9/25

XC6803

Series

■

OPERATIONAL EXPLANATION (Continued)

●

IC temperature monitoring function

In order to prevent destruction due to IC heat generation as well as abnormal charging due to thermal runaway, a thermal shutdown

circuit is incorporated into the IC. If the chip temperature rises to 140°C or higher and after 50ms elapses, the output driver is turned off and

charging is stopped. At this time, the charge status output pin repeats ON-OFF at 1kHz on the XC6803A, and turns off on the XC6803B.

When voltage is reapplied to the power input pin or the Li-ion battery is reconnected to the BAT pin, the IC starts up and charging begins.

●

Dropout voltage monitoring function

To prevent reverse current from the Li-ion battery to the battery charger, this function monitors the dropout voltage between the BAT pin

connection is changed from the power input pin to the BAT pin. After 50ms elapse, the charge status output pin repeats ON-OFF at 1kHz

on the XC6803A and turns off on the XC6803B. After charging is completed, the charge status output pin maintains the OFF state even if

the ouput driver turns ON, the driver backgate connects to the power pin and resumes charging, and the charge status output pin turns ON.

●

UVLO function

A UVLO function is incorporated. If the power input voltage, Vin falls to 3.8V or lower during charging, this function turns off the output

driver and stops charging. In addition, charge status output pin changes to off. When the Vin rises to 4V or higher, the IC starts up and

charging begins. This function also detects voltage application to the power input pin.

●

Charge over-voltage monitoring function

To prevent charging of a battery in the over-voltage state, charging is stopped after 50ms when the BAT pin voltage rises to 4.45V or

higher. At this time, the charge status output pin repeats ON-OFF at 1kHz on the XC6803A, and turns off on the XC6803B. When voltage is

reapplied to the power input pin or the Li ion battery is reconnected to the BAT pin, the IC starts up and charging begins.

●

Charge over-current monitoring function

To prevent charging of a battery by excessive current, this function stops charging if the charge current rises to 600mA or higher. At this

time, the charge status output pin repeats ON-OFF at 1kHz on the XC6803A, and turns off on the XC6803B. When voltage is reapplied to

the power input pin or the Li ion battery is reconnected to the BAT pin, the IC starts up and charging begins.

●

Recharge function

drops to 3.9V or less, the IC enters the charging start state (charging resumes 150ms after the charging start state).

than 60°C. This function only operates on the XC6803xxE, not on the XC6803xxD.