Title :
Monolithic DC-DC converter analysis and MOSFET gate voltage optimization
Author :
Kursun, Volkan ; Narendra, Siva G. ; De, Vivek K. ; Friedman, Eby G.
Author_Institution :
Dept. of Electr. & Comput. Eng., Rochester Univ., NY, USA
Abstract :
The design of an efficient monolithic buck converter is presented in this paper. A low swing MOSFET gate drive technique is proposed that improves the efficiency characteristics of a DC-DC converter. A model of the parasitic impedances of a buck converter is developed. With this model, a design space is described which characterizes the integration of both active and passive devices of a buck converter onto the same die based on a 0.18 μm CMOS technology. The optimum gate voltage swing of a power MOSFET that maximizes efficiency is shown to be lower than a standard full voltage swing. An efficiency of 88% at a switching frequency of 102 MHz is achieved for a voltage conversion from 1.8 volts to 0.9 volts with a low swing DC-DC converter. The power dissipation of a low swing DC-DC converter is reduced by 24.5%, improving the efficiency by 3.9% as compared to a full swing DC-DC converter.
Keywords :
CMOS analogue integrated circuits; DC-DC power convertors; power MOSFET; switching convertors; 0.18 micron; 1.8 to 0.9 V; 102 MHz; CMOS technology; MOSFET gate voltage optimization; active devices; buck converter; monolithic DC-DC converter analysis; optimum gate voltage; parasitic impedances; passive devices; power MOSFET; power dissipation; switching frequency; voltage conversion; Buck converters; CMOS technology; DC-DC power converters; Impedance; MOSFET circuits; Power MOSFET; Semiconductor device modeling; Space technology; Switching frequency; Voltage;
Conference_Titel :
Quality Electronic Design, 2003. Proceedings. Fourth International Symposium on
Print_ISBN :
0-7695-1881-8
DOI :
10.1109/ISQED.2003.1194746