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LTC4053EDD-4.2#PBF中文资料

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LTC4053-4.2
USBCompatible
Lithium-IonBatteryCharger
withThermalRegulation
FEATURES
■■■■■■■■■■■■■■
DESCRIPTIO
U
APPLICATIOS
■■■■■
ChargesSingle-CellLi-IonBatteriesDirectlyfromUSBPort
ThermalRegulationMaximizesChargeRatewithoutRiskofOverheating*
ProgrammableChargeCurrentwith±7%AccuracyLowDropoutOperation
NoExternalMOSFET,SenseResistororBlockingDiodeRequired
ProgrammableChargeTerminationTimerPresetChargeVoltagewith±1%AccuracyC/10ChargeCurrentDetectionOutputACPresentLogicOutput
25µASupplyCurrentinShutdownModeAutomaticRecharge
ChargeCurrentMonitorUsefulforGasGaugingThermistorInputforTemperatureQualifiedChargingAvailablein10-pinthermallyenhancedMSOPandlowprofile(0.75mm3mm×3mmDFNpackages
TheLTC®4053isastandalonelinearchargerforlithium-ionbatteriesthatcanbepowereddirectlyfromaUSBport.TheICcontainsanon-chippowerMOSFETandeliminatestheneedforanexternalsenseresistorandblockingdiode.Thermalregulationautomaticallyadjustschargecurrenttolimitdietemperatureduringhighpowerorhighambienttemperatureconditions.ThisfeatureprotectstheendproductandtheLTC4053fromthermalstresswhiletheICchargesthebatteryatmaximumratewithoutinterruption.Thechargecurrentandchargetimecanbesetexternallywithasingleresistorandcapacitor,respectively.Whentheinputsupply(walladapterorUSBsupplyisremoved,theLTC4053automaticallyentersalowcurrentsleepmode,droppingthebatterydraincurrenttolessthan5µA.TheLTC4053alsoincludesNTCtemperaturesensing,C/10detectioncircuitry,ACpresentlogic,lowbatterychargeconditioning(tricklechargingandshutdown(25µAsupplycurrent.
TheLTC4053isavailablein10-pinthermallyenhancedMSOPandlowprofile(0.75mmDFNpackages.
,LTCandLTareregisteredtrademarksofLinearTechnologyCorporation.ProtectedbyU.S.Patentsincluding6522118,6700364.
CellularTelephonesHandheldComputers
ChargingDocksandCradlesMP3PlayersDigitalCameras
TYPICALAPPLICATIO
USBPORT4.35VTO5.5V
2VCC
BAT
ChargeCurrentvsInputVoltage
600500400IBAT(mA
USBPoweredStandaloneLi-IonCharger
9
SYSTEMLOADLi-IonBATTERY
VBAT=3.95V
+
LTC4053-4.24
4.7µF
TIMER
8
300200
VBAT=4.15V
1000
SHDN
SUSPEND
3.74k
USBCONTROL
µC
100mA/500mA
GNDNTCPROG567
15k
0.1µF
4.0
4053TA01
U
TA=25°C
RPROG=3k
VBAT=4.05V4.5
VCC(V
4053G04
U
5.05.5
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LTC4053-4.2
ABSOLUTEAXIURATIGS
InputSupplyVoltage(VCC.......................................7VBAT...........................................................................7VNTC,SHDN,TIMER,PROG............–0.3VtoVCC+0.3VCHRG,FAULT,ACPR..................................–0.3Vto7VBATShort-CircuitDuration..........................ContinuousBATCurrent(Note2.............................................1.3APROGCurrent(Note2.......................................1.3mA
WU
PACKAGE/ORDERIFORATIO
TOPVIEW
CHRGVCCFAULTTIMERGND
12345
11
10ACPR9BAT8SHDN7PROG6NTC
U
ORDERPARTNUMBERLTC4053EDD-4.2DDPARTMARKING
LBQC
DDPACKAGE
10-LEAD(3mm×3mmPLASTICDFNTJMAX=125°C,θJA=40°C/W(NOTE4EXPOSEDPAD(PIN11ISGND(MUSTBESOLDEREDTOPCB
OrderOptionsTapeandReel:Add#TR
LeadFree:Add#PBFLeadFreeTapeandReel:Add#TRPBFLeadFreePartMarking:http://www.linear.com/leadfree/
ConsultLTCMarketingforpartsspecifiedwithwideroperatingtemperatureranges.
The●denotesthespecificationswhichapplyoverthefulloperating
temperaturerange,otherwisespecificationsareatTA=25°C.VCC=5V
SYMBOLVCCICC
PARAMETERVCCSupplyVoltageVCCSupplyCurrent
ChargerOn;CurrentMode;RPROG=30k(Note5ShutdownMode;VSHDN=0V
SleepModeVCCBATorVCC≤4VRPROG=3k;CurrentModeRPROG=15k;CurrentModeShutdownMode;VSHDN=0V
SleepModeVCCBATorVCC<(VUV–∆VUVVBAT<2V;RPROG=3kVBATRisingVCCRisingSHDNPinVoltage
●
ELECTRICALCHARACTERISTICS
CONDITIONS
●●●●●●●
VBATIBAT
VBATRegulatedFloatVoltageBatteryPinCurrent
ITRIKLVTRIKL∆VTRIKLVUV∆VUVVMSDVASD
TrickleChargeCurrentTrickleChargeTripThresholdTrickleChargeTripHysteresisVCCUndervoltageLockoutVoltageVCCUndervoltageLockoutHysteresisManualShutdownThresholdVoltage
AutomaticShutdownThresholdVoltage(VCC-VBATHightoLow
(VCC-VBATLowtoHigh
2
UWWW
(Note1
JunctionTemperature..........................................125°COperatingTemperatureRange(Note3...–40°Cto85°CStorageTemperatureRange
MSE..................................................–65°Cto150°CDD....................................................–65°Cto125°CLeadTemperature(Soldering,10sec
MSE..................................................................300°C
TOPVIEW
CHRGVCCFAULTTIMERGND
12345
109876
ACPRBATSHDNPROGNTC
ORDERPARTNUMBERLTC4053EMSE-4.2MSEPARTMARKING
LTZT
11
MSEEXPOSEDPADPACKAGE10-LEADPLASTICMSOPTJMAX=125°C,θJA=40°C/W(NOTE4EXPOSEDPAD(PIN11ISGND(MUSTBESOLDEREDTOPCB
MIN4.25
TYP12525
MAX6.5250504.242535107±3±365
UNITS
VmAµAµAVmAmAµAµAmAVmV
4.15846593
4.2500100±1±1502.481004200
●35
4.251.3
VmVVmVmV
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LTC4053-4.2
