A 40-MHz current-mode hysteretic controlled switching converter with digital push-pull current pumping technique for high performance microprocessors

Ever-increasing power demands of microprocessors have necessitated fast-response, high-speed power converters. This paper presents a fast transient, hysteretic current-mode converter design with a push-pull current pump. By using a current feedback technique in contrast with the parallel feedback co...

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Bibliographic Details
Published inTechnical Papers of 2014 International Symposium on VLSI Design, Automation and Test pp. 1 - 4
Main Authors Sankman, Joseph, Min Kyu Song, Dongsheng Ma
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.04.2014
Subjects
Inductors
Iterative closest point algorithm
Microprocessors
Regulators
Steady-state
Switching converters
Transient analysis
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Summary:Ever-increasing power demands of microprocessors have necessitated fast-response, high-speed power converters. This paper presents a fast transient, hysteretic current-mode converter design with a push-pull current pump. By using a current feedback technique in contrast with the parallel feedback control approaches by the prior art, performance and stability are greatly enhanced. The system is implemented and verified on a 0.18 μm CMOS process through fully transistor-level simulations, operating up to 40 MHz. In comparison with the buck converter by itself, the current pump improves the transient response by reducing V OUT undershoot magnitude and settling time by 33.3% and 25.6%, respectively, and overshoot magnitude and settling time by 18.3% and 40.4%, respectively. Undershoot and overshoot are maintained below 3%, at 2.8% and 2.9%, respectively.
DOI:10.1109/VLSI-DAT.2014.6834889