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WEBENCH® Tools/LMZM33602: Why multi_layer PCBs

Ahsan Ameen
Prodigy 80 points
Part Number: LMZM33602
Other Parts Discussed in Thread: LMZ34002,

Tool/software: WEBENCH® Design Tools

I have noticed that most layout PCBs of power modules on WEBENCH power designer are multi-layer like LMZM33602,LMZ34002 etc. while they can be make 2 layered in same space. I want to know is there any specific reason for going to multi layer  besides space constraint like thermal issue etc... It's important, so asking... Please guide for the benefit of me and others.Thanks and Regards.

  • 0
    TI__Guru 50120 points

    Hi Ahsan,

    In general a 4 layered board with the same "circuit space" will have thermal advantage and EMI advantage.

    • Thermal advantage because of more copper to help dissipate heat from the part
    • EMI advantage depending on how the PCB stackup is laid out. Top and bottom layers can be full ground pour and middle layers can be signal/power pour. This helps provide more noise immunity by shielding and "sandwiching" the switching noise in the middle layer such that external noise sources do not couple onto this and cause increase EMI readings.

    However you can definitely use this in a 2 layer design. Refer to Figure 37 to see the difference between 2 layer and 4 layer for thermal design. 

    Regards,
    Jimmy