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LTC4011 Datasheet(PDF) 13 Page - Linear Technology

Part # LTC4011
Description  High Efficiency Standalone Nickel Battery Charger
PDF  26 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4011 Datasheet(HTML) 13 Page - Linear Technology

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LTC4011

4011fb
operaTion
Top-OffChargeState
IfNiMHfastchargeterminationoccursbecausethe
∆T/∆tlimitisexceededafteraninitialperiodoftMAX/12
hasexpired,theLTC4011entersthetop-offchargestate.
Top-offchargeisimplementedbysourcingone-tenththe
programmedchargecurrentfortMAX/3minutestoensure
that100%chargehasbeendeliveredtothebattery.The
CHRGandTOCstatusoutputsareactiveduringthetop-off
state.IfNiCdcellshavebeenselectedwiththeCHEMpin,
theLTC4011neverentersthetop-offstate.
AutomaticRechargeState
Oncechargingiscomplete,theautomaticrechargestate
isenteredtoaddresstheself-dischargecharacteristics
ofnickelchemistrycells.Thechargestatusoutputsare
inactive during automatic recharge, but VCDIVremains
switchedtoGNDtomonitortheaveragecellvoltage.Ifthe
VCELLvoltagedropsbelow1.325Vwithoutfallingbelow
350mV,thechargetimerisresetandanewfastcharge
cycleisinitiated.
TheinternalterminationalgorithmsoftheLTC4011are
adjustedwhenafastchargecycleisinitiatedfromauto-
maticrecharge,becausethebatteryshouldbealmostfully
charged.Voltage-basedterminationisenabledimmediately
andtheNiMH∆T/∆tlimitisfixedatabatterytemperature
riseof1°C/minute.
FaultState
Asdiscussedpreviously,theLTC4011entersthefaultstate
basedondetectionofinvalidbatteryvoltagesduringvari-
ouschargingphases.TheICalsomonitorstheregulation
ofthePWMcontrolloopandwillenterthefaultstateif
thisisnotwithinacceptablelimits.Onceinthefaultstate,
thebatterymustberemovedorDCinputpowermustbe
cycledinordertoinitiatefurthercharging.Inthefault
state,theFAULToutputisactive,theREADYoutputis
inactive,chargingstopsandthechargeindicatoroutputs
areinactive.TheVCDIVoutputremainsconnectedtoGND
toallowdetectionofbatteryremoval.
NotethattheLTC4011alsousestheFAULToutputtoindi-
catethatchargingissuspendedduetoinvalidbatteryor
internaldietemperatures.However,theICdoesnotenter
thefaultstateinthesecasesandnormaloperationwill
resumewhenalltemperaturesreturntoacceptablelevels.
RefertotheStatusOutputssectionformoredetail.
InsertionandRemovalofBatteries
TheLTC4011automaticallysensestheinsertionorremoval
ofabatterybymonitoringtheVCELLpinvoltage.Should
thisvoltagefallbelow350mV,theICconsidersthebat-
terytobeabsent.Removingandtheninsertingabattery
causestheLTC4011toinitiateacompletelynewcharge
cyclebeginningwithchargequalification.
ExternalPauseControl
Afterchargingisinitiated,theVTEMPpinmaybeusedto
pauseoperationatanytime.Whenthevoltagebetween
VTEMPandGNDdropsbelow200mV,thechargetimer
pauses,fastchargeterminationalgorithmsareinhibited
andthePWMoutputsaredisabled.ThestatusandVCDIV
outputsallremainactive.Normalfunctionisfullyrestored
fromthepreviousstatewhenpauseends.
StatusOutputs
TheLTC4011open-drainstatusoutputsprovidevaluable
information about the IC’s operating state and can be
usedforavarietyofpurposesinapplications.Table1
summarizesthestateofthefourstatusoutputsandthe
VCDIVpinasafunctionofLTC4011operation.Thestatus
outputscandirectlydrivecurrent-limitedLEDsterminated
totheDCinput.TheVCDIVcolumninTable1isstrictly
informational.VCDIVshouldonlybeusedfortheVCELL
resistordivider,aspreviouslydiscussed.
Table1.LTC4011StatusPins
READY FAULT
CHRG
TOC
VCDIV
CHARGERSTATE
Off
Off
Off
Off
Off
Off
On
Off
Off
Off
On
ReadytoCharge
(VTEMPHeldLow)
orAutomaticRecharge
On
Off
On
Off
On
PrechargeorFastCharge
(MaybePaused)
On
Off
On
On
On
NiMHTop-OffCharge
(MaybePaused)
On
On
OnorOff OnorOff On
TemperatureLimits
Exceeded
Off
On
Off
Off
On
FaultState(Latched)



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