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LTC4011 Datasheet(PDF) 8 Page - Linear Technology |
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LTC4011 Datasheet(HTML) 8 Page - Linear Technology |
8 / 26 page 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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