Datasheet

CHARGESUSPENDED CHARGESUSPENDED
TEMPERATURERANGE TO
INITIATECHARGE
TEMPERATURERANGE
DURING A CHARGECYCLE
V
HTF
GND
V
TCO
GND
VREF
VREF
CHARGESUSPENDED CHARGESUSPENDED
V
LTF
V
LTF
CHARGEatI /8
CHARGE
CHARGEat I /8
CHARGE
V
WARM
CHARGEat I /8
CHARGE
CHARGEat I /8
CHARGE
V
COOL
CHARGEat I
CHARGE
CHARGEat I
CHARGE
V
COOL
V
WARM
V
LTF_HYS
V
COOL_HYS
V
WARM_HYS
Temperature
Programmed
ChargeCurrent
1/8xProgrammed
ChargeCurrent
Charge
Current
Charge
Suspended
I
CHARGEG
/8
Charge
Chargeat I
CHG
I /8
CHARGE
Charge
Charge
Suspended
V
LTF
V
COOL
V
WARM
V
HTF
/V
TCO
(I )
CHARGE
(I /8)
CHARGE
bq24630
SLUS894A –JANUARY 2010– REVISED OCTOBER 2011 www.ti.com
within the V
LTF
to V
TCO
thresholds. If the battery temperature is outside of this range, the controller suspends
charge and the safety timer, and waits until the battery temperature is within the V
LTF
to V
HTF
range. If the battery
temperature is between the V
LTF
and V
COOL
thresholds or between the V
HTF
and V
WARM
thresholds, charge is
automatically reduced to I
CHARGE
/8. To avoid early termination during a COOL/WARM condition, set I
TERM
≤
I
CHARGE
/10. The controller suspends charge by turning off the PWM charge FETs. Figure 18 and Figure 19
summarize the operation.
Figure 18. TS, Thermistor Sense Thresholds
Figure 19. Typical Charge Current vs Temperature Profile
Assuming a 103AT NTC thermistor on the battery pack as shown in the Typical System Schematic, the value
RT1 and RT2 can be determined by using Equation 7 and Equation 8:
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