I'm looking at including a buck converter to power a 3.3V microcontroller, and I used TI's Power Designer to generate a recommended layout for my parameters.
I noticed that the copper planes are quite large here compared to the footprints of the components involved. I understand the value in having a plane for the ground, since it's a common reference point, but why are there such large areas for the other connections? Is it for heat dissipation, or other reason(s)? (Or am I misunderstanding something about how to read the diagram?)