A Switched-Capacitor DC-DC Converter with Pseudo-Continuous Output Regulation using a Three-Stage Switchable Opamp

A Switched-Capacitor DC-DC Converter with Pseudo-Continuous Output Regulation using a Three-Stage Switchable Opamp Hoi Lee and Philip K.T. Mok Hong Kong University of Science and Technology, Hong Kong SC dc-dc converters with continuous-output regulation (COR) for delivering hundred-milliwatt output power have been recently reported [1, 2]. The control schemes of these converters can reduce both input-current ripple [1] and output-voltage ripple [2]. These converters, however, require one extra power transistor cascaded either in front of [1] or behind [2] the power stage for output regulation. The additional power transistor increases the chip area of the converter. This paper proposes a new control scheme for the regulated SC dc-dc converter to achieve COR without using any additional power transistor. Moreover, a three-stage switchable opamp in the proposed control is developed to improve both load-transient response and light-load power efficiency of the converter.

[1]  Hoi Lee,et al.  Switching noise reduction techniques for switched-capacitor voltage doubler , 2003, Proceedings of the IEEE 2003 Custom Integrated Circuits Conference, 2003..

[2]  Michiel Steyaert,et al.  Switched-opamp: an approach to realize full CMOS switched-capacitor circuits at very low power supply voltages , 1994, IEEE J. Solid State Circuits.