisture sensitivity ratings, only the lowest level per JEDEC standards is shown. Refer to the shipping label for the actual reflow temperature that will be used to mount the part to the printed circuit board. (6) Part marking: There may be an additional marking, which relates to the logo, the lot trace code information, or the environmental category of the part. Multiple part markings will be inside parentheses. Only one part marking contained in parentheses and separated by a "~" will appear on a part. If a line is indented then it is a continuation of the previous line and the two combined represent the entire part marking for that device. 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 1
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PACKAGE MATERIALS INFORMATION www.ti.com 23-May-2025 TUBE L - Tube length T - Tube height W - Tube width B - Alignment groove width *All dimensions are nominal Device Package Name Package Type Pins SPQ L (mm) W (mm) T (µm) B (mm) LM7905CT/NOPB NDE TO-220 3 45 502 33 6985 4.06 LM7905CT/NOPB.B NDE TO-220 3 45 502 33 6985 4.06 LM7912CT/NOPB NDE TO-220 3 45 502 33 6985 4.06 LM7912CT/NOPB.B NDE TO-220 3 45 502 33 6985 4.06 LM7915CT/NOPB NDE TO-220 3 45 502 33 6985 4.06 LM7915CT/NOPB.B NDE TO-220 3 45 502 33 6985 4.06 Pack Materials-Page 1
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