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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

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)