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XC6805
Series
■OPERATIONAL EXPLANATION
<Charge Function>
XC6805xxE
V
BAT
≥ 2.9V under 0.5 hrs
Charge Start
Trickle Charge：
0.5 hrs
Main Charge：
5 hrs
Completed Charge
I
BAT
≤ C x 0.1mA under 5 hrs
Re-attached Battery or Re-input Power Supply
or V
BAT
≤
3.9V
(*1)
Abnormal Mode
Re-attached Battery or Re-input Power Supply
V
BAT
＜ 2.9V under 5 hrs
XC6805xxD
Charge Start
Main Charge：
5 hrs
Completed Charge
I
BAT
≤ C x 0.1mA under 5 hrs
Re-attached Battery or Re-input Power Supply
or V
BAT
≤ 3.9V
Abnormal Mode
Re-attached Battery or Re-input Power Supply
●Charging start
When a thermistor is connected to the THIN pin after a voltage is applied to the power input pin (①), or when a voltage is applied to the power
input pin after a thermistor is connected to the THIN pin (②), the power on reset function activates and initializes the internal counter. After
200ms elapses in the case of ①, or 150ms in the case of ②, charging starts.
●Trickle charging: Less than 0.5 hour (XC6805xxE only)
Trickle charging determines if main charging of the Li-ion battery is possible. The Li-ion battery is charged at a trickle charge current that is
one-tenth the charge current set with the external resistor R
ISET
. If the BAT pin voltage V
BAT
is above 2.9V in the charging start state, trickle
charging takes place for 1ms and then main charging begins. If V
BAT
is less than 2.9V, trickle charging takes place, and main charging begins
50ms after 2.9V is detected. If the BAT pin voltage is less than 2.9V after 0.5 hours, the IC changes to the error state and stops charging the
Li ion battery. In addition, the error in the trickle charge current increases if V
BAT
drops below about 1V.
●Main charging: Less than 5 hours
When the condition for transition from trickle charging is satisfied, it is determined that rapid charging of the Li-ion battery is possible and the
IC changes to the main charging state. In main charging, the IC charges an Li-ion battery at a CC charge current that is set with the external
resistor R
ISET
. If the BAT pin voltage V
BAT
rises to the CV charge voltage V
BAC
within 5 hours, the charge current drops to the charge completed
current, and after 50ms elapses, the state changes to charge completed and charging stops.If the charge current is higher than the charge
completed current after 5 hours, an error state occurs and charging stops.
●Charging completed
When the charge current reaches the charge completion current, which is one-tenth the charge current set with the external resistor R
ISET
,
and after 50ms elapses, the IC changes to charging completed and stops charging the Li-ion battery. At this time, the charge status output pin
changes from ON to OFF. When the BAT pin voltage (V
BAT
) falls from the charge completion state to the recharge voltage V
RCHG
or less,
charging automatically restarts. When a voltage is reapplied to the power input pin or a Li-ion battery is reconnected to the BAT pin in the
charging completed state, the IC starts up and charging begins.
