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TPS61042: Can the device be destroyed if the ctrl pin voltage is higher than Vin?

Ron Baktis
Prodigy 10 points
Part Number: TPS61042

I have a design where the Vin pin of the tps61042 is connected directly to a battery and the ctrl pin is connected to a microcontroller that runs off a 3.3 V supply.  It's possible for the ctrl pin to be at 3.3 V when the Vin pin is at 2.5 V or less under low battery conditions.  I've had three chips fail, all when the battery was low.

  • 0
    TI__Genius 9630 points

    hi Ron

        Basically, there should be no problem if ctrl pin voltage is higher than input voltage. To further confirm this, is it available to produce a low voltage ctrl signal (by wave generator)?  Besides, when you mentioned "three chips fail", did you mean the ICs were destroyed and cannot be powered up anymore? 

  • 0 in reply to Mason Wang
    TI__Genius 9630 points

    hi Ron

       If there is no more question, I will close this thread. 

        thanks

  • 0 in reply to Mason Wang
    Prodigy 10 points

    The ICs were destroyed and would get hot to the touch when powered up but did not produce any output.  I still don't know what happened, but all three failures happened while running the circuit off a particular power supply.  I suspect a faulty power supply so I switched to a different one.  So far no failures.  Thanks for your help.