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Added footprints for Intel - Altera EN53xx series regulators

KiCad Bot requested to merge github/fork/luca-della-vedova/Altera_EN53xx into master

Created by: luca-della-vedova

Hi all! First of all this is my first footprint contribution so I'm more than grateful for any feedback to make future contributions smoother!

Added footprint for Intel / Altera EN53xx (i.e. EN5322QI) regulators. Datasheet here https://www.intel.sg/content/dam/www/programmable/us/en/pdfs/literature/ds/en5322qi_03454.pdf

The footprint is a QFN24 in a 4x6mm package with a quite particular layout of thermal pads below, I created two variants, one with thermal pads (following the guidelines in datasheet page 14) and one without. image

image

This is the current 3d view:

image

Now there is a few issues that I get in the CI script that I'd like to check with you:

  • Violating F6.3. The two pads are supposed to be connected by a layer of copper that, following the datasheet, should not be exposed and as such I removed the solder mask / paste, it looks fine in the 3d view but I wonder if that is the right way to do it?

  • I had to superimpose an oval and a rectangular pad to create the particular shape and now the pad numbers are hard to read, not sure how to fix that.

  • Thermal vias variant is violating F7.5 with the annular ring being too small. I could increase the size, however that would make it impossible to get the layout specified in the datasheet, page 14. I chose the drill size recommended there (0.33mm) and making the annular ring 0.66 would not allow the suggested via layout.

  • I have no 3d model for this (and I'm not sure how to generate one?), will start to work on the symbol and create a pull request for that in a few days, however symbols are much easier than footprints and I have contributed a few in the past so I guess that merge should be quite straightforward.

Look forward to your feedback and suggestions!

Cheers, /Luca

All contributions to the kicad library must follow the KiCad library convention

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

  • Provide a URL to a datasheet for the footprint(s) you are contributing
  • An example screenshot image is very helpful
  • If there are matching symbol or 3D model pull requests, provide link(s) as appropriate
  • Check the output of the Travis automated check scripts - fix any errors as required
  • Give a reason behind any intentional library convention rule violation.
Edited by Joel Guittet

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