A dual-mode digitally controlled converter for synchronous buck converters operating over wide ranges of load currents

Author

Xiao Ma ; Ping Luo ; Xin Chen ; Jian Gong ; Shaowei Zhen

Author_Institution

State Key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Sci. & Technol. of China, Chengdu, China

fYear

2012

fDate

Oct. 29 2012-Nov. 1 2012

Firstpage

1

Lastpage

3

Abstract

A monolithic digitally controlled Pulse Width Modulation/Pulse Skip Modulation (PWM/PSM) dual-mode converter for synchronous buck DC/DC converters is proposed in this paper. The controller operates in PWM during Continuous Conduction Mode(CCM) at 2MHz switching frequency while PSM is adopted to reduce switching loss at Discontinuous Conduction Mode(DCM). Several blocks, including a low power Analog-Digital Converter (ADC), a high resolution and linearity Digital Pulse Width Modulator (DPWM) with a digital DLL and a PSM controller, are described in detail. The converter is simulated in a standard 0.13μm CMOS process, and the simulation results show the high efficiency over a wide of load and fast transient response of digital converter.

Keywords

DC-DC power convertors; PWM power convertors; analogue-digital conversion; digital phase locked loops; low-power electronics; transient response; CCM; CMOS process; DCM; DPWM; PSM controller; digital DLL; digital pulse width modulator; discontinuous conduction mode; dual mode digitally controlled converter; frequency 2 MHz; load currents; low power analog-digital converter; pulse skip modulation dual-mode converter; pulse width modulation dual-mode converter; size 0.13 mum; synchronous buck DC-DC converters; transient response; Delay; Linearity; Pulse width modulation; Radiation detectors; Switches; Threshold voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State and Integrated Circuit Technology (ICSICT), 2012 IEEE 11th International Conference on

Conference_Location

Xi´an

Print_ISBN

978-1-4673-2474-8

Type

conf

DOI

10.1109/ICSICT.2012.6467775

Filename

6467775