Hi all. This is my first post here. Really hope someone can help :) Im facing some problem regarding the design of my little switch mode boost regulator. It uses the max631, which has a built it catch diode. The input voltage to the max631 comes from a logic controlled p channel mosfet. Vsupply to the drain; one end of the inductor that the max631 requires is connected to the mosfet's source, and the other end to Vin of the chip. The max631 has a built in "catch" diode. Since im not too sure how smps and coils really work, I do not really know if a flywheel diode parallel to the inductor is needed or not. To the best of my understanding, I think flywheel and catch diode mean the same thing. Is it needed? Would the addition of a parallel flywheel diode lower the switching effiency? I've uploaded a brief sketch. Do take a look. Many thanks in advance!