Title :
Current-sensing technique for current-mode DC-DC buck converter with offset-voltage compensation
Author :
Park, Jungeui ; Choi, Jungsoo ; Jeong, Wooju ; Yu, Sanduk ; Jang, Kichang ; Choi, Youngchan ; Choi, Joongho
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Seoul, Seoul
fDate :
Nov. 30 2008-Dec. 3 2008
Abstract :
As the technology of SoC (system-on-chip) implementation has been improved, power management IC such as DC-DC converters should be also integrated into a single chip. The current-mode control DC-DC converter is preferred to the voltage-mode one because of simpler frequency compensation scheme, which makes it possible to utilize the chip with less off chip components. In order to achieve an efficient current-mode control, an elaborate current sensing technique should be incorporated to maintain conversion efficiency. In this paper, a new current sensing circuitry is proposed that compensates the offset voltage of the operational amplifier that is used in current-mirroring sensing scheme. The chip is implemented in a 0.35-mum CMOS technology.
Keywords :
DC-DC power convertors; current mirrors; current-mode circuits; operational amplifiers; switching convertors; system-on-chip; SoC; current-mirroring sensing scheme; current-mode DC-DC buck converter; current-sensing technique; frequency compensation; offset-voltage compensation; operational amplifier; size 0.35 mum; system-on-chip; Buck converters; CMOS technology; Circuits; DC-DC power converters; Energy management; Frequency conversion; Power system management; System-on-a-chip; Technology management; Voltage control;
Conference_Titel :
Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on
Conference_Location :
Macao
Print_ISBN :
978-1-4244-2341-5
Electronic_ISBN :
978-1-4244-2342-2
DOI :
10.1109/APCCAS.2008.4746367
