21.8 An all-in-one (Qi, PMA and A4WP) 2.5W fully integrated wireless battery charger IC for wearable applications. - Jong Tae Hwang; Dong Su Lee; Jong Hoon Lee; Sung Min Park; Ki Woong Jin; Min Jung Ko; Hyun Ick Shin; Sang Oh Jeon; Dae Ho Kim; Joon Rhee (ISSCC, 2016)