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BQ24171: PCBLayout confirmation

dxd1412
Prodigy 90 points
Part Number: BQ24171

Hi Jeff:

       I have a questions to consult with you

Could you please help confirm what is the problem with my PCBLayout

         

CPCB-1336 REV.G 20230712.PcbDoc

  • 0
    TI__Guru*** 147715 points

    Hi dxd,

    Attached is my recommendation for layout with lowest EMI and best thermal.  You may have to move a few component further out to meet design rules.  It is also generally recommended to not power ground under an inductor as that creates a capacitor that spews EMI.

    CPCB-1336 REV.G 20230712_jlf.PcbDoc

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Prodigy 90 points

    Hi Jeff

    I'm glad to receive your suggestion. There are still some questions about PCBLayout that I would like to consult with you

    Q1：Our PCB can only be single-sided mounted, so the modifications you made to me cannot be referenced. Could you please give me some more suggestions based on single-sided mounting?

    Q2：I will delete the GND at the bottom of the inductor later. Are there any other areas of GND that need to be noted?

  • 0 in reply to dxd1412
    TI__Guru*** 147715 points

    Hi dxd,

    Regarding 1, you can use the same general placement, with the SW node via'ing down and back up.  If you move the inductor further away, change some of the R's and C's to 402 footprint instead of 603, you can return the SW diode top.  There are newer diodes in smaller packages with same current and voltage rating.  The problem will be the BTST capacitor but with some shifting around of the components on the right side of the board, it is possible.  The REGN to BTST is only need if you use 5V input.  

    Regarding 2, you want the input capacitors to have the shortest return path to IC GND as possible, without vias.

    Regards,

    Jeff