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BQ76952: power dissipation

May
Genius 9880 points
Part Number: BQ76952

Hi,

What is the maximum power dissipation that this device can handle?

Thank you  in advance

Regards,
Maynard

  • 0
    TI__Guru* 81035 points

    Hi Maynard,

    Are you asking about battery stack voltage and maximum pack current? The supply current is small for this device, so it should not normally be dissipating much power. The pack current flows through a sense resistor and the BQ76952 just measures the current across the sense resistor. The sense resistor and protection FETs should be sized according to the maximum expected currents. This application report on using multiple FETs in parallel is helpful for high current applications: https://www.ti.com/lit/an/sluaa09/sluaa09.pdf

    Cell balancing can dissipate some power. The BQ769x2 Cell Balancing app note goes into some detail on how to calculate the power dissipation for balancing and how to size the balancing current to stay within the abs max limits of the device. https://www.ti.com/lit/an/sluaa81/sluaa81.pdf 

    Best regards,

    Matt