Pololu 12V, 4.5A Step-Down Voltage Regulator — power by Pololu.
Vendor-supplied listing. This part is made by Pololu and listed from GetFPV. Full specifications and current availability are held by the manufacturer; this listing carries the part, its price and its category.
Carried by GetFPV and Rotor Riot in this catalogue, so it does not depend on one supplier here.