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LM5160-Q1: Layout questions about AGND and PGND

YW.C
Prodigy 30 points
Part Number: LM5160-Q1
Other Parts Discussed in Thread: LM5160, TIDA-00199, PMP20330

Tool/software:

Hi,

I'm doing PCB layout design using LM5160-Q1 Fly-Buck Topology,

I have read LM5160 Fly-Buck (Isolated Buck) User’s Guide, and PCB layout of PMP20330, TIDA-00199

In all these files the AGND pin and PGND are connected directly to the same ground plane,

Will it be a better layout design if I separate these to pin to two ground plane and connect them together at one point?

  • 0
    TI__Guru* 77360 points

    Hi YW,

    Thank you for posting.  Your thought is nothing wrong, and it is a generic way to do for good practice.  However, since this device the AGND and PGND pins are next to each other, and the single point should be between the two pins as well as the IC underpad, the development team believed ---and they most probably experimentally verified before releasing the part to market---that the two pins could be connected directly to the same GND plane as shown in the recommended layout examples in the datasheet and EVM user's guide.  Therefore, you can do either way. Just a reminder that, if you don't separate, please try to stay as close as possible to the datasheet recommended layout.   

    Hope this helps.

    Best Regards,

    Youhao