I am designing a small four layer PCB with KiCad. The purpose of this PCB is to control and monitor the lights of a car (not for road use) and without having to resort to old relays and fuses.
I have opted for high Infineon switches as they have all the safety features I need. Everything is controlled by a WROOM ESP32 S3 via MQTT. As the power IC of the ESP I used a MAX16904 with 3.3 and 600 mA output.
My question is related to power/ground planes.
Since I have four PCB layers, I thought of creating three power supply planes (12V) top, in1 and in2 all crossed by vias (via stitching) in order to reduce the current and the heat produced. The last layer (bottom) creates a gnd plane. Under the IC power supply I made a ground plane that crosses all 4 levels thanks to the vias.
Photos of the PCB (I don't have the contour lines yet because I still lack a couple of components related to the logic part.) I also tried to divide the circuit into two parts: the upper part is related to power while the lower part on the logic. I hope I was clear enough.
I leave you the screenshots below.