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LM56www.
ti.
comSNIS120G–APRIL2000–REVISEDFEBRUARY2013LM56DualOutputLowPowerThermostatCheckforSamples:LM561FEATURESDESCRIPTIONTheLM56isaprecisionlowpowerthermostat.
Two2DigitalOutputsSupportTTLLogicLevelsstabletemperaturetrippoints(VT1andVT2)areInternalTemperatureSensorgeneratedbydividingdowntheLM561.
250V2InternalComparatorswithHysteresisbandgapvoltagereferenceusing3externalresistors.
TheLM56hastwodigitaloutputs.
OUT1goesLOWInternalVoltageReferencewhenthetemperatureexceedsT1andgoesHIGHAvailablein8-pinSOICandVSSOPPackageswhenthethetemperaturegoesbelow(T1–THYST).
Similarly,OUT2goesLOWwhenthetemperatureAPPLICATIONSexceedsT2andgoesHIGHwhenthetemperaturegoesbelow(T2–THYST).
THYSTisaninternallyset5°CMicroprocessorThermalManagementtypicalhysteresis.
AppliancesTheLM56isavailableinan8-leadVSSOPsurfacePortableBatteryPowered3.
0Vor5VSystemsmountpackageandan8-leadSOIC.
FanControlIndustrialProcessControlHVACSystemsRemoteTemperatureSensingElectronicSystemProtectionTable1.
KeySpecificationsVALUEUNITPowerSupplyVoltage2.
7V–10VPowerSupplyCurrent230μA(max)VREF1.
250V±1%(max)HysteresisTemperature5°C(+6.
20mV/°CxT)+InternalTemperatureSensorOutputVoltagemV395mVTable2.
TemperatureTripPointAccuracyLM56BIMLM56CIM+25°C±2°C(max)±3°C(max)+25°Cto+85°C±2°C(max)±3°C(max)40°Cto+125°C±3°C(max)±4°C(max)1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Alltrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2000–2013,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comSimplifiedBlockDiagramandConnectionDiagramBlockDiagramTypicalApplicationVT1=1.
250Vx(R1)/(R1+R2+R3)VT2=1.
250Vx(R1+R2)/(R1+R2+R3)where:(R1+R2+R3)=27kΩandVT1orT2=[6.
20mV/°CxT]+395mVtherefore:R1=VT1/(1.
25V)x27kΩR2=(VT2/(1.
25V)x27kΩ)R1R3=27kΩR1R2Figure1.
MicroprocessorThermalManagementThesedeviceshavelimitedbuilt-inESDprotection.
TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
2SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
ti.
comSNIS120G–APRIL2000–REVISEDFEBRUARY2013AbsoluteMaximumRatings(1)InputVoltage12VInputCurrentatanypin(2)5mAPackageInputCurrent(2)20mAPackageDissipationatTA=25°C(3)900mWHumanBodyModel-Pin3Only800VAllotherpins1000VESDSusceptibility(4)MachineModel125VStorageTemperature65°Cto+150°C(1)AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.
OperatingRatingsindicateconditionsforwhichthedeviceisfunctional,butdonotguaranteespecificperformancelimits.
Forguaranteedspecificationsandtestconditions,seetheLM56ElectricalCharacteristics.
Theguaranteedspecificationsapplyonlyforthetestconditionslisted.
Someperformancecharacteristicsmaydegradewhenthedeviceisnotoperatedunderthelistedtestconditions.
(2)Whentheinputvoltage(VI)atanypinexceedsthepowersupply(VIV+),thecurrentatthatpinshouldbelimitedto5mA.
The20mAmaximumpackageinputcurrentratinglimitsthenumberofpinsthatcansafelyexceedthepowersupplieswithaninputcurrentof5mAtofour.
(3)ThemaximumpowerdissipationmustbederatedatelevatedtemperaturesandisdictatedbyTJmax(maximumjunctiontemperature),θJA(junctiontoambientthermalresistance)andTA(ambienttemperature).
ThemaximumallowablepowerdissipationatanytemperatureisPD=(TJmax–TA)/θJAorthenumbergivenintheAbsoluteMaximumRatings,whicheverislower.
Forthisdevice,TJmax=125°C.
Forthisdevicethetypicalthermalresistance(θJA)ofthedifferentpackagetypeswhenboardmountedfollow:(4)Thehumanbodymodelisa100pFcapacitordischargethrougha1.
5kΩresistorintoeachpin.
Themachinemodelisa200pFcapacitordischargeddirectlyintoeachpin.
OperatingRatings(1)(2)(3)OperatingTemperatureRangeTMIN≤TA≤TMAXLM56BIM,LM56CIM40°C≤TA≤+125°CPositiveSupplyVoltage(V+)+2.
7Vto+10VMaximumVOUT1andVOUT2+10V(1)AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.
OperatingRatingsindicateconditionsforwhichthedeviceisfunctional,butdonotguaranteespecificperformancelimits.
Forguaranteedspecificationsandtestconditions,seetheLM56ElectricalCharacteristics.
Theguaranteedspecificationsapplyonlyforthetestconditionslisted.
Someperformancecharacteristicsmaydegradewhenthedeviceisnotoperatedunderthelistedtestconditions.
(2)SolderingprocessmustcomplywithReflowTemperatureProfilespecifications.
Refertohttp://www.
ti.
com/packaging.
(3)Reflowtemperatureprofilesaredifferentforlead-freeandnon-lead-freepackages.
PackageTypeθJAD0008A110°C/WDGK0008A250°C/WCopyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comLM56ElectricalCharacteristicsThefollowingspecificationsapplyforV+=2.
7VDC,andVREFloadcurrent=50μAunlessotherwisespecified.
BoldfacelimitsapplyforTA=TJ=TMINtoTMAX;allotherlimitsTA=TJ=25°Cunlessotherwisespecified.
LM56BIMLM56CIMSymbolParameterConditionsTypical(1)Units(Limits)Limits(2)Limits(2)TemperatureSensorTripPointAccuracy(IncludesVREF,±2±3°C(max)ComparatorOffset,andTemperature+25°C≤TA≤+85°C±2±3°C(max)Sensitivityerrors)40°C≤TA≤+125°C±3±4°C(max)TripPointHysteresisTA=40°C433°C(min)66°C(max)TA=+25°C53.
53.
5°C(min)6.
56.
5°C(max)TA=+85°C64.
54.
5°C(min)7.
57.
5°C(max)TA=+125°C644°C(min)88°C(max)InternalTemperatureSensitivity+6.
20mV/°CTemperatureSensitivityError±2±3°C(max)±3±4°C(max)OutputImpedance1μA≤IL≤+40μA15001500Ω(max)LineRegulation+3.
