A High-Efficiency CMOS DC-DC Converter With 9-mu s Transient Recovery Time

作者：Liu Pang Jung^*; Ye Wei Shan; Tai Jia Nan; Chen Hsin Shu; Chen Jau Horng; Chen Yi Jan Emery

来源：IEEE Transactions on Circuits and Systems I-Regular Papers, 2012, 59(3): 575-583.

DOI：10.1109/TCSI.2011.2167259

• CMOS
• dc-dc converter
• efficiency
• transient response

This paper presents an efficient CMOS dc-dc converter with fast transient recovery. A fast-transient control operating in conjunction with a linearly scaled gate-driving technique is used to concurrently improve the transient response and light-load efficiency of a dc-dc converter. The controller operates under a pulse-width modulation mode during steady state and enables a saturation mode during transient to attain fast transient response. The linearly scaled gate-driving technique optimizes the gate-driving voltage with respect to the changing load leading to lower gate-driving loss and better light-load efficiency. A prototype chip was implemented using a commercial 0.35-mu m CMOS process to validate the proposed techniques. The measurement result shows a 5% increase in light-load efficiency and achieves an overall maximum efficiency of 90%. Moreover, the transient recovery time of a 450 mA step load change is less than 9 mu s.

• 出版日期2012-3
• 单位中国科学院电工研究所