High-accuracy hysteretic current-mode regulator for powering microprocessors

Fast load transient response and high regulation accuracy are two strict specifications of voltage regulator module (VRM) design for powering desktop and mobile microprocessors. Although hysteretic controlled regulator is well known having the fastest load transient response, the regulation inaccuracy limits hysteretic regulator's extensive usage in VRM application. In this paper, a high-accuracy hysteretic current-mode regulator without sacrificing other performances for powering microprocessors is proposed. After delay-caused offset is identified to be the dominant source of the regulation inaccuracy, the design idea to compensate this inaccuracy and the corresponding implementation circuit are explained and verified by experimental results.