0V≤V+≤+10V,–0.
72/+0.
3–0.
72/+0.
3mV/V(max)+25°C≤TA≤+85°C66+3.
0V≤V+≤+10V,–1.
14/+0.
6–1.
14/+0.
6mV/V(max)40°C≤TA<25°C11+2.
7V≤V+≤+3.
3V±2.
3±2.
3mV(max)VT1andVT2AnalogInputsIBIASAnalogInputBiasCurrent150300300nA(max)VINAnalogInputVoltageRangeV+1VGNDVVOSComparatorOffset288mV(max)VREFOutputVREFVREFNominal1.
250VVVREFError±1±1%(max)±12.
5±12.
5mV(max)ΔVREF/ΔV+LineRegulation+3.
0V≤V+≤+10V0.
130.
250.
25mV/V(max)+2.
7V≤V+≤+3.
3V0.
151.
11.
1mV(max)ΔVREF/ΔILLoadRegulationSourcing+30μA≤IL≤+50μA0.
150.
15mV/μA(max)(1)TypicalsareatTJ=TA=25°Candrepresentmostlikelyparametricnorm.
(2)LimitsareguaranteedtoTI'sAOQL(AverageOutgoingQualityLevel).
SymbolParameterConditionsTypical(1)Limits(2)Units(Limits)V+PowerSupplyISSupplyCurrentV+=+10V230μA(max)V+=+2.
7V230μA(max)DigitalOutputsIOUT("1")Logical"1"OutputLeakageCurrentV+=+5.
0V1μA(max)VOUT("0")Logical"0"OutputVoltageIOUT=+50μA0.
4V(max)(1)TypicalsareatTJ=TA=25°Candrepresentmostlikelyparametricnorm.
(2)LimitsareguaranteedtoTI'sAOQL(AverageOutgoingQualityLevel).
4SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
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comSNIS120G–APRIL2000–REVISEDFEBRUARY2013TypicalPerformanceCharacteristicsQuiescentCurrentVREFOutputVoltagevsvsTemperatureLoadCurrentFigure2.
Figure3.
OUT1andOUT2VoltageLevelsTripPointHysteresisvsvsLoadCurrentTemperatureFigure4.
Figure5.
TemperatureSensorOutputVoltageTemperatureSensorOutputAccuracyvsvsTemperatureTemperatureFigure6.
Figure7.
Copyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comTypicalPerformanceCharacteristics(continued)TripPointAccuracyComparatorBiasCurrentvsvsTemperatureTemperatureFigure8.
Figure9.
OUT1andOUT2LeakageCurrentVTEMPOutputLineRegulationvsvsTemperatureTemperatureFigure10.
Figure11.
VREFStart-UpResponseVTEMPStart-UpResponseFigure12.
Figure13.
6SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
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comSNIS120G–APRIL2000–REVISEDFEBRUARY2013FUNCTIONALDESCRIPTIONPinFunctionsV+Thisisthepositivesupplyvoltagepin.
Thispinshouldbebypassedwitha0.
1Fcapacitortoground.
GNDThisisthegroundpin.
VREFThisisthe1.
250Vbandgapvoltagereferenceoutputpin.
Inordertomaintaintrippointaccuracythispinshouldsourcea50Aload.
VTEMPThisisthetemperaturesensoroutputpin.
OUT1Thisisanopencollectordigitaloutput.
OUT1isactiveLOW.
ItgoesLOWwhenthetemperatureisgreaterthanT1andgoesHIGHwhenthetemperaturedropsbelowT1–5°C.
Thisoutputisnotintendedtodirectlydriveafanmotor.
OUT2Thisisanopencollectordigitaloutput.
OUT2isactiveLOW.
ItgoesLOWwhenthetemperatureisgreaterthantheT2setpointandgoesHIGHwhenthetemperatureislessthanT2–5°C.
Thisoutputisnotintendedtodirectlydriveafanmotor.
VT1ThisistheinputpinforthetemperaturetrippointvoltageforOUT1.
VT2ThisistheinputpinforthelowtemperaturetrippointvoltageforOUT2.
Copyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comVT1=1.
250Vx(R1)/(R1+R2+R3)VT2=1.
250Vx(R1+R2)/(R1+R2+R3)where:(R1+R2+R3)=27kΩandVT1orT2=[6.
20mV/°CxT]+395mVtherefore:R1=VT1/(1.
25V)x27kΩR2=(VT2/(1.
25V)x27k)Ω–R1R3=27kΩR1R2ApplicationHintsLM56TRIPPOINTACCURACYSPECIFICATIONForsimplicitythefollowingisananalysisofthetrippointaccuracyusingthesingleoutputconfigurationshowninFigure14withasetpointof82°C.
TripPointErrorVoltage=VTPE,ComparatorOffsetErrorforVT1ETemperatureSensorError=VTSEReferenceOutputError=VREFigure14.
SingleOutputConfiguration8SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
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comSNIS120G–APRIL2000–REVISEDFEBRUARY20131.
VTPE=±VT1EVTSE+VREWhere:2.
VT1E=±8mV(max)3.
VTSE=(6.
20mV/°C)x(±3°C)=±18.
6mV4.
VRE=1.
250Vx(±0.
01)R2/(R1+R2)UsingEquationsfromFigure1.
VT1=1.
25VxR2/(R1+R2)=6.
20mV/°C)(82°C)+395mVSolvingforR2/(R1+R2)=0.
7227then,5.
VRE=1.
250Vx(±0.
01)R2/(R1+R2)=(0.
0125)x(0.
7227)=±9.
03mVTheindividualerrorsdonotaddalgebraicallybecause,theoddsofalltheerrorsbeingattheirextremesarerare.
ThisisprovenbythefactthespecificationforthetrippointaccuracystatedintheLM56ElectricalCharacteristicsforthetemperaturerangeof40°Cto+125°C,forexample,isspecifiedat±3°CfortheLM56BIM.
Notethistrippointerrorspecificationdoesnotincludeanyerrorintroducedbythetoleranceoftheactualresistorsused,noranyerrorintroducedbypowersupplyvariation.
Iftheresistorshavea±0.
5%tolerance,anadditionalerrorof±0.
4°Cwillbeintroduced.
Thiserrorwillincreaseto±0.
8°Cwhenbothexternalresistorshavea±1%tolerance.
BIASCURRENTEFFECTONTRIPPOINTACCURACYBiascurrentforthecomparatorinputsis300nA(max)each,overthespecifiedtemperaturerangeandwillnotintroduceconsiderableerrorifthesumoftheresistorvaluesarekepttoabout27kΩasshowninthetypicalapplicationofFigure1.
