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TPSM843A22: Why are thermal shutdown/reinitiate threshold temperature much higer than the maximum operating junction temperature ?

ping xie
Prodigy 20 points
Part Number: TPSM843A22

Tool/software:

HI ,

  As datasheet 6.1/6.5 section show,   the maximum operating junction temperature is 125℃， thermal shutdown  threshold is 165℃，and thermal reinitiate threshols is 135 ℃（caculated by 30℃  hysteresis value)

Since operation outside the Absolute Maximum Ratings may cause permanent device damage, why setting both thermal shutdown and reinitiate   threshold temperature much higer than the maximum operating junction temperature ? How can the OTP protect the chip?

Thanks.

  • 0
    TI__Mastermind 22120 points

    Ping Xie, 

    Exceeding the typical operating conditions should be avoided in the design process, for the TPSM843A22 this temperature is 125C.     

    Thermal shutdown is a functional protection that is set at a threshold that prevents catastrophic failure.    

    Once the tshut is asserted, the device is shutoff for 7xsoft start time.   The TPSM843A22 is an IC and an inductor in a package the abs max is lower than the stand alone IC.

    The IC in the device has an abs max of 150C.