LM2940CT-12NOPB 规格书.pdf

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1、LM2940-N,LM2940CSNVS769I MARCH 2000REVISED APRIL 2013LM2940-N/LM2940C 1A Low Dropout RegulatorCheck for Samples:LM2940-N,LM2940C1FEATURESDESCRIPTIONThe LM2940-N/LM2940C positive voltage regulator2Dropout Voltage Typically 0.5V IO=1Afeatures the ability to source 1A of output current withOutput Curre

2、nt in Excess of 1Aa dropout voltage of typically 0.5V and a maximum ofOutput Voltage Trimmed Before Assembly1V over the entire temperature range.Furthermore,aquiescent current reduction circuit has been includedReverse Battery ProtectionwhichreducesthegroundcurrentwhentheInternal Short Circuit Curre

3、nt Limitdifferential between the input voltage and the outputMirror Image Insertion Protectionvoltage exceeds approximately 3V.The quiescentcurrent with 1A of output current and an input-outputP+Product Enhancement Testeddifferential of 5V is therefore only 30 mA.Higherquiescent currents only exist

4、when the regulator is inthe dropout mode(VIN VOUT 3V).Designed also for vehicular applications,the LM2940-N/LM2940C and all regulated circuitry are protectedfrom reverse battery installations or 2-battery jumps.During line transients,such as load dump when theinput voltage can momentarily exceed the

5、 specifiedmaximumoperatingvoltage,theregulatorwillautomatically shut down to protect both the internalcircuits and the load.The LM2940/LM2940C cannotbeharmedbytemporarymirror-imageinsertion.Familiar regulator features such as short circuit andthermal overload protection are also provided.Typical App

6、lication*Required if regulator is located far from power supply filter.*COUTmust be at least 22 F to maintain stability.May be increased without bound to maintain regulation duringtransients.Locate as close as possible to the regulator.This capacitor must be rated over the same operatingtemperature

7、range as the regulator and the ESR is critical;see curve.1Please be aware that an important notice concerning availability,standard warranty,and use in critical applications ofTexas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.2All trademarks are t

8、he property of their respective owners.PRODUCTION DATA information is current as of publication date.Copyright 20002013,Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty.Production processing does notnecessarily include testing o

9、f all parameters.GNDINPUTN/CGND13426578GNDN/CVOUTVOUTN/CLM2940-N,LM2940CSNVS769I MARCH 2000REVISED APRIL Connection DiagramsFigure 1.TO-220(NDE)Plastic PackageFigure 2.SOT-223(DCY)3-LeadFront ViewFront ViewSee Package Number NDE0003BSee Package Number DCY0004AFigure 3.16-Lead CDIP(NFE)Figure 4.16-Le

10、ad CLGA(NAC)Top ViewTop ViewSee Package Number NFE0016ASee Package Number NAC0016AFigure 5.DDPAK/TO-263(KTT)Figure 6.Side ViewTop ViewSee Package Number KTT0003BPin 2 and pin 7 are fused to center DAPPin 5 and 6 need to be tied together on PCB boardFigure 7.WSON(NGN)8-LeadTop ViewSee Package Number

11、NGN0008AThese devices have limited built-in ESD protection.The leads should be shorted together or the device placed in conductive foamduring storage or handling to prevent electrostatic damage to the MOS gates.2Submit Documentation FeedbackCopyright 20002013,Texas Instruments IncorporatedProduct Fo

12、lder Links:LM2940-N LM2940C庞源商城 py-LM2940-N,LM2940CSNVS769I MARCH 2000REVISED APRIL 2013Absolute Maximum Ratings(1)(2)LM2940-N KTT,NFE,NAC,NDE,DCY 100 ms60VLM2940C KTT,NDE 1 ms45VInternal Power Dissipation(3)Internally LimitedMaximum Junction Temperature150CStorage Temperature Range65C TJ+150CTO-220

13、(NDE),Wave260C,10sDDPAK/TO-263(KTT)235C,30sSoldering Temperature(4)SOT-223(DCY)260C,30sWSON-8(NGN)235C,30sESD Susceptibility(5)2 kV(1)Absolute Maximum Ratings are limits beyond which damage to the device may occur.Operating Conditions are conditions under whichthe device functions but the specificat

14、ions might not be ensured.For ensured specifications and test conditions see the ElectricalCharacteristics.(2)If Military/Aerospace specified devices are required,please contact the Texas Instruments Sales Office/Distributors for availability andspecifications.(3)The maximum allowable power dissipat

