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TPS92643-Q1: Maximum Junction Temperature (TJ) and the Thermal Shutdown Threshold (TSD)

RoyChen776
Prodigy 240 points
Part Number: TPS92643-Q1

Tool/software:

I would like to know the relationship between the Maximum Junction Temperature (TJ) and the Thermal Shutdown Threshold (TSD) of the TPS92643-Q1.

The Max. TJ of this component is 150°C, but the TSD is set at 175°C.

I would like to ask:

  1. Why is TJ < TSD?
  2. What risks exist for TJ between 150~175°C? Could it cause IC damage?

Thanks!

  • 0
    TI__Expert 3550 points

    Hi Roy,

    The thermal shutdown temperature needs to be higher than the maximum Tj in order to guarantee operability at the maximum Tj.  If you look at the thermal shutdown section of the datasheet you will see that (although it wasn't specified in the EC table) the minimum value is 158C, only 8C higher than the maximum Tj. This is likely as close as possible while maintaining appropriate guard banding. 

    There is risk of damaging the device by operating above the absolute maximum ratings. It should be avoided.

    Thanks,

    Jaron