BQ24630 Datasheet, PDF (13/33 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with System Power Selector and Low Iq

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OPERATIONAL FLOWCHART
POR
Turn on
BATDRV FET
VCC > SRN
SLEEP MODE
No
Indicate SLEEP
Yes
Enable VREF LDO&
Chip Bias
30 ms delay
Turn off BATFET
Turn on ACFET
bq24630
SLUS894 – JANUARY 2010
Indicate battery
absent
No
Battery
present?
Initiate battery
detect algorithm
Yes
See Enabling and Disabling
Charg e Section
Conditions met
for charge?
No
Yes
VFB < VLOWV
Yes
Indicate NOT
CHARGING,
Suspend timers
No
Conditions met
for charge?
Start 30 minute
precharge timer
Yes
Regulate
precharge current
Indicate Charge-
In-Progress
No
VFB < VLOWV Yes
Precharge
timer expired?
No
Start Fastcharge
timer
Indicate NOT
CHARGING,
Suspend timers
Regulate
fastcharge current
No
Conditions met
for charge?
Yes
Indicate Charge-
In-Progress
Turn off charge,
Enable I DISCHG for1
second
Yes
Indicate Charge In
Progress
No
VFB > VRECH
&
ICHG < ITERM
No
Fastcharge
Timer Expired?
No
Yes
Yes
FAULT
Enable I FAULT
Indicate FAULT
VFB < VRECH
Charge Complete
No
Indicate DONE
No VFB > VRECH
Yes
Battery Removed
Yes
Indicate BATTERY
ABSENT
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