15、ion is a function of the maximum junction temperature,TJ,the junction-to-ambient thermalresistance,JA,and the ambient temperature,TA.Exceeding the maximum allowable power dissipation will cause excessive dietemperature,and the regulator will go into thermal shutdown.The value of JA(for devices in st

16、ill air with no heatsink)is 60C/W for theTO-220 package,80C/W for the DDPAK/TO-263 package,and 174C/W for the SOT-223 package.The effective value of JAcan bereduced by using a heatsink(see Application Hints for specific information on heatsinking).The value of JAfor the WSON package isspecifically d

17、ependent on PCB trace area,trace material,and the number of layers and thermal vias.For improved thermal resistanceand power dissipation for the WSON package,refer to Application Note AN-1187(SNOA401).It is recommended that 6 vias be placedunder the center pad to improve thermal performance.(4)Refer

18、 to JEDEC J-STD-020C for surface mount device(SMD)package reflow profiles and conditions.Unless otherwise stated,thetemperature and time are for Sn-Pb(STD)only.(5)ESD rating is based on the human body model,100 pF discharged through 1.5 k.Operating Conditions(1)Input Voltage26VLM2940-N NDE,LM2940-N

19、KTT40C TJ 125CLM2940C NDE,LM2940C KTT0C TJ 125CTemperature RangeLM2940-N DCY40C TA 85CLM2940-N NFE,LM2940-N NAC55C TJ 125CLM2940-N NGN40C TJ 125C(1)Absolute Maximum Ratings are limits beyond which damage to the device may occur.Operating Conditions are conditions under whichthe device functions but

20、the specifications might not be ensured.For ensured specifications and test conditions see the ElectricalCharacteristics.Copyright 20002013,Texas Instruments IncorporatedSubmit Documentation Feedback3Product Folder Links:LM2940-N LM2940C庞源商城 py-LM2940-N,LM2940CSNVS769I MARCH 2000REVISED APRIL Electr

21、ical CharacteristicsVIN=VO+5V,IO=1A,CO=22 F,unless otherwise specified.Boldface limits apply over the entire operatingtemperature range of the indicated device.All other specifications apply for TA=TJ=25C.Output Voltage(VO)5V8VParameterConditionsTypLM2940-NLM2940-TypLM2940-NLM2940-UnitsLimit(1)N/883

22、Limit(1)N/883Limit(2)Limit(2)Output Voltage5 mA IO 1A6.25V VIN 26V9.4V VIN 26V5.004.85/4.754.85/4.758.007.76/7.607.76/7.60VMIN5.15/5.255.15/5.258.24/8.408.24/8.40VMAXLine RegulationVO+2V VIN 26V,205040/50208050/80mVMAXIO=5 mALoad Regulation50 mA IO 1ALM2940-N,LM2940-N/8833550/8050/1005580/13080/130m

23、VMAXLM2940C35505580Output Impedance100 mADC and20 mArms,351000/1000551000/1000mfO=120 HzQuiescent CurrentVO+2V VIN 26V,IO=5 mALM2940-N,LM2940-N/8831015/2015/201015/2015/20mAMAXLM2940C1015VIN=VO+5V,3045/6050/603045/6050/60mAMAXIO=1AOutput Noise Voltage10 Hz 100 kHz,150700/7002401000/1000VrmsIO=5 mARi

24、pple RejectionfO=120 Hz,1 Vrms,IO=100 mALM2940-N7260/546654/48dBMINLM2940C72606654fO=1 kHz,1 Vrms,60/5054/48dBMINIO=5 mALong Term Stability2032mV/1000 HrDropout VoltageIO=1A0.50.8/1.00.7/1.00.50.8/1.00.7/1.0VMAXIO=100 mA110150/200150/200110150/200150/200mVMAXShort CircuitSee(3)1.91.61.5/1.31.91.61.6

25、/1.3AMINCurrentMaximum LineRO=100TransientLM2940-N,T 100 ms7560/607560/60VMINLM2940-N/883,T 20 ms40/4040/40LM2940C,T 1 ms55455545Reverse PolarityRO=100DC Input VoltageLM2940-N,LM2940-N/8833015/1515/153015/1515/15VMINLM2940C30153015(1)All limits are specified at TA=TJ=25C only(standard typeface)or ov

26、er the entire operating temperature range of the indicated device(boldface type).All limits at TA=TJ=25C are 100%production tested.All limits at temperature extremes are specified via correlationusing standard Statistical Quality Control methods.(2)All limits are specified at TA=TJ=25C only(standard

