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TPS62810-Q1: Connection of Power good pin

Milos Milesevic
Prodigy 20 points
Part Number: TPS62810-Q1
Other Parts Discussed in Thread: TPS62827

Hello,

Just want to confirm one thing regarding connection of power good pin for TPS62810-Q1 converter. Application note/ Schematic for similar converter (e.g. TPS62827) shows that power good pin is connected across resistor to input voltage rail and on TPS62810-Q1 this pin is connected across resistor to out voltage rail. Is there any reason for this?

Regarding topology converter and type of this pin (open-drain) we suppose that it can be connected either to input or output voltage rail. Is this correct?

Thanks for your time and hope to hear from you soon!

Kind regards,

   Milos

  • +1
    TI__Genius 14876 points

    Hello Milos,

    You are right, power good pin can be connected through a resistor either to input or output, it does not make a difference in terms of behavior.

    What would be meaningful for the intended purpose in your application is to make sure that the Voltage which is driving the PG is high enough to trigger the next stage (uP processor or Step-down Converter ,etc... ).

    For instance, if the PG signal of TPS62810-Q1 needs to drive the next Power converter Enable pin. You need to make that the PG is connected through a resistor to a voltage which is greater than the enable threshold of the next Power converter.

    Let me know if you have further questions or comments.

    Thanks a lot!


    Regards,
    Dorian  

  • +1 in reply to Dorian Brillet de Cande
    Prodigy 20 points

    Hello Dorian,

    Thanks for quick response!

    Yes, we know that but nice of you to answer in such detail.

    Kind regards,

       Milos