Datasheet

MAX8677C
1.5A Dual-Input USB/AC Adapter Charger
and Smart Power Selector
16 ______________________________________________________________________________________
ANY STATE
TIMER > t
FSTCHG
(TIMER SLOWED BY 2X IF
I
CHG
< I
CHGMAX
/2, AND
PAUSED IF I
CHG
< I
CHGMAX
/5
WHILE BAT < 4.2V)
TIMER > 15s
UOK OR DOK = LOW
CEN = 0
RESET TIMER
TIMER > t
PREQUAL
NOT READY
UOK AND DOK = HIGH IMPEDANCE
CHG = HIGH IMPEDANCE
FLT = HIGH IMPEDANCE
PREQ = HIGH IMPEDANCE
I
CHG
= 0mA
PREQUAL
UOK OR DOK = LOW
CHG = LOW
FLT = HIGH IMPEDANCE
PREQ = LOW
0V ≤ V
BATT
≤ 3V
I
CHG
= I
CHGMAX
/10
FAST CHARGE
UOK OR DOK = LOW
CHG = LOW
FLT = HIGH IMPEDANCE
PREQ = HIGH IMPEDANCE
3V < V
BATT
< 4.2V
I
CHG
≤ I
CHGMAX
FAULT
UOK OR DOK = LOW
CHG = HIGH IMPEDANCE
FLT = LOW
PREQ = PREVIOUS STATE
I
CHG
= 0mA
TOP-OFF
UOK OR DOK = LOW
CHG = HIGH IMPEDANCE
FLT = HIGH IMPEDANCE
PREQ = HIGH IMPEDANCE
BATT = 4.2V
I
CHG
< I
TERM
DONE
UOK OR DOK = 0V
CHG = HIGH IMPEDANCE
FLT = HIGH IMPEDANCE
PREQ = HIGH IMPEDANCE
4.1 < V
BATT
< 4.2V
I
CHG
= 0mA
CEN = HI
OR
REMOVE AND RECONNECT
THE INPUT SOURCE(S).
V
BATT
> 3V,
RESET TIMER
V
BAT
< 4.1V
RESET TIMER
V
BATT
< 2.82V,
RESET TIMER
ANY CHARGING
STATE
THM NOT OK
TIMER SUSPEND
THM OK
TIMER RESUME
TEMPERATURE
SUSPEND
I
CHG
= 0mA
UOK OR DOK = PREVIOUS STATE
CHG = HIGH IMPEDANCE
FLT = HIGH IMPEDANCE
PREQ = PREVIOUS STATE
I
CHG
< I
TERM
AND V
BAT
= 4.2V
AND THERMAL
OR INPUT LIMIT
NOT EXCEEDED.
RESET TIMER.
I
CHG
> I
TERM
RESET TIMER
V
BATT
< 2.8V
RESET TIMER
TOGGLE CEN
OR
REMOVE AND RECONNECT
THE INPUT SOURCE(S).
Figure 5. MAX8677C Charger State Flowchart