A high-efficiency fully digital synchronous buck converter power delivery system based on a finite-state machine

Authors:
Dae Woon Kang;Yong-Bin Kim;James T. Doyle
Affiliations:
National Semiconductor Corporation, Longmont, CO;Department of Electrical and Computer Engineering, North-eastern University, Boston, MA and University of Utah, Salt Lake City, UT;National Semiconductor Corporation, Longmont, CO
Venue:
IEEE Transactions on Very Large Scale Integration (VLSI) Systems
Year:
2006

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Abstract

A fully digital, self-adjusting, and high-efficiency power supply system has been developed based on a finite-state machine (FSM) control scheme. The system dynamically monitors circuit performance with a delay line and provides a substantially constant minimum supply voltage for digital processors to properly operate at a given frequency. In addition, the system adjusts the supply voltage to the required minimum under different process, voltage, and temperature and load conditions. The design issues of the fully digital power delivery system are discussed and addressed. This digital FSM scheme significantly reduces the complexity of control-loop implementation (2.