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參數(shù)資料
| 型號： | 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)： | 9/36頁 |
| 文件大?。?/td> | 536K |
| 代理商： | LTC4099EPDC#TRPBF |
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LTC4099
4099fd
Iftheloadcurrentincreasesbeyondthepowerallowed
fromtheswitchingregulator,additionalpowerwillbepulled
fromthebatteryviatheidealdiodes.Furthermore,ifpower
toVBUS(USBorwalladapter)isremoved,thenallofthe
applicationpowerwillbeprovidedbythebatteryviathe
idealdiodes.Theidealdiodeswillbefastenoughtokeep
VOUTfromdroopingwithonlythestoragecapacitance
required for the switching regulator. The internal ideal
diodeconsistsofaprecisionamplifierthatactivatesa
largeon-chipMOSFETtransistorwheneverthevoltageat
VOUTisapproximately15mV(VFWD)belowthevoltageat
BAT.Withintheamplifier’slinearrange,thesmall-signal
resistanceoftheidealdiodewillbequitelow,keeping
theforwarddropnear15mV.Athighercurrentlevels,the
MOSFETwillbeinfullconduction.
Precharge
Whenabatterychargecyclebegins,thebatterycharger
firstdeterminesifthebatteryisdeeplydischarged.Ifthe
batteryvoltageisbelowVTRKL,typically2.85V,anautomatic
tricklechargefeaturesetsthebatterychargecurrentto
one-fifthofthedefaultchargecurrent.Ifthelowvoltage
persistsformorethanone-halfhour,thebatterycharger
automaticallyterminatesandindicatesviatheI2Cport
thatthebatterywasunresponsive.
Constant-Current
OncethebatteryvoltageisaboveVTRKL,thechargerbegins
charginginfullpowerconstant-currentmode.Thecurrent
deliveredtothebatterywilltrytoreachVPROG/RPROG
1030whereVPROGcanbesetbytheI2Cportandranges
from500mVto1.2Vin100mVsteps.Thedefaultvalue
ofVPROGis500mV.Dependingonavailableinputpower
andexternalloadconditions,thebatterychargermayor
maynotbeabletochargeatthefullprogrammedrate.
Theexternalloadwillalwaysbeprioritizedoverthebattery
chargecurrent.Likewise,theUSBcurrentlimitprogram-
mingwillalwaysbeobservedandonlyadditionalpower
willbeavailabletochargethebattery.Whensystemloads
arelight,batterychargecurrentwillbemaximized.
Asmentionedabove,theupperlimitofchargecurrentis
programmedbythecombinationofaresistorfromPROG
togroundandthePROGservovoltagevaluesetinthe
I2Cport.Thechargecurrentwillbegivenbythefollowing
expression:
ICHG =
VPROG
RPROG
1030
EightvaluesofVPROGmaybeselectedbytheICHARGE2,
ICHARGE1andICHARGE0bitsintheI2Cport.SeeTable3.
Ineithertheconstant-currentorconstant-voltagecharging
modes,thevoltageatthePROGpinwillbeproportionalto
theactualchargecurrentdeliveredtothebattery.Thecharge
currentcanbedeterminedatanytimebymonitoringthe
PROGpinvoltageandusingthefollowingrelationship:
IBAT =
VPROG
RPROG
1030
FORWARD VOLTAGE (mV) (BAT – VOUT)
0
CURRENT
(mA)
600
1800
2000
2200
120
240 300
4099 F03
200
1400
1000
400
1600
0
1200
800
60
180
360
480
420
VISHAY Si2333
EXTERNAL
IDEAL DIODE
LTC4099
IDEAL DIODE
ON
SEMICONDUCTOR
MBRM120LT3
Figure 3. Ideal Diode V-I Characteristics
operaTion
To supplement the internal ideal diode, an external
P-channelMOSFETtransistormaybeaddedfromBATto
VOUT.TheIDGATEpinoftheLTC4099drivesthegateof
theexternalP-channelMOSFETtransistorforautomatic
idealdiodecontrol.ThesourceoftheexternalP-channel
MOSFETshouldbeconnectedtoVOUTandthedrainshould
beconnectedtoBAT.Capableofdrivinga1nFload,the
IDGATEpincancontrolanexternalP-channelMOSFET
transistorhavinganon-resistanceof30mΩorlower.
Battery Charger
TheLTC4099includesabatterychargerwithlowvoltage
precharge,constant-current/constant-voltagecharging,C/x
state-of-chargedetection,automaticterminationbysafety
timer,automaticrecharge,badcelldetectionandthermistor
sensorinputforout-of-temperaturechargepausing.
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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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