Thisbiascurrentofonecomparatorinputwillnotflowifthetemperatureiswellbelowthetrippointlevel.
Asthetemperatureapproachestrippointlevelthebiascurrentwillstarttoflowintotheresistornetwork.
Whenthetemperaturesensoroutputisequaltothetrippointlevelthebiascurrentwillbe150nA(max).
Oncethetemperatureiswellabovethetrippointlevelthebiascurrentwillbe300nA(max).
Therefore,thefirsttrippointwillbeaffectedby150nAofbiascurrent.
Theleakagecurrentisverysmallwhenthecomparatorinputtransistorofthedifferentpairisoff(seeFigure15).
Theeffectofthebiascurrentonthefirsttrippointcanbedefinedbythefollowingequations:(1)whereIB=300nA(themaximumspecifiederror).
Theeffectofthebiascurrentonthesecondtrippointcanbedefinedbythefollowingequations:(2)whereIB=300nA(themaximumspecifiederror).
Thecloserthetwotrippointsaretoeachotherthemoresignificanttheerroris.
WorstcasewouldbewhenVT1=VT2=VREF/2.
Copyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comFigure15.
SimplifiedSchematicMOUNTINGCONSIDERATIONSThemajorityofthetemperaturethattheLM56ismeasuringisthetemperatureofitsleads.
Therefore,whentheLM56isplacedonaprintedcircuitboard,itisnotsensingthetemperatureoftheambientair.
Itisactuallysensingthetemperaturedifferenceoftheairandthelandsandprintedcircuitboardthattheleadsareattachedto.
ThemostaccuratetemperaturesensingisobtainedwhentheambienttemperatureisequivalenttotheLM56'sleadtemperature.
AswithanyIC,theLM56andaccompanyingwiringandcircuitsmustbekeptinsulatedanddry,toavoidleakageandcorrosion.
Thisisespeciallytrueifthecircuitoperatesatcoldtemperatureswherecondensationcanoccur.
Printed-circuitcoatingsareoftenusedtoensurethatmoisturecannotcorrodetheLM56oritsconnections.
10SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
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comSNIS120G–APRIL2000–REVISEDFEBRUARY2013VREFANDVTEMPCAPACITIVELOADINGFigure16.
LoadingofVREFandVTEMPTheLM56VREFandVTEMPoutputshandlecapacitiveloadingwell.
Withoutanyspecialprecautions,theseoutputscandriveanycapacitiveloadasshowninFigure16.
NOISYENVIRONMENTSOverthespecifiedtemperaturerangetheLM56VTEMPoutputhasamaximumoutputimpedanceof1500Ω.
Inanextremelynoisyenvironmentitmaybenecessarytoaddsomefilteringtominimizenoisepickup.
Itisrecommendedthat0.
1μFbeaddedfromV+toGNDtobypassthepowersupplyvoltage,asshowninFigure16.
InanoisyenvironmentitmaybenecessarytoaddacapacitorfromtheVTEMPoutputtoground.
A1μFoutputcapacitorwiththe1500Ωoutputimpedancewillforma106Hzlowpassfilter.
SincethethermaltimeconstantoftheVTEMPoutputismuchslowerthanthe9.
4mstimeconstantformedbytheRC,theoverallresponsetimeoftheVTEMPoutputwillnotbesignificantlyaffected.
FormuchlargercapacitorsthisadditionaltimelagwillincreasetheoverallresponsetimeoftheLM56.
APPLICATIONSCIRCUITSFigure17.
ReducingErrorsCausedbyBiasCurrentCopyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comThecircuitshowninFigure17willreducetheeffectivebiascurrenterrorforVT2asdiscussedinSection3.
0tobeequivalenttotheerrortermofVT1.
Forthiscircuittheeffectofthebiascurrentonthefirsttrippointcanbedefinedbythefollowingequations:(3)whereIB=300nA(themaximumspecifiederror).
Similarly,biascurrentaffectonVT2canbedefinedby:(4)whereIB=300nA(themaximumspecifiederror).
ThecurrentshowninFigure18isasimpleovertemperaturedetectorforpowerdevices.
Inthisexample,anaudiopoweramplifierICisboltedtoaheatsinkandanLM56CelsiustemperaturesensorismountedonaPCboardthatisboltedtotheheatsinknearthepoweramplifier.
Toensurethatthesensingelementisatthesametemperatureastheheatsink,thesensor'sleadsaremountedtopadsthathavefeedthroughstothebacksideofthePCboard.
SincetheLM56issensingthetemperatureoftheactualPCboardthebacksideofthePCboardalsohaslargegroundplanetohelpconducttheheattothedevice.
Thecomparator'soutputgoeslowiftheheatsinktemperaturerisesaboveathresholdsetbyR1,R2,andthevoltagereference.
Thisfaultdetectionoutputfromthecomparatornowcanbeusedtoturnonacoolingfan.
Thecircuitasshownindesigntoturnthefanonwhenheatsinktemperatureexceedsabout80°C,andtoturnthefanoffwhentheheatsinktemperaturefallsbelowapproximately75°C.
Figure18.
AudioPowerAmplifierOvertemperatureDetector12SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
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comSNIS120G–APRIL2000–REVISEDFEBRUARY2013Figure19.
SimpleThermostatCopyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comREVISIONHISTORYChangesfromRevisionF(February2013)toRevisionGPageChangedlayoutofNationalDataSheettoTIformat1314SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesLM56BIMNRNDSOICD895Non-RoHS&Non-GreenCallTICallTI-40to125LM56BIMLM56BIM/NOPBACTIVESOICD895RoHS&GreenSNLevel-1-260C-UNLIM-40to125LM56BIMLM56BIMM/NOPBACTIVEVSSOPDGK81000RoHS&GreenSNLevel-1-260C-UNLIM-40to125T02BLM56BIMMX/NOPBACTIVEVSSOPDGK83500RoHS&GreenSNLevel-1-260C-UNLIM-40to125T02BLM56BIMX/NOPBACTIVESOICD82500RoHS&GreenSNLevel-1-260C-UNLIM-40to125LM56BIMLM56CIMNRNDSOICD895Non-RoHS&Non-GreenCallTICallTI-40to125LM56CIMLM56CIM/NOPBACTIVESOICD895RoHS&GreenSNLevel-1-260C-UNLIM-40to125LM56CIMLM56CIMM/NOPBACTIVEVSSOPDGK81000RoHS&GreenSNLevel-1-260C-UNLIM-40to125T02CLM56CIMMX/NOPBACTIVEVSSOPDGK83500RoHS&GreenSNLevel-1-260C-UNLIM-40to125T02CLM56CIMXNRNDSOICD82500Non-RoHS&Non-GreenCallTICallTI-40to125LM56CIMLM56CIMX/NOPBACTIVESOICD82500RoHS&GreenSNLevel-1-260C-UNLIM-40to125LM56CIM(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page2(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.
TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
TAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantLM56BIMM/NOPBVSSOPDGK81000178.
012.
45.
33.
41.
48.
012.
0Q1LM56BIMMX/NOPBVSSOPDGK83500330.
012.
45.
33.
41.
48.
012.
0Q1LM56BIMX/NOPBSOICD82500330.
012.
46.
55.
42.
08.
012.
0Q1LM56CIMM/NOPBVSSOPDGK81000178.
012.
45.
33.
41.
48.
012.
0Q1LM56CIMMX/NOPBVSSOPDGK83500330.
012.
45.
33.
41.
48.
012.
0Q1LM56CIMXSOICD82500330.
012.
46.
55.
42.
08.
012.
0Q1LM56CIMX/NOPBSOICD82500330.
012.
46.
55.
42.
08.
012.
0Q1PACKAGEMATERIALSINFORMATIONwww.
ti.
com29-Sep-2019PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)LM56BIMM/NOPBVSSOPDGK81000210.
0185.
035.
0LM56BIMMX/NOPBVSSOPDGK83500367.
0367.
035.
0LM56BIMX/NOPBSOICD82500367.
0367.
035.
0LM56CIMM/NOPBVSSOPDGK81000210.
0185.
035.
0LM56CIMMX/NOPBVSSOPDGK83500367.
0367.
035.
0LM56CIMXSOICD82500367.
0367.
035.
0LM56CIMX/NOPBSOICD82500367.
0367.
035.
0PACKAGEMATERIALSINFORMATIONwww.
ti.
com29-Sep-2019PackMaterials-Page2www.
ti.
comPACKAGEOUTLINEC.
228-.
244TYP[5.
80-6.
19].
069MAX[1.
75]6X.
050[1.
27]8X.
012-.
020[0.
31-0.
51]2X.
150[3.
81].
005-.
010TYP[0.
13-0.
25]0-8.
004-.
010[0.
11-0.
25].
010[0.
25].
016-.
050[0.
41-1.
27]4X(0-15)A.
189-.
197[4.
81-5.
00]NOTE3B.
150-.
157[3.
81-3.
98]NOTE44X(0-15)(.
041)[1.
04]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:1.
Lineardimensionsareininches[millimeters].
Dimensionsinparenthesisareforreferenceonly.
Controllingdimensionsareininches.
DimensioningandtolerancingperASMEY14.
5M.
2.
Thisdrawingissubjecttochangewithoutnotice.
3.
Thisdimensiondoesnotincludemoldflash,protrusions,orgateburrs.
Moldflash,protrusions,orgateburrsshallnotexceed.
006[0.
15]perside.
4.
Thisdimensiondoesnotincludeinterleadflash.
5.
ReferenceJEDECregistrationMS-012,variationAA.
18.
010[0.
25]CAB54PIN1IDAREASEATINGPLANE.
004[0.
1]CSEEDETAILADETAILATYPICALSCALE2.
800www.
ti.
comEXAMPLEBOARDLAYOUT.
0028MAX[0.
07]ALLAROUND.
0028MIN[0.
07]ALLAROUND(.
213)[5.
4]6X(.
050)[1.
27]8X(.
061)[1.
55]8X(.
024)[0.
6](R.
002)TYP[0.
05]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:(continued)6.
PublicationIPC-7351mayhavealternatedesigns.
7.
Soldermasktolerancesbetweenandaroundsignalpadscanvarybasedonboardfabricationsite.
METALSOLDERMASKOPENINGNONSOLDERMASKDEFINEDSOLDERMASKDETAILSEXPOSEDMETALOPENINGSOLDERMASKMETALUNDERSOLDERMASKSOLDERMASKDEFINEDEXPOSEDMETALLANDPATTERNEXAMPLEEXPOSEDMETALSHOWNSCALE:8XSYMM1458SEEDETAILSSYMMwww.
ti.
comEXAMPLESTENCILDESIGN8X(.
061)[1.
55]8X(.
024)[0.
6]6X(.
050)[1.
27](.
213)[5.
4](R.
002)TYP[0.
05]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:(continued)8.
Lasercuttingapertureswithtrapezoidalwallsandroundedcornersmayofferbetterpasterelease.
IPC-7525mayhavealternatedesignrecommendations.
9.
Boardassemblysitemayhavedifferentrecommendationsforstencildesign.
SOLDERPASTEEXAMPLEBASEDON.
005INCH[0.
125MM]THICKSTENCILSCALE:8XSYMMSYMM1458IMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(INCLUDINGDATASHEETS),DESIGNRESOURCES(INCLUDINGREFERENCEDESIGNS),APPLICATIONOROTHERDESIGNADVICE,WEBTOOLS,SAFETYINFORMATION,ANDOTHERRESOURCES"ASIS"ANDWITHALLFAULTS,ANDDISCLAIMSALLWARRANTIES,EXPRESSANDIMPLIED,INCLUDINGWITHOUTLIMITATIONANYIMPLIEDWARRANTIESOFMERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEORNON-INFRINGEMENTOFTHIRDPARTYINTELLECTUALPROPERTYRIGHTS.
TheseresourcesareintendedforskilleddevelopersdesigningwithTIproducts.
Youaresolelyresponsiblefor(1)selectingtheappropriateTIproductsforyourapplication,(2)designing,validatingandtestingyourapplication,and(3)ensuringyourapplicationmeetsapplicablestandards,andanyothersafety,security,orotherrequirements.
Theseresourcesaresubjecttochangewithoutnotice.
TIgrantsyoupermissiontousetheseresourcesonlyfordevelopmentofanapplicationthatusestheTIproductsdescribedintheresource.
Otherreproductionanddisplayoftheseresourcesisprohibited.
NolicenseisgrantedtoanyotherTIintellectualpropertyrightortoanythirdpartyintellectualpropertyright.
TIdisclaimsresponsibilityfor,andyouwillfullyindemnifyTIanditsrepresentativesagainst,anyclaims,damages,costs,losses,andliabilitiesarisingoutofyouruseoftheseresources.
TI'sproductsareprovidedsubjecttoTI'sTermsofSale(www.
ti.
com/legal/termsofsale.
html)orotherapplicabletermsavailableeitheronti.
comorprovidedinconjunctionwithsuchTIproducts.
