BQ24130_15 Datasheet, PDF (17/29 Pages) Texas Instruments – 600-kHz Synchronous Switch-Mode Host-ControlledBattery/Supercapacitor Charger With 4-A Integrated MOSFETs

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VREF
V_(LTF)
V_(LTFH)
TEMPERATURE RANGE
TO INITIATE CHARGE
CHARGE SUSPENDED
CHARGE at full C
bq24130
SLUSAN2C – JULY 2011 – REVISED JUNE 2012
TEMPERATURE RANGE
DURING A CHARGE CYCLE
CHARGE SUSPENDED
VREF
V_(LTF)
V_(LTFH)
CHARGE at full C
V_(HTF)
AGND
CHARGE SUSPENDED
CHARGE SUSPENDED
Figure 16. TS pin, Thermistor Sense Thresholds
V_(TCO)
AGND
Assuming a 103AT NTC thermistor on the battery pack as shown in Figure 1, the value RT1 and RT2 can be
determined by using Equation 4 and Equation 4:
RT2
=
V_{( VREF)}
´RTH_(COLD)
´RTH_{(HOT )}
´æççççè
1
V_(LTF)
-
1
V_{( TCO )}
÷÷÷÷öø
RTH_(HOT
)
´ççèæçç
V_{( VREF)}
V_{( TCO )}
-
1_{÷÷÷÷øö}
-
RTH₍
COLD
)
´ççççèæ
V_{( VREF}
V_(LTF)
)
-1_{øö÷÷÷÷}
(3)
SPACER
V_{(VREF) -1}
RT1=
V_(LTF)
1
1
+
RT2 RTH_(COLD)
(4)
Select 0°C to 45°C range for Li-ion or Li-polymer battery.
• RTH_(COLD) = 27.28 KΩ
• RTH_(HOT) = 4.911 KΩ
• RT1 = 5.253 kΩ, Select Resistor 5.23k
• RT2 = 31.318 kΩ, Select Resistor 30.9k
After select closest standard resistor value, by calculating the thermistor resistance at temperature threshold, the
final temperature range can be determined from thermistor data sheet temperature-resistance.
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