A Reconfigurable Series-Parallel Charger for Dual-Battery Applications with 89W 97.7% Efficiency in Direct Charging Mode. - Sung-Woo Lee; Taejin Jeong; Yonghwan Cho; Jeongdu Yoo; Sungkyu Cho; Minkyu Kwon; Daewoong Cho; Sang Hee Kang; Jung-Wook Heo; Hyoung-Seok Oh; Sung-Ung Kwak (ISSCC, 2022)