The●denotesthespecificationswhichapplyoverthefulloperating
temperaturerange,otherwisespecificationsareatTA=25°C.VCC=5V
SYMBOLVPROGICHRGVCHRGVACPRVFAULTIC/10tTIMERVRECHRGVNTC-HOTVHOT-HYSVNTC-COLDVCOLD-HYSVNTC-DISVDIS-HYSTLIMRON
PARAMETERPROGPinVoltage
CHRGPinWeakPulldownCurrentCHRGPinOutputLowVoltageACPRPinOutputLowVoltageFAULTPinOutputLowVoltageEndofChargeIndicationCurrentLevelTIMERAccuracy
RechargeBatteryVoltageThresholdNTCPinHotThresholdVoltageNTCPinHotHysteresisVoltageNTCPinColdThresholdVoltageNTCPinColdHystersisVoltageNTCPinDisableThresholdVoltageNTCPinDisableHystersisVoltageJunctionTemperatureinConstant-TemperatureModePowerMOSFET“ON”Resistance
VNTCRisingVNTCRisingCONDITIONS
RPROG=3k,IPROG=500µAVCHRG=1VICHRG=5mAIACPR=5mAIFAULT=5mARPROG=3kCTIMER=0.1µFBatteryVoltageFallingVNTCFalling
4415MIN
TYP1.5300.350.350.3550104.0352.5804.3758010010105375
500.60.60.656MAX
UNITS
VµAVVVmA%VVmVVmVmVmV°CmΩ
ELECTRICALCHARACTERISTICS
Note1:AbsoluteMaximumRatingsarethosevaluesbeyondwhichthelifeofadevicemaybeimpaired.
Note2:TheAbsoluteMaximumBATCurrentRatingof1.3Aisguaranteedbydesignandcurrentdensitycalculations.TheAbsoluteMaximumPROGCurrentRatingisguaranteedtobe1/1000ofBATcurrentratingbydesign.Note3:TheLTC4053Eisguaranteedtomeetperformancespecificationsfrom0°Cto70°C.Specificationsoverthe–40°Cto85°Coperatingtemperaturerangeareassuredbydesign,characterizationandcorrelationwithstatisticalprocesscontrols.
Note4:FailuretosoldertheexposedbacksideofthepackagetothePCboardwillresultinathermalresistancemuchhigherthan40°C/W.
Note5:SupplycurrentincludesPROGpincurrent(approximately50µAbutdoesnotincludeanycurrentdeliveredtothebatterythroughtheBATpin(approximately50mA.
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LTC4053-4.2
TYPICALPERFORACECHARACTERISTICS
BatteryRegulationVoltagevsBatteryChargeCurrent
4.224.214.20
VCC=5VTA=25°CRPROG=3k
VBAT(V
VBAT(V
4.194.184.174.16
VBAT(V
0
50100150200250300350400450500
IBAT(mA
4053G01
ChargeCurrentvsInputVoltage
600500400
VBAT=3.95V
TA=25°CRPROG=3k
IBAT(mA
IBAT(mA
300200
VBAT=4.15V
1000
3002502001501005000
0.5
1
1.5
22.5VBAT(V
3
3.5
IBAT(mA
VBAT=4.05V
4.04.5
VCC(V
5.0
UndervoltageLockoutVoltagevsTemperature
4.054.044.034.02
ICC(µA
VUV(V
4.003.993.983.973.963.95
–50–25
5025075
TEMPERATURE(°C
100
125
151050
–50–25
VCC=4.5V
VMSD(V
4.01
4
UW
4053G04
BatteryRegulationVoltagevsTemperature
4.244.224.204.184.164.144.124.104.08
VCC=5VRPROG=3kIBAT=10mA
–25
0255075TEMPERATURE(°C
100
125
4.2104.2084.2064.2044.2024.2004.1984.1964.1944.1924.190
BatteryRegulationVoltagevsVCC
VCC=5VRPROG=3kIBAT=10mA
4.06
–50
44.55
5.5VCC(V
66.57
4053G03
4053G02
ChargeCurrentvsBatteryVoltage
550500450400350
VCC=5VTA=25°CRPROG=3k
ChargeCurrentvsAmbientTemperaturewithThermalRegulation
1000900800700600500400300200100
VCC=5VVBAT=3.5VRPROG=1.5k
–25
25500
TEMPERATURE(°C
75
100
4053G06
THERMALCONTROLLOOPINOPERATION
5.544.5
0–50
4053G05
ShutdownSupplyCurrentvsTemperature
302520
VSHDN=0V
1.30
ManualShutdownThresholdVoltagevsTemperature
1.251.20
VCC=6.5VVCC=5.5V
1.151.101.051.000.950.900.85
VCC=5V
VCC=6V
VCC=5.5V
VCC=4.5V
5025750
TEMPERATURE(°C
100125
0.80
–50–25
5025075
TEMPERATURE(°C
100125
4053G074053G084053G09
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LTC4053-4.2
TYPICALPERFORACECHARACTERISTICS
PROGPinVoltagevsChargeCurrent
1.61.41.2
VCC=5VTA=25°CRPROG=3k
VPROG(V
VPROG(V
VPROG(V
1.00.80.60.40.200
50100150200250300350400450500
CHARGECURRENT(mA
4052G10
TrickleChargeCurrentvsTemperature
12IBAT(%OFPROGRAMMEDCURRENT
11
VBAT=2VTA=25°CRPROG=3k
ICHRG(µA
302928
VCHRG(V
10
9
8
7
–50–25
5025075
TEMPERATURE(°C
TimerErrorvsTemperature
5432
VCC=5V
CTIMER=0.1µF
tTIMER(%
0–1–2–3–4
–5
–50–25
5025075
TEMPERATURE(°C
100
125
tTIMER(%
1
UW
100
4053G13
PROGPinVoltagevsVCCConstantCurrentMode
1.5151.5101.5051.5001.4951.4901.485
VBAT=3.5VTA=25°CRPROG=3k
1.5151.5101.5051.5001.4951.490
PROGPinVoltagevsTemperatureConstantCurrentMode
VCC=5VVBAT=4VRPROG=3k
44.55
5.5VCC(V
66.57
4053G11
1.485
–50
–25
02550TEMPERATURE(°C
75100
4053G12
CHRGPinWeakPull-DownCurrentvsTemperature
35
VCC=5V34IBAT333231
CHRGPinOutputLowVoltagevsTemperature
0.60.50.40.30.20.10
–50–25
VCC=5VICHRG=5mA
2726
125
25
–50–25
5025075
TEMPERATURE(°C
100
125
5025750
TEMPERATURE(°C
100125
LTC1323•TPC05
4053G15
TimerErrorvsVCC
543210–1–2–3–4–5
4
4.5
5
5.5VCC(V
6
6.5
7
4056G17
TA=25°C
CTIMER=0.1µF
LTC1323•TPC05
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LTC4053-4.2
PIFUCTIOS
CHRG:Open-DrainChargeStatusOutput.Whenthebatteryisbeingcharged,theCHRGpinispulledlowbyaninternalN-channelMOSFET.Whenthechargecurrentdropsto10%ofthefull-scalecurrent,theN-channelMOSFETlatchesoffanda30µAcurrentsourceiscon-nectedfromtheCHRGpintoground.TheC/10latchcanbeclearedbygroundingtheSHDNpin,momentarily,ortogglingVCC.Whenthetimerrunsoutortheinputsupplyisremoved,thecurrentsourceisdisconnectedandtheCHRGpinisforcedhighimpedance.
