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BQ2980: 12

Rain Cao
Prodigy 20 points
Part Number: BQ2980
Other Parts Discussed in Thread: TMP303,

Hi Team,

We plan to use the BQ298012. We need to help confirm three questions:

2. Can pin5 of this IC support PTC function?

3.How is the maximum charger current and discharge current of IC calculated? 4mv/Rsns? Is there any requirement for Rsns resistance range? Can we use 0.5mΩ resistor to guarantee 8A charge and discharge current?

4.If the BQ298012 IC model is not suitable, we want to protect the 4.2V NMC cell, it also needs to support 0V charging function and charge and discharge current of not less than 6A, is there a more suitable IC recommended?

  • 0
    TI__Genius 17970 points

    Hi Rain,

    Rain Cao said:
    Can pin5 of this IC support PTC function?

    Not directly with any of the parts that are currently in production. There is a system solution however that would allow for implementing OT and UT protections. You can use a TMP303 connected to the CTR pin (as well as an LDO to power the TMP) to achieve external temperature protections.

    When the TMP asserts the CTR pin it may place the bq2980 into SHUTDOWN mode which is described in detail in Section 8.3.7 of the datasheet.

    Rain Cao said:
    How is the maximum charger current and discharge current of IC calculated? 4mv/Rsns? Is there any requirement for Rsns resistance range? Can we use 0.5mΩ resistor to guarantee 8A charge and discharge current?

    Correct. It would be the protection threshold divided by the sense resistor value. In the case of the bq298012, OCC = -4mV/Rsns and OCD = 14mV/Rsns.

    One thing to note is that the minimum sense resistor value is 1mOhm:

    The bq298015 might be a suitable alternative with 8mV OCD and -8mV OCC for an 8A OCD/OCC threshold when using a 1mOhm sense resistor.

    Note that the accuracy would be +/-1mV which would mean that the protection may trigger between 9A and 7A of charge or discharge current.

    Regards,

    Max Verboncoeur