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參數(shù)資料
| 型號： | LTC4011CFE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Standalone Nickel Battery Charger; Package: TSSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| 中文描述： | BATTERY CHARGE CONTROLLER, 640 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20 |
| 文件頁數(shù)： | 4/26頁 |
| 文件大?。?/td> | 653K |
| 代理商： | LTC4011CFE#TRPBF |
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LTC4011
4011fb
operaTion
ShutdownState
TheLTC4011remainsinmicropowershutdownuntilDCIN
(Pin1)isdrivenaboveVCC(Pin18).Inshutdownallstatus
andPWMoutputsandinternallygeneratedterminations
orsupplyvoltagesareinactive.Currentconsumptionfrom
VCCandBATisreducedtoaverylowlevel.
ChargeQualificationState
Once DCIN is greater than VCC, the LTC4011 exits
micropowershutdown,enablesitsowninternalsupplies,
providesVRTvoltagefortemperaturesensing,andswitches
VCDIVtoGNDtoallowmeasurementoftheaveragesingle-
cellvoltage.TheICalsoverifiesthatVCCisatorabove4.2V,
VCCis510mVaboveBATandVCELLisbetween350mVand
1.95V.IfVCELLisbelow350mV,nochargingwilloccur,and
ifVCELLisabove1.95V,thefaultstateisentered,which
isdescribedinmoredetailbelow.Onceadequatevoltage
conditionsexistforcharging,READYisasserted.
IfthevoltagebetweenVTEMPandGNDisbelow200mV,the
LTC4011ispaused.IfVTEMPisabove200mVbutbelow
2.85V,theLTC4011verifiesthatthesensedtemperatureis
between5°Cand45°C.Ifthesetemperaturelimitsarenot
metorifitsowndietemperatureistoohigh,theLTC4011
willindicateafaultandnotallowchargingtobegin.IfVTEMP
isgreaterthan2.85V,batterytemperaturerelatedcharge
qualification,monitoringandterminationaredisabled.
Oncechargingisfullyqualified,prechargebegins(unless
theLTC4011ispaused).Inthatcase,theVTEMPpinis
monitoredforfurthercontrol.Thechargestatusindicators
andPWMoutputsremaininactiveuntilchargingbegins.
ChargeMonitoring
TheLTC4011continuestomonitorimportantvoltageand
temperatureparametersduringallchargingstates.Ifthe
DCinputisremoved,chargingstopsandtheshutdown
stateisentered.IfVCCdropsbelow4.25VorVCELLdrops
below350mV,chargingstopsandtheLTC4011returns
tothechargequalificationstate.IfVCELLexceeds1.95V,
chargingstopsandtheICentersthefaultstate.Ifanexternal
thermistorindicatessensedtemperatureisbeyondarange
of5°Cto60°C,ortheinternaldietemperatureexceedsan
internalthermallimit,chargingissuspended,thecharge
timerispausedandtheLTC4011indicatesafaultcondition.
Normalchargingresumesfromthepreviousstatewhen
thesensedtemperaturereturnstoasatisfactoryrange.In
addition,otherbatteryfaultsaredetectedduringspecific
chargingstatesasdescribedbelow.
PrechargeState
IftheinitialvoltageonVCELLisbelow900mV,theLTC4011
enterstheprechargestateandenablesthePWMcurrent
sourcetotricklechargeusingone-fifththeprogrammed
chargecurrent.TheCHRGstatusoutputisactiveduring
precharge. The precharge state duration is limited to
tMAX/12minutes,wheretMAXisthemaximumfastcharge
periodprogrammedwiththeTIMERpin.IfsufficientVCELL
voltagecannotbedevelopedinthislengthoftime,thefault
stateisentered,otherwisefastchargebegins.
FastChargeState
Ifadequateaveragesingle-cellvoltageexists,theLTC4011
entersthefastchargestateandbeginschargingatthe
programmedcurrentsetbytheexternalcurrentsense
resistor connected between the SENSE and BAT pins.
TheCHRGstatusoutputisactiveduringfastcharge.If
VCELLisinitiallyabove1.325V,voltage-basedtermination
processingbeginsimmediately.Otherwise–Vtermination
isdisabledforastabilizationperiodoftMAX/12.Inthat
case,theLTC4011makesanotherfaultcheckattMAX/12,
requiringtheaveragecellvoltagetobeabove1.22V.This
ensuresthebatterypackisacceptingafastcharge.If
VCELLisnotabovethisvoltagethreshold,thefaultstateis
entered.FastchargestatedurationislimitedtotMAXand
thefaultstateisenteredifthislimitisexceeded.
ChargeTermination
Fastchargeterminationparametersaredependentupon
thebatterychemistryselectedwiththeCHEMpin.Voltage-
basedtermination(–V)isalwaysactiveaftertheinitial
voltagestabilizationperiod.Ifanexternalthermistornetwork
ispresent,chemistry-specificlimitsforT/t(rateoftem-
peraturerise)arealsousedintheterminationalgorithm.
Temperature-basedtermination,ifenabled,becomesactive
assoonasthefastchargestateisentered.Successful
chargeterminationrequiresachargeratebetweenC/2and
2C.Lowerratesmaynotproducethebatteryvoltageand
temperatureprofilerequiredforchargetermination.
(RefertoFigure1)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4011EFE | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency Standalone Nickel Battery Charger |
| LTC4012 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4012-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4012-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Effi ciency, Multi-Chemistry Battery Charger with PowerPath Control |
| LTC4012-3 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control |
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