A 10MHz ripple-based on-time controlled buck converter with dual ripple compensation and real-time efficiency optimization

Author

Lu, Danzhu ; Yu, Jiale ; Hong, Zhiliang ; Mao, Jingwen ; Zhao, Hui ; Cirot, Eric

Author_Institution

State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China

fYear

2012

fDate

17-21 Sept. 2012

Firstpage

333

Lastpage

336

Abstract

A 10MHz ripple-based on-time controlled buck converter is presented. A novel low-cost dual ripple compensation, which consists in coupling capacitor compensation and passive ESR compensation, is proposed to achieve fast load transient response and robust stability simultaneously. Implemented in 2P4M 0.35μm CMOS process, the converter achieves fix-frequency output with ripple below 10mV and overshoot of 10mV at 400mA step load transient response. With real-time width optimization of power transistors in ultra heavy load and PFM control in light load, the efficiency keeps over 83% for load range from 20mA to 1.5A and the peak efficiency reaches 90.16%.

Keywords

CMOS integrated circuits; circuit optimisation; compensation; power transistors; switching convertors; transient response; 2P4M CMOS process; PFM control; capacitor compensation; current 20 mA to 1.5 A; efficiency 83 percent; frequency 10 MHz; low-cost dual ripple compensation; passive ESR compensation; power transistors; real-time efficiency optimization; real-time width optimization; ripple-based on-time controlled buck converter; robust stability; size 0.35 mum; step load transient response; switching power converters; voltage 10 mV; Capacitors; Inductors; Optimization; Real-time systems; Switches; Switching frequency;

fLanguage

English

Publisher

ieee

Conference_Titel

ESSCIRC (ESSCIRC), 2012 Proceedings of the

Conference_Location

Bordeaux

ISSN

1930-8833

Print_ISBN

978-1-4673-2212-6

Electronic_ISBN

1930-8833

Type

conf

DOI

10.1109/ESSCIRC.2012.6341322

Filename

6341322