1 cell boost-up converter with ultra low stand-by current

Abstract

This paper presents the design of a boost converter which is highly optimized for battery-operated portable systems. This converter employs two different architectures. One is an advanced gated oscillator architecture which achieves 80% efficiency at 100 /spl mu/A output current. Another quasi-PWM mode is based on an adaptive constant on-time architecture, but it enables a constant switching frequency at heavy output load. By selecting one of these two architectures, according to the output load, high efficiency and good regulation are achieved.