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参数资料
| 型号： | LTC4099EUDC#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 23/36页 |
| 文件大小： | 0K |
| 描述： | IC USB PWR MANAGER/CHRGR 20-QFN |
| 标准包装： | 91 |
| 系列： | PowerPath™ |
| 功能： | 电源管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.35 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（3x4） |
| 包装： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
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LTC4099
OPERATION
I CHG = PROG ? 1030
The battery charger current settings are decoded in
Table 3. The battery charger current settings are adjusted
by selecting one of the eight servo voltages for the PROG
pin. Recall that the programmed charge current is given
by the expression:
V
R PROG
The default state for the battery charger current settings is
000, giving the lowest available servo voltage of 500mV.
The COVERX1 and COVERX0 bits are decoded in Table 4.
The C/x setting controls the PROG pin level that the
LTC4099’s C/x comparator uses to report full capacity
charge. For example, if the 100mV setting is chosen, then
the LTC4099 reports that its PROG pin voltage has fallen
Table 1. LTC4099 Input Data Bytes
below 100mV. For the 50mV setting, LTC4099 reports
that its PROG pin voltage has fallen below 50mV. The C/x
settings are adjusted by comparing the PROG pin voltage
with the values shows in Table 4. The default value for the
C/x setting is 00, giving 100mV detection.
The second byte of data at sub address 0x01 controls the
three battery charger safety timer bits, TIMER2-TIMER0,
the DISABLE_CHARGER bit, the ENABLE_BATTERY_
CONDITIONER bit, the V FLOAT = 4.2V control bit and the
T REG = 85°C control bit.
The TIMER2–TIMER0 bits control the duration of the bat-
tery charger safety timer. The safety timer starts once the
LTC4099 reaches the 4.100V or the 4.200V float voltage.
As long as input power is available, charging will con-
tinue in float voltage mode until the safety timer expires.
Table 3. I CHARGE2 – I CHARGE0 Decode
SUB ADDRESS 0
SUB ADDRESS 1
SUB ADDRESS 2
BATTERY CHARGER CURRENT LIMIT SETTINGS
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
COMMAND
REGISTER 0
I LIM2
I LIM1
I LIM0
I CHARGE2
I CHARGE1
I CHARGE0
COVERX1
COVERX0
COMMAND
REGISTER 1
TIMER2
TIMER1
TIMER0
DISABLE_CHARGER
ENABLE_ BATTERY_
CONDITIONER
V FLOAT = 4.2V
T REG = 85°C
Not Used
IRQ MASK
REGISTER
USBGOOD
WALLGOOD
BADCELL
THERMAL_ REG
THERMISTOR_
STATUS
CHARGER_STATUS
Not Used
Not Used
CHARGE CURRENT
I CHARGE2 I CHARGE1 I CHARGE0 V PROG R PROG = 1.02k
0 0 0 500mV* 500mA
0 0 1 600mV 600mA
0 1 0 700mV 700mA
0 1 1 800mV 800mA
1 0 0 900mV 900mA
1 0 1 1000mV 1000mA
1 1 0 1100mV 1100mA
1 1 1 1200mV 1200mA
*Default Setting
Table 4. C/x Decode
Table 2. I LIM2 – I LIM0 Decode
USB INPUT CURRENT LIMIT SETTINGS
I LIM2 I LIM1 I LIM0 I USB
0 0 0 100mA*
0 0 1 500mA
0 1 0 620mA
0 1 1 790mA
1 0 0 1000mA
1 0 1 1200mA
C/x INDICATION SETTINGS
FULL CAPACITY CHARGE
INDICATION
COVERX1 COVERX0 V PROG R PROG = 1.02k
0 0 100mV* 100mA*
0 1 50mV 50mA
1 0 200mV 200mA
1 1 500mV 500mA
*Default Setting
1
1
1
1
0
1
Suspend Low (500μA)
Suspend High (2.5mA)
*Default Setting
4099fd
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