LM2902SR

LM2904，LM2902
www.cosine-ic.com 1Features
■WideSupplyRangeof3V~36V
■LargeDCVoltageGain:100dB
■QuiescentCurrentperAmplifier:250μA
■GainBandwidthProduct:1.0MHz
■SlewRate:0.35V/µs
■UnityGainStable
■InputCommon-modeVoltageRange
IncludesnegativeRails
■DifferentialInputVoltageRangeEqualto
thePowerSupplyVoltage
■PackagingAvailable
LM2904availableinSOP8/MSOP8
LM2902availableinSOP14/TSSOP14
Applications
■PowerSuppliesandMobileChargers
■MotorControl
■ACInverters
■WhiteGoods
■BatteryorSolarPoweredSystems\
GeneralDescription
TheLM2904(dual)andLM2902(quad)are
low-power,lowcostoperationalamplifiers(op
amps)operatedon3Vto36Vsupplies.Despite
theirwidesupplyrange,theLM2904/2902
familyprovidesexcellentoverallperformance
andversatility.Theyhavehighdifferentialinput
voltagecapability.Thecommon-modeinput
voltagerangeincludesground,enablingdirect
sensingnearground.
TheLM2904/2902familyisunitygainstable
andhasagainbandwidthproductof1.0MHz
(typical).TheyprovidehighCMRRandPSRR
performanceandcanoperatefromasingle
supplyvoltageaswellasdualsupplyvoltages.
TheLM2904/2902familycanbedesignedinto
awiderangeofapplicationsataneconomical
pricewithoutsacrificingbasicperformance.
Rev1.4
Copyright@2018CosineNanoelectronicsInc.Allrightsreserved
Theinformationprovidedhereisbelievedtobeaccurateandreliable.CosineNanoelectronicsassumes
noreliabilityforinaccuraciesandomissions.Specificationsdescribedandcontainedherearesubjected
tochangewithoutnoticeonthepurposeofimprovingthedesignandperformance.Allofthisinformation
describedhereinshouldnotbeimpliedorgrantedforanythirdparty.LowCost,HighVoltage
OperationalAmplifiers
LM2904，LM2902
www.cosine-ic.com 21.PinConfigurationandFunctions
LM2904 LM2902
PinFunctions
Name Description Note
+VsPositivepowersupplyAbypasscapacitorof0.1μFasclosetothepartas
possibleshouldbeplacedbetweenpowersupplypins
orbetweensupplypinsandground.
-VsNegativepowersupply
orgroundIfitisnotconnectedtoground,bypassitwitha
capacitorof0.1μFasclosetothepartaspossible.
-IN NegativeinputInvertinginputoftheamplifier.Voltagerangeofthis
pincangofrom-Vs-0.3Vto+Vs-1V.
+IN PositiveinputNon-invertinginputoftheamplifier.Thispinhasthe
samevoltagerangeas–IN.
OUTOutputTheoutputvoltagerangeextendstowithinmillivolts
ofeachsupplyrail.
NC Noconnection
2.PackageandOrderingInformation
ModelChannelOrderNumber Package PackageOptionMarking
Information
LM2904 2LM2904SR SOP-8 COS358H TapeandReel,4000 V
LM2904MR MSOP-8TapeandReel,3000COS358HV
LM2902 4LM2902SR SOP-14TapeandReel,3000COS324HV
LM2902TR TSSOP-14TapeandReel,3000COS324HV
LM2904，LM2902
www.cosine-ic.com 33.ProductSpecification
3.1AbsoluteMaximumRatings(1)
Parameter Rating Units
PowerSupply:+Vsto-Vs 36or±18 V
InputVoltage -0.3to+Vs V
DifferentialInputVoltage ±Vs V
InputCurrent(DC) 50 mA
StorageTemperatureRange -65to150 °C
JunctionTemperature 150 °C
OperatingTemperatureRange -40to125 °C
ESDSusceptibility,HBM 2000 V
(1)Stressesexceedingtheabsolutemaximumratingsmaydamagethedevice.Thedevicemaynotfunctionorbeoperable
abovetherecommendedoperatingconditionsandstressingthepartstotheselevelsisnotrecommended.Inaddition,
extendedexposuretostressesabovetherecommendedoperatingconditionsmayaffectdevicereliability.Theabsolute
maximumratingsarestressratingsonly.
