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ꢀ ꢁꢂ ꢃ ꢄ ꢂ ꢇ ꢅ ꢀꢁ ꢂꢃ ꢄꢂ ꢈ
SLUS549C − DECEMBER 2002 − REVISED AUGUST 2004
POR
SLEEP MODE
Vcc > V
I(OUT)
No
checked at all times
Indicate SLEEP
MODE
Yes
Regulate
IO(PRECHG)
Reset and Start
(PRECHG)timer
VI(OUT)<V(LOWV)
Yes
t
Indicate Charge−
In−Progress
No
Reset all timers,
Start t(CHG)timer
Regulate Current
or Voltage
Indicate Charge−
In−Progress
No
VI(OUT)<V
(LOWV)
Yes
Yes
t(PRECHG)
Expired?
No
t(CHG)Expired?
Yes
No
Yes
Fault Condition
Indicate Fault
Yes
VI(OUT)<V(LOWV)
No
I(TERM)
detection?
V
I(OUT) > V
?
(RCH)
Yes
No
No
No
t(TAPER)
Expired?
(1)
Enable I(FAULT)
current
I(TAPER)
detection?
Yes
No
No
Yes
V
I(OUT) > V
?
(RCH)
Yes
Turn off charge
Indicate DONE
Yes
Yes
Disable (IFAULT)
current
No
VI(OUT) < V
?
(RCH)
(1)
t
does not apply to bq24026
(TAPER)
Figure 4. Operational Flow Chart
11
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