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XC6801 Datasheet(PDF) 5 Page - Torex Semiconductor |
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XC6801 Datasheet(HTML) 5 Page - Torex Semiconductor |
5 / 18 page 5/18 XC6801 Series ■OPERATIONAL DESCRIPTION <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 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 from 475mA(TYP.)or 95mA(TYP.)by the LIM pin. LIM ”H” level input:475mA(TYP.) LIM ”L” level input:95mA(TYP.) <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 sees that the ISEN pin voltage is less than 1.2ms (charge termination detect time), the IC enters stand-by mode. A driver transistor turns off during the stand-by mode. <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-start after a delay of 1.7ms. As such, no external activation control is needed. Failure Detection Input Voltage Monitor (UVLO) VIN-BAT Voltage Monitor (UVLO) Shut-Down Shut-Down Charge Cycle (Charge Main Routine) Trickle Charge Charge Cycle Charge Cycle Constant-Current Charge (CC) Constant-Voltage Charge (CV) Charge Termination (Stand-by mode) VLIM-“H” IBAT≦IBAT1/10 VLIM-“L” IBAT≦IBAT1/10 Maintaining the charge state during a charge termination detect time (1ms) Maintaining the stand-by mode during a recharge time (2ms) |
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