4 layers

Boards in 1 GitHub repository, designed in KiCad, that use the ADP5301ACBZ-4-R7 by Analog Devices (-40℃~+125℃@(TJ) 1 2.15V~6.5V 2MHz 50mA 800mV~5V Buck Buck Built-in Yes WLCSP-9(1.6x1.9) DC-DC Converters ROHS). See how each wires it, with its parts, size, README and files; the ADP5301ACBZ-4-R7’s symbol, footprint and pinout are on its own page.
