LM2601MTCX资料

LM2601AdapterInterfaceCircuitApril2001

LM2601

AdapterInterfaceCircuit

GeneralDescription

TheAdapterInterfaceCircuit(AIC)isusedtosensethepresenceofanexternalpowersourceforaportablecom-puter.Itnotifiesthecomputerifasourceispresentandindicatesifthesourceisappropriateforchargingbatterypacksinsidethecomputer.TheAICalsosensesanadaptercurrentanditsdirection.AICisolatestheadapterandsignalsthecomputerwhenpeakcurrentthresholdisexceeded.LM2601drivesP-channelFETs.NohighcurrentratedSchottkydiodeisrequiredtoimplementanadapterswitcho-vercircuit.Thissignificantlydecreasesadditionalheatdissi-pationduringsimultaneousfastbatterychargingwhilerun-ningacomputer,particularlyinMaximumPerformancemodeofoperation

nLM2601shutsdownautomaticallywhenadapterisremoved

nLowleakagecurrentfrombatterywhennotpowerednDrivesP-channelFETs,noSchottkydiodesarerequirednNoreverseinrushcurrentfrombatteryintotheadapteroutputcapacitance

nAllowsforbatterycapacitygas-gaugecalibrationundersystemsoftware/firmwarecontrol

nAdapterovercurrentthresholdprogrammablewithexternalresistors

nWideinputrange:5V-24V

nAvailableinTSSOP-14package

Applications

nPortableComputers

nPortableIAs(InternetAppliances,InformationAppliances)

nOtherBatteryPoweredDevices

Features

nDetectsanAC-DCadaptersuitableforbatterychargingoranairplaneorcarpowerlineadapterthatshouldnotbeusedforbatterycharging

nAllowstheimplementationofintelligentswitchovercircuitsforportablesystems

BlockDiagram

10130901

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LM2601PinConfiguration

TSSOP-14

10130902

OrderingInformation

OrderNumberLM2601MTCLM2601MTCX

PackageNumber

MTC14MTC14

PackageTypeTSSOP-14TSSOP-14

SuppliedAs*

Rail(94Units/Rail)TapeandReel(2500Units/Reel)

*PartialRailsareavailable,thereisnominimumorderquantity.TapeandReelissuppliedasfullreelsonly.

PinDescription

PinNo.12

NameMPSDELAYMASTERPOWERSOURCE

Function

AcapacitorbetweenthispinandgroundsetsthedelayoftheMPSrisetime.SeeMPSDELAYdescriptioninTypicalApplicationsection.

Bi-directionallogicpin.Ifdrivenhighbyanexternalsource,indicatesthatabatteryispoweringthepowerbus.IfdrivenhighbytheAIC,indicatestheadapterispoweringthebus.AICcannotdriveMPSlow.Ifthereisnovalidadaptervoltagepresent,thepinisnotanoutputbutahighimpedancelogicinput.Theinputispulled-downviaaninternal40kresistor.

Logicinputpin.Activehigh.GrantspermissiontotheadaptertodriveboththepowerbusandtheMPSsignal.

Logicoutputpin.Highwhen12voltsLogicoutputpin.HighwhenVADAPTER>17volts.Theoutputtypicallyhas40kpull-downresistor.ThesourcecurrentisnotinternallylimitedandthepartcanbedamagediftheoutputisshortedtogroundwhendrivenHIGH.ICgroundpin.

DrivesthegateofthedisconnectP-chFET.DrivesthegateofthebackfeedP-chFET.

ConnectionforcurrentsenseresistortocontrolBACKFEED.ConnectionforcurrentsenseresistortocontrolDISCONNECT.Powerinputpin.OutputofACadapter,autoadapterorairlineadapter.

34

ADAPTERENABLEADAPTERPRESENTCHARGERPRESENTGND

DISCONNECTBACKFEEDDIRECTIONSENSEPEAKSENSEVADAPTER5

91011121314

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LM2601AbsoluteMaximumRatings

(Note1)StorageTemperature

ESDRatings

HumanBodyModel(Note2)MachineModel(Note3)

−40˚Cto125˚C

2kV200V

IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.VADAPTERVPEAKSENSE,VDIRECTIONSENSE,VBACKFEED,VDISCONNECTVADAPTERENABLE,

VMASTERPOWERSOURCEVMPSDELAY−0.3Vto28V−0.3VtoVADAPTER−0.3Vto5.5V−0.3Vto2V

OperatingRatings(Note1)

SupplyVoltage(VADAPTER)AmbientTemp.RangeJunctionTemp.Range

5Vto24V−20˚Cto70˚C−20˚Cto85˚C

ElectricalCharacteristics

LimitswithstandardtypefaceapplyforTJ=25˚C,andlimitsinboldfacetypeapplyoverthefulltemperaturerange(Note4)SymbolVAEVAP,CPVMPSIVMPSO

