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Original question:

UCC27611: Internal Regulator Dropout / Headroom

UCC27611: UCC27611

Paul Wirtzberger
Prodigy 10 points
Part Number: UCC27611

What is the recommended and minimum voltage headroom for the internal linear regulator to operate at its optimum line rejection/PSRR?  Any curves available with regards to PSRR/Vin/Iload?

thank you

  • 0
    TI__Expert 4070 points

    Hi Paul,

    Thanks for reaching out!

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    I do not believe this is information we currently have available; sorry about that.  If VDD noise is a concern, please be sure to place the VDD bypass capacitor as close as possible to the VDD pin (and GND pin) with short and wide traces.  This will allow the bypass capacitor(s) to help mitigate noise better by reducing trace inductances.  Consider using two VDD bypass capacitors:

    1. A smaller capacitor value such as 0.1uF to help with minimizing higher frequency noise and in a small package such as 0402 to minimize package inductances.  Place this capacitor closest.
    2. Then place a larger capacitor directly next to the smaller one above with a value of 1uF to 4.7uF.  This will help with more of the bulk bypassing.

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    I hope this helps!

    Thanks,

    Aaron Grgurich