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TPS54233: Placing components beneath DC-DC circuit

Lalit Kumar16
Prodigy 180 points
Part Number: TPS54233

Hi,

Due to design constraints, I would like to place some components below DC-DC circuit design. I don't think it's recommended, but are there any special signals that won't interfere or get interfered with by TPS54233? If no, is the placement constrained to only IC and inductor or the whole area beneath the circuit?

Regards

Lalit Kumar

  • 0
    TI__Genius 13700 points
    Hello,

    There are a number of factors that influence the answer to your question.
    1.How many layers is your PCB?
    2.Is there a solid, interrupted GND plane internal to the PCB that shields one side of the PCB from the other?
    3.What do you mean by placing circuits/traces beneath the TPS54233? Are you able to avoid placing parts under all the higher current loop areas?
    a.Input capacitor current loop
    b. Switch-node
    c. Bootstrap circuit.
    d. Output capacitor current loop.

    If you have a strong, uninterrupted GND plane on an internal layer that shields one side from another and your current loops are tight then lets take a look at Figure 24 of the datasheet.

    You might be able to get away with placing parts on the opposite side of the board beneath that lower portion of that figure: Beneath COMP network, soft-start capacitor, and Enable resistor network.

    However just like there could be EMI and noise issues it is also important to take into account potential thermal issues that could result from characteristic drifts over temperature due to the heating of the TPS54233.

    Let me know if there are any other questions.