参数资料
| 型号： | LTC4085EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/24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
PIN FUNCTIONS
I CL (A) =
t TIMER (Hours) =
IN (Pin 1): Input Supply. Connect to USB supply, V BUS .
Input current to this pin is limited to either 20% or 100%
of the current programmed by the CLPROG pin as deter-
mined by the state of the HPWR pin. Charge current (to
BAT pin) supplied through the input is set to the current
programmed by the PROG pin but will be limited by the
input current limit if charge current is set greater than the
input current limit.
OUT (Pin 2): Voltage Output. This pin is used to provide
controlled power to a USB device from either USB V BUS
(IN) or the battery (BAT) when the USB is not present. This
pin can also be used as an input for battery charging when
the USB is not present and a wall adapter is applied to this
pin. OUT should be bypassed with at least 4.7μF to GND.
CLPROG (Pin 3): Current Limit Program and Input Cur-
rent Monitor. Connecting a resistor, R CLPROG , to ground
programs the input to output current limit. The current
limit is programmed as follows:
1000V
R CLPROG
In USB applications the resistor R CLPROG should be set
to no less than 2.1k.
The voltage on the CLPROG pin is always proportional to
the current flowing through the IN to OUT power path.
This current can be calculated as follows:
HPWR (Pin 4): High Power Select. This logic input is used
to control the input current limit. A voltage greater than
1.2V on the pin will set the input current limit to 100% of
the current programmed by the CLPROG pin. A voltage
less than 0.4V on the pin will set the input current limit to
20% of the current programmed by the CLPROG pin. A 2μA
pull-down is internally applied to this pin to ensure it is low
at power up when the pin is not being driven externally.
SUSP (Pin 5): Suspend Mode Input. Pulling this pin above
1.2V will disable the power path from IN to OUT. The sup-
ply current from IN will be reduced to comply with the
USB specification for suspend mode. Both the ability to
charge the battery from OUT and the ideal diode function
(from BAT to OUT) will remain active. Suspend mode will
reset the charge timer if V OUT is less than V BAT while in
suspend mode. If V OUT is kept greater than V BAT , such as
when a wall adapter is present, the charge timer will not
be reset when the part is put in suspend. A 2μA pull-down
is internally applied to this pin to ensure it is low at power
up when the pin is not being driven externally.
TIMER (Pin 6): Timer Capacitor. Placing a capacitor, C TIMER ,
to GND sets the timer period. The timer period is:
C TIMER ? R PROG ? 3Hours
0.1 μ F ? 100k
Charge time is increased if charge current is reduced
due to undervoltage current limit, load current, thermal
I IN (A) =
V CLPROG
R CLPROG
? 1000
regulation and current limit selection (HPWR).
Shorting the TIMER pin to GND disables the battery charg-
ing functions.
4085fd
8
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