The Metacapacitors project aims to improve efficiency, functionality and form factor of offline power converters suitable for LED solid-state lighting, with a view to developing an attractive technology platform for load management and power conversion across a broad range of applications. Based on integrated switched-capacitor (SC) topologies, the project adopts an integrated approach from materials to devices to circuits. We designed capacitors based on high- \kappa dielectric nanocrystals, that can be prepared using high-throughput microfabrication/nanotechnology techniques, ink deposition and multilayering. The capacitor dielectric, a nanocomposite composed of (Ba, Sr)TiO_{3} nanocrystals in polyfurfuryl alcohol (BST/PFA, \kappa > 20, 100 \text{Hz} –1\ \text{MHz}, loss < 0.01, 20\ \text{kHz} ), targets a high volumetric capacitance density and ripple current capability. The Dielectric is demonstrated to function in a finished capacitor > \! 1000\ \text{h} at 125 ^\circ \textC. The capacitors were board integrated with a custom hybrid-switched-capacitor-resonant dc–dc converter IC. The converter integrates a balanced SC front-end with a series resonant tank, enabling nearly lossless current regulation and tranformerless galvanic isolation. The converter IC can be stacked in the voltage domain to interface a range of inputs. The tested driver delivers about 15\;\textW at 470\;\textmA to a string of $ 12$ LEDs with $ 90\%$ peak efficiency. [ABSTRACT FROM AUTHOR]