LM7905_13 TI1 | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 13
Technical content
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.
2 SubmitDocumentationFeedback Copyright© 1999–2013,Texas InstrumentsIncorporated
ProductFolderLinks:LM7905 LM7912 LM7915
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.
4 SubmitDocumentationFeedback Copyright© 1999–2013,Texas InstrumentsIncorporated
ProductFolderLinks:LM7905 LM7912 LM7915
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
6 SubmitDocumentationFeedback Copyright© 1999–2013,Texas InstrumentsIncorporated
ProductFolderLinks:LM7905 LM7912 LM7915
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
8 SubmitDocumentationFeedback Copyright© 1999–2013,Texas InstrumentsIncorporated
ProductFolderLinks:LM7905 LM7912 LM7915
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 1-Nov-2013 Addendum-Page 1 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/Ball Finish (6) MSL Peak Temp (3) Op Temp (°C) Device Marking (4/5) Samples LM7905CT NRND TO-220 NDE 3 45 TBD Call TI Call TI 0 to 125 LM7905CT LM7905CT/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM 0 to 125 LM7905CT LM7912CT NRND TO-220 NDE 3 45 TBD Call TI Call TI 0 to 125 LM7912CT LM7912CT/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM 0 to 125 LM7912CT LM7915CT NRND TO-220 NDE 3 45 TBD Call TI Call TI 0 to 125 LM7915CT LM7915CT/NOPB ACTIVE TO-220 NDE 3 45 Green (RoHS & no Sb/Br) CU SN Level-1-NA-UNLIM 0 to 125 LM7915CT (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) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device.
www.ti.com 1-Nov-2013 Addendum-Page 2 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
www.ti.com
Texas InstrumentsIncorporatedand itssubsidiaries(TI)reservetherighttomake corrections,enhancements,improvementsand other changes toitssemiconductorproductsand servicesperJESD46, latestissue,and todiscontinueany productorserviceperJESD48, latest issue.Buyersshouldobtainthelatestrelevantinformationbeforeplacingordersand shouldverifythatsuch informationiscurrentand complete.Allsemiconductorproducts(alsoreferredtohereinas “components”)aresoldsubjecttoTI’s termsand conditionsofsale suppliedatthetimeoforderacknowledgment. TIwarrantsperformanceofitscomponents tothespecificationsapplicableatthetimeofsale,inaccordancewiththewarrantyinTI’s terms and conditionsofsaleofsemiconductorproducts.Testingand otherqualitycontroltechniquesareused totheextentTIdeems necessary tosupportthiswarranty.Exceptwhere mandated by applicablelaw,testingofallparametersofeach component isnotnecessarily performed. TIassumes no liabilityforapplicationsassistanceorthedesignofBuyers’products.Buyersareresponsiblefortheirproductsand applicationsusingTIcomponents.To minimizetherisksassociatedwithBuyers’productsand applications,Buyersshouldprovide adequatedesignand operatingsafeguards. TIdoes notwarrantorrepresentthatany license,eitherexpressorimplied,isgrantedunderany patentright,copyright,mask work right,or otherintellectualpropertyrightrelatingtoany combination,machine,orprocessinwhichTIcomponents orservicesareused.Information publishedby TIregardingthird-partyproductsorservicesdoes notconstitutea licensetouse such productsorservicesora warrantyor endorsementthereof.Use ofsuch informationmay requirea licensefroma thirdpartyunderthepatentsorotherintellectualpropertyofthe thirdparty,ora licensefromTIunderthepatentsorotherintellectualpropertyofTI. ReproductionofsignificantportionsofTIinformationinTIdatabooks ordatasheetsispermissibleonlyifreproductioniswithoutalteration and isaccompaniedby allassociatedwarranties,conditions,limitations,and notices.TIisnotresponsibleorliableforsuch altered documentation.Informationofthirdpartiesmay be subjecttoadditionalrestrictions. ResaleofTIcomponents orserviceswithstatementsdifferentfromorbeyond theparametersstatedby TIforthatcomponent orservice voidsallexpressand any impliedwarrantiesfortheassociatedTIcomponent orserviceand isan unfairand deceptivebusinesspractice. TIisnotresponsibleorliableforany such statements. Buyeracknowledgesand agreesthatitissolelyresponsibleforcompliancewithalllegal,regulatoryand safety-relatedrequirements concerningitsproducts,and any use ofTIcomponents initsapplications,notwithstandingany applications-relatedinformationorsupport thatmay be providedby TI.Buyerrepresentsand agreesthatithas allthenecessaryexpertisetocreateand implementsafeguardswhich anticipatedangerousconsequencesoffailures,monitorfailuresand theirconsequences,lessenthelikelihoodoffailuresthatmightcause harm and takeappropriateremedialactions.BuyerwillfullyindemnifyTIand itsrepresentativesagainstany damages arisingoutoftheuse ofany TIcomponents insafety-criticalapplications. Insome cases,TIcomponents may be promotedspecificallytofacilitatesafety-relatedapplications.Withsuch components,TI’s goalisto helpenablecustomerstodesignand createtheirown end-productsolutionsthatmeet applicablefunctionalsafetystandardsand requirements.Nonetheless,such components aresubjecttotheseterms. No TIcomponents areauthorizedforuse inFDA ClassIII(orsimilarlife-criticalmedicalequipment)unlessauthorizedofficersoftheparties have executeda specialagreementspecificallygoverningsuch use. OnlythoseTIcomponents whichTIhas specificallydesignatedas militarygradeor“enhanced plastic”aredesignedand intendedforuse in military/aerospaceapplicationsorenvironments.Buyeracknowledgesand agreesthatany militaryoraerospaceuse ofTIcomponents whichhave not been so designatedissolelyattheBuyer's risk,and thatBuyerissolelyresponsibleforcompliancewithalllegaland regulatoryrequirementsinconnectionwithsuch use. TIhas specificallydesignatedcertaincomponents as meetingISO/TS16949 requirements,mainlyforautomotiveuse.Inany case ofuse of non-designatedproducts,TIwillnotbe responsibleforany failuretomeet ISO/TS16949. Products Applications Audio www.ti.com/audio Automotiveand Transportationwww.ti.com/automotive Amplifiers amplifier.ti.com Communicationsand Telecom www.ti.com/communications Data Converters dataconverter.ti.com Computers and Peripherals www.ti.com/computers DLP ® Products www.dlp.com Consumer Electronics www.ti.com/consumer-apps DSP dsp.ti.com Energyand Lighting www.ti.com/energy Clocksand Timers www.ti.com/clocks Industrial www.ti.com/industrial Interface interface.ti.com Medical www.ti.com/medical Logic logic.ti.com Security www.ti.com/security Power Mgmt power.ti.com Space,Avionicsand Defense www.ti.com/space-avionics-defense Microcontrollers microcontroller.ti.com Videoand Imaging www.ti.com/video RFID www.ti-rfid.com OMAP ApplicationsProcessors www.ti.com/omap TIE2E Community e2e.ti.com WirelessConnectivity www.ti.com/wirelessconnectivity MailingAddress:Texas Instruments,PostOfficeBox 655303,Dallas,Texas 75265 Copyright© 2013,Texas InstrumentsIncorporated