DC voltage conversion module, semiconductor module, and method of making semiconductor module

A DC voltage conversion module comprising:

• a substrate including an obverse surface and a reverse surface;
• an input terminal, an output terminal, a ground terminal;
• a DC voltage conversion control element mounted on the obverse surface of the substrate;
• a coil mounted on the obverse surface of the substrate and connected to the DC voltage conversion control element and the output terminal;
• an input-side capacitor mounted on the substrate and connected to the input terminal and the ground terminal;
• and
• an output-side capacitor mounted on the substrate and connected to the output terminal and the ground terminal, wherein:
• the input terminal, the output terminal, and the ground terminal project in a predetermined projecting direction on and along a same single plane, the input terminal, the output terminal, and the ground terminal being positioned parallel to each other,
• the ground terminal is arranged between the input terminal and the output terminal in a direction perpendicular to the projecting direction,
• the substrate is formed with an obverse wiring pattern formed on the obverse surface, a reverse wiring pattern formed on the reverse surface, at least one through-hole penetrating the substrate and overlapping the obverse and the reverse wiring patterns as viewed in a thickness direction of the substrate, and a solder portion filling the through-hole,
• the through-hole is provided at a position overlapping the DC voltage conversion control element, and
• the substrate is formed with an additional through-hole, the obverse wiring pattern includes a block in which the DC voltage conversion control element is mounted, and the block includes a region located at a position that does not overlap the DC voltage conversion control element and formed with the additional through-hole.