Hi,
I'm trying to design a 4 layer pcb with:
-XL6008 based buck boost converter on one side (fixed to 12v output)
-XL4015 based buck converter on the other (fixed 5v output)
Keep in mind I'm a beginner and learning pcb design online as I go.
I was planning of having 2 ground planes in the middle but are there other things I need to consider as the 2 converters will be really close? Will there be any interference? I have to place them on either side as the pcb will be quite small 50x80mm and I have other stuff on the buck converter side (Attiny control IC with status leds and buttons).
Also I don't really know how to place the two inductors for the XL6008 buck boost converter.
I have the schematics from the ICs datasheets:
https://www.lcsc.com/datasheet/lcsc_datasheet_1809200019_XLSEMI-XL6008E1_C73012.pdfhttps://www.lcsc.com/datasheet/lcsc_datasheet_1811081616_XLSEMI-XL4015E1_C51661.pdf

Thank you for your time
UPDATE 1:



So after some digging and seeing your answers I've tried fitting both converters on the same side of the board. I tried to place the components the best I could (inductors away from FB line, keeping the loops small and tight).
For the buck boost I couldn't find an easy to buy coupled inductor (designing on easyEDA, buying LCSC and JLCPCB), so went for two separate inductors. I read I lose in efficiency, is that all?
The input is a 3S lipo.
output load is around 3A minimum for the 5V and 2A for the 12V.
There is also a mosfet setup for an emergency stop between the lipo input and direct output (goes to 20A UBECs)