An electronics assembly includes a plurality of planar conductive metal sheets including a first conductive metal sheet, a second conductive metal sheet attached and electrically coupled to the first metal sheet, and a third conductive metal sheet attached and electrically coupled to the second metal sheet. The second metal sheet is located between the first and third conductive metal sheets. Air gaps are defined in the plurality of planar conductive metal sheets to form metal traces that define electrically isolated conductive paths from an outer surface of the first conductive metal sheet to an outer surface of the third conductive metal sheet in a multilevel conductive wiring network. The multilevel conductive wiring network can be attached and electrically coupled to a microchip and to one or more capacitors to form a power converter.

Single-chip solutions and related methods that result in much higher capacitance densities than is achievable with current on-chip solutions and which reduce consumption of planar area of a mounting structure. Embodiments of the present invention use vertical stacking to affix one or more discrete embeddable capacitors to an IC chip superstructure or base structure, and either sequentially or concurrently form electrical connections between the discrete embeddable capacitors and the IC chip. The inventive processes are compatible with CMOS fabrication temperatures for the IC chip while allowing use of capacitors that are fabricated using other processes that may involve much higher temperatures. The inventive processes allow connection of relatively large capacitances (e.g., ?0.5 ?F-1 ?F) to an IC chip without increasing the 2-D footprint of the IC chip. Some embodiments include reconfigurable discrete/affixed capacitors and/or discrete/affixed capacitors with through-vias (distinct from capacitor electrode connections) for connecting circuitry.