3.2ThermalData
Parameter Rating Unit
PackageThermalResistance,RθJA
(Juntion-to-ambient)190(SOT23-5)
206(MSOP8)
155(SOP8)
105(TSSOP14)
82(SOP14)°C/W
3.3RecommendedOperatingConditions
Parameter Rating Unit
DCSupplyVoltage 3~36 V
Inputcommon-modevoltagerange -Vs~+Vs-1.5 V
Operatingambienttemperature -40to+85 °C
LM2904，LM2902
www.cosine-ic.com 43.4ElectricalCharacteristics
(+VS=+5Vto36V,-VS=0,VCM=VS/2,TA=+25°C,RL=10kΩtoVS/2,unlessotherwisenoted)
Parameter Symbol Conditions MinTypMaxUnit
InputCharacteristics
InputOffsetVoltage VOS 2.05.0mV
InputOffsetVoltageDrift ΔVOS/ΔT-40to125°C 715μV/°C
InputBiasCurrent IB 45250nA
InputOffsetCurrent IOS 350nA
Common-ModeVoltageRangeVCM +VS=30V 0+Vs
-1.5V
Common-ModeRejectionRatioCMRRVCM=0to(+Vs-1.5) 6590 dB
LargeSignalVoltageGain AOLVO=1to11V,+VS=15V,
RL=2kΩ25100 V/mV
OutputCharacteristics
High-levelOutputVoltage VOH+VS=18V,RL=2kΩ 16 V
+VS=18V,RL=10kΩ16.3 V
Low-levelOutputVoltage VOL +VS=5V,RL=10kΩ 520mV
OutputSourceCurrent ISR+VS=15V,VO=2V,
Vid=1V2040 mA
OutputSinkCurrent ISK+VS=15V,VO=2V,
Vid=-1V1015 mA
+VS=15V,VO=0.2V,
Vid=-1V1250 μA
Short-CircuitCurrenttoGroundISC +VS=15V 4060mA
PowerSupply
OperatingVoltageRange Vs 3 36V
PowerSupplyRejectionRatioPSRRVS=5Vto36V 65100 dB
QuiescentCurrent/AmplifierIQVS=+30V 250500μA
VS=+5V 200400μA
DynamicPerformance
GainBandwidthProduct GBWPG=+1 1.0 MHz
SlewRate SR G=+1,2VOutputStep 0.35 V/μs
LM2904，LM2902
www.cosine-ic.com 54.0ApplicationNotes
DrivingCapacitiveLoads
Drivinglargecapacitiveloadscancausestabilityproblemsforvoltagefeedbackopamps.Asthe
loadcapacitanceincreases,thefeedbackloop’sphasemargindecreases,andtheclosedloop
bandwidthisreduced.Thisproducesgainpeakinginthefrequencyresponse,withovershootand
ringinginthestepresponse.Aunitygainbuffer(G=+1)isthemostsensitivetocapacitiveloads,but
allgainsshowthesamegeneralbehavior.
Whendrivinglargecapacitiveloadswiththeseopamps(e.g.,>100pFwhenG=+1),asmallseries
resistorattheoutput(RISOinFigure1)improvesthefeedbackloop’sphasemargin(stability)by
makingtheoutputloadresistiveathigherfrequencies.Itdoesnot,however,improvethebandwidth.
ToselectRISO,checkthefrequencyresponsepeaking(orstepresponseovershoot)onthebench.If
theresponseisreasonable,youdonotneedRISO.Otherwise,startRISOat1kΩandmodifyitsvalue
untiltheresponseisreasonable.
Figure1.IndirectlyDrivingHeavyCapacitiveLoad
AnimprovementcircuitisshowninFigure2.ItprovidesDCaccuracyaswellasACstability.RF
providestheDCaccuracybyconnectingtheinvertingsignalwiththeoutput,CFandRISOserveto
counteractthelossofphasemarginbyfeedingthehighfrequencycomponentoftheoutputsignal
backtotheamplifier’sinvertinginput,therebypreservingphasemarginintheoverallfeedbackloop.
