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BQ2980: 9.2.3 BQ298x Configuration 3: PTC Thermistor Protection / SELECTION

zaf sen
Prodigy 20 points
Part Number: BQ2980

Hi

I am trying to select a ptc thermistor which protects the circuitry over 80 degrees. Our input voltage is 3.5V But I couldn't see the exactly calculation method in the datasheet. Can you please help with that?

I calculated some ptc values: 

PTC R=450K @ 25C with a positive resistance coefficient from 25-80C of about +25%

or

PTC R=300k @ 25C with a positive resistance coefficient from 25-80C of about +50%