27、 typeface)or over the entire operating temperature range of the indicated device(boldface type).All limits are 100%production tested and are used to calculate Outgoing Quality Levels.(3)Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified tempe

28、rature.4Submit Documentation FeedbackCopyright 20002013,Texas Instruments IncorporatedProduct Folder Links:LM2940-N LM2940C庞源商城 py-LM2940-N,LM2940CSNVS769I MARCH 2000REVISED APRIL 2013Electrical Characteristics(continued)VIN=VO+5V,IO=1A,CO=22 F,unless otherwise specified.Boldface limits apply over t

29、he entire operatingtemperature range of the indicated device.All other specifications apply for TA=TJ=25C.Output Voltage(VO)5V8VParameterConditionsTypLM2940-NLM2940-TypLM2940-NLM2940-UnitsLimit(1)N/883Limit(1)N/883Limit(2)Limit(2)Reverse PolarityRO=100Transient InputLM2940-N,T 100 ms7550/507550/50VM

30、INVoltageLM2940-N/883,T 20 ms45/4545/45LM2940C,T 1 ms5545/45Electrical CharacteristicsVIN=VO+5V,IO=1A,CO=22 F,unless otherwise specified.Boldface limits apply over the entire operatingtemperature range of the indicated device.All other specifications apply for TA=TJ=25C.Output Voltage(VO)9V10VLM2940

31、-NLM2940-NUnitsParameterConditionsTypLimitTypLimit(1)(1)Output Voltage10.5V VIN 26V11.5V VIN 26V5 mA IO1A9.008.73/8.5510.009.70/9.50VMIN9.27/9.4510.30/10.50VMAXLine RegulationVO+2V VIN 26V,209020100mVMAXIO=5 mALoad Regulation50 mA IO 1ALM2940-N6090/15065100/165mVMAXLM2940C6090Output Impedance100 mAD

32、C and20 mArms,6065mfO=120 HzQuiescent CurrentVO+2V VIN 26V,IO=5 mALM2940-N1015/201015/20mAMAXLM2940C1015VIN=VO+5V,IO=1A3045/603045/60mAMAXOutput Noise Voltage10 Hz 100 kHz,270300VrmsIO=5 mARipple RejectionfO=120 Hz,1 Vrms,IO=100 mALM2940-N6452/466351/45dBMINLM2940C6452Long Term3436mV/Stability1000 H

33、rDropout VoltageIO=1A0.50.8/1.00.50.8/1.0VMAXIO=100 mA110150/200110150/200mVMAXShort Circuit CurrentSee(2)1.91.61.91.6AMIN(1)All limits are specified at TA=TJ=25C only(standard typeface)or over the entire operating temperature range of the indicated device(boldface type).All limits at TA=TJ=25C are

34、100%production tested.All limits at temperature extremes are specified via correlationusing standard Statistical Quality Control methods.(2)Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.Copyright 20002013,Texas Instruments In

35、corporatedSubmit Documentation Feedback5Product Folder Links:LM2940-N LM2940C庞源商城 py-LM2940-N,LM2940CSNVS769I MARCH 2000REVISED APRIL Electrical Characteristics(continued)VIN=VO+5V,IO=1A,CO=22 F,unless otherwise specified.Boldface limits apply over the entire operatingtemperature range of the indica

36、ted device.All other specifications apply for TA=TJ=25C.Output Voltage(VO)9V10VLM2940-NLM2940-NUnitsParameterConditionsTypLimitTypLimit(1)(1)Maximum Line TransientRO=100T 100 msLM2940-N7560/607560/60VMINLM2940C5545Reverse PolarityRO=100DC Input VoltageLM2940-N3015/153015/15VMINLM2940C3015Reverse Pol

37、arityRO=100Transient Input VoltageT 100 msLM2940-N7550/507550/50VMINLM2940C5545/45Electrical CharacteristicsVIN=VO+5V,IO=1A,CO=22 F,unless otherwise specified.Boldface limits apply over the entire operatingtemperature range of the indicated device.All other specifications apply for TA=TJ=25C.Output

38、Voltage(VO)12V15VParameterConditionsTypLM2940-NLM2940-TypLM2940-NLM2940-UnitsLimit(1)N/833Limit(1)N/833Limit(2)Limit(2)Output Voltage13.6V VIN 26V16.75V VIN 26V5 mA IO1A12.011.64/11.4011.64/11.4015.014.55/14.2514.55/14.25VMIN0012.36/12.6012.36/12.6015.45/15.7515.45/15.75VMAXLine RegulationVO+2V VIN

