ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
FUNCTIONAL DESCRIPTION
End of Charge
When charges current decreases to 13% of set fast charge current, the buck converter goes into end of
charge mode and keep monitoring the battery voltage.
Recharge
When battery voltage drops by 200mV below the end of charge voltage, the charger is reinitiated with
constant current charge.
Figure 3.
Typical Li+ Charge Profile and ACT2801/ACT2801B/ACT2801C Charge States
VEOC
RECHARGE
FAST CHARGEB CURRENT
Current
A: PRECONDITION STATE
B: FAST-CHARGE STATE
Voltage
VPRECHARGE
C: TOP-OFF STATE
D: END-OF-CHARGE STATE
END-OF-CHARGE CURRENT
PRECONDITION CHARGE CURRENT
STATE
A
B
C
D
B
Figure 4.
Charger State Diagram
ANY STATE
BATTERY PLACED AND (VIN > VBAT
)
AND (VIN > UVLO) AND (VIN < VOVP
)
AND VBAT ≤ 2.8V
PRECONDITION
VBAT > 2.8V (Typical)
FAST CHARGE
VBAT = VEOC
IBAT > IEOC
TOP OFF
IBAT < IEOC
DELAY
END OF CHARGE
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