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TPS22910A: Unable to disable

Robert Whalley
Prodigy 200 points
Part Number: TPS22910A
I have the TPS22910A in a circuit, with VIN connected to the output of an Li-Ion 4.2V battery and ON connected to ground by a 100K resistor, VOUT goes to the rest of the circuit. When I apply a voltage (3.3, 4.2 or 5) from a standard Lab power supply, to the ON pin, absolutely nothing happens to the output of the TPS22910A. I was wondering if this sort of behaviour has ever been seen before?
  • 0
    TI__Genius 15780 points

    Hi Robert,

    Is the part turned on with the output voltage high before it is turned off? The TPS22910A does not have any sort of output discharge integrated, so if you don't have a resistor on the output then it will be left floating instead of being pulled down. What is on the output of the device?

    Thanks,

    Alek Kaknevicius

  • 0 in reply to Aleksandras_Kaknevicius
    Prodigy 200 points

    Hi Alek,

    Thanks for your response.

    1. The part is turned on, with the output voltage high, before attempting to disable it.

    2. Although there is no single resistor to ground on its output, the TPS22910A is connected to a BQ27246 gas gauge, and then to a TLV7113318DDSET to feed an entire circuit that takes about 8mA standing current.  I can't see that sustaining a floating voltage for very long. In addition, if I was seeing a floating voltage, it would remain even if I disconnect the input to the TPS22910A, but as soon as I do that, the output collapses. Therefore, my conclusion is still that, despite the fact that I measured 5V on the enable pin, the TPS22910A has not turned off.

    Any further comments would be most welcome and appreciated.

    Regards,

    Rob

  • 0 in reply to Robert Whalley
    TI__Genius 15780 points

    H Rob,

    Do you see the same voltage on the output as the input, or is it lower? This can help us determine whether the switch is completely ON, completely OFF, or not behaving as expected (partially ON).

    Thanks,

    Alek Kaknevicius