Abstract

This paper presents the design of a reconfigurable buck-boost switched capacitor converter using a novel control method that allows coarse and fine control of the output voltage. The converter uses adaptive gain control, discrete frequency scaling and burst mode switching to regulate the power delivered to a range of output voltages and loads. This control scheme has been implemented in a fully-integrated switched capacitor converter design using a standard bulk CMOS 0.18μm process. Simulation results show that the converter has an output voltage range of 0.8-2.2V, can deliver up to 5mA in load current and can be up to 68% efficient.

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