DC-DC converters with high efficiency over wide load ranges
Name
42678774-MIT.pdf
Description
Full printable version
Size
3.32 MB
Format
Adobe PDF
Checksum (MD5)
0274a7878835771787b20258a4845b91
Author(s)
Bretz, Joshua Harlen, 1974-
Advisor(s)
Anantha P. Chandrakasan.
Alternative Title
Direct current-direct current converters with high efficiency over wide load ranges
Date Issued
1999
Publisher
Massachusetts Institute of Technology
Abstract
An integrated switching regulator is presented, including theory of operation, circuit design, and test results. This DC-DC converter introduces several novel circuits which enable more efficient operation at output powers from l00J.1W to lW. Efficiency above 80% is achieved from 500JlW to 500mW. Specifically, depending on the load current, the regulator automatically switches between Pulse Frequency Modulation (PPM) and Pulse Width Modulation (PWM), and also automatically selects the optimum switching MOSFET. The current sensing is done without an additional current sense resistor. PFM mode operation is synchronous to allow sampled data systems to avoid sampling on switching transitions. In all modes of operation, the regulator output voltage is digitally programmable. This enables variable voltage architectures, in which the power supply of a digital system is dynamically changed depending on the throughput requirements, resulting in significant power reductions.
Description
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
Includes bibliographical references (leaf 63).
Subjects
Electrical Engineering and Computer Science
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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