VCC:PositiveInputSupplyVoltage.WhenVCCiswithin35mVofVBATorlessthantheundervoltagelockoutthreshold,theLTC4053enterssleepmode,droppingIBATtolessthan3µA.VCCcanrangefrom4.25Vto6.5V.Bypassthispinwithatleasta4.7µFceramiccapacitortoground.
FAULT:Open-DrainFaultStatusOutput.TheFAULTopen-drainlogicsignalindicatesthatthechargerhastimedoutundertricklechargeconditionsortheNTCcomparatorisindicatinganout-of-rangebatterytemperaturecondition.IfVBATislessthat2.48V,tricklechargingbeginswherebythechargecurrentdropstoonetenthofitsprogrammedvalueandthetimerperiodisreducedbyafactoroffour.Whenonefourthofthetimingperiodhaselapsed,ifVBATisstilllessthan2.48V,tricklechargingstopsandtheFAULTpinlatchestoground.ThefaultcanbeclearedbytogglingVCC,momentarilygroundingtheSHDNpinorpullingtheBATpinabove2.48V.IftheNTCcomparatorisindicatinganout-of-rangebatterytemperaturecondition,theFAULTpinwillpulltogrounduntilthetemperaturereturnstotheacceptablerange.
TIMER:TimerCapacitor.Thetimerperiodissetbyplacingacapacitor,CTIMER,toground.Thetimerperiodis:Time(Hours=(CTIMER•3hr/(0.1µF
ShorttheTIMERpintogroundtodisabletheinternaltimerfunction.
GND:Ground.TheexposedbacksideofthepackageisalsogroundandmustbesolderedtothePCboardformaxi-mumheattransfer.
NTC:InputtotheNTC(NegativeTemperatureCoefficientThermistorTemperatureMonitoringCircuit.Withanex-ternal10kΩNTCthermistortogroundanda1%resistortoVCC,thispincansensethetemperatureofthebatterypackandstopchargingwhenitisoutofrange.Whenthevoltageatthispindropsbelow(0.5•(VCCathottempera-turesorrisesabove(0.875•(VCCatcold,chargingissuspendedandtheinternaltimerisfrozen.TheCHRGpinoutputstatusisnotaffectedinthisholdstate.TheFAULTpinwillbepulledtoground,butnotlatched.Whenthetemperaturereturnstoanacceptablerange,chargingwillresumeandtheFAULTpinwillbereleased.TheNTCfeaturecanbedisabledbygroundingtheNTCpin.PROG:ChargeCurrentProgramandChargeCurrentMoni-torPin.Thechargecurrentisprogrammedbyconnectingaresistor,RPROGtoground.Wheninconstant-currentmode,theLTC4053servosthePROGpinvoltageto1.5V.InallmodesthevoltageonthePROGpincanbeusedtomeasurethechargecurrentasfollows:IBAT=(VPROG/RPROG•1000.
SHDN:ShutdownInputPin.PullingtheSHDNpintogroundwillputtheLTC4053intostandbymodewheretheBATdraincurrentisreducedtolessthan3µA,andthesupplycurrentisreducedtolessthan25µA.Fornormaloperation,pulltheSHDNpinuptoVCC.
BAT:ChargeCurrentOutput.Abypasscapacitorofatleast1µFwitha1Ωseriesresistorisrequiredtokeeptheloopstablewhenthebatteryisnotpresent.Aprecisioninternalresistordividersetsthefinalfloatpotentialonthispin.Theinternalresistordividerisdisconnectedinsleepandshutdownmode.
ACPR:Open-DrainPowerSupplyStatusOutput.WhenVCCisgreaterthantheundervoltagelockoutthresholdandatleast35mVaboveVBAT,theACPRpinwillpulltoground.Otherwise,thepinishighimpedance.
6
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LTC4053-4.2
SIPLIFIEDBLOCKDIAGRA
VCC
–
105°C
TA
TDIE
NTC6
NTC
MP
VA
–
CA
CHRG1
HOTCOLDDISABLESTOPC/10
30µA
SHDN
R3
1.5V
LOGIC
+
–
ACPR10
ACPR
0.15V
C/10
FAULT
CHARGE
C2
FAULT3
COUNTER
C3
OSCILLATOR
2.485V
4TIMERCTIMER
TOBAT
7PROGRPROG
5GND
4053BD
W
++
W
2
D1D2D3
–+
M2×1M1×1000
–
MA
+
30µA
R1
9
BAT
R2
–
2.485V
+
REF
8SHDN
R4
R5
Figure1
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LTC4053-4.2
U
OPERATIO
TheLTC4053isalinearbatterychargerdesignedprimarilyforchargingsinglecelllithium-ionbatteries.FeaturinganinternalP-channelpowerMOSFET,thechargerusesaconstant-current/constant-voltagechargealgorithmwithprogrammablecurrentandaprogrammabletimerforchargetermination.Chargecurrentcanbeprogrammedupto1.25Awithafinalfloatvoltageaccuracyof±1%.Noblockingdiodeorsenseresistorisrequiredthusdroppingtheexternalcomponentcounttothreeforthebasicchargercircuit.TheCHRG,ACPR,andFAULTopen-drainstatusoutputsprovideinformationregardingthestatusoftheLTC4053atalltimes.AnNTCthermistorinputpro-videstheoptionofchargequalificationusingbatterytemperature.
