參數(shù)資料
型號： LTC4099EUDC#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PQCC20
封裝： 3 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20
文件頁數(shù)： 6/36頁
文件大?。?/td> 536K
代理商： LTC4099EUDC#TRPBF
LTC4099
4099fd
Introduction
The LTC4099 is an I2C controlled power manager and
Li-Ionchargerdesignedtomakeoptimaluseofthepower
availablefromavarietyofsourceswhileminimizingpower
dissipationandeasingthermalbudgetingconstraints.The
innovativePowerPatharchitectureensuresthattheap-
plicationispoweredimmediatelyafterexternalvoltageis
applied,evenwithacompletelydeadbattery,byprioritizing
powertotheapplication.
TheLTC4099includesaBat-Trackmonolithicstep-down
switchingregulatorforUSB,walladaptersandother5V
sources.DesignedspecificallyforUSBapplications,the
switchingregulatorincorporatesaprecisionaveragein-
putcurrentlimitforUSBcompatibility.Becausepoweris
conserved,theLTC4099allowstheloadcurrentonVOUTto
exceedthecurrentdrawnbytheUSBportmakingmaximum
useoftheallowableUSBpowerforbatterycharging.The
switchingregulatorandbatterychargercommunicateto
ensurethattheaverageinputcurrentneverexceedsthe
USBspecifications.
Forautomotiveandotherhighvoltageapplications,the
LTC4099providesBat-TrackcontrolofanexternalLinear
Technologystep-downswitchingregulatortomaximizebat-
terychargerefficiencyandminimizeheatproduction.
WhenpowerisavailablefromboththeUSBandanaux-
iliaryinput,theauxiliaryinputisprioritized.
TheLTC4099containsbothaninternal180mΩidealdiode
aswellasanidealdiodecontrollerforusewithanexternal
P-channelMOSFET.TheidealdiodesfromBATtoVOUT
guaranteethatamplepowerisalwaysavailabletoVOUTeven
ifthereisinsufficientorabsentpoweratVBUSorWALL.
TheLTC4099featuresanovervoltageprotectioncircuit
which is designed to work with an external N-channel
MOSFETtopreventdamagetoitsinputcausedbyac-
cidentalapplicationofhighvoltage.
Topreventbatterydrainwhenadeviceisconnectedtoa
suspendedUSBport,anLDOfromVBUStoVOUTprovides
eitheralowpowerorhighpowerUSBsuspendcurrent
totheapplication.
Finally,theLTC4099hasconsiderableadjustabilitybuilt
in so that power levels and status information can be
controlledandmonitoredviaasimpletwowireI2Cport.
Bat-Track Input Current Limited Step-Down Switching
Regulator
ThepowerdeliveredfromVBUStoVOUTiscontrolledbya
2.25MHzconstant-frequencystep-downswitchingregu-
lator.TomeetthemaximumUSBloadspecification,the
switchingregulatorcontainsameasurementandcontrol
systemwhichensuresthattheaverageinputcurrentre-
mainsbelowthelevelprogrammedattheCLPROGpin
andI2Cport.VOUTdrivesthecombinationoftheexternal
loadandthebatterycharger.
Ifthecombinedloaddoesnotcausetheswitchingpower
supplytoreachtheprogrammedinputcurrentlimit,VOUT
willtrackapproximately0.3Vabovethebatteryvoltage.
Bykeepingthevoltageacrossthebatterychargeratthis
lowlevel,powerlosttothebatterychargerisminimized.
Figure1showsthepowerpathcomponents.
Ifthecombinedexternalloadplusbatterychargecurrent
islargeenoughtocausetheswitchingpowersupplyto
reach the programmed input current limit, the battery
chargerwillreduceitschargecurrentbypreciselythe
amountnecessarytoenabletheexternalloadtobesatis-
fied.Evenifthebatterychargecurrentisprogrammedto
exceedtheallowableUSBpower,theUSBspecification
foraverageinputcurrentwillnotbeviolated;thebattery
chargerwillreduceitscurrentasneeded.Furthermore,if
theloadcurrentatVOUTexceedstheprogrammedpower
fromVBUS,theextraloadcurrentwillbedrawnfromthe
batteryviatheidealdiodesevenwhenthebatterycharger
isenabled.
ThecurrentoutofCLPROGisaprecisefractionofthe
VBUScurrent.Whenaprogrammingresistorandanav-
eragingcapacitorareconnectedfromCLPROGtoGND,
the voltage on CLPROG represents the average input
currentoftheswitchingregulator.Astheinputcurrent
approaches the programmed limit, CLPROG reaches
1.18Vandpowerdeliveredbytheswitchingregulator
isheldconstant.
Theinputcurrentlimithaseightpossiblesettingsrang-
ing from the USB suspend limit of 500A up to 1.2A
forwalladapterapplications.Twoofthesesettingsare
specificallyintendedforuseinthe100mAand500mA
USBapplications.
operaTion
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相關代理商/技術參數(shù)
參數(shù)描述
LTC4100 制造商:LINER 制造商全稱: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:Linear Technology 功能描述:Smart Battery Charger Controller
LTC4100EG 功能描述:IC SMART BATTERY CHARGER 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學: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 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR)
LTC4100EG#PBF 功能描述:IC SMART BATTERY CHARGER 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關文件:STC3100 View All Specifications 特色產品:STC3100 - Battery Monitor IC 標準包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學:鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2
LTC4100EG#TR 功能描述:IC CHARGER SMART BATTERY 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學: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 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR)
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