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PTC choose problem

Michael_Jiang
Prodigy 50 points


Dear TI Team,

I faced a design problem when using BQ298218RUGR today.

According to the instruction at section 8.2.3 from the datasheet of BQ298218RUGR, we can configure CTR for second OT protection through an external PTC thermistor, so what kind of PTC should I choose if we want to use BQ298218RUGR?

The pull-up resistor of CTR pin for BQ298218RUGR is 5M, which can be found in the datasheet, so if the VDD voltage is 3.6V, the resistance of the PTC should be larger than 1.92M then the OTP function can be triggered after calculation, I don't know if I calculated right, if yes, the PTC with such big resistance seems to be unreasonable, please help to give some suggestion.

Thanks!