Aninternalthermallimitreducestheprogrammedchargecurrentifthedietemperatureattemptstoriseaboveapresetvalueofapproximately105°C.ThisfeatureprotectstheLTC4053fromexcessivetemperature,andallowstheusertopushthelimitsofthepowerhandlingcapabilityofagivencircuitboardwithoutriskofdamagingtheLTC4053ortheexternalcomponents.AnotherbenefitoftheLTC4053thermallimitisthatchargecurrentcanbesetaccordingtotypical,notworst-case,ambienttemperaturesforagivenapplicationwiththeassurancethatthechargerwillauto-maticallyreducethecurrentinworst-caseconditions.ThechargecyclebeginswhenthevoltageattheVCCpinrisesabovetheUVLOlevel,aprogramresistoriscon-nectedfromthePROGpintoground,andtheSHDNpinispulledabovetheshutdownthreshold.Atthebeginningofthechargecycle,ifthebatteryvoltageisbelow2.48V,thechargergoesintotricklechargemodetobringthecell
voltageuptoasafelevelforcharging.Thechargergoesintothefastchargeconstant-currentmodeoncethevoltageontheBATpinrisesabove2.48V.Inconstant-currentmode,thechargecurrentissetbyRPROG.Whenthebatteryapproachesthefinalfloatvoltage,thechargecurrentbeginstodecreaseastheLTC4053enterstheconstant-voltagemode.Whenthecurrentdropsto10%ofthefull-scalechargecurrent,aninternalcompara-torlatchesofftheMOSFETontheCHRGpinandconnectsaweakcurrentsourcetoground(30µAtoindicateanearend-of-charge(C/10condition.TheC/10latchcanbeclearedbygroundingtheSHDNpinmomentarily,ormomentarilyremovingandreapplyingVCC.
AnexternalcapacitorontheTIMERpinsetsthetotalchargetime.Whenthistimeelapses,thechargecycleterminatesandtheCHRGpinassumesahighimpedancestate.Torestartthechargecycle,removetheinputvoltageandreapplyit,ormomentarilyforcetheSHDNpinto0V.ThechargecyclewillalsorestartiftheBATpinvoltagefallsbelowtherechargethreshold.
Forlithium-ionandsimilarbatteriesthatrequireanaccu-ratefinalfloatvoltage,theinternalreference,voltageamplifierandtheresistordividerprovideregulationwith±1%(maxaccuracy.
Whentheinputvoltageisnotpresent,thechargergoesintoasleepmode,droppingbatterydraincurrent,IBAT,tolessthan5µA.Thisgreatlyreducesthecurrentdrainonthebatteryandincreasesthestandbytime.Thechargercanbeshutdown(ICC=25µAbyforcingtheSHDNpinto0V.
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LTC4053-4.2
APPLICATIOSIFORATIO
UndervoltageLockout(UVLO
AninternalundervoltagelockoutcircuitmonitorstheinputvoltageandkeepsthechargerinshutdownmodeuntilVCCrisesabovetheundervoltagelockoutthreshold.TheUVLOcircuithasabuilt-inhysteresisof150mV.Furthermore,toprotectagainstreversecurrentinthepowerMOSFET,theUVLOcircuitkeepsthechargerinshutdownmodeifVCCfallstowithin35mVofthebatteryvoltage.IftheUVLOcomparatoristripped,thechargerwillnotcomeoutofshutdownuntilVCCrises70mVabovethebatteryvoltage.TrickleChargeAndDefectiveBatteryDetectionAtthebeginningofachargecycle,ifthebatteryvoltageislow(below2.48Vthechargergoesintotricklechargereducingthechargecurrentto10%ofthefull-scalecurrent.Ifthelowbatteryvoltagepersistsforonequarterofthetotalchargetime,thebatteryisassumedtobedefective,thechargecycleisterminated,theCHRGpinoutputassumesahighimpedancestate,andtheFAULTpinpullslow.ThefaultcanbeclearedbytogglingVCC,temporarilyforcingtheSHDNpinto0V,ortemporarilyforcingtheBATpinvoltageabove2.48V.Shutdown
TheLTC4053canbeshutdown(ICC=25µAbypullingtheSHDNpinto0V.Fornormaloperation,pulltheSHDNpinabovethemanualshutdownthresholdvoltagelevel.Donotleavethispinopen.Inshutdowntheinternallinearregulatoristurnedoff,andtheinternaltimerisreset.ProgrammingChargeCurrent
Theformulaforthebatterychargecurrent(seeFigure1is:
ICHG=(IPROG•1000
=(1.5V/RPROG•1000orRPROG=1500V/ICHG
whereRPROGisthetotalresistancefromthePROGpintoground.Undertricklechargeconditions,thiscurrentisreducedto10%ofthefull-scalevalue.
U
Forexample,if500mAchargecurrentisrequired,calculate:
RPROG=1500V/0.5A=3kΩ
Forbeststabilityovertemperatureandtime,1%metal-filmresistorsarerecommended.
Ifthechargerisinconstant-temperatureorconstant-voltagemode,thebatterycurrentcanbemonitoredbymeasuringthePROGpinvoltageasfollows:ICHG=(VPROG/RPROG•1000USBandWallAdapterPower
AlthoughtheLTC4053allowschargingfromaUSBport,awalladaptercanalsobeusedtochargeLi-Ionbatteries.Figure2showsanexampleofhowtocombinewalladapterandUSBpowerinputs.AP-channelMOSFET,MP1,isusedtopreventbackconductingintotheUSBportwhenawalladapterispresentandSchottkydiode,D1,isusedtopreventUSBpowerlossthroughthe1kpull-downresistor.
