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Original question:

TPS7A80: Confusion on start-up time

TPS7A80: NR pin floating

Ben Kuo
Expert 7455 points
Part Number: TPS7A80

Dear team,

Could we leave NR pin floating without any capacitor?

The application is 5Vin to 3.8Vout, and 10uF ceramic cap at each input and output side.

Did you have test result show the different with and with-out NR cap? If you have this, could you share with me?

Regards,

Ben

  • 0
    TI__Mastermind 44790 points

    Hi Ben,

    Yes, you can leave this pin floating. The impact is the output noise will be higher and there will be little soft-start control. Unfortunately, I don't have any data on this but you can test on an EVM if available. 

    I hope this answers your question.