Datasheet

20 Maxim Integrated
1.2A Switch-Mode Li+ Chargers with ±22V Input
Rating and JEITA Battery Temperature Monitoring
MAX8900A/MAX8900B/MAX8900C
Figure 7. Charger State Diagram (3-Pin Status)
NO PWR OR
CHARGER DISABLED
STAT1 = HI-Z
STAT2 = HI-Z
STAT3 = HI-Z
I
BAT
= 0
ANY STATE
CEN = LOGIC-HIGH
OR T
J
> T
SHDN
V
IN
> V
UVLO
AND V
IN
> V
BAT
+ V
IN2BAT
AND T
J
< T
SHDN
(SET TIMER = 0)
V
BAT
< V
PQLTH
V
BAT
< V
DBAT
V
IN
< V
OVLO
TIMER = RESUME
V
IN
> V
OVLO
TIMER = SUSPEND
THERMISTOR < T1
TIMER = SUSPEND
THERMISTOR > T1
TIMER = RESUME
THERMISTOR > T4
TIMER = SUSPEND
THERMISTOR < T4
TIMER = RESUME
V
BAT
> V
DBAT
TIMER > t
PQ
TIMER > t
FC
TIMER > t
PQ
V
BAT
> V
PQLTH
V
BAT
< V
PQUTH
(SET TIMER = 0)
I
BAT
> I
DN
+ 1mA
(SET TIMER = 0)
I
BAT
< I
DN
V
BAT
> V
PQUTH
SOFT-START
(SET TIMER = 0)
V
BAT
< V
RSTRT
NO SOFT-START
(SET TIMER = 0)
TIMER > t
TO
V
IN
< V
UVLO
OR < V
BAT
+ V
IN2BAT
DEAD BAT +
PREQUAL
STAT1 = LOW
STAT2 = HI-Z
STAT3 = LOW
I
BAT
= I
DBAT +
I
PQ
PREQUAL
STAT1 = LOW
STAT2 = HI-Z
STAT3 = LOW
I
BAT
= I
PQ
FAST CHG
STAT1 = LOW
STAT2 = HI-Z
STAT3 = LOW
I
BAT
= I
FC
TOP-OFF
STAT1 = LOW
STAT2 = HI-Z
STAT3 = LOW
DONE
STAT1 = HI-Z
STAT2 = LOW
STAT3 = LOW
I
BAT
= 0
DEAD BAT
STAT1 = LOW
STAT2 = HI-Z
STAT3 = LOW
I
BAT
= I
DBAT
TIMER > t
PQ
TIMER FAULT
STAT1 = HI-Z
STAT2 = HI-Z
STAT3 = LOW
I
BAT
= 0
V
IN
TOO HIGH
STAT1 = LOW
STAT2 = LOW
STAT3 = HI-Z
I
BAT
= 0
ANY CHARGING STATE
(DEAD BAT, PREQUAL,
FAST CHG,
OR TOP-OFF)
BATTERY COLD
STAT1 = LOW
STAT2 = LOW
STAT3 = LOW
I
BAT
= 0 IF V
BAT
> V
DBAT
BATTERY HOT
STAT1 = LOW
STAT2 = HI-Z
STAT3 = HI-Z
I
BAT
= 0 IF V
BAT
> V
DBAT