Buck DC-DC converter for fast transient response using dual current pumping control technique

Abstract

The dual current pumping control technique is presented in this paper to achieve fast-transient response for dc-dc converters. The current buffers are adopted to provide additional current paths with output nodes of dc-dc converter and error amplifier. This method leads to accelerating output level of error amplifier and charging/discharging output capacitor rapidly. The proposed dc-dc converter with dual current pumping control technique is fabricated using TSMC 0.35μm 2P4M CMOS technology. Load current from 50mA to 500mA. Transient recovery time with step-up and step-down are 2.3μs and 1.2μs, respectively. Compared with the conventional dc-dc converter, simulation results demonstrate that the transient recovery time of proposed dc-dc converter with dual current pumping control technique is improved over four times.