Datasheet

4.0V<V <6.0V
CC
Charge
Initialization
BatteryVoltage(VoltageatBAT pin
checkedcontinuously.PVDchecked
atrateofMTO/128.)
Sleep
Mode
V <V
BAT SLP
V <
MCV
V <V
BAT SLP
Charge
Qualification
State
V <V
BAT MCV
Battery Temperature
(Temperatureat TSpinchecked
continuously)
V Reset
or
BatteryReplacementatanytime
CC
Charge
Suspended
V >V
TS HTF
V <V
TS HTF
Battery
Conditioning
Current
Regulation
V <V
BAT LBAT
or
V >V
TS LTF
V <V
TS HTF
V >V
TS LTF
V V
V <V
LBAT BAT
HTF TS LTF
< and
<V
V <V <V and
V <V <V
LBAT BAT MCV
HTF TS LTF
PVD(afterhold-offperiod),
orV <V or
Time=MTO
TS TCO
Top-Off
Selected?
Trickle
Maintenance
Charge
NO
YES
Top-Off
V >V
TS LTF
V <V
TS LTF
and
Time<MTO
Time=MTO
Done
V V
BAT MCV
≥
V V
BAT MCV
≥
Charge
Suspended
(SeeNote)
V <V
TS HTF
V >V
TS HTF
and Time<MTO
V <V
TS HTF
V >V
TS HTF
V ResetorBatteryReplacement
CC
Fast Charge State
V <
SLP
V <V
BAT CC
bq24400
SLUS498A –SEPTEMBER 2001–REVISED FEBRUARY 2010 www.ti.com
NOTE: If V
TS
< V
TCO
at any time, may only return to Trickle Maintenance Charge state and not to Top-Off.
Figure 2. State Diagram
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