Embodiments herein relate to integrating FIVR switching circuitry into a substrate that has a first side and a second side opposite the first side, where the first side of the substrate to electrically couple with a die and to provide voltage to the die and the second side of the substrate is to couple with an input voltage source. In embodiments, the FIVR switching circuitry may be printed onto the substrate using OFET, CNT, or other transistor technology, or may be included in a separate die that is incorporated within the substrate.