LM2990

LM2990August31,2010NegativeLowDropoutRegulatorGeneralDescriptionTheLM2990isathree-terminal,lowdropout,1ampereneg-ativevoltageregulatoravailablewithfixedoutputvoltagesof−5,−5.2,−12,and−15V.TheLM2990usesnewcircuitdesigntechniquestoprovidelowdropoutandlowquiescentcurrent.Thedropoutvoltageat1Aloadcurrentistypically0.6Vandaguaranteedworst-casemaximumof1Vovertheentireoperatingtemperaturerange.Thequiescentcurrentistypically1mAwith1Aloadcurrentandaninput-outputvoltagedifferentialgreaterthan3V.Auniquecircuitdesignoftheinternalbiassupplylimitsthequiescentcurrenttoonly9mA(typical)whentheregulatorisinthedropoutmode(VOUT−VIN≤3V).Outputvoltageac-curacyisguaranteedto±5%overload,andtemperatureextremes.TheLM2990isshort-circuitproof,andthermalshutdownin-cludeshysteresistoenhancethereliabilityofthedevicewhenoverloadedforanextendedperiodoftime.TheLM2990isavailableina3-leadTO-220packageandisratedforopera-tionovertheautomotivetemperaturerangeof−40°Cto+125°C.Features■5%outputaccuracyoverentireoperatingrange■Outputcurrentinexcessof1A■Dropoutvoltagetypically0.6Vat1Aload■Lowquiescentcurrent■Internalshortcircuitcurrentlimit■Internalthermalshutdownwithhysteresis■FunctionalcomplementtotheLM2940seriesApplications■Postswitcherregulator■Local,on-card,regulation■BatteryoperatedequipmentTypicalApplication1080101*Requirediftheregulatorislocatedfurtherthan6inchesfromthepowersupplyfiltercapacitors.A1μFsolidtantalumora10μFaluminumelectrolyticcapacitorisrecommended.**Requiredforstability.Mustbeatleasta10μFaluminumelectrolyticora1μFsolidtantalumtomaintainstability.Maybeincreasedwithoutboundtomaintainregulationduringtransients.Locatethecapacitorascloseaspossibletotheregulator.Theequivalentseriesresistance(ESR)iscritical,andshouldbelessthan10Ωoverthesameoperatingtemperaturerangeastheregulator.OrderingInformationandConnectionDiagramsTemperatureRangeOutputVoltagePackage-5.0-5.2-12-15−40°Cto+125°CLM2990T-5.0LM2990T-5.2LM2990T-12LM2990T-15TO-220LM2990S-5.0LM2990S-12LM2990S-15TO-263−55°Cto+125°CLM2990J-5.0-QML5962-9571101QEALM2990J-12-QML5962-9571001QEALM2990J-15-QML5962-9570901QEAJ16ALM2990WG5.0-QML5962-9571101QXAWG16A©2010NationalSemiconductorCorporation10801(5962-9571101QEA),LM2990J-12-QML(5962-9571001QEA),orLM2990J-15-QML(5962-9570901QEA),SeeNSPackageNumberJ16A16-LeadCeramicSurfaceMountPackage1080134TopViewOrderNumberLM2990WG5.0-QML(5962-9571101QXEA)SeeNSPackageNumberWG16A(Note1)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.InputVoltage−26Vto+0.3VESDSusceptibility(Note2)2kVPowerDissipation(Note3)InternallyLimitedJunctionTemperature(TJmax)125°CStorageTemperature−65°Cto+150°CSolderingTemperatureTO-220(T),Wave260°C,10secTO-263(S)235°C,30secOperatingRatings(Note1)JunctionTemperatureRange(TJ)−40°Cto+125°CMaximumInputVoltage(Operational)−26VElectricalCharacteristicsVIN=−5V+VO(NOM)(Note6),IO=1A,CO=47μF,unlessotherwisespecified.Boldfacelimitsapplyovertheentireoperatingtemperaturerange,−40°C≤TJ≤125°C,allotherlimitsapplyforTJ=25°C.LM2990-5.0LM2990-5.2Units(Limit)ParameterConditionsTypLimitTypLimit(Note4)(Note5)(Note4)(Note5)OutputVoltage(VO)5mA≤IO≤1A−5−4.90−5.2−5.10V(max)−5.10−5.30mV(min)V5mA≤IO≤1A−4.75−4.94V(max)−5.25−5.46V(min)LineRegulationIO=5mA,440440mV(max)VO(NOM)−1VVIN−26VLoadRegulation50mA≤IO≤1A140140mV(max)DropoutVoltageIO=0.1A,ΔVO≤100mV0.10.30.10.3V(max)IO=1A,ΔVO≤100mV0.610.61V(max)QuiescentCurrent(Iq)IO≤1A1515mA(max)IO=1A,VIN=VO(NOM)950950mA(max)ShortCircuitCurrentRL=1Ω(Note7)1.81.51.81.5A(min)MaximumOutputCurrent(Note7)1.81.51.81.5A(min)RippleRejectionVripple=1Vrms,58505850dB(min)ƒripple=1kHz,IO=5mAOutputNoiseVoltage10Hz–100kHz,IO=5mA250750250750μV(max)LongTermStability1000Hours20002000ppmElectricalCharacteristicsVIN=−5V+VO(NOM)(Note6),IO=1A,CO=47μF,unlessotherwisespecified.Boldfacelimitsapplyovertheentireoperatingtemperaturerange,−40°C≤TJ≤125°C,allotherlimitsapplyforTJ=25°C.LM2990-12LM2990-15Units(Limit)ParameterConditionsTypLimitTypLimit(Note4)(Note5)(Note4)(Note5)OutputVoltage(VO)5mA≤IO≤1A−12−11.76−15−14.70V(max)−12.24−15.30V(min)V5mA≤IO≤1A−11.40−14.25V(max)−12.60−15.75V(min)LineRegulationIO=5mA,660660mV(max)VO(NOM)−1VVIN−26VLoadRegulation50mA≤IO≤1A350350mV(max)DropoutVoltageIO=0.1A,ΔVO≤100mV0.10.30.10.3V(max)IO=1A,ΔVO≤100mV0.610.61V(max)3(Limit)ParameterConditionsTypLimitTypLimit(Note4)(Note5)(Note4)(Note5)QuiescentCurrent(Iq)IO≤1A1515mA(max)IO=1A,VIN=VO(NOM)950950mA(max)ShortCircuitCurrentRL=1Ω(Note7)1.20.91.00.75A(min)MaximumOutputCurrent(Note7)1.81.41.81.4A(min)RippleRejectionVripple=1Vrms,52425242dB(min)ƒripp