MONOLITHIC DC-DC CONVERTER ANALYSIS AND MOSFET GATE VOLTAGE OPTIMIZATION

  • Authors:
  • Volkan Kursun;Siva G. Narendra;Vivek K. De;Eby G. Friedman

  • Affiliations:
  • -;-;-;-

  • Venue:
  • ISQED '03 Proceedings of the 4th International Symposium on Quality Electronic Design
  • Year:
  • 2003

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Abstract

The design of an efficient monolithic buckconverter is presented in this paper. A low swing MOSFETgate drive technique is proposed that improves the efficiencycharacteristics of a DC-DC converter. A model of the parasitic impedances of a buck converter is developed. With thismodel, a design space is described which characterizes theintegration 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 MOSFETthat maximizes efficiency is shown to be lower than a standard full voltage swing. An efficiency of 88% at a switchingfrequency of 102 MHz is achieved for a voltage conversionfrom 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 by3.9% as compared to a full swing DC-DC converter.