39、26V,2012075/1202015095/150mVMAXIO=5 mALoad Regulation50 mA IO 1ALM2940-N,LM2940-N/88355120/200120/190150/240mVMAXLM2940C5512070150Output Impedance100 mADC and20 mArms,801000/10001001000/1000mfO=120 HzQuiescentVO+2V VIN 26V,CurrentIO=5 mALM2940-N,LM2940-N/8831015/2015/2015/20mAMAXLM2940C10151015VIN=V

40、O+5V,IO=1A3045/6050/603045/6050/60mAMAXOutput Noise10 Hz 100 kHz,3601000/10004501000/1000VrmsVoltageIO=5 mA(1)All limits are specified at TA=TJ=25C only(standard typeface)or over the entire operating temperature range of the indicated device(boldface type).All limits at TA=TJ=25C are 100%production

41、tested.All limits at temperature extremes are specified via correlationusing standard Statistical Quality Control methods.(2)All limits are specified at TA=TJ=25C only(standard typeface)or over the entire operating temperature range of the indicated device(boldface type).All limits are 100%productio

42、n tested and are used to calculate Outgoing Quality Levels.6Submit Documentation FeedbackCopyright 20002013,Texas Instruments IncorporatedProduct Folder Links:LM2940-N LM2940C庞源商城 py-LM2940-N,LM2940CSNVS769I MARCH 2000REVISED APRIL 2013Electrical Characteristics(continued)VIN=VO+5V,IO=1A,CO=22 F,unl

43、ess otherwise specified.Boldface limits apply over the entire operatingtemperature range of the indicated device.All other specifications apply for TA=TJ=25C.Output Voltage(VO)12V15VParameterConditionsTypLM2940-NLM2940-TypLM2940-NLM2940-UnitsLimit(1)N/833Limit(1)N/833Limit(2)Limit(2)Ripple Rejection

44、fO=120 Hz,1 Vrms,IO=100 mALM2940-N6654/48dBMINLM2940C66546452fO=1 kHz,1 Vrms,dBMIN52/4648/42IO=5 mALong Term StabilitymV/48601000 HrDropout VoltageIO=1A0.50.8/1.00.7/1.00.50.8/1.00.7/1.0VMAXIO=100 mA110150/200150/200110150/200150/200mVMAXShort Circuit CurrentSee(3)1.91.61.6/1.31.91.61.6/1.3AMINMaxim

45、um LineRO=100TransientLM2940-N,T 100 ms7560/60LM2940-N/883,T 20 ms40/4040/40VMINLM2940C,T 1 ms55455545Reverse PolarityRO=100DC Input VoltageLM2940-N,LM2940-N/8833015/1515/1515/15VMINLM2940C30153015Reverse PolarityRO=100Transient InputLM2940-N,T 100 ms7550/50VoltageLM2940-N/883,T 20 ms45/4545/45VMINL

46、M2940C,T 1 ms5545/455545/45(3)Output current will decrease with increasing temperature but will not drop below 1A at the maximum specified temperature.Thermal Performance3-Lead TO-2204Thermal ResistanceC/WJunction-to-Case,(JC)3-Lead DDPAK/TO-26343-Lead TO-220(1)603-Lead DDPAK/TO-263(1)80Thermal Resi

47、stanceC/WJunction-to-Ambient,(JA)SOT-223(1)1748-Lead WSON(1)35(1)The maximum allowable power dissipation is a function of the maximum junction temperature,TJ,the junction-to-ambient thermalresistance,JA,and the ambient temperature,TA.Exceeding the maximum allowable power dissipation will cause exces

48、sive dietemperature,and the regulator will go into thermal shutdown.The value of JA(for devices in still air with no heatsink)is 60C/W for theTO-220 package,80C/W for the DDPAK/TO-263 package,and 174C/W for the SOT-223 package.The effective value of JAcan bereduced by using a heatsink(see Applicatio

49、n Hints for specific information on heatsinking).The value of JAfor the WSON package isspecifically dependent on PCB trace area,trace material,and the number of layers and thermal vias.For improved thermal resistanceand power dissipation for the WSON package,refer to Application Note AN-1187(SNOA401

50、).It is recommended that 6 vias be placedunder the center pad to improve thermal performance.Copyright 20002013,Texas Instruments IncorporatedSubmit Documentation Feedback7Product Folder Links:LM2940-N LM2940C庞源商城 py-LM2940-N,LM2940CSNVS769I MARCH 2000REVISED APRIL Typical Performance Characteristic