Typicallyawalladaptercansupplysignificantlymorecurrentthanthe500mA-limitedUSBport.Therefore,anN-channelMOSFET,MN1andanextra3kprogramresistorcanbeusedtoincreasethechargecurrentto1Awhenthewalladapterispresent.
5VWALLADAPTER1AICHGUSBPOWER500mAICHG
LTC4053
D12
MP1
VCC
PROG
7BAT
9ICHG
SYSTEMLOAD
WUU
+
Li-IonBATTERY
3k
1k
MN1
3k
4053F02
Figure2.CombiningWallAdapterandUSBPower
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LTC4053-4.2
APPLICATIOSIFORATIO
ProgrammingTheTimer
Theprogrammabletimerisusedtoterminatethechargecycle.ThetimerdurationisprogrammedbyanexternalcapacitorattheTIMERpin.Thetotalchargetimeis:Time(Hours=(3Hours•(CTIMER/0.1µForCTIMER=0.1µF•Time(Hours/3(Hours
ThetimerstartswhenaninputvoltagegreaterthantheundervoltagelockoutthresholdlevelisappliedandtheSHDNpinisgreaterthanthemanualshutdownthresholdvoltagelevel.Afteratime-outoccurs,thechargecurrentstops,andtheCHRGoutputassumesahighimpedancestatetoindicatethatthecharginghasstopped.Connect-ingtheTIMERpintogrounddisablesthetimerfunction.Recharge
Afterachargecyclehasterminated,ifthebatteryvoltagedropsbelowtherechargethresholdof4.05Vanewchargecyclewillbegin.TherechargecircuitintegratestheBATpinvoltageforafewmillisecondstopreventatransientfromrestartingthechargecycle.
Ifthebatteryvoltageremainsbelow2.48Vduringtricklechargefor1/4oftheprogrammedtime,thebatterymaybedefectiveandthechargecyclewillend.Inaddition,therechargecomparatorisdisabledandanewchargecyclewillnotbeginunlesstheinputvoltageistoggledoff-then-on,theSHDNpinismomentarilypulledtoground,ortheBATpinispulledabovethe2.48Vtricklechargethreshold.Open-DrainStatusOutputs
TheLTC4053hasthreeopen-drainstatusoutputs:ACPR,CHRGandFAULT.TheACPRpinpullslowwhenaninputvoltagegreaterthantheundervoltagelockoutthresholdisappliedandbecomeshighimpedancewhenpower(VIN<VUVisremoved.CHRGandFAULTworktogethertoindicatethestatusofthechargecycle.Table1describesthestatusofthechargecyclebasedontheCHRGandFAULToutputs.
High
30µApull-down30µApull-downHighHigh
10
U
Table1.
FAULTHighLow
CHRGLowLow
Description
Chargecyclehasstarted,C/10hasnotbeenreachedandchargingisproceedingnormally.Chargecyclehasstarted,C/10hasnotbeenreached,butthechargecurrentandtimerhavebeenpausedduetoanNTCout-of-temperaturecondition.
C/10hasbeenreachedandchargingisproceedingnormally.
C/10hasbeenreachedbutthechargecurrentandtimerhavepausedduetoanNTCout-of-temperaturecondition.
Normaltimeout(charginghasterminated.IfFAULTgoeslowandCHRGgoeshigh
impedancesimultaneously,thentheLTC4053hastimedoutduetoabadcell(VBAT<2.48Vafterone-quartertheprogrammedchargetime.IfCHRGgoeshighimpedancefirst,then
theLTC4053hastimedoutnormally(charginghasterminated,butNTCisindicatinganout-of-temperaturecondition.
LowHighLow
WUU
CHRGStatusOutputPin
Whenthechargecyclestarts,theCHRGpinispulledtogroundbyaninternalN-channelMOSFETcapableofdrivinganLED.Whenthechargecurrentdropsto10%ofthefull-scalecurrent(C/10,theN-channelMOSFETislatchedoffandaweak30µAcurrentsourcetogroundisconnectedtotheCHRGpin.Afteratime-outoccurs,thepinassumesahighimpedancestate.Byusingtwodifferentvaluepull-upresistorsamicroprocessorcandetectthreestatesfromthispin(charging,C/10andtime-out.SeeFigure3.
WhentheLTC4053isinchargemode,theCHRGpinispulledlowbytheinternalN-channelMOSFET.Todetectthismode,forcethedigitaloutputpin,OUT,highandmeasurethevoltageattheCHRGpin.TheN-channelMOSFETwillpullthepinlowevenwiththe2kpull-upresistor.Oncethechargecurrentdropsto10%ofthe
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LTC4053-4.2
APPLICATIOSIFORATIO
V+8VCCLTC4053
CHRG
3
400k
2k
VDD
µPROCESSOROUTIN
4053F03
Figure3.MicroprocessorInterface
full-scalecurrent(C/10,theN-channelMOSFETisturnedoffanda30µAcurrentsourceisconnectedtotheCHRGpin.TheINpinwillthenbepulledhighbythe2kpull-up.ByforcingtheOUTpintoahighimpedancestate,thecurrentsourcewillpullthepinlowthroughthe400kresistor.Whentheinternaltimerhasexpired,theCHRGpinwillassumeahighimpedancestateandthe400kresistorwillthenpullthepinhightoindicatethatcharginghasterminated.NTCThermistor
Thebatterytemperatureismeasuredbyplacinganegativetemperaturecoefficient(NTCthermistorclosetothebatterypack.TheNTCcircuitryisshowninFigure4.Tousethisfeature,connecta10kNTCthermistorbetweentheNTCpinandgroundandaresistor(RHOTfromtheNTCpintoVCC.RHOTshouldbea1%resistorwithavalueequaltothevalueofthechosenNTCthermistorat50°C(thisvalueis4.1kforaVishayNTHS0603N02N1002Jthermistor.TheLTC4053goesintoholdmodewhentheresistanceoftheNTCthermistordropsbelow4.1kwhichshouldbeapproximately50°C.Theholdmodefreezesthetimerandstopsthechargecycleuntilthethermistorindicatesareturntoavalidtemperature.Asthetemperaturedrops,theresistanceoftheNTCthermistorrises.TheLTC4053isdesignedtogointoholdmodewhenthevalueoftheNTCthermistorincreasestoseventimesthevalueofRHOT.ForaVishayNTHS0603N02N1002Jthermistor,thisvalueis28.7kwhichcorrespondstoapproximately0°C.Thehotandcoldcomparatorseachhaveapproximately2°Cofhysteresistopreventoscillationaboutthetrippoint.TheNTCfunctioncanbedisabledbygroundingtheNTCpin.
