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| BQ24020 Datasheet, PDF (11/20 Pages) Texas Instruments – SINGLE-CHIP,LI-ION AND LI-POL CHARGER IC WITH AUTONOMOUS USB-PORT AND AC-ADAPTER SUPPLY MANAGEMENT | |||
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bq24020, bq24022, bq24023
bq24024, bq24025, bq24026
bq24027
SLUS549D â DECEMBER 2002 â REVISED MARCH 2006
FUNCTIONAL DESCRIPTION (continued)
POR
Vcc > VI(OUT)
checked at all times
Yes
SLEEP MODE
No
Indicate SLEEP
MODE
VI(OUT<) V(LOWV)
Yes
Reset and Start
t (PRECHG) timer
No
Reset all timers,
Start t (CHG) timer
Regulate Current
or Voltage
Indicate Charge-
In-Progress
No
Regulate
IO(PRECHG)
Indicate Charge-
In-Progress
VI(OUT<) V(LOWV)
Yes
Yes
t (CHG)Expired?
No
VI(OUT) <V(LOWV)
Yes
No
I(TERM)
detection?
No
Yes
No
t(TAPER)
Expired?
(1)
I(TAPER)
detection?
Yes
No
Yes
Yes
Turn off charge
Yes
Indicate DONE
No
Yes
t(PRECHG)
Expired?
Yes
Fault Condition
Indicate Fault
VI(OUT)> V(RCH)?
No
Enable I(FAULT)
current
VI(OUT) > V(RCH)?
Yes
Disable I(FAULT)
current
No
No
VI(OUT) < V(RCH)
?
(1) t(TAPER) does not apply to bq24026/7
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