Fully Integrated Single-Input-Dual-Output Switch-Capacitor DC-DC Converter With Fast DVS Speed and Fast Transient Response

This paper presents a fully integrated single-input-dual-output (SIDO) switched-capacitor (SC) DC-DC converter targeting on fast dynamic voltage scaling (DVS) and fast transient response applications. By applying the proposed cell-level 3-step transition sequence with multi-phase interleaving, this work can enable multiple output <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${C} _{\mathbf {LOAD}}$</tex-math> </inline-formula>-free operation with fast and robust DVS operation. The proposed pulse frequency modulation (PFM) loop with power boundary control also supports on-demand sample-and-hold (S/H) operation and load transient enhancement technique to ensure full power utilization while exhibiting robust DVS transition and fast transient response. Fabricated in standard 65nm CMOS, the proposed SC converter achieves SIDO operation with flexible step-down VCRs of 5:4/3/2/1. At <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${V} _{\mathbf {IN}} =1.2$</tex-math> </inline-formula>V, this work achieves a measured peak power conversion efficiency (PCE) of 83%, a fast DVS speed of 263.8mV/ns, and a fast transient recovery time of 19.8ns.