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参数资料
| 型号： | LTC4055EUF |
| 厂商： | Linear Technology |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC USB PWR MNGR BATT CHRGR 16QFN |
| 标准包装： | 91 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 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： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN（4x4） |
| 包装： | 管件 |
LTC4055/LTC4055-1
OPERATION
I CL = ?? ? V CLPROG ?? =
I CHG = ?? ? V PROG ?? =
V CLPROG
USB CURRENT LIMIT AND CHARGE CURRENT
CONTROL
The current limit and charger control circuits of the
LTC4055/LTC4055-1 are designed to limit input current
as well as control battery charge current as a function of
I OUT . The programmed current limit, I CL is de?ned as:
? 49 , 000 ? 49, 000 V
? R CLPROG ? R C L PROG
The programmed battery charge current, I CHG , is de?ned as:
? 48, 500 ? 48, 500 V
? R PROG ? R PROG
Input current, I IN , is equal to the sum of the BAT pin output
current and the OUT pin output current.
I IN = I OUT + I BAT
The current limiting circuitry in the LTC4055/LTC4055-1
can and should be con?gured to limit current to 500mA
for USB applications (selectable using the HPWR pin and
programmed using the CLPROG pin).
When programmed for 500mA current limit and 500mA
or more of charging current, powered from IN1/IN2
and battery charging is active, control circuitry within
the LTC4055/LTC4055-1 reduces the battery charging
current such that the sum of the battery charge current
and the load current does not exceed 500mA (100mA
when HPWR is low, see Figure 2) The battery charging
current goes to zero when load current exceeds 500mA
(80mA when HPWR is low). If the load current is greater
than the current limit, the output voltage will drop to just
under the battery voltage where the ideal diode circuit will
take over and the excess load current will be drawn from
the battery (shaded region in Figure 2).
PROGRAMMING CURRENT LIMIT
The formula for programming current limit is:
I CL = I CLPROG ? 49 , 000 = ? 49 , 000
R CLPROG
where V CLPROG is the CLPROG pin voltage and R CLPROG is
the total resistance from the CLPROG pin to ground.
For example, if typical 490mA current limit is required,
calculate:
1 V
R CLPROG = ? 49 , 000 = 100 k
490 mA
In USB applications, the minimum value for R CLPROG should
be 105k. This will prevent the application current from
600
120
600
500
I IN
100
500
400
80
I IN
400
I IN
300
200
100
I LOAD
I BAT
CHARGING
60
40
20
I LOAD
I BAT
CHARGING
300
200
100
I BAT = I CHG
I BAT
CHARGING
I LOAD
I BAT = I CL – I OUT
0
0
0
–100
0
100
200
300
I LOAD (mA)
400
500 600
I BAT
(IDEAL DIODE)
–20
0
20
40
60
I LOAD (mA)
80
100 120
I BAT
(IDEAL DIODE)
–100
0
100
200
300
I LOAD (mA)
400
500 600
I BAT
(IDEAL DIODE)
4055 F02a
(2a) High Power Mode/Full Charge
(R PROG = R CLPROG = 97.6k)
4055 F02b
(2b) Low Power Mode/Full Charge
(R PROG = R CLPROG = 97.6k)
4055 F02c
(2c) High Power Mode with
I CL = 500mA and I CHG = 250mA
(R PROG = 196k, R CLPROG = 97.6k)
Figure 2. Input and Battery Currents as a Function of Load Current
4055fb
14
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4055EUF#PBF | 功能描述:IC USB PWR MNGR BATT CHRGR 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
| LTC4055EUF#TR | 功能描述:IC USB PWR MNGR BATT CHRGR 16QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 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:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4055EUF#TRPBF | 功能描述:IC USB PWR MNGR BATT CHRGR 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 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:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4055EUF-1#PBF | 功能描述:IC USB PWR MNGR BATT CHRGR 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 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:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC4055EUF-1#TRPBF | 功能描述:IC USB PWR MNGR BATT CHRGR 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 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:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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