U
VCC
7/8VCC
RHOT1%
WUU
–
TOOCOLD
+
NTC
RNTC10k
1/2VCC
+
TOOHOT
–+
DISABLENTC
3/160VCC
–
LTC4053
4053F04
Figure4
Thermistors
TheLTC4053NTCtrippointsweredesignedtoworkwiththermistorswhoseresistance-temperaturecharacteris-ticsfollowVishayDale’s“R-TCurve2”.TheVishayNTHS0603N02N1002Jisanexampleofsuchather-mistor.However,VishayDalehasmanythermistorprod-uctsthatfollowthe“R-TCurve2”characteristicinavarietyofsizes.Futhermore,anythermistorwhoseratioofRCOLDtoRHOTisabout7.0willalsowork(VishayDaleR-TCurve2showsaratioofRCOLDtoRHOTof2.816/0.4086=6.9.NTCLayoutConsiderations
ItisimportantthattheNTCthermistornotbeinclosethermalcontactwiththeLTC4053.BecausetheLTC4053packagecanreachtemperaturesinexcessofthe50°Ctrippoint,theNTCfunctioncancauseahystereticoscillationwhichturnsthechargecurrentonandoffaccordingtothepackagetemperatureratherthanthebatterytemperature.ThisproblemcanbeeliminatedbythermallycouplingtheNTCthermistortothebatteryandnottotheLTC4053.Furthermore,itisessentialthattheVCCconnectiontoRHOTismadeaccordingtostandardKelvinsensetech-niques.SinceVCCisahighcurrentpathintotheLTC4053,itisessentialtominimizevoltagedropsbetweentheVCCinputpinandthetopofRHOT.
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LTC4053-4.2
APPLICATIOSIFORATIO
NTCTripPointErrors
Whena1%resistorisusedforRHOT,themajorerrorinthe50°CtrippointisdeterminedbythetoleranceoftheNTCthermistor.Atypical10kNTCthermistorhasa±10%tolerance.Bylookingupthetemperaturecoefficientofthethermistorat50°C,thetoleranceerrorcanbecalculatedindegreescentigrade.ConsidertheVishayNTHS0603N02N1002Jthermistorwhichhasatemperaturecoefficientof–3.3%/°Cat50°C.Dividingthetolerancebythetemperaturecoefficient,±10%/(3.3%/°C=±3°C,givesthetemperatureerrorofthehottrippoint.
ThecoldtrippointisalittlemorecomplicatedbecauseitserrordependsonthetoleranceoftheNTCthermistorandthedegreetowhichtheratioofitsvalueat0°Canditsvalueat50°Cvariesfrom7to1.Therefore,thecoldtrippointerrorcanbecalculatedusingthetolerance,TOL,thetemperaturecoefficientofthethermistorat0°C,TC(in%/°C,thevalueofthethermistorat0°C,RCOLD,andthevalueofthethermistorat50°C,RHOT.Theformulais:
⎛1+TOLRCOLD⎞
•–1⎟•100⎜
RHOT⎠TemperatureError(°C=⎝7
TCForexample,theVishayNTHS0603N02N1002Jthermistorwithatoleranceof±10%,TCof–4.5%/°C,andRCOLD/RHOTof6.89,hasacoldtrippointerrorof:
⎞⎛1±0.10
•.–6891⎟•100⎜
⎠TemperatureError(°C=⎝7
–4.5
=–1.8°C,+2.5°C
Ifathermistorwithatolerancelessthan±10%isused,thetrippointerrorsbegintodependonerrorsotherthanthermistortoleranceincludingtheinputoffsetvoltageoftheinternalcomparatorsoftheLTC4053andtheeffectsofinternalvoltagedropsduetohighchargingcurrents.
12
U
Constant-Current/Constant-Voltage/Constant-Temperature
TheLTC4053usesauniquearchitecturetochargeabatteryinaconstant-current,constant-voltage,constant-temperaturefashion.Figure1showsasimplifiedblockdiagramoftheLTC4053.Threeoftheamplifierfeedbackloopsshowncontroltheconstant-current,CA,constant-voltage,VA,andconstant-temperature,TAmodes.Afourthamplifierfeedbackloop,MA,isusedtoincreasetheoutputimpedanceofthecurrentsourcepair,M1andM2(notethatM1istheinternalP-channelpowerMOSFET.ItensuresthatthedraincurrentofM1isexactly1000timesgreaterthanthedraincurrentofM2.
AmplifiersCA,TA,andVAareusedinthreeseparatefeedbackloopstoforcethechargerintoconstant-current,temperature,orvoltagemode,respectively.Diodes,D1,D2,andD3provideprioritytowhicheverloopistryingtoreducethechargecurrentthemost.Theoutputsoftheothertwoamplifierssaturatelowwhicheffectivelyre-movestheirloopsfromthesystem.Wheninconstant-currentmode,CAservosthevoltageatthePROGpintobeprecisely1.50V(or0.15Vwhenintrickle-chargemode.TAlimitsthedietemperaturetoapproximately105°Cwheninconstant-temperaturemodeandthePROGpinvoltagegivesanindicationofthechargecurrentasdis-cussedin“ProgrammingChargeCurrent”.VAservositsinvertinginputtoprecisely2.485Vwheninconstant-voltagemodeandtheinternalresistordividermadeupofR1andR2ensuresthatthebatteryvoltageismaintainedat4.2V.Again,thePROGpinvoltagegivesanindicationofthechargecurrent.
Intypicaloperation,thechargecyclebeginsinconstant-currentmodewiththecurrentdeliveredtothebatteryequalto1500V/RPROG.IfthepowerdissipationoftheLTC4053resultsinthejunctiontemperatureapproaching105°C,theamplifier(TAwillbegindecreasingthechargecurrenttolimitthedietemperaturetoapproximately105°C.Asthebatteryvoltagerises,theLTC4053eitherreturnstoconstant-currentmodeoritentersconstant-voltagemodestraightfromconstant-temperaturemode.
