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TPS767D30 - Sink capacity at reset pin

Hi all

Would you mind if we ask TPS767D30?

<Question1>
How much is the sink capacity at reset pin?

<Question2>
How much of the minimum value resister can be set at reset pin?

Kind regards

Hirotaka Matsumoto

  • Hi Hirotaka,

    (1) The sink capacity can be found in the EC line item for RESET/ VOL. It is specified for 1mA maximum to output 0.4V, at a Vin of 2.7V.
    (2) The minimum value resistor will depend on the pull-up voltage - the equation to calculate this is Rpullup = (Vpullup - 0.4V)/1mA. For example if you are pulling up to 10V than Rpullup = 9.6kOhm minimum.

    Regards,
    David
  • David san,

    Thank you for your prompt reply!

    We know that it is specified for 1mA maximum to output 0.4V, at a Vin of 2.7V on the datasheet.

    We guess that the sink current of Reset depends on internal FET's Absolute rating current. 

    By increasing the sink current of Reset, the voltage at Reset increases. 
    That's why, how much is maximum Iout the sink current?

    Or, is internal FET's Absolute rating current 1mA? 

    If internal FET's Absolute rating current isn't 1mA, dou you have as following characteristics or figure?
    <For example>
    Iout=1mA/Vout=0.4V
    Iout=2mA/Vout=0.5V?
    Iout=3mA/Vout=0.6V?
    Iout=4mA/Vout=0.7V?

    We need your help.

    Kind regards,

    Hirotaka Matsumoto

  • Hi Hirotaka-san,

    We do not have that information available for this part, as it is quite old. The internal FET can likely sink more current but I am not sure on how much more.

    Regards,
    David
  • David san,

    Thank you for your reply!
    Ok, we got your circumstance.

    By the way, why is Sink current of the test condition defined Io=1mA?
    You mentioned that 1mA is not  MAX continuous current value of FET.
    So, if you know, could you let us know what Io=1mA means?

    Kind regards,

    Matsumoto Hirotaka

  • Hi Hirotaka-san,

    The current should technically be Iin or Isink as the current is flowing into the device. The test conditions mean that they force 1mA into the RESET/ pin and measure the voltage at the pin while RESET/ is being asserted. The typical measured RESET/ voltage for this case is 0.15V, and the max is 0.4V .

    Regards,
    David
  • David san,

    Thank you for your reply!
    Ok, we understood that the test conditions mean that they force 1mA into the RESET.
    The internal FET can likely sink more current but test condition is forced 1mA.
    Is our recognition correct?

    Kind regards,

    Hirotaka Matsumoto

  • Hi Hirotaka-san,

    That is correct.

    Regards,
    David