TI'sprovisionoftheseresourcesdoesnotexpandorotherwisealterTI'sapplicablewarrantiesorwarrantydisclaimersforTIproducts.
MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated
ti.
comSNIS120G–APRIL2000–REVISEDFEBRUARY2013LM56DualOutputLowPowerThermostatCheckforSamples:LM561FEATURESDESCRIPTIONTheLM56isaprecisionlowpowerthermostat.
Two2DigitalOutputsSupportTTLLogicLevelsstabletemperaturetrippoints(VT1andVT2)areInternalTemperatureSensorgeneratedbydividingdowntheLM561.
250V2InternalComparatorswithHysteresisbandgapvoltagereferenceusing3externalresistors.
TheLM56hastwodigitaloutputs.
OUT1goesLOWInternalVoltageReferencewhenthetemperatureexceedsT1andgoesHIGHAvailablein8-pinSOICandVSSOPPackageswhenthethetemperaturegoesbelow(T1–THYST).
Similarly,OUT2goesLOWwhenthetemperatureAPPLICATIONSexceedsT2andgoesHIGHwhenthetemperaturegoesbelow(T2–THYST).
THYSTisaninternallyset5°CMicroprocessorThermalManagementtypicalhysteresis.
AppliancesTheLM56isavailableinan8-leadVSSOPsurfacePortableBatteryPowered3.
0Vor5VSystemsmountpackageandan8-leadSOIC.
FanControlIndustrialProcessControlHVACSystemsRemoteTemperatureSensingElectronicSystemProtectionTable1.
KeySpecificationsVALUEUNITPowerSupplyVoltage2.
7V–10VPowerSupplyCurrent230μA(max)VREF1.
250V±1%(max)HysteresisTemperature5°C(+6.
20mV/°CxT)+InternalTemperatureSensorOutputVoltagemV395mVTable2.
TemperatureTripPointAccuracyLM56BIMLM56CIM+25°C±2°C(max)±3°C(max)+25°Cto+85°C±2°C(max)±3°C(max)40°Cto+125°C±3°C(max)±4°C(max)1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Alltrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2000–2013,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comSimplifiedBlockDiagramandConnectionDiagramBlockDiagramTypicalApplicationVT1=1.
250Vx(R1)/(R1+R2+R3)VT2=1.
250Vx(R1+R2)/(R1+R2+R3)where:(R1+R2+R3)=27kΩandVT1orT2=[6.
20mV/°CxT]+395mVtherefore:R1=VT1/(1.
25V)x27kΩR2=(VT2/(1.
25V)x27kΩ)R1R3=27kΩR1R2Figure1.
MicroprocessorThermalManagementThesedeviceshavelimitedbuilt-inESDprotection.
TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
2SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
ti.
comSNIS120G–APRIL2000–REVISEDFEBRUARY2013AbsoluteMaximumRatings(1)InputVoltage12VInputCurrentatanypin(2)5mAPackageInputCurrent(2)20mAPackageDissipationatTA=25°C(3)900mWHumanBodyModel-Pin3Only800VAllotherpins1000VESDSusceptibility(4)MachineModel125VStorageTemperature65°Cto+150°C(1)AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.
OperatingRatingsindicateconditionsforwhichthedeviceisfunctional,butdonotguaranteespecificperformancelimits.
Forguaranteedspecificationsandtestconditions,seetheLM56ElectricalCharacteristics.
Theguaranteedspecificationsapplyonlyforthetestconditionslisted.
Someperformancecharacteristicsmaydegradewhenthedeviceisnotoperatedunderthelistedtestconditions.
(2)Whentheinputvoltage(VI)atanypinexceedsthepowersupply(VIV+),thecurrentatthatpinshouldbelimitedto5mA.
The20mAmaximumpackageinputcurrentratinglimitsthenumberofpinsthatcansafelyexceedthepowersupplieswithaninputcurrentof5mAtofour.
(3)ThemaximumpowerdissipationmustbederatedatelevatedtemperaturesandisdictatedbyTJmax(maximumjunctiontemperature),θJA(junctiontoambientthermalresistance)andTA(ambienttemperature).
ThemaximumallowablepowerdissipationatanytemperatureisPD=(TJmax–TA)/θJAorthenumbergivenintheAbsoluteMaximumRatings,whicheverislower.
Forthisdevice,TJmax=125°C.
Forthisdevicethetypicalthermalresistance(θJA)ofthedifferentpackagetypeswhenboardmountedfollow:(4)Thehumanbodymodelisa100pFcapacitordischargethrougha1.
5kΩresistorintoeachpin.
Themachinemodelisa200pFcapacitordischargeddirectlyintoeachpin.
OperatingRatings(1)(2)(3)OperatingTemperatureRangeTMIN≤TA≤TMAXLM56BIM,LM56CIM40°C≤TA≤+125°CPositiveSupplyVoltage(V+)+2.
7Vto+10VMaximumVOUT1andVOUT2+10V(1)AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.
OperatingRatingsindicateconditionsforwhichthedeviceisfunctional,butdonotguaranteespecificperformancelimits.
Forguaranteedspecificationsandtestconditions,seetheLM56ElectricalCharacteristics.
Theguaranteedspecificationsapplyonlyforthetestconditionslisted.
Someperformancecharacteristicsmaydegradewhenthedeviceisnotoperatedunderthelistedtestconditions.
(2)SolderingprocessmustcomplywithReflowTemperatureProfilespecifications.
Refertohttp://www.
ti.
com/packaging.
(3)Reflowtemperatureprofilesaredifferentforlead-freeandnon-lead-freepackages.
PackageTypeθJAD0008A110°C/WDGK0008A250°C/WCopyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comLM56ElectricalCharacteristicsThefollowingspecificationsapplyforV+=2.
7VDC,andVREFloadcurrent=50μAunlessotherwisespecified.
BoldfacelimitsapplyforTA=TJ=TMINtoTMAX;allotherlimitsTA=TJ=25°Cunlessotherwisespecified.
LM56BIMLM56CIMSymbolParameterConditionsTypical(1)Units(Limits)Limits(2)Limits(2)TemperatureSensorTripPointAccuracy(IncludesVREF,±2±3°C(max)ComparatorOffset,andTemperature+25°C≤TA≤+85°C±2±3°C(max)Sensitivityerrors)40°C≤TA≤+125°C±3±4°C(max)TripPointHysteresisTA=40°C433°C(min)66°C(max)TA=+25°C53.
53.
5°C(min)6.
56.
5°C(max)TA=+85°C64.
54.
5°C(min)7.
57.
