I’m working on a 4 layer PCB and this is my stackup:
15-VCC (3V3 plane)
On top layer I have a buck converter with 3V3 and GND output (0.5A max abs. current). How should I connect 3V3 and GND to inner plane?
i.e. with 2 or more vias (2 x 3V3 and 2 x GND) and connecting it like this:
Power plane: via to 3V3 from layer 1 to layer 15 GND plane: via to GND from layer 1 layer 2
Is it correct? Also do I need vias for all the combinations:
About power planes:
Do I have to keep them as full as possible ?
I have also some unwired connection and my TOP and BOTTOM layers are full. Can I use L2 or L3 to connect? which one is better to use ? GND or 3V3 for signal ?