Hsuan-Ju Chen, Yi-Hsiang Wang, Peng-Chang Huang, Tai-Haur Kuo: 20.9 An energy-recycling three-switch single-inductor dual-input buck/boost DC-DC converter with 93% peak conversion efficiency and 0.5mm<sup>2</sup> active area for light energy harvesting. ISSCC 2015: 1-3