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LMR12010 Layout considerations

Mario Bernhard1
Prodigy 50 points
Other Parts Discussed in Thread: LMR12010

Hello,

I'm planning to use the LMR12010 to get 3.3V from a 12V source. Now I would like to layout my board like described in the manuals PCB Layout considerations. In this section is written:

"There should be a continuous ground plane on the bottom layer of a two-layer board except under the switching
node island."

What thus this mean practically?  On the demo board I can't see a discontinuation of the ground plane.

Thanks for information.

Best regards

Mario Bernhard

  • 0
    TI__Genius 10115 points

    This is a repeat of your other post. I will mark it as closed.

     

    Regards,

    Marc

  • 0
    Prodigy 70 points

    Hi Mario,

    I must warn you about potential problems with LMR12010. I used it in two different applications in in both cases I have problems with low frequency ripple. I consumption is 30mA or more it works fine. If it is below this current, output voltage starts jumping a few 100mV with low frequency (20 - 50Hz). 

    I Explained this problem in my post "LMR12010 ripple problems" you can check it. But I didn't receive any explanation what the problem could be and if my explanation of operation is correct. I assume that this solution is not ment to used with low loads. The problem is, that there is not info about thta in documentation.

    Could you please try this (low load a couple of mA) and let me know if you are also experiencing this problem.

    regards

    Janez Humar