A 2 MHz buck converter with dual-mode control for Power Management Unit

Author

Yao Qian ; Danzhu, L.V. ; Qiuli Li ; Zhiliang Hong

Author_Institution

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

fYear

2014

fDate

28-31 Oct. 2014

Firstpage

1

Lastpage

3

Abstract

A monolithic dual mode buck dc-dc converter is proposed in this paper. The converter operates in Peak-Current-Mode Pulse-Width-Modulation (PWM) with a 2 MHz switching frequency under the heavy load condition. And an Adaptive-On-Time Pulse-Frequency-Modulation (AOTPFM) is employed to suppress the output ripple voltage variations under the light load condition. The DC-DC converter has been implemented in a 0.35 μm CMOS process and measured. The peak efficiency reaches 93% and stay over 78% for load range from 10 mA to 2000 mA with the dual mode control.

Keywords

DC-DC power convertors; PWM power convertors; AOTPFM; PWM converter; adaptive-on-time pulse-frequency-modulation; dual-mode control; frequency 2 MHz; heavy load condition; light load condition; monolithic dual mode buck dc-dc converter; output ripple voltage variation suppression; peak-current-mode pulse-width-modulation; power management unit; switching frequency; Abstracts; Detectors; Phasor measurement units; Pulse width modulation; Semiconductor device measurement; Switches; Time-frequency analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State and Integrated Circuit Technology (ICSICT), 2014 12th IEEE International Conference on

Conference_Location

Guilin

Print_ISBN

978-1-4799-3296-2

Type

conf

DOI

10.1109/ICSICT.2014.7021358

Filename

7021358