XC6806
Series
■OPERATIONAL EXPLANATION
<Charge Function>
Charge Start
Trickle Charge
0.5 hrs
Main Charge
5 hrs
V
BAT≧2.9V under 0.5 hrs
Abnormal Mode
Reset
V
BAT≦(VCV or VCVH) -0.1V
Charge Completion
Reset
VBAT=VCV or VCVH
and ＩBAT x 0.1mA or less
under 5 hrs
●Charge Start
When UVLO release (VUVLO) takes place due to power on, and when battery connection is detected (VTD) due to insertion of the
lithium ion battery, charge starts after 20 ms elapses.If the power is not on or the battery is not inserted, charge will not start. If
the system load current is 450mA or higher, the input current limit (IINL) activates and charge of the lithium ion battery does not
start. When the load current is less than 450mA, charge starts.
●Tricle Charge：0.5 hour
If the BAT pin voltage has not reached 2.9V(VTRK), the lithium ion battery is charged at a current that is 1/10 the main charge
current. If the BAT pin voltage rises to 2.9V(VTRK) within 0.5 hours (tTRK), the IC transitions to main charge after 4ms. During trickle
charge, the CSO pin output is ON. If the BAT pin voltage does not reach 2.9V(VTRK) after 0.5 hours (tTRK), the IC transitions to
the abnomal mode and charge stops.
●Main Charge：5 hours
When the condition for charge from trickle charge to main charge is satisfied, the lithium ion battery is charged at the charge
current set with the external resistance (RSET) connected to the ISET pin.During main charging, the CSO pin output is ON. If the
BAT pin voltage rises to the charge voltage (VCV or VCVH) within 5 hours (tCHG) and the charge current drops to the charge
completion current, which is 1/10 the charge current set with the external resistor (RSET), the IC transitions to the charge completion
after 4ms and charge stops. If the charge current is still higher than the charge completion current after 5 hours (tCHG), the IC
transitions to the abnomal mode and charge stops.
The main charge current can be set to a value from 10mA(IBATL) to 385mA(IBATM) using an external resistor (RSET). The charge
current value (IBAT) set with RSET is approximated by the following equation.
RSET (kΩ) = 421 x IBAT-1.08 (mA)
●Charge Completion
When the condition for transition from main charge to charge completion is satisfied, charge of the lithium ion battery stops and
the CSO pin output turns OFF. Reset takes place when the power is turned off-on or the lithium ion battery is reinserted.
●Recharge Function
When the BAT pin voltage drops from the charge voltage (VCV or VCVH) to 0.1V (VRC) after charge complettion, charge
automatically resumes after 8ms elapses.
●Abnormal Mode
If trickle charge continues for 0.5 hours (tTRK), or main charge continues for 5 hours (tCHG), an abnormal is detected and charge
stops. When an abnoemal mode, the CSO pin output oscillates at 1 kHz.Reset takes place when the power is turned off-on or the
lithium ion battery is reinserted.
7/20
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