参数资料
| 型号： | LTC4085EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 14-DFN |
| 标准包装： | 2,500 |
| 功能： | 电源管理 |
| 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： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN-EP（4x3） |
| 包装： | 带卷 (TR) |
LTC4085
OPERATION
USB Current Limit and Charge Current Control
The current limit and charger control circuits of the
LTC4085 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 defined as:
The current limiting circuitry in the LTC4085 can and should
be configured to limit current to 500mA for USB applica-
tions (selectable using the HPWR pin and programmed
using the CLPROG pin).
The LTC4085 reduces battery charge current such that the
I CL = ?
? V CLPROG ? =
? 1000
? R CLPROG
?
?
1000V
R CLPROG
sum of the battery charge current and the load current
does not exceed the programmed input current limit (one-
fifth of the programmed input current limit when HPWR
is low, see Figure 2). The battery charge current goes to
The programmed battery charge current, I CHG , is defined as:
zero when load current exceeds the programmed input
I CHG = ?
? V PROG ? =
? 50,000
? R PROG
?
?
50,000V
R PROG
current limit (one-fifth of the limit 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
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 ideal diode circuit will take over and the excess load
current will be drawn from the battery.
600
120
600
500
I IN
100
I IN
500
I IN
400
I LOAD
80
I LOAD
400
I LOAD
300
60
300
I BAT = I CHG
200
I BAT
CHARGING
40
I BAT
CHARGING
200
I BAT
I BAT = I CL – I OUT
100
0
20
0
100
0
CHARGING
–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)
4085 F02a
(2a) High Power Mode/Full Charge
R PROG = 100k and R CLPROG = 2k
4085 F02b
(2b) Low Power Mode/Full Charge
R PROG = 100k and R CLPROG = 2k
4085 F02c
(2c) High Power Mode with
I CL = 500mA and I CHG = 250mA
R PROG = 100k and R CLPROG = 2k
Figure 2: Input and Battery Currents as a Function of Load Current
4085fd
14
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相关代理商/技术参数 |
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| LTC4088 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency Battery Charger/USB Power Manager |
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| LTC4088-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency Battery Charger/USB Power Manager with Regulated Output Voltage |
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