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MSPM0L1304: Dimensioning of VDD and VCORE capacitors

Samuel Junglas
Prodigy 70 points
Part Number: MSPM0L1304

Hi everyone,

we are currently working with the MSPM0L1306SDYY.

In the datasheet, a 10uF cap is recommended for VDD vs. GND and 470nF are recommended for VCORE vs. GND.

We are interested in decreasing these capacitances as we have only little space in our design.

Are there any circumstances under which smaller capacitances suffice? For example: No digital outputs driving high loads, etc.?

Can the VDD capacitance be decreased when VDD is supplied by a highly dynamic linear regulator?

Would decreasing the VCORE capacitance make some internal controller instable?

Best regards

Samuel

  • +1
    TI__Guru 71006 points

    Hi Samuel,

    The 10uF VDD cap is conservative. Yes, you can use a smaller ( smallest recommended value =  4.7uF) cap for VDD, just make sure you verify it works before committing to that value.

    The Vcore 470nF is required and should be a low-ESR with at least a 20% tolerance or better.  Anything less and you run the risk of the Vcore regulator not providing proper regulation which can affect the operation of the core.