BQ24600_1 Datasheet, PDF (10/31 Pages) Texas Instruments – Stand-Alone Synchronous Switch-Mode Li-Ion or Li-Polymer Battery Charger with Low Iq

bq24600
SLUS891 – FEBRUARY 2010
OPERATIONAL FLOWCHART
POR
VCC > SRN
No
Yes
Enable VREF LDO &
Chip Bias
SLEEP MODE
Indicate SLEEP
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Indicate battery
absent
No
Battery
present?
Initiate battery
detect algorithm
Yes
See Enabling and Disabling
Charge 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,
No
Suspend timers
Turn off charge,
Enable IDISCHG for 1
second
Yes
Indicate Charge In
Progress
Conditions met
for charge?
No
VFB > VRECH
&
ICHG < ITERM
Regulate
fastcharge current
Yes
Indicate Charge-
In-Progress
No
Fastcharge
Timer Expired?
VFB < VRECH
Charge Complete
No
Indicate DONE
No
Yes
FAULT
Enable IFAULT
Yes
Indicate FAULT
No
VFB > VRECH
Yes
Battery Removed
Yes
Indicate BATTERY
ABSENT
Figure 12. Operational Flowchart for bq24600
10
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