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参数资料
| 型号： | LTC4085EDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 14-DFN |
| 标准包装： | 91 |
| 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： | 管件 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
LTC4085
OPERATION
I CHG = ( I PROG ) ? 50,000 =
V PROG
Programming Charge Current
The formula for the battery charge current is:
? 50,000
R PROG
where V PROG is the PROG pin voltage and R PROG is the
total resistance from the PROG pin to ground. Keep in
mind that when the LTC4085 is powered from the IN pin,
the programmed input current limit takes precedent over
the charge current. In such a scenario, the charge current
cannot exceed the programmed input current limit.
For example, if typical 500mA charge current is required,
calculate:
is prevented. If after power-up the battery voltage drops
below the recharge threshold or if after a charge cycle the
battery voltage is still below the recharge threshold the
charge time is set to one half of a full cycle.
The LTC4085 has a feature that extends charge time au-
tomatically. Charge time is extended if the charge current
in constant-current mode is reduced due to load current
or thermal regulation. This change in charge time is in-
versely proportional to the change in charge current. As
the LTC4085 approaches constant-voltage mode the charge
current begins to drop. This change in charge current is
due to normal charging operation and does not affect the
timer duration.
Once a time-out occurs and the voltage on the battery is
R PROG = ?
? 1V ?
? 500mA ? ?
? 50,000 = 100k
greater than the recharge threshold, the charge current
stops, and the CHRG output assumes a high impedance
state if it has not already done so.
t TIMER (Hours) =
Forbeststabilityovertemperatureandtime,1%metalfilm
resistors are recommended. Under trickle charge condi-
tions, this current is reduced to 10% of the full-scale value.
The Charge Timer
The programmable charge timer is used to terminate the
charge cycle. The timer duration is programmed by an
external capacitor at the TIMER pin. The charge time is
typically:
C TIMER ? R PROG ? 3Hours
0.1μF ? 100k
The timer starts when an input voltage greater than the
undervoltage lockout threshold level is applied or when
leaving shutdown and the voltage on the battery is less than
Connecting the TIMER pin to ground disables the battery
charger.
CHRG Status Output Pin
When the charge cycle starts, the CHRG pin is pulled to
ground by an internal N-channel MOSFET capable of driving
an LED. When the charge current drops below 10% of the
programmed full charge current while in constant-voltage
mode, the pin assumes a high impedance state (but charge
current continues to flow until the charge time elapses).
If this state is not reached before the end of the program-
mable charge time, the pin will assume a high impedance
state when a time-out occurs. The CHRG current detection
threshold can be calculated by the following equation:
the recharge threshold. At power up or exiting shutdown
with the battery voltage less than the recharge threshold
the charge time is a full cycle. If the battery is greater than
I DETECT =
0.1V
R PROG
? 50,000 =
5000V
R PROG
the recharge threshold the timer will not start and charging
4085fd
17
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相关代理商/技术参数 |
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|---|---|
| LTC4085EDE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:USB Power Manager with Ideal Diode Controller and Li-Ion Charger |
| LTC4088 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency Battery Charger/USB Power Manager |
| LTC4088_12 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Efficiency Battery Charger/USB Power Manager |
| LTC4088-1 | 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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