Datasheet

4
Chip On
V
CC
4.5V
Temperature
Checks On
Battery
Status?
Temperature
in Range
Temperature Out
of Range or
Thermistor Absent
Qualification Test
Current
Regulation
@ I
COND
Phase 2
V = V
REG
Fault
LED3 =1
MOD = 0
Charge
Complete
Charge
Pending
LED3 flash
MOD = 0
Phase 1
I = I
MAX
Temperature Out
of Range or
Thermistor Absent
Temperature In
Range, Return
to Original State
V
BAT
< V
LCO
or
V
BAT
> V
HCO
t t > t
MTO
or
V
BAT
< V
LCO
or
V
BAT
> V
HCO
Fail: t = t
QT
or
V
BAT
< V
LCO
V
BAT
> V
HCO
Present
V
LCO
< V
BAT
< V
HCO
V
BAT
< V
MIN
PASS: V
BAT
V
MIN
V
BAT
< V
REG
V
BAT
V
REG
Fast
Charge
I
SNS
> I
MIN
I
SNS
I
MIN
or
t t
MTO
FG205401.eps
Absent
V
BAT
< V
LCO
or
V
BAT
> V
HCO
>
>
<
>
>
V
BAT
V
LCO
or
V
BAT
V
HCO
V
BAT
V
LCO
or
V
BAT
V
HCO
Figure 2. bq2054 State Diagram
bq2054