Title :
0.8V start-up 92% efficiency on-chip boost DC-DC converters for battery operation micro-computers
Author :
Nakase, Yasunobu ; Hirose, Shinichi ; Goda, Toru ; Hu, Kehui ; Onoda, Hiroshi ; Ido, Yasuhiro ; Kono, Hiroyuki ; Kong, Wei ; Zhang, Wei ; Oishi, Tsukasa ; Mori, Shintaro ; Shimizu, Toru
Author_Institution :
Renesas Electron. Corp., Japan
Abstract :
This paper presents embedded use DC-DC boost converters for battery operating micro-computers. Pulse frequency modulation (PFM) is employed for fast response. A new control method is applied to improve the efficiency by regulating the inductor current optimally from both of input voltage and load current. A synchronous rectifier converter fabricated by a 180nm CMOS technology achieves the efficiency of 92% at the condition of 1.5V input voltage and 20mA load current as predicted through a model analysis. The efficiency is improved more than 15% compared with the case of ILmax being a fixed value.
Keywords :
CMOS digital integrated circuits; DC-DC power convertors; computer power supplies; electric current control; inductors; microcomputers; pulse frequency modulation; voltage control; CMOS technology; PFM; battery operation microcomputers; current 20 mA; inductor current; model analysis; on-chip boost DC-DC converters; pulse frequency modulation; size 180 nm; synchronous rectifier converter; voltage 0.8 V; voltage 1.5 V; Batteries; CMOS integrated circuits; CMOS technology; Inductors; MOS devices; Rectifiers; Voltage control;
Conference_Titel :
Solid State Circuits Conference (A-SSCC), 2011 IEEE Asian
Conference_Location :
Jeju
Print_ISBN :
978-1-4577-1784-0
DOI :
10.1109/ASSCC.2011.6123654