Figure2.IndirectlyDrivingHeavyCapacitiveLoadwithDCAccuracy
LM2904，LM2902
www.cosine-ic.com 6Fornoninvertingconfiguration,therearetwootherswaystoincreasethephasemargin:(a)by
increasingtheamplifier’sgainor(b)byplacingacapacitorinparallelwiththefeedbackresistorto
counteracttheparasiticcapacitanceassociatedwithinvertingnode,asshowninFigure3.
Figure3.AddingaFeedbackCapacitorintheNoninvertingConfiguration
Power-SupplyBypassingandLayout
TheLM2904/2902operatefromasingle+3Vto+36Vsupplyordual±1.5Vto±18Vsupplies.For
single-supplyoperation,bypassthepowersupply+Vswitha0.1μFceramiccapacitorwhichshould
beplacedclosetothe+Vspin.Fordual-supplyoperation,boththe+Vsandthe-Vssuppliesshould
bebypassedtogroundwithseparate0.1μFceramiccapacitors.2.2μFtantalumcapacitorcanbe
addedforbetterperformance.
Thelengthofthecurrentpathisdirectlyproportionaltothemagnitudeofparasiticinductancesand
thusthehighfrequencyimpedanceofthepath.Highspeedcurrentsinaninductivegroundreturn
createanunwantedvoltagenoise.Broadgroundplaneareaswillreducetheparasiticinductance.
Thusagroundplanelayerisimportantforhighspeedcircuitdesign.
TypicalApplicationCircuits
DifferentialAmplifier
ThecircuitshowninFigure4performsthedifferentialfunction.Iftheresistorsratiosareequal(R4/
R3=R2/R1),thenVOUT=(VIP–VIN)×R2/R1+VREF.
LM2904，LM2902
www.cosine-ic.com 7
Figure4.DifferentialAmplifier
LowPassActiveFilter
Whenreceivinglow-levelsignals,limitingthebandwidthoftheincomingsignalsintothesystemis
oftenrequired.ThesimplestwaytoestablishthislimitedbandwidthistoplaceanRCfilteratthe
noninvertingterminaloftheamplifier.Ifevenmoreattenuationisneeded,amultiplepolefilteris
required.TheSallen-Keyfiltercanbeusedforthistask,asFigure5.Forbestresults,theamplifier
shouldhaveabandwidththatis8to10timesthefilterfrequencybandwidth.Failuretofollowthis
guidelinecanresultinreductionofphasemargin.Thelargevaluesoffeedbackresistorscancouple
withparasiticcapacitanceandcauseundesiredeffectssuchasringingoroscillationinhigh-speed
amplifiers.Keepresistorsvalueaslowaspossibleandconsistentwithoutputloadingconsideration.
Figure5.Two-PoleLow-PassSallen-KeyActiveFilter
LM2904，LM2902
www.cosine-ic.com 85.PackageInformation
5.1SOP8(PackageOutlineDimensions)
5.2MSOP8(PackageOutlineDimensions)

LM2904，LM2902
www.cosine-ic.com 95.3SOP14(PackageOutlineDimensions)

LM2904，LM2902
www.cosine-ic.com 105.4TSSOP14(PackageOutlineDimensions)
6.RelatedParts
PartNumber Description
COS6042 24kHz,0.5μA,Nano-PowerOpAmps,1.4Vto5.5VSupply
COS8042 160MHz,5.5mA,HighSpeedOpAmps,3Vto12VSupply
COS2172 10MHz,1.2mA,RRIOOpAmps,4.5to40VSupply
COS2333 350kHz,18μA,PrecisionOpAmps,1.8to5.5VSupply,ZeroDrift,Vos<10μV COS8552 1.5MHz,55μA,PrecisionOpAmps,1.8to5.5VSupply,ZeroDrift,Vos<10μV COS2388 9MHz,570μA,PrecisionOpAmps,1.8to5.5VSupply,ZeroDrift,Vos<10μV COS2227 8MHz,1.3mA,PrecisionOpAmps,4.5to36VSupply,Vos<50μV COS2182 5MHz,580μA,RRIOPrecisionOpAmps,4.5to40VSupply,Vos<50μV COS620 1.5MHz,1.3mA,InstrumentationAmps,4.5to36VSupply,Vos<50μV COSINA333150kHz,65μA,InstrumentationAmps,1.8to5.5VSupply,Vos<25μV