Challenge on compact size DC-DC buck converters with high-speed current sensor and on-chip inductors

This paper proposes a compact size DC-DC buck converter toward on-chip inductors and minimized external components. Multi-phase, high switching frequency and pseudo continuous conduction mode (PCCM) techniques achieve the possibility to implement on-chip inductors. The effective inductance is about...

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Bibliographic Details
Published in2007 50th Midwest Symposium on Circuits and Systems pp. 670 - 673
Main Authors Shih-Min Chen, Chun-Yu Hsieh, Ke-Horng Chen
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.08.2007
Subjects
Buck converters
Frequency modulation
Inductance
Inductors
Optical modulation
Pulse width modulation
Space vector pulse width modulation
Switches
Switching converters
Switching frequency
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Summary:This paper proposes a compact size DC-DC buck converter toward on-chip inductors and minimized external components. Multi-phase, high switching frequency and pseudo continuous conduction mode (PCCM) techniques achieve the possibility to implement on-chip inductors. The effective inductance is about 20nH. Due to high switching frequency above 20MHz, it is a challenge to have a highly accurate current sense for high performance of converters. Simulation results demonstrate that the accuracy of high-speed current sensor is about 95%. Besides, mode switch between pulse width modulation (PWM) and pulse frequency modulation (PFM) alleviates the limitation of high-speed current sensor in case of light load condition. Compact size design of converter is an advanced technique as a power module for system-on-chip (SOC) designs.
ISBN:1424411750
9781424411757
ISSN:1548-3746
DOI:10.1109/MWSCAS.2007.4488668