Datasheet

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OUT
ISET
IN
BATTERY
SWITCH
SystemVoltage
RegulationLoop
I /K
(BAT) (SET)
Thermal
Loop
VTJ
VREF
V
O(REG)
I
(BAT)
V
(BAT)
BAT
PRE-CHARGE
CURRENT AND
TERMINATION
THRESHOLD
FAST-CHARGE
CURRENT
T
(PRECHG)
Charge
Complete
Status,
Charger
Off
Pre-
Conditioning
Phase
Current
Regulation
Phase
VoltageRegulationand
ChargeTermination
Phase
Battery
Voltage,
V
(BAT)
BatteryCurrent,
I
(BAT)
DONE
Thermal
Regulation
Phase
temperature , Tj
I
O(OUT)
T
(THREG)
I I
O(PRECHG), (TERM)
V
O(REG)
V
O(LOWV)
DONE
T
(CHG)
bq2406x
SLUS689A – JUNE 2006 – REVISED OCTOBER 2006
Figure 14. Thermal Regulation Circuit
A modified charge cycle, with the thermal loop active, is shown in Figure 15 .
Figure 15. Charge Profile, Thermal Loop Active
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