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TPS60241: Short circuit behavior

Allen Wachter
Expert 6050 points
Part Number: TPS60241

Can you confirm the short circuit behavior of the TPS60241?  Does it current limit until thermal shutdown?  Or will it hiccup?  Or something else?

Thanks!

  • 0
    TI__Genius 17520 points

    Hi Allen,

    I've forwarded this to the designer and will get back to you with the information. 

    Thanks for your patience,

    Richard

  • 0 in reply to Richard Fu22
    TI__Genius 17520 points

    Hi Allen,

    Unfortunately, we do not have much documentation on this part. That being said, since this charge pump is not an inductor-based switcher, current limit implementation is usually a current-limited switch, which means that the pump switches can run current up to a certain value, and then is limited at that point. You can see this in figures 23, 24, 25, 26 in the TPS60241x datasheet. I have ordered an EVM where I can run some tests on the current limit feature of this part and can get back to you on this.

    Thanks,

    Richard

  • 0 in reply to Richard Fu22
    TI__Genius 17520 points

    Hi Allen,

    Here are my findings from the EVM.

    I've ran the input at 3.5V and have put it into over current condition using a constant-current setting on an electronic load. The results that I have seen is that in overcurrent conditions, the output voltage will simply fall out of regulation until the overcurrent condition is removed. In this case, I would recommend making sure the average output current is below 25mA as to not enter this condition and not damage the part. 

    Thanks,

    Richard

  • 0 in reply to Richard Fu22
    TI__Expert 6050 points

    Hi Richard,

    Thanks for running these tests.  Will the device be damaged if it is run in overcurrent condition?  Won't the thermal protection kick in?

    Thanks!

  • 0 in reply to Allen Wachter
    TI__Genius 17520 points

    Hi Allen,

    The datasheet specifies that exceeding the absolute current limit condition may cause permanent damage to the device (80mA per table 6.1 in the datasheet).

    As for thermal protection, that is for when the junction temperature exceeds 160 degree C. You may have thermal protection kick in during overcurrent conditions when the junction temperature hits the threshold, but that may be when the ambient temperature is already quite hot. When at room temperature, the IC may not become hot enough at overcurrent condition for thermal protection to kick in. 

    Thanks,

    Richard