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LTC4053-4.2
APPLICATIOSIFORATIO
Regardlessofmode,thevoltageatthePROGpinisproportionaltothecurrentbeingdeliveredtothebattery.PowerDissipation
TheconditionsthatcausetheLTC4053toreducechargecurrentduetothethermalprotectionfeedbackcanbeapproximatedbyconsideringthepowerdissipatedintheIC.Forhighchargecurrents,theLTC4053powerdissipa-tionisapproximately:PD=(VCC–VBAT•IBAT
wherePDisthepowerdissipated,VCCistheinputsupplyvoltage,VBATisthebatteryvoltage,andIBATisthebatterychargecurrent.Itisnotnecessarytoperformanyworst-casepowerdissipationscenariosbecausetheLTC4053willautomaticallyreducethechargecurrenttomaintainthedietemperatureatapproximately105°C.However,theapproximateambienttemperatureatwhichthethermalfeedbackbeginstoprotecttheICis:TA=105°C–PDθJA
TA=105°C–(VCC–VBAT•IBAT•θJA
Example:ConsideranLTC4053operatingfroma5Vwalladapterproviding1.2Atoa3.75VLi-Ionbattery.TheambienttemperatureabovewhichtheLTC4053willbegintoreducethe1.2Achargecurrentisapproximately:TA=105°C–(5V–3.75V•1.2A•40°C/WTA=105°C–1.5W•40°C/W=105°C–60°C=45°CTheLTC4053canbeusedabove45°C,butthechargecurrentwillbereducedbelow1.2A.Theapproximatechargecurrentatagivenambienttemperaturecanbeapproximatedby:
IBAT=
105°C–TA(VCC–VBAT•θJA
Considertheaboveexamplewithanambienttemperatureof55°C.Thechargecurrentwillbereducedtoapproxi-mately:
IBAT=
105°C–55°C50°C
==1A
(5V–3.75V•40°C/W50°C/A
U
Furthermore,thevoltageatthePROGpinwillchangeproportionallywiththechargecurrentasdiscussedintheProgrammingChargeCurrentsection.
ItisimportanttorememberthatLTC4053applicationsdonotneedtobedesignedforworst-casethermalconditionssincetheICwillautomaticallyreducepowerdissipationwhenthejunctiontemperaturereachesapproximately105°C.
BoardLayoutConsiderations
TheabilitytodelivermaximumchargecurrentunderallconditionsrequirethattheexposedmetalpadonthebacksideoftheLTC4053packagebesolderedtothePCboardground.Correctlysolderedtoa2500mm2double-sided1oz.copperboardtheLTC4053hasathermalresistanceofapproximately40°C/W.Failuretomakethermalcontactbetweentheexposedpadonthebacksideofthepackageandthecopperboardwillresultinthermalresistancesfargreaterthan40°C/W.Asanexample,acorrectlysolderedLTC4053candeliverover1250mAtoabatteryfroma5Vsupplyatroomtemperature.Withoutabacksidethermalconnection,thisnumbercoulddroptolessthan500mA.VCCBypassCapacitor
Manytypesofcapacitorscanbeusedforinputbypassing.However,cautionmustbeexercisedwhenusingmulti-layerceramiccapacitors.BecauseoftheselfresonantandhighQcharacteristicsofsometypesofceramiccapaci-tors,highvoltagetransientscanbegeneratedundersomestart-upconditions,suchasconnectingthechargerinputtoahotpowersource.FormoreinformationrefertoApplicationNote88.Stability
Theconstant-voltagemodefeedbackloopisstablewithoutanycompensationprovidedthatabatteryisconnected.However,a1µFcapacitorwitha1ΩseriesresistortoGNDisrecommendedattheBATpintokeepripplevoltagelowwhenthebatteryisdisconnected.Intheconstant-currentmodeitisthePROGpinthatisinthefeedbackloopandnotthebattery.Theconstant-currentmodestabilityisaffectedbytheimpedanceatthe
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LTC4053-4.2
APPLICATIOSIFORATIO
PROGpin.WithnoadditionalcapacitanceonthePROGpin,stabilityisacceptablewithprogramresistorvaluesashighas50k.However,additionalcapacitanceonthisnodereducesthemaximumallowedprogramresistor.ThepolefrequencyatthePROGpinshouldbekeptabove500kHz.Therefore,ifthePROGpinisloadedwithacapacitance,C,thefollowingequationshouldbeusedtocalculatethemaximumresistancevalueforRPROG:RPROG<1/(6.283•5×105•C
LTC4053
PROGGND5
7
RPROG
10kCFILTER
CHARGECURRENTMONITORCIRCUITRY
Figure5.IsolatingCapacitiveLoadonPROGPinandFiltering
PACKAGEDESCRIPTIO
DDPackage
10-LeadPlasticDFN(3mm×3mm
(ReferenceLTCDWG#05-08-1698
R=0.115
TYP6
0.675±0.05
0.38±0.1010
3.50±0.051.65±0.05
2.15±0.05(2SIDES
PACKAGEOUTLINE
0.25±0.05
0.50BSC
2.38±0.05(2SIDES
RECOMMENDEDSOLDERPADPITCHANDDIMENSIONS
NOTE:
1.DRAWINGTOBEMADEAJEDECPACKAGEOUTLINEM0-229VARIATIONOF(WEED-2.
CHECKTHELTCWEBSITEDATASHEETFORCURRENTSTATUSOFVARIATIONASSIGNMENT2.DRAWINGNOTTOSCALE
3.ALLDIMENSIONSAREINMILLIMETERS
PIN1TOPMARK(SEENOTE6
14
U
Average,ratherthaninstantaneous,batterycurrentmaybeofinteresttotheuser.Forexample,ifaswitchingpowersupplyoperatinginlow-currentmodeisconnectedinparallelwiththebatterytheaveragecurrentbeingpulledoutoftheBATpinistypicallyofmoreinterestthantheinstantaneouscurrentpulses.Insuchacase,asimpleRCfiltercanbeusedonthePROGpintomeasuretheaveragebatterycurrentasshowninFigure5.A10kresistorisaddedbetweenthePROGpinandthefiltercapacitorandmonitoringcircuittoensurestability.
