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BQ2057W: Battery Temperature Monitoring

dipesh karli43
Prodigy 140 points
Part Number: BQ2057W

Hi all,

 I have used BQ2057W  in my design for batter charging application. I have used battery with NTC thermistor.

I have used reference design given in TI's BQ2057W datasheet. For Battery Temperature Monitoring, two Resistors values need to be calculated. As shown below.

W

In my case, Rth value is 7.2K and Rtc value is 8.6K. So, when I calculate Rt2  Value. I got negative resistor value.

So which value resistor is to be used for voltage divider. Any solution Regarding this.

Regards,

Dipesh Karli