參數(shù)資料
型號(hào)： LTC4099EPDC#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, 0.55 MM HEIGHT, LEAD FREE, PLASTIC, UTQFN-20
文件頁數(shù)： 6/36頁
文件大小： 536K
代理商： LTC4099EPDC#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(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 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件
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
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