Substrate embedded magnetic core inductors and method of making

An electronic system, comprising:

• a board;
• a semiconductor chip;
• and an integrated voltage regulator configured to couple to the semiconductor chip, comprising:
• a substrate defining multiple layers of conductive traces separated by respective layers of dielectric material;
• a plurality of magnetic foils each having ferromagnetic alloy ribbons embedded within the substrate adjacent one or more of the multiple layers, wherein a first one of the plurality of magnetic foils is positioned to interface with and be spaced from a first side of one or more of electrically conductive elements of the conductive traces, wherein a single continuous dielectric layer extends from a top of the first one of the plurality of magnetic foils to a bottom of the one or more of electrically conductive elements, and wherein a second one of the plurality of magnetic foils is positioned to interface with and be spaced from a second side of the one or more of electrically conductive elements, wherein the second one of the plurality of magnetic foils is spaced apart and isolated from the first one of the plurality of magnetic foils;
• multiple electrical contacts extending through the substrate, wherein the multiple contacts include at least two electrical contacts disposed laterally to either side of the first or second ones of the plurality of magnetic foils and the one or more of electrically conductive elements.