An 80% peak efficiency, 0.84mW sleep power consumption, fully-integrated DC-DC converter with buck/LDO mode control

Author

Gong, Xiaohan ; Ni, Jinhua ; Hong, Zhiliang ; Liu, Bill

Author_Institution

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

fYear

2011

fDate

19-21 Sept. 2011

Firstpage

1

Lastpage

4

Abstract

A fully-integrated step-down DC-DC converter with LDO mode to reduce the sleep power consumption and improve efficiency at light loads is presented. The converter can switch adaptively between the buck converter and the LDO mode by continuously sensing the load current. Besides, lossless current sense technique is implemented for the mode selection circuits. An improved LDO is also proposed to achieve good stability under various loads. The chip was implemented in 0.13 μm CMOS technology. The measured peak efficiency reaches 80% at 90 mA load, and efficiency at 10 mA load increases by 22.6% compared with forced buck converter mode. Furthermore, the overall power consumption is reduced by 12X at the sleep mode, from 10 mW without the hybrid mode to 0.84 mW.

Keywords

CMOS integrated circuits; DC-DC power convertors; power convertors; CMOS technology; buck converter; buck-LDO mode control; current 10 mA; current 90 mA; efficiency 80 percent; fully-integrated step-down DC-DC converter; light loads; load current; lossless current sense technique; power 10 mW to 0.84 mW; size 0.13 mum; sleep power consumption; CMOS integrated circuits; CMOS technology; Capacitors; Inductors; Sensors; Switches; System-on-a-chip;

fLanguage

English

Publisher

ieee

Conference_Titel

Custom Integrated Circuits Conference (CICC), 2011 IEEE

Conference_Location

San Jose, CA

ISSN

0886-5930

Print_ISBN

978-1-4577-0222-8

Type

conf

DOI

10.1109/CICC.2011.6055338

Filename

6055338