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参数资料
| 型号： | LTC4098EUDC#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 2650 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 4 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 10/32页 |
| 文件大小： | 443K |
| 代理商： | LTC4098EUDC#PBF |
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LTC4098/LTC4098-1
18
40981fc
Charge Termination
The battery charger has a built-in safety timer. Once the
voltage on the battery reaches the preprogrammed float
voltage of 4.200V for the LTC4098 or 4.100V for the
LTC4098-1, the charger will regulate the battery voltage
there and the charge current will decrease naturally. Once
the charger detects that the battery has reached 4.200V
or 4.100V respectively, the 4-hour safety timer is started.
After the safety timer expires, charging of the battery will
discontinue and no more current will be delivered.
Automatic Recharge
Once the battery charger terminates, it will remain off
drawing only microamperes of current from the battery.
If the portable product remains in this state long enough,
the battery will eventually self discharge. To ensure that
the battery is always topped off, a charge cycle will au-
tomatically begin when the battery voltage falls below
VRECHRG (typically 4.1V for the LTC4098 and 4.0V for the
LTC4098-1). In the event that the safety timer is running
when the battery voltage falls below VRECHRG, it will reset
back to zero. To prevent brief excursions below VRECHRG
from resetting the safety timer, the battery voltage must
be below VRECHRG for more than 1.5ms. The charge
cycle and safety timer will also restart if the VBUS UVLO
cycles low and then high (e.g., VBUS is removed and then
replaced) or if the charger is momentarily disabled using
the D2 pin.
Charge Current
The charge current is programmed using a single resistor
from PROG to ground. 1/1030th of the battery charge cur-
rent is delivered to PROG, which will attempt to servo to
1.000V. Thus, the battery charge current will try to reach
1030 times the current in the PROG pin. The program
resistor and the charge current are calculated using the
following equations:
RPROG =
1030V
ICHG
, ICHG =
1030V
RPROG
In either the constant-current or constant-voltage charging
modes, the voltage at the PROG pin will be proportional
to the actual charge current delivered to the battery. The
charge current can be determined at any time by monitoring
the PROG pin voltage and using the following equation:
IBAT =
VPROG
RPROG
1030
In many cases, the actual battery charge current, IBAT, will
be lower than the programmed current, ICHG, due to limited
input power available and prioritization to the system load
drawn from VOUT.
Charge Status Indication
The CHRG pin indicates the status of the battery charger.
Four possible states are represented by CHRG which include
charging, not charging (or float charge current less than
programmed end of charge indication current), unrespon-
sive battery and battery temperature out of range.
The signal at the CHRG pin can be easily recognized as
one of the above four states by either a human or a mi-
croprocessor. An open-drain output, the CHRG pin can
drive an indicator LED through a current limiting resistor
for human interfacing or simply a pull-up resistor for
microprocessor interfacing.
OPERATION
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