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LTC4011CFE Datasheet(PDF) 9 Page - Linear Technology

Part # LTC4011CFE
Description  High Efficiency Standalone Nickel Battery Charger
Download  26 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4011CFE Datasheet(HTML) 9 Page - Linear Technology

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LTC4011

4011fb
pin FuncTions
VCDIV(Pin9):AverageCellVoltageResistorDividerTermi-
nation.TheLTC4011connectsthispintoGNDprovidedthe
chargerisnotinshutdown.VCDIVisanopen-drainoutput
toGNDwithanoperatingvoltagerangeofGNDtoBAT.
TIMER(Pin10):ChargeTimerInput.Aresistorconnected
betweenTIMERandGNDprogramschargecycletiming
limits.RefertotheApplicationsInformationsectionfor
completedetails.OperatingvoltagerangeisGNDto1V.
SENSE(Pin11):ChargeCurrentSenseInput.Anexternal
resistorbetweenthisinputandBATisusedtoprogram
charge current. Refer to the Applications Information
section for complete details on programming charge
current.Operatingvoltagerangesfrom(BAT–50mV)to
(BAT+200mV).
BAT(Pin12):BatteryPackConnection.TheLTC4011uses
thevoltageonthispintocontrolcurrentsourcedfrom
VCCtothebatteryduringcharging.Allowableoperating
voltagerangeisGNDtoVCC.
TOC(Pin13):Active-LowTop-OffChargeIndicatorOut-
put.TheLTC4011indicatesthetop-offchargestatefor
NiMHbatteriesbyconnectingthispintoGND.Referto
theOperationandApplicationsInformationsectionsfor
furtherdetails.ThisoutputiscapableofdrivinganLED
andshouldbeleftfloatingifnotused.TOCisanopen-
drainoutputtoGNDwithanoperatingvoltagerangeof
GNDtoVCC.
INTVDD(Pin14):Internal5VRegulatorOutput.Thispin
providesameansofbypassingtheinternal5Vregulator
usedtopowertheBGATEoutputdriver.Typically,power
should not be drawn from this pin by the application
circuit.RefertotheApplicationInformationsectionfor
additionaldetails.
BGATE(Pin15):ExternalSynchronousN-channelMOSFET
GateControlOutput.Thisoutputprovidesgatedriveto
anoptionalexternalNMOSpowertransistorswitchused
forsynchronousrectificationtoincreaseefficiencyinthe
step-downDC/DCconverter.OperatingvoltageisGNDto
INTVDD.BGATEshouldbeleftfloatingifnotused.
PGND(Pin16):PowerGround.Thispinprovidesareturn
forswitchingcurrentsgeneratedbyinternalLTC4011cir-
cuits.Externally,PGNDandGNDshouldbewiredtogether
usingaverylowimpedanceconnection.RefertoPCB
Layout Considerations in the Applications Information
sectionforadditionalgroundingdetails.
TGATE(Pin17):ExternalP-channelMOSFETGateControl
Output.ThisoutputprovidesgatedrivetoanexternalPMOS
powertransistorswitchusedintheDC/DCconverter.Op-
eratingvoltagerangevariesasafunctionofVCC.Referto
theElectricalCharacteristicstableforspecificvoltages.
VCC(Pin18):PowerInput.ExternalPowerPathcontrol
circuitsnormallyconnecteithertheDCinputpowersup-
plyorthebatterytothispin.RefertotheApplications
Informationsectionforfurtherdetails.Suggestedapplied
voltagerangeisGNDto34V.
READY (Pin 19): Active-Low Ready-to-Charge Output.
TheLTC4011connectsthispintoGNDifproperoperating
voltagesforchargingarepresent.RefertotheOperation
sectionforcompletedetailsonchargequalification.This
outputiscapableofdrivinganLEDandshouldbeleft
floatingifnotused.READYisanopen-drainoutputto
GNDwithanoperatingvoltagerangeofGNDtoVCC.
INFET(Pin20):PowerPathControlOutput.Forverylow
dropoutapplications,thisoutputmaybeusedtodrive
the gate of an input PMOS pass transistor connected
betweentheDCinput(DCIN)andtherawsystemsupply
rail(VCC).INFETisinternallyclampedabout6VbelowVCC.
MaximumoperatingvoltageisVCC.INFETshouldbeleft
floatingifnotused.
Exposed Pad (Pin 21): This pin provides enhanced
thermalpropertiesfortheTSSOP.Itmustbesoldered
tothePCBcoppergroundtoobtainoptimumthermal
performance.


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