參數(shù)資料
型號(hào)： LTC4099EPDC#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC20
封裝： 3 X 4 MM, 0.55 MM HEIGHT, LEAD FREE, PLASTIC, UTQFN-20
文件頁(yè)數(shù)： 13/36頁(yè)
文件大?。?/td> 536K
代理商： LTC4099EPDC#TRPBF
LTC4099
0
4099fd
Overtemperature Battery Conditioner
Since Li-Ion batteries deteriorate with full voltage and
high temperature, the LTC4099 contains an automatic
batteryconditionercircuitthatreducesthebatteryvolt-
ageifbothhightemperatureandhighvoltagearepresent
simultaneously.
Recallthatbatterychargingisinhibitedifthethermistor
temperaturereaches45°C.Ifthethermistortemperature
climbsabove60°C,andthebatteryconditionercircuitis
enabled,aninternalloadofapproximately180mAisap-
pliedtoBAT.Oncethebatteryvoltagedropsto3.9V,orthe
thermistorreadingdropsbelow58°C,theinternalloadis
disabled.Batterychargingresumesoncethethermistor
temperaturedropsbelow42°C.
WhenactivatedviatheI2Cport,thebatteryconditioner
operates whether or not external power is available,
charginghasterminatedorcharginghasbeendisabled
byI2Ccontrol.
Notethatthiscircuitcandissipatesignificantpowerinside
theLTC4099.Topreventanexcessivetemperaturerise
oftheLTC4099,theLTC4099reducesdischargecurrent
asneededtopreventajunctiontemperatureriseabove
120°C.
Thermal Regulation
TopreventthermaldamagetotheLTC4099orsurrounding
componentsduringnormalcharging,aninternalthermal
feedbackloopwillautomaticallydecreasetheprogrammed
chargecurrentifthedietemperaturerisesto105°C.This
thermalregulationtechniqueprotectstheLTC4099from
excessivetemperatureduetohighpoweroperationorhigh
ambientthermalconditions,andallowstheusertopush
thelimitsofthepowerhandlingcapabilitywithagiven
circuitboarddesign.ThebenefitoftheLTC4099thermal
regulationloopisthatchargecurrentcanbesetaccording
toactual,ratherthanworst-case,conditionsforagiven
applicationwiththeassurancethatthechargerwillauto-
maticallyreducethecurrentinworst-caseconditions.
Thethermalregulationset-pointcanbeadjusteddownto
85°Cfromthedefault105°CsettingusingtheI2Cport,as
explainedintheInputDatasection.
Overvoltage Protection
TheLTC4099canprotectitselffromtheinadvertentap-
plicationofexcessivevoltagetoVBUSorWALLwithjust
twoexternalcomponents:anN-channelMOSFETanda
6.2kresistor.Themaximumsafeovervoltagemagnitude
willbedeterminedbythechoiceoftheexternalFETand
itsassociateddrainbreakdownvoltage.
Theovervoltageprotectioncircuitconsistsoftwopins.The
first,OVSENS,isusedtomeasuretheexternallyapplied
voltagethroughanexternalresistor.Thesecond,OVGATE,
isanoutputusedtodrivethegatepinoftheexternalFET.
WhenOVSENSisbelow6V,aninternalchargepumpwill
driveOVGATEtoapproximately1.88OVSENS.Thiswill
enhancetheN-channelFETandprovidealowimpedance
connectiontoVBUSorWALLwhichwill,inturn,power
theLTC4099.IfOVSENSshouldriseabove6Vduetoa
faultoruseofanincorrectwalladapter,OVGATEwillbe
pulledtoGND,disablingtheexternalFETand,therefore,
protectingtheLTC4099.Whenthevoltagedropsbelow
6Vagain,theexternalFETwillbere-enabled.
SeetheApplicationsInformationsectionforexamplesof
multipleinputprotections,reverseinputprotectionand
recommendedcomponents.
Suspend LDO
TheLTC4099providesasmallamountofpowertoVOUT
insuspendmodebyincludinganLDOfromVBUStoVOUT.
ThisLDOwillpreventthebatteryfromrunningdownwhen
theportableproducthasaccesstoasuspendedUSBport.
Regulatingat4.6V,thisLDOonlybecomesactivewhen
theinternalswitchingconverterisdisabled.Toremain
compliantwiththeUSBspecification,theinputtotheLDO
iscurrent-limitedsothatitwillnotexceedthelowpower
orhighpowersuspendspecification.IftheloadonVOUT
exceedsthesuspendcurrentlimit,theadditionalcurrent
willcomefromthebatteryviatheidealdiodes.Thesus-
pendLDOsendsascaledcopyoftheVBUScurrenttothe
CLPROGpin,whichwillservotoamaximumvoltageof
approximately100mV.Thus,thehighpowerandlowpower
suspendsettingsarerelatedtothelevelsprogrammedby
thesameCLPROGresistorforthe100mA,500mAand
otherswitchingpowerpathsettings.Commandbits,ILIM2
operaTion
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4099EUDC#PBF 功能描述:IC USB PWR MANAGER/CHRGR 20-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:PowerPath™ 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR)
LTC4099EUDC#PBF 制造商:Linear Technology 功能描述:IC BATTERY CHARGER 1.2A UTQFN-20
LTC4099EUDC#TRPBF 功能描述:IC USB PWR MANAGER/CHRGR 20-QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電池管理 系列:PowerPath™ 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤(pán) 包裝:管件
LTC4100 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Dual Smart Battery System Manager Available in 48-Lead TSSOP Package
LTC4100_09 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Smart Battery Charger Controller
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