An efficient frequency controlled PFM for DC-DC converters Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3f462984g

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  • As more features are being integrated into mobile platforms, the demand for long battery life during standby mode has been increasing. Light load efficiency becomes one of essential features in today's DC-DC converter. The most effective method to improve light load efficiency is to operate the DC-DC converter under pulse-frequency-modulation (PFM) to reduce the switching loss. However, using such architecture could also have the switching frequency get into the band of interest, and requires large off-chip components to filter unwanted signal. In this research, an efficient PFM with frequency limiting is designed. It has similar efficiency profile as the single pulse PFM by utilizing width switching and frequency control techniques. It operates in between 1~2 MHz switching frequency under light load condition.
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