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BQ2970: BQ2970DSE - Over Discharge / Charge Current Protection

Steve Clarke
Prodigy 115 points
Part Number: BQ2970


Hello,

I am making a safety assessment on a product that uses this device for battery protection. Can somebody help me please 

How is the over current level determined ? as i need to prove that the circuit meets power dissipation levels.

regards

Steve 

  • 0
    TI__Mastermind 42070 points

    Hello Steven,

    The over-current threshold is set in-factory. You can see the available part and their thresholds in Section 5 Device Comparison Table of the datasheet.

    The BQ2970 part itself detects the difference in voltage between V- and Vss to determine the over-current condition. This difference is determined by the RDSON of the CHG/DSG FETs. Section 10.2.2 Detailed Design Procedure details an example of how to create a criteria for the FET selection.

    Best Regards,

    Luis Hernandez Salomon

  • 0 in reply to Luis H. S.
    Prodigy 115 points

    Hi Luis

    Thank you for the explanation

    Regards

    Steve