BQ24620 Datasheet, PDF (13/30 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Lithium Phosphate Battery Charger with Low Iq

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OPERATIONAL FLOWCHART
POR
bq24620
SLUS893 – MARCH 2010
VCC > SRN
SLEEP MODE
No
Indicate SLEEP
Yes
Enable VREF LDO &
Chip Bias
Indicate battery
absent
No
Battery
present?
Initiate battery
detect algorithm
See Enabling and
Disabling Charge Section
Yes
Conditions met
No
for charge?
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 ^,
No
Suspend timers
Turn off charge ,
Enable IDISCHG for1
second
Yes
Indicate Charge In
Progress
Conditions met
for charge?
No
VFB > VRECH
&
ICHG < ITERM
Regulate
fastcharge current
Yes
Indicate Charge -
In-Progress
Fastcharge
No _{Timer Expired ?}
No
Yes
Yes
FAULT
Enable IFAULT
Indicate FAULT
VFB < VRECH
Charge Complete
No
Indicate DONE
No VFB > VRECH
Yes
Battery Removed
Yes
Indicate BATTERY
ABSENT
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