Parameter

AdapterEnable-3V-or5V-CMOSorTTLLogicInputLogicOutputVoltage

Adapterpresent,ChargerpresentMasterPowerSource5V-CMOSLogicInputLogicOutputVoltageMasterPowerSource

AdapterVoltageforVAPLow-to-HighTransitionHysteresis

VCHARGERAdapterVoltageforVCPLow-to-HighTransitionHysteresis

∆VBACKFEEDCurrentSenseDifferentialVoltageThresholdforDrivingBackfeedFET

Vadapter−Directionsense,VADAPTER=5VHighLow

High

Low,ISINK=5µAHighLow

VADAPTER>5.8VHighLow

Conditions

Min2.0

0.8

2.94.0

0.8

4.511.71.816.50.0843127125

4.750.0512.02.017.00.109135VADAPTER-0.5VVADAPTER-10VorGND+0.5V,whicheverisgreater

3215017000

61015

V

3.10.25

0.6

Typ

Max

UnitsVVV

V

0.512.3

V

2.217.4

V

0.121718143145

mVmV

VADAPTER∆VDISCONNECTCurrentSenseDifferentialVoltageVadapter−Peaksense,

ThresholdforDrivingDisconnectFETVADAPTER=24VVBACKFEED,VDISCONNECTFETControlVoltage

VADAPTER>11VHigh

VADAPTER>11VLow

tDRIVEIQIL,B,IL,DIL,AEIL,MPSTCDELAYRise/FallTimeofFETDrive(Note5)

QuiescentCurrent

LeakageCurrentintoBackfeedorDisconnect

InputCurrentintoAdapterEnableInput

InputCurrentintoMPSInputDelayTimeTemperatureCoefficient

VADAPTER=10VCLoad=3000pFVADAPTER=24V

VADAPTER=0V

VBACKFEED,VDISCONNECT=18VVAE=3.3V,

Backfeed/Disconnect=18VVMPS=5.5V

µSmAµAµAµAppm/˚C

Note1:AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.OperatingRatingsindicateconditionsforwhichthedeviceisintendedtobefunctional,butdonotguaranteespecificperformancelimits.Forguaranteedspecificationsandtestconditions,seetheElectricalCharacteristics.Note2:Thehumanbodymodelisa100pFcapacitordischargedthrougha1.5kΩresistorintoeachpin.

Note3:Themachinemodelisa200pFcapacitordischargeddirectlyintoeachpin.Allpinsareratedfor200Vexceptpins4and5whichareratedfor100V.Note4:Datasheetmin/maxspecificationlimitsareguaranteedbydesign,test,orstatisticalanalysis.

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LM2601ElectricalCharacteristics

(Continued)

Note5:AdapterEnableinputisusedtochangethestateofDisconnect,DirectionSenseinputisusedtochangethestateofBackfeed.

a.FalltimeismeasuredasthetimeittakesBackfeedorDisconnectvoltagetogofromahighlevel(approx.VADAPTER−0.5V)to(VADAPTER−4V)afterthesignalisinitiatedatAdapterEnableorDirectionSense.

b.RisetimeismeasuredasthetimeittakesBackfeedorDisconnectvoltagetogofromalowlevel(approx.0.5V)to(VADAPTER−2V)afterthesignalisinitiatedatAdapterEnableorDirectionSense.

TypicalApplication

10130903

Notes

1.RSENSEvalueshouldbeselectedtoguaranteethata

programmedovercurrentwillcauseavoltagedropacrossRSENSEofapprox.135mV.IfahighervalueofRSENSEhastobeselectedthenR1/R3resistordividershouldbeusedtoscalethevoltagedropdown.

2.InternalandexternalcircuitsassociatedwithDirection

SenseandBackfeedFETpinsallowtoemulateaSchot-tkydiodefunctionalitywithmuchlowerforwardvoltagedropand,therefore,withmuchlowerpowerdissipation.R2/R4resistordividerprogramsthebackfeedcurrentprotectionthreshold.ThebackfeedFETQ1turnsoffwhenthebackfeedcurrentpulselevelcausesmorethan9mV(typicalvalue)voltagedropbetweenVadapterpinandDirectionSensepin.

3.Voltagedifference(VDIRECTIONSENSE-VADAPTER)must

behigherthan20mVtoreliablyisolatetheadapterincaseofleakage.

4.R5andR6preventtheFETsfromturningonunless

drivenbyLM2601.

5.

CDELAYvaluecanbecalculatedfromthefollowingfor-mula:

CDELAY(nF)=TDELAY(µs)/90at25˚C

6.TDELAYtemperaturecoefficientequals4000ppm/˚C.See

alsotheTypicalDelayTimevs.Temperaturegraph.7.PinMasterPowerSource(MPS)shouldbeconnectedto

SystemManagementController’s(SMC)andbatterypacks’GPIOs.WhenSMCdetectsapoweredACadapterviaactivesignalsatChargerPresentorAdapterPresentoutputs,itassertsAdapterEnablesignalandisolatesthebatterypack(s).AdapterEnablesignalturnstheDisconnectFETon.WhentheACadapterisun-pluggedorpoweredoff,SMCenablesoneofthesystembatterypacks.Thebatterypacks’embeddedcontrollerstartsdrivingthelogicMPSsignalhighthatturnstheDisconnectFEToff.