5°C(max)TA=+125°C644°C(min)88°C(max)InternalTemperatureSensitivity+6.
20mV/°CTemperatureSensitivityError±2±3°C(max)±3±4°C(max)OutputImpedance1μA≤IL≤+40μA15001500Ω(max)LineRegulation+3.
0V≤V+≤+10V,–0.
72/+0.
3–0.
72/+0.
3mV/V(max)+25°C≤TA≤+85°C66+3.
0V≤V+≤+10V,–1.
14/+0.
6–1.
14/+0.
6mV/V(max)40°C≤TA<25°C11+2.
7V≤V+≤+3.
3V±2.
3±2.
3mV(max)VT1andVT2AnalogInputsIBIASAnalogInputBiasCurrent150300300nA(max)VINAnalogInputVoltageRangeV+1VGNDVVOSComparatorOffset288mV(max)VREFOutputVREFVREFNominal1.
250VVVREFError±1±1%(max)±12.
5±12.
5mV(max)ΔVREF/ΔV+LineRegulation+3.
0V≤V+≤+10V0.
130.
250.
25mV/V(max)+2.
7V≤V+≤+3.
3V0.
151.
11.
1mV(max)ΔVREF/ΔILLoadRegulationSourcing+30μA≤IL≤+50μA0.
150.
15mV/μA(max)(1)TypicalsareatTJ=TA=25°Candrepresentmostlikelyparametricnorm.
(2)LimitsareguaranteedtoTI'sAOQL(AverageOutgoingQualityLevel).
SymbolParameterConditionsTypical(1)Limits(2)Units(Limits)V+PowerSupplyISSupplyCurrentV+=+10V230μA(max)V+=+2.
7V230μA(max)DigitalOutputsIOUT("1")Logical"1"OutputLeakageCurrentV+=+5.
0V1μA(max)VOUT("0")Logical"0"OutputVoltageIOUT=+50μA0.
4V(max)(1)TypicalsareatTJ=TA=25°Candrepresentmostlikelyparametricnorm.
(2)LimitsareguaranteedtoTI'sAOQL(AverageOutgoingQualityLevel).
4SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
ti.
comSNIS120G–APRIL2000–REVISEDFEBRUARY2013TypicalPerformanceCharacteristicsQuiescentCurrentVREFOutputVoltagevsvsTemperatureLoadCurrentFigure2.
Figure3.
OUT1andOUT2VoltageLevelsTripPointHysteresisvsvsLoadCurrentTemperatureFigure4.
Figure5.
TemperatureSensorOutputVoltageTemperatureSensorOutputAccuracyvsvsTemperatureTemperatureFigure6.
Figure7.
Copyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comTypicalPerformanceCharacteristics(continued)TripPointAccuracyComparatorBiasCurrentvsvsTemperatureTemperatureFigure8.
Figure9.
OUT1andOUT2LeakageCurrentVTEMPOutputLineRegulationvsvsTemperatureTemperatureFigure10.
Figure11.
VREFStart-UpResponseVTEMPStart-UpResponseFigure12.
Figure13.
6SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
ti.
comSNIS120G–APRIL2000–REVISEDFEBRUARY2013FUNCTIONALDESCRIPTIONPinFunctionsV+Thisisthepositivesupplyvoltagepin.
Thispinshouldbebypassedwitha0.
1Fcapacitortoground.
GNDThisisthegroundpin.
VREFThisisthe1.
250Vbandgapvoltagereferenceoutputpin.
Inordertomaintaintrippointaccuracythispinshouldsourcea50Aload.
VTEMPThisisthetemperaturesensoroutputpin.
OUT1Thisisanopencollectordigitaloutput.
OUT1isactiveLOW.
ItgoesLOWwhenthetemperatureisgreaterthanT1andgoesHIGHwhenthetemperaturedropsbelowT1–5°C.
Thisoutputisnotintendedtodirectlydriveafanmotor.
OUT2Thisisanopencollectordigitaloutput.
OUT2isactiveLOW.
ItgoesLOWwhenthetemperatureisgreaterthantheT2setpointandgoesHIGHwhenthetemperatureislessthanT2–5°C.
Thisoutputisnotintendedtodirectlydriveafanmotor.
VT1ThisistheinputpinforthetemperaturetrippointvoltageforOUT1.
VT2ThisistheinputpinforthelowtemperaturetrippointvoltageforOUT2.
Copyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comVT1=1.
250Vx(R1)/(R1+R2+R3)VT2=1.
250Vx(R1+R2)/(R1+R2+R3)where:(R1+R2+R3)=27kΩandVT1orT2=[6.
20mV/°CxT]+395mVtherefore:R1=VT1/(1.
25V)x27kΩR2=(VT2/(1.
25V)x27k)Ω–R1R3=27kΩR1R2ApplicationHintsLM56TRIPPOINTACCURACYSPECIFICATIONForsimplicitythefollowingisananalysisofthetrippointaccuracyusingthesingleoutputconfigurationshowninFigure14withasetpointof82°C.
TripPointErrorVoltage=VTPE,ComparatorOffsetErrorforVT1ETemperatureSensorError=VTSEReferenceOutputError=VREFigure14.
SingleOutputConfiguration8SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
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comSNIS120G–APRIL2000–REVISEDFEBRUARY20131.
VTPE=±VT1EVTSE+VREWhere:2.
VT1E=±8mV(max)3.
VTSE=(6.
20mV/°C)x(±3°C)=±18.
6mV4.
VRE=1.
250Vx(±0.
01)R2/(R1+R2)UsingEquationsfromFigure1.
VT1=1.
25VxR2/(R1+R2)=6.
20mV/°C)(82°C)+395mVSolvingforR2/(R1+R2)=0.
7227then,5.
VRE=1.
250Vx(±0.
01)R2/(R1+R2)=(0.
0125)x(0.
7227)=±9.
03mVTheindividualerrorsdonotaddalgebraicallybecause,theoddsofalltheerrorsbeingattheirextremesarerare.
ThisisprovenbythefactthespecificationforthetrippointaccuracystatedintheLM56ElectricalCharacteristicsforthetemperaturerangeof40°Cto+125°C,forexample,isspecifiedat±3°CfortheLM56BIM.
Notethistrippointerrorspecificationdoesnotincludeanyerrorintroducedbythetoleranceoftheactualresistorsused,noranyerrorintroducedbypowersupplyvariation.
Iftheresistorshavea±0.
5%tolerance,anadditionalerrorof±0.
4°Cwillbeintroduced.
Thiserrorwillincreaseto±0.
8°Cwhenbothexternalresistorshavea±1%tolerance.