4053F05
U
WUU
3.00±0.10(4SIDES1.65±0.10(2SIDES
(DD10DFN1103
5
0.200REF
0.75±0.05
2.38±0.10(2SIDES
1
0.25±0.050.50BSC
0.00–0.05
BOTTOMVIEW—EXPOSEDPAD
4.DIMENSIONSOFEXPOSEDPADONBOTTOMOFPACKAGEDONOTINCLUDE
MOLDFLASH.MOLDFLASH,IFPRESENT,SHALLNOTEXCEED0.15mmONANYSIDE5.EXPOSEDPADSHALLBESOLDERPLATED
6.SHADEDAREAISONLYAREFERENCEFORPIN1LOCATIONONTHETOPANDBOTTOMOFPACKAGE
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LTC4053-4.2
PACKAGEDESCRIPTIO
2.794±0.102(.110±.004
5.23(.206MIN
0.500.305±0.038
(.0197(.0120±.0015
BSCTYP
RECOMMENDEDSOLDERPADLAYOUT
0.254(.010
GAUGEPLANE
0.18(.007
NOTE:
1.DIMENSIONSINMILLIMETER/(INCH2.DRAWINGNOTTOSCALE
3.DIMENSIONDOESNOTINCLUDEMOLDFLASH,PROTRUSIONSORGATEBURRS.
MOLDFLASH,PROTRUSIONSORGATEBURRSSHALLNOTEXCEED0.152mm(.006"PERSIDE4.DIMENSIONDOESNOTINCLUDEINTERLEADFLASHORPROTRUSIONS.
INTERLEADFLASHORPROTRUSIONSSHALLNOTEXCEED0.152mm(.006"PERSIDE
5.LEADCOPLANARITY(BOTTOMOFLEADSAFTERFORMINGSHALLBE0.102mm(.004"MAX
InformationfurnishedbyLinearTechnologyCorporationisbelievedtobeaccurateandreliable.However,noresponsibilityisassumedforitsuse.LinearTechnologyCorporationmakesnorepresen-tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
U
MSEPackage10-LeadPlasticMSOP
(ReferenceLTCDWG#05-08-1663
BOTTOMVIEWOFEXPOSEDPADOPTION
0.889±0.127(.035±.005
1
2.06±0.102(.081±.0041.83±0.102(.072±.004
2.083±0.1023.2–3.45(.082±.004(.126–.136
10
3.00±0.102(.118±.004(NOTE3
109876
0.497±0.076(.0196±.003
REF
4.90±0.15(1.93±.006
DETAIL“A”
0°–6°TYP
12345
0.53±0.01(.021±.006
DETAIL“A”
SEATINGPLANE
1.10(.043MAX
3.00±0.102(.118±.004NOTE4
0.86(.034REF
0.17–0.27(.007–.011
TYP
0.50(.0197BSC
0.13±0.076(.005±.003
MSOP(MSE0802
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LTC4053-4.2
TYPICALAPPLICATIOS
USB/WallAdapterPowerLi-IonBatteryCharger
5VWALLADAPTER
LTC4053-4.2
BAT
USBPOWER
24.7µF
4
1k
TIMER
SHDN
8
SUSPEND
µC
3.74k
0.1µF
15k
100mA/500mA
VCC
9
1µF1Ω
IBAT
Li-IonBatteryChargerwithReversePolarityInputProtection
5VWALLADAPTER
LTC4053-4.2
92
VCCBAT84.7µF4
IBAT=1A
SHDN
TIMERGND
PROGNTC6
0.1µF5
RELATEDPARTS
PARTNUMBERLT1571LTC1729LTC1730LTC1731LTC1732LTC1733LTC1734LTC1734LLTC4050LTC4052LTC4054LTC4056
DESCRIPTION
200kHz/500kHzSwitchingBatteryCharger
Lithium-IonBatteryChargerTerminationControllersLithium-IonBatteryPulseCharger
Lithium-IonLinearBatteryChargerControllerLithium-IonLinearBatteryChargerControllerMonolithicLithium-IonLinearBatteryChargerLithium-IonLinearBatteryChargerinThinSOTTMLithium-IonLinearBatteryChargerControllerLithium-IonLinearBatteryChargerControllerLithium-IonLinearBatteryPulseChargerStandaloneLithium-IonLinearBatteryChargerinThinSOT
StandaloneLithium-IonLinearBatteryChargerControllerinThinSOT
COMMENTS
Upto1.5AChargeCurrent;PresetandAdjustableBatteryVoltagesTimeorChargeCurrentTermination,Preconditioning8-LeadMSOPNoBlockingDiodeRequired,CurrentLimitforMaximumSafetySimpleChargerusesExternalFET,FeaturesPresetVoltages,C/10ChargerDetectionandProgrammableTimer
SimpleChargerusesExternalFET,FeaturesPresetVoltages,C/10
ChargerDetectionandProgrammableTimer,InputPowerGoodIndicationStandaloneChargerwithProgrammableTimer,Upto1.5AChargeCurrentSimpleThinSOTCharger,NoBlockingDiode,NoSenseResistorNeeded50mAto180mA,NoBlockingDiode,NoSenseResistorNeededSimpleChargerusesExternalFET,ThermistorInputforBatteryTemperatureSensing
FullyIntegrated,StandalonePulseCharger,MinimalHeatDissipation,OvercurrentProtection
Upto800mAChargeCurrent,ThermalRegulation,USBCompatible,ChargeTermination
Upto700mAChargeCurrent,ChargeTermination,ContinuousChargingwithPoorlyRegulatedorHighImpedanceInputSupplies
4053fa
ThinSOTisatrademarkofLinearTechnologyCorporation.
16
LinearTechnologyCorporation
1630McCarthyBlvd.,Milpitas,CA95035-7417
(408432-1900●FAX:(408434-0507●www.linear.com
U
7
+
Li-IonCELL
GNDNTCPROG576
4053F06
FullFeaturedSingleCellLi-IonCharger
VIN=5V
1k
1k
4k
1%
1
4.7µF
8SHDN
2VCCACPR
1k
1-CELL+Li-IonBATTERY
10
1.5k1%
4053F07
3
CHRGFAULTLTC4053-4.269NTCBAT4TIMER
GND
0.1µF
5PROG
73k
1%
1µF
IBAT=500mA
RNTC10k
1Ω
Li-IonCELL
4053F08
LT/LT0705REVA•PRINTEDINUSA
©LINEARTECHNOLOGYCORPORATION2001

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