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LM2601TypicalDelayTimevs.Temperature

10130905

ApplicationInformation

Theadapterinterfacecircuit(AIC)ICprovidesthecontrolfunctionsnecessaryforuseinmatingaconstantvoltageoutputAC-DCadapterorairlineadaptertoanotebookcom-putersystemoraportabledevice.Itallowsoptimalbatterychargingduringcomputeroperation,andallowsbatterydis-chargeforbatterygasgaugecalibration.Itreceivescontrolsignalsfromthenotebookcomputer,monitorsinputcurrentfromtheadapter,providesadaptervoltagestatustothenotebooksystemmanagementmicrocontroller(or″embed-dedcontroller″),andappropriatelydrivesMOSFETswitchestoelectricallyconnecttheadaptertothecomputer.

AICwillallowasystemdesignertosolvevariouspowermanagementtaskstypicalforanadapterpoweredsystemscontainingarechargeablebattery.

Whenanotebookcomputerisbeingpoweredfromabatteryandtheadapterispluggedin,thecomputershouldstartdrawingpowerfromtheadapter,notfromthebattery.Themosttimeefficientchargingscenarioiswhenacomputerdrawsthefullratedcurrentfromaconstantvoltageadapter.Thecomputeruseswhatitneedstorun,andpassesallremainingpowerontothebatteryforcharging.Thecom-putershouldbeabletoautomaticallyrefusetochargeabatterywhenpoweredfromanairplanepowerline.Itmaybe

necessarysometimestohaveacomputerfullydischargingthebatteryandthenfullyrechargingit(forbatterygasgaugecalibrationpurposes)whilebeingpoweredbyanACadapter.AICwillalsoallowacomputertopreventbackfeedingcur-rentintoanadapteriftheadapterisnotpoweredwhilebeingpluggedintothecomputer(someofexistingadapterscandrawcurrentfromthecomputerunderthisconditionsforchargingtheACadapteroutputbulkcapacitancefromthecomputerbattery).

Whilethelowestusableadaptervoltageisabout9.5V,thatisVADAPTER=11.7Vminus2.2Vhysteresis,AICisoperationaldowntoVADAPTER=5V.ThismeansthatAICwillnotgen-eratefalsereadingsdowntoVADAPTER=5V.SuchfalsereadingswouldbeMPS=HIGH,ADAPTERPRESENT=HIGH,CHARGERPRESENT=HIGH.

AICdeterminesusablevoltagerangesbycomparingVADAPTERwithaninternal2.5Vvoltagereference(seealsoElectricalCharacteristics).AICdetectsoperatingcurrentlimitandleakagecurrentlimitintotheadapterjackbydifferentialsensingacrosscurrentsenseresistorRSENSEeitherdirectlyorscaleddownbyresistordividersR1/R3andR2/R4.

WhendesigningtheLM2601intoasystemitmaybeneces-sarytoconsiderESDprotectionrequirementsfortheadapterjackaccordingtoyoursystemdesignspec.

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LM2601AdapterInterfaceCircuitPhysicalDimensions

unlessotherwisenoted

inches(millimeters)

TSSOP-14Package

14-LeadThinShrinkSmall-OutlinePackageForOrdering,RefertoOrderingInformationTable

NSPackageNumberMTC14

LIFESUPPORTPOLICY

NATIONAL’SPRODUCTSARENOTAUTHORIZEDFORUSEASCRITICALCOMPONENTSINLIFESUPPORTDEVICESORSYSTEMSWITHOUTTHEEXPRESSWRITTENAPPROVALOFTHEPRESIDENTANDGENERALCOUNSELOFNATIONALSEMICONDUCTORCORPORATION.Asusedherein:1.Lifesupportdevicesorsystemsaredevicesorsystemswhich,(a)areintendedforsurgicalimplantintothebody,or(b)supportorsustainlife,andwhosefailuretoperformwhenproperlyusedinaccordancewithinstructionsforuseprovidedinthelabeling,canbereasonablyexpectedtoresultinasignificantinjurytotheuser.

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2.Acriticalcomponentisanycomponentofalifesupportdeviceorsystemwhosefailuretoperformcanbereasonablyexpectedtocausethefailureofthelifesupportdeviceorsystem,ortoaffectitssafetyoreffectiveness.

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Nationaldoesnotassumeanyresponsibilityforuseofanycircuitrydescribed,nocircuitpatentlicensesareimpliedandNationalreservestherightatanytimewithoutnoticetochangesaidcircuitryandspecifications.