BIASCURRENTEFFECTONTRIPPOINTACCURACYBiascurrentforthecomparatorinputsis300nA(max)each,overthespecifiedtemperaturerangeandwillnotintroduceconsiderableerrorifthesumoftheresistorvaluesarekepttoabout27kΩasshowninthetypicalapplicationofFigure1.
Thisbiascurrentofonecomparatorinputwillnotflowifthetemperatureiswellbelowthetrippointlevel.
Asthetemperatureapproachestrippointlevelthebiascurrentwillstarttoflowintotheresistornetwork.
Whenthetemperaturesensoroutputisequaltothetrippointlevelthebiascurrentwillbe150nA(max).
Oncethetemperatureiswellabovethetrippointlevelthebiascurrentwillbe300nA(max).
Therefore,thefirsttrippointwillbeaffectedby150nAofbiascurrent.
Theleakagecurrentisverysmallwhenthecomparatorinputtransistorofthedifferentpairisoff(seeFigure15).
Theeffectofthebiascurrentonthefirsttrippointcanbedefinedbythefollowingequations:(1)whereIB=300nA(themaximumspecifiederror).
Theeffectofthebiascurrentonthesecondtrippointcanbedefinedbythefollowingequations:(2)whereIB=300nA(themaximumspecifiederror).
Thecloserthetwotrippointsaretoeachotherthemoresignificanttheerroris.
WorstcasewouldbewhenVT1=VT2=VREF/2.
Copyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comFigure15.
SimplifiedSchematicMOUNTINGCONSIDERATIONSThemajorityofthetemperaturethattheLM56ismeasuringisthetemperatureofitsleads.
Therefore,whentheLM56isplacedonaprintedcircuitboard,itisnotsensingthetemperatureoftheambientair.
Itisactuallysensingthetemperaturedifferenceoftheairandthelandsandprintedcircuitboardthattheleadsareattachedto.
ThemostaccuratetemperaturesensingisobtainedwhentheambienttemperatureisequivalenttotheLM56'sleadtemperature.
AswithanyIC,theLM56andaccompanyingwiringandcircuitsmustbekeptinsulatedanddry,toavoidleakageandcorrosion.
Thisisespeciallytrueifthecircuitoperatesatcoldtemperatureswherecondensationcanoccur.
Printed-circuitcoatingsareoftenusedtoensurethatmoisturecannotcorrodetheLM56oritsconnections.
10SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
ti.
comSNIS120G–APRIL2000–REVISEDFEBRUARY2013VREFANDVTEMPCAPACITIVELOADINGFigure16.
LoadingofVREFandVTEMPTheLM56VREFandVTEMPoutputshandlecapacitiveloadingwell.
Withoutanyspecialprecautions,theseoutputscandriveanycapacitiveloadasshowninFigure16.
NOISYENVIRONMENTSOverthespecifiedtemperaturerangetheLM56VTEMPoutputhasamaximumoutputimpedanceof1500Ω.
Inanextremelynoisyenvironmentitmaybenecessarytoaddsomefilteringtominimizenoisepickup.
Itisrecommendedthat0.
1μFbeaddedfromV+toGNDtobypassthepowersupplyvoltage,asshowninFigure16.
InanoisyenvironmentitmaybenecessarytoaddacapacitorfromtheVTEMPoutputtoground.
A1μFoutputcapacitorwiththe1500Ωoutputimpedancewillforma106Hzlowpassfilter.
SincethethermaltimeconstantoftheVTEMPoutputismuchslowerthanthe9.
4mstimeconstantformedbytheRC,theoverallresponsetimeoftheVTEMPoutputwillnotbesignificantlyaffected.
FormuchlargercapacitorsthisadditionaltimelagwillincreasetheoverallresponsetimeoftheLM56.
APPLICATIONSCIRCUITSFigure17.
ReducingErrorsCausedbyBiasCurrentCopyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comThecircuitshowninFigure17willreducetheeffectivebiascurrenterrorforVT2asdiscussedinSection3.
0tobeequivalenttotheerrortermofVT1.
Forthiscircuittheeffectofthebiascurrentonthefirsttrippointcanbedefinedbythefollowingequations:(3)whereIB=300nA(themaximumspecifiederror).
Similarly,biascurrentaffectonVT2canbedefinedby:(4)whereIB=300nA(themaximumspecifiederror).
ThecurrentshowninFigure18isasimpleovertemperaturedetectorforpowerdevices.
Inthisexample,anaudiopoweramplifierICisboltedtoaheatsinkandanLM56CelsiustemperaturesensorismountedonaPCboardthatisboltedtotheheatsinknearthepoweramplifier.
Toensurethatthesensingelementisatthesametemperatureastheheatsink,thesensor'sleadsaremountedtopadsthathavefeedthroughstothebacksideofthePCboard.
SincetheLM56issensingthetemperatureoftheactualPCboardthebacksideofthePCboardalsohaslargegroundplanetohelpconducttheheattothedevice.
Thecomparator'soutputgoeslowiftheheatsinktemperaturerisesaboveathresholdsetbyR1,R2,andthevoltagereference.
Thisfaultdetectionoutputfromthecomparatornowcanbeusedtoturnonacoolingfan.
Thecircuitasshownindesigntoturnthefanonwhenheatsinktemperatureexceedsabout80°C,andtoturnthefanoffwhentheheatsinktemperaturefallsbelowapproximately75°C.
Figure18.
AudioPowerAmplifierOvertemperatureDetector12SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56LM56www.
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comSNIS120G–APRIL2000–REVISEDFEBRUARY2013Figure19.
SimpleThermostatCopyright2000–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLinks:LM56LM56SNIS120G–APRIL2000–REVISEDFEBRUARY2013www.
ti.
comREVISIONHISTORYChangesfromRevisionF(February2013)toRevisionGPageChangedlayoutofNationalDataSheettoTIformat1314SubmitDocumentationFeedbackCopyright2000–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM56PACKAGEOPTIONADDENDUMwww.
