2/3 and 1/2 Reconfigurable Switched Capacitor DC-DC Converter With 92.9% Efficiency at 62 mW/mm2 Using Driver Amplitude Doubler. - Toru Sai; Yoshitaka Yamauchi; Hajime Kando; Tatsuya Funaki; Takayasu Sakurai; Makoto Takamiya (IEEE Trans. Circuits Syst. II Express Briefs, 2018)