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LTC4011 Datasheet(PDF) 8 Page - Linear Technology

Part # LTC4011
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

LTC4011 Datasheet(HTML) 8 Page - Linear Technology

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LTC4011

4011fb
pin FuncTions
DCIN(Pin1):DCPowerSenseInput.TheLTC4011senses
voltage on this pin to determine when an external DC
powersourceispresent.Thisinputshouldbeisolated
fromVCCbyablockingdiodeorPowerPathFET.Referto
theApplicationsInformationsectionforcompletedetails.
OperatingvoltagerangeisGNDto34V.
FAULT (Pin 2): Active-Low Fault Indicator Output. The
LTC4011indicatesvariousbatteryandinternalfaultcondi-
tionsbyconnectingthispintoGND.RefertotheOperation
andApplicationsInformationsectionsforfurtherdetails.
ThisoutputiscapableofdrivinganLEDandshouldbe
leftfloatingifnotused.FAULTisanopen-drainoutputto
GNDwithanoperatingvoltagerangeofGNDtoVCC.
CHRG(Pin3):Active-LowChargeIndicatorOutput.The
LTC4011indicatesitisprovidingchargetothebatteryby
connectingthispintoGND.RefertotheOperationand
ApplicationsInformationsectionsforfurtherdetails.This
outputiscapableofdrivinganLEDandshouldbeleft
floatingifnotused.CHRGisanopen-drainoutputtoGND
withanoperatingvoltagerangeofGNDtoVCC.
CHEM(Pin4):BatteryChemistrySelectionInput.This
pinshouldbewiredtoGNDtoselectNiMHfastcharge
terminationparameters.Ifavoltagegreaterthan2.85Vis
appliedtothispin,oritisleftfloating,NiCdparameters
areused.RefertotheApplicationsInformationsectionfor
furtherdetails.OperatingvoltagerangeisGNDto3.3V.
GND(Pin5):Ground.Thispinprovidesasingle-point
groundforinternalreferencesandothercriticalanalog
circuits.
VRT(Pin6):ThermistorNetworkTerminationOutput.The
LTC4011provides3.3Vonthispintodriveanexternal
thermistornetworkconnectedbetweenVRT,VTEMPand
GND.Additionalpowershouldnotbedrawnfromthispin
bythehostapplication.
VTEMP(Pin7):BatteryTemperatureInput.Anexternal
thermistornetworkmaybeconnectedtoVTEMPtoprovide
temperature-basedchargequalificationandadditional
fastchargeterminationcontrol.Chargingmayalsobe
pausedbyconnectingtheVTEMPpintoGND.Referto
theOperationandApplicationsInformationsectionsfor
completedetailsonexternalthermistornetworksand
chargecontrol.Ifthispinisnotuseditshouldbewired
toVRT.OperatingvoltagerangeisGNDto3.3V.
VCELL(Pin8):AverageSingle-CellVoltageInput.Anexter-
nalvoltagedividerbetweenBATandVCDIVisattachedto
thispintomonitortheaveragesingle-cellvoltageofthe
batterypack.TheLTC4011usesthisinformationtoprotect
againstcatastrophicbatteryovervoltageandtocontrol
thechargingstate.RefertotheApplicationsInformation
sectionforfurtherdetailsontheexternaldividernetwork.
OperatingvoltagerangeisGNDtoBAT.
INTVDDVoltage
INTVDDShort-CircuitCurrent
Typical perForMance characTerisTics


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