A ZERO CROSS-REGULATION (ZERO-CR) SINGLE-INDUCTOR BIPOLAR-OUTPUT (SIBO) CONVERTER WITH AN ACTIVE-ENERGY-CORRELATION CONTROL FOR DRIVING CHOLESTERIC-LCD

摘要

A zero cross-regulation (zero-CR) single-inductor bipolar-output (SIBO) converter with an adaptive-energy correlation (AEC) control is proposed as a compact power management solution for driving cholesteric-LCD (Ch-LCD). The SIBO converter can provide a pair of positive and negative output voltages with only one external inductor for achieving the polarity reversion operation in Ch-LCD to obtain high-quality displays. The proposed AEC control decides energy distribution for bipolar outputs without any cross regulation through the embedded prediction function. The chip fabricated by 0.25 urn CMOS process demonstrates zero cross-regulation at bipolar outputs with 90% peak power conversion efficiency.