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): 16/36頁
文件大?。?/td> 536K
代理商: LTC4099EUDC#TRPBF
LTC4099
4099fd
operaTion
The battery charger current settings are decoded in
Table3.Thebatterychargercurrentsettingsareadjusted
byselectingoneoftheeightservovoltagesforthePROG
pin.Recallthattheprogrammedchargecurrentisgiven
bytheexpression:
ICHG =
VPROG
RPROG
1030
Thedefaultstateforthebatterychargercurrentsettingsis
000,givingthelowestavailableservovoltageof500mV.
TheCOVERX1andCOVERX0bitsaredecodedinTable4.
The C/x setting controls the PROG pin level that the
LTC4099’s C/x comparator uses to report full capacity
charge.Forexample,ifthe100mVsettingischosen,then
theLTC4099reportsthatitsPROGpinvoltagehasfallen
below 100mV. For the 50mV setting, LTC4099 reports
thatitsPROGpinvoltagehasfallenbelow50mV.TheC/x
settingsareadjustedbycomparingthePROGpinvoltage
withthevaluesshowsinTable4.Thedefaultvalueforthe
C/xsettingis00,giving100mVdetection.
Thesecondbyteofdataatsubaddress0x01controlsthe
threebatterychargersafetytimerbits,TIMER2-TIMER0,
the DISABLE_CHARGER bit, the ENABLE_BATTERY_
CONDITIONERbit,theVFLOAT=4.2Vcontrolbitandthe
TREG=85°Ccontrolbit.
TheTIMER2–TIMER0bitscontrolthedurationofthebat-
terychargersafetytimer.Thesafetytimerstartsoncethe
LTC4099reachesthe4.100Vorthe4.200Vfloatvoltage.
Aslongasinputpowerisavailable,chargingwillcon-
tinueinfloatvoltagemodeuntilthesafetytimerexpires.
Table 1. LTC4099 Input Data Bytes
SUB ADDRESS 0
SUB ADDRESS 1
SUB ADDRESS 2
COMMAND
REGISTER 0
COMMAND
REGISTER 1
IRQ MASK
REGISTER
Bit7
ILIM2
TIMER2
USBGOOD
Bit6
ILIM1
TIMER1
WALLGOOD
Bit5
ILIM0
TIMER0
BADCELL
Bit4
ICHARGE2
DISABLE_CHARGER
THERMAL_REG
Bit3
ICHARGE1
ENABLE_BATTERY_
CONDITIONER
THERMISTOR_
STATUS
Bit2
ICHARGE0
VFLOAT=4.2V
CHARGER_STATUS
Bit1
COVERX1
TREG=85°C
NotUsed
Bit0
COVERX0
NotUsed
Table 2. ILIM2 – ILIM0 Decode
USB INPUT CURRENT LIMIT SETTINGS
ILIM2
ILIM1
ILIM0
IUSB
0
100mA*
0
1
500mA
0
1
0
620mA
0
1
790mA
1
0
1000mA
1
0
1
1200mA
1
0
SuspendLow(500A)
1
SuspendHigh(2.5mA)
*DefaultSetting
Table 3. ICHARGE2 – ICHARGE0 Decode
BATTERY CHARGER CURRENT LIMIT SETTINGS
ICHARGE2
ICHARGE1
ICHARGE0
VPROG
CHARGE CURRENT
RPROG = 1.02k
0
500mV*
500mA
0
1
600mV
600mA
0
1
0
700mV
700mA
0
1
800mV
800mA
1
0
900mV
900mA
1
0
1
1000mV
1000mA
1
0
1100mV
1100mA
1
1200mV
1200mA
*DefaultSetting
Table 4. C/x Decode
C/x INDICATION SETTINGS
COVERX1
COVERX0
VPROG
FULL CAPACITY CHARGE
INDICATION
RPROG = 1.02k
0
100mV*
100mA*
0
1
50mV
50mA
1
0
200mV
200mA
1
500mV
500mA
*DefaultSetting
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