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com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesLM56BIMNRNDSOICD895Non-RoHS&Non-GreenCallTICallTI-40to125LM56BIMLM56BIM/NOPBACTIVESOICD895RoHS&GreenSNLevel-1-260C-UNLIM-40to125LM56BIMLM56BIMM/NOPBACTIVEVSSOPDGK81000RoHS&GreenSNLevel-1-260C-UNLIM-40to125T02BLM56BIMMX/NOPBACTIVEVSSOPDGK83500RoHS&GreenSNLevel-1-260C-UNLIM-40to125T02BLM56BIMX/NOPBACTIVESOICD82500RoHS&GreenSNLevel-1-260C-UNLIM-40to125LM56BIMLM56CIMNRNDSOICD895Non-RoHS&Non-GreenCallTICallTI-40to125LM56CIMLM56CIM/NOPBACTIVESOICD895RoHS&GreenSNLevel-1-260C-UNLIM-40to125LM56CIMLM56CIMM/NOPBACTIVEVSSOPDGK81000RoHS&GreenSNLevel-1-260C-UNLIM-40to125T02CLM56CIMMX/NOPBACTIVEVSSOPDGK83500RoHS&GreenSNLevel-1-260C-UNLIM-40to125T02CLM56CIMXNRNDSOICD82500Non-RoHS&Non-GreenCallTICallTI-40to125LM56CIMLM56CIMX/NOPBACTIVESOICD82500RoHS&GreenSNLevel-1-260C-UNLIM-40to125LM56CIM(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page2(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.
TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
TAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantLM56BIMM/NOPBVSSOPDGK81000178.
012.
45.
33.
41.
48.
012.
0Q1LM56BIMMX/NOPBVSSOPDGK83500330.
012.
45.
33.
41.
48.
012.
0Q1LM56BIMX/NOPBSOICD82500330.
012.
46.
55.
42.
08.
012.
0Q1LM56CIMM/NOPBVSSOPDGK81000178.
012.
45.
33.
41.
48.
012.
0Q1LM56CIMMX/NOPBVSSOPDGK83500330.
012.
45.
33.
41.
48.
012.
0Q1LM56CIMXSOICD82500330.
012.
46.
55.
42.
08.
012.
0Q1LM56CIMX/NOPBSOICD82500330.
012.
46.
55.
42.
08.
012.
0Q1PACKAGEMATERIALSINFORMATIONwww.
ti.
com29-Sep-2019PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)LM56BIMM/NOPBVSSOPDGK81000210.
0185.
035.
0LM56BIMMX/NOPBVSSOPDGK83500367.
0367.
035.
0LM56BIMX/NOPBSOICD82500367.
0367.
035.
0LM56CIMM/NOPBVSSOPDGK81000210.
0185.
035.
0LM56CIMMX/NOPBVSSOPDGK83500367.
0367.
035.
0LM56CIMXSOICD82500367.
0367.
035.
0LM56CIMX/NOPBSOICD82500367.
0367.
035.
0PACKAGEMATERIALSINFORMATIONwww.
ti.
com29-Sep-2019PackMaterials-Page2www.
ti.
comPACKAGEOUTLINEC.
228-.
244TYP[5.
80-6.
19].
069MAX[1.
75]6X.
050[1.
27]8X.
012-.
020[0.
31-0.
51]2X.
150[3.
81].
005-.
010TYP[0.
13-0.
25]0-8.
004-.
010[0.
11-0.
25].
010[0.
25].
016-.
050[0.
41-1.
27]4X(0-15)A.
189-.
197[4.
81-5.
00]NOTE3B.
150-.
157[3.
81-3.
98]NOTE44X(0-15)(.
041)[1.
04]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:1.
Lineardimensionsareininches[millimeters].
Dimensionsinparenthesisareforreferenceonly.
Controllingdimensionsareininches.
DimensioningandtolerancingperASMEY14.
5M.
2.
Thisdrawingissubjecttochangewithoutnotice.
3.
Thisdimensiondoesnotincludemoldflash,protrusions,orgateburrs.
Moldflash,protrusions,orgateburrsshallnotexceed.
006[0.
15]perside.
4.
Thisdimensiondoesnotincludeinterleadflash.
5.
ReferenceJEDECregistrationMS-012,variationAA.
18.
010[0.
25]CAB54PIN1IDAREASEATINGPLANE.
004[0.
1]CSEEDETAILADETAILATYPICALSCALE2.
800www.
ti.
comEXAMPLEBOARDLAYOUT.
0028MAX[0.
07]ALLAROUND.
0028MIN[0.
07]ALLAROUND(.
213)[5.
4]6X(.
050)[1.
27]8X(.
061)[1.
55]8X(.
024)[0.
6](R.
002)TYP[0.
05]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:(continued)6.
PublicationIPC-7351mayhavealternatedesigns.
7.
Soldermasktolerancesbetweenandaroundsignalpadscanvarybasedonboardfabricationsite.
METALSOLDERMASKOPENINGNONSOLDERMASKDEFINEDSOLDERMASKDETAILSEXPOSEDMETALOPENINGSOLDERMASKMETALUNDERSOLDERMASKSOLDERMASKDEFINEDEXPOSEDMETALLANDPATTERNEXAMPLEEXPOSEDMETALSHOWNSCALE:8XSYMM1458SEEDETAILSSYMMwww.
ti.
comEXAMPLESTENCILDESIGN8X(.
061)[1.
55]8X(.
024)[0.
6]6X(.
050)[1.
27](.
213)[5.
4](R.
002)TYP[0.
05]SOIC-1.
75mmmaxheightD0008ASMALLOUTLINEINTEGRATEDCIRCUIT4214825/C02/2019NOTES:(continued)8.
Lasercuttingapertureswithtrapezoidalwallsandroundedcornersmayofferbetterpasterelease.
IPC-7525mayhavealternatedesignrecommendations.
9.
Boardassemblysitemayhavedifferentrecommendationsforstencildesign.
SOLDERPASTEEXAMPLEBASEDON.
005INCH[0.
125MM]THICKSTENCILSCALE:8XSYMMSYMM1458IMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(INCLUDINGDATASHEETS),DESIGNRESOURCES(INCLUDINGREFERENCEDESIGNS),APPLICATIONOROTHERDESIGNADVICE,WEBTOOLS,SAFETYINFORMATION,ANDOTHERRESOURCES"ASIS"ANDWITHALLFAULTS,ANDDISCLAIMSALLWARRANTIES,EXPRESSANDIMPLIED,INCLUDINGWITHOUTLIMITATIONANYIMPLIEDWARRANTIESOFMERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEORNON-INFRINGEMENTOFTHIRDPARTYINTELLECTUALPROPERTYRIGHTS.
TheseresourcesareintendedforskilleddevelopersdesigningwithTIproducts.
Youaresolelyresponsiblefor(1)selectingtheappropriateTIproductsforyourapplication,(2)designing,validatingandtestingyourapplication,and(3)ensuringyourapplicationmeetsapplicablestandards,andanyothersafety,security,orotherrequirements.
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TI'sprovisionoftheseresourcesdoesnotexpandorotherwisealterTI'sapplicablewarrantiesorwarrantydisclaimersforTIproducts.
MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated
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