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TPS2543 Temp concern

Geovid Kali
Intellectual 1245 points
Other Parts Discussed in Thread: TPS2543

Hi team,

The TPS2543 is rated for 3A if you use RILIM_HI = 16.9kOhm but is rated at a max continuous current of 2.5A.  What would happen if I ran the part at 3A continuously?  My worry is that the part may go into thermal shutdown.  I could not find any info in the data sheet for temperature at a current of 3A.

Thanks,

Geovid Kali

  • 0
    TI__Expert 7990 points

    The 2.5A / 125C maximum Recommended ratings are provided for long term reliability and are a bounding part of the device specification.  The current  implied by the 16.9K current limit program resistor in the Electrical Characteristics table sets the minimum edge of the fault protection at just over the 2.5A Recommended rating.  

    Given a 16.9K current-limit program resistor, a viable load should not draw more than 2.5A (average).  With this setup, the result of a load drawing more than 2.7A can be a load reset as the output voltage will droop or collapse in response to the current limit action.

    Various thermal metrics are provided in the datasheet THERMAL INFORMATION table.  The stated numbers are for a 2s2p coupon with the pad vias connected to the ground plane.  The noted Application Report provides background to these metrics.  Thermal design considerations are recommended whenever significant currents are drawn through a part like this one.