ACT2801 datasheet(12/25 Pages) ACTIVE-SEMI

12 / 25 page

Rev 9, 14-Mar-17

Innovative PowerTM

- 12 -

www.active-semi.com

ACT2801/ACT2801B/ACT2801C

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.

VEOC

FAST CHARGEB CURRENT

VPRECHARGE

PRECONDITION CHARGE CURRENT

STATE

RECHARGE

Current

Voltage

END-OF-CHARGE CURRENT

A: PRECONDITION STATE

B: FAST-CHARGE STATE

C: TOP-OFF STATE

D: END-OF-CHARGE STATE

Figure 3.

Typical Li+ Charge Profile and ACT2801/ACT2801B/ACT2801C Charge States

PRECONDITION

FAST CHARGE

DELAY

BATTERY PLACED AND (VIN > VBAT)

AND (VIN > UVLO) AND (VIN < VOVP)

AND VBAT ≤ 2.8V

VBAT > 2.8V (Typical)

VBAT = VEOC

TOP OFF

IBAT < IEOC

ANY STATE

END OF CHARGE

IBAT > IEOC

Figure 4.

Charger State Diagram

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