Fully integrated DC-DC converter and a 0.4V 32-bit CPU with timing-error prevention supplied from a prototype 1.55V Li-ion battery. - Matthew J. Turnquist; Markus Hiienkari; Jani Mäkipää; Ruzica Jevtic; Elina Pohjalainen; Tanja Kallio; Lauri Koskinen (VLSIC, 2015)