XC6802A42X1EL 查看數據表（PDF） - TOREX SEMICONDUCTOR

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XC6802A42X1EL

1 Cell Li-ion Battery Linear Charger IC with Constant-Current/Constant-Voltage

TOREX SEMICONDUCTOR 

■OPERATIONAL EXPLANATION

XC6802

Series

<Charge Cycle>

If the BAT pin voltage is less than 2.9V, the charger enters trickle charge mode. In this mode, a safe battery charge is possible

because approximately only 1/10 of the charge current which was set by the ISEN pin, is supplied to the battery. When the BAT

pin voltage rises above 2.9V, the charger enters constant-current mode (CC mode) and the battery is charged by the

programmed charge current. When the BAT pin voltage reaches 4.2V, the charger enters constant-voltage mode (CV mode)

automatically. After this, the charge current starts to drop and when it reaches a level which is 1/10 of the programmed charge

current, the charge terminates.

<Setting Charge Current>

The charge current can be set by connecting a resistor between the ISEN pin and the VSS pin. The battery charge current, IBAT,

is 1000 times the current out of the ISEN pin. Therefore, the charge current, IBAT, is calculated by the following equations:

IBAT = (VISEN / RSEN) x 1000 (VISEN = 1.0V: Current sense pin voltage)

However IBAT≦800mA

<Charge Termination>

The battery charge is terminated when the charge current decreases to 1/10 of the full charging level after the battery pin

voltage reaches a float voltage. An internal comparator monitors the ISEN pin voltage to detect the charge termination. When

the comparator monitors the ISEN pin voltage is less than 100mV (charge termination detect) for 1ms (charge termination detect

time), the IC enters stand-by mode. A driver transistor turns off during the stand-by mode. In this state, a failure detection

circuit and a monitoring circuit of the battery pin voltage operates and supply current is reduced to 10μA.

<Automatic Recharge>

In stand-by mode battery voltage falls. When the voltage level at the battery pin drops to 4.05V or less, the charge cycle

automatically re-starts after a delay of 2ms. As such, no external activation control is needed.

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