Abstract
This article presents a dual-output switched-capacitor (DOSC) dc-dc regulator to support hundreds-of-milliampere load per output. To save chip and board areas, the regulator adopts an all-nMOS auto-configurable power stage and generates two different output voltages via sharing flying capacitors and power transistors. In the controller, a continuous gate-drive modulation (CGDM) scheme is proposed to minimize the output cross regulation when one output undergoes large load step changes. A small output voltage ripple is also achieved at each output by the CGDM with only a small capacitance of 2.2 μF/output under heavy-load conditions. Implemented in a standard 0.13- μm CMOS process, the proposed regulator generates two regulated outputs of 0.8 V and 1.6 V from the input of 2.7-4.2 V. It supports a maximum load of 600 mA/output, provides a low output ripple of ≤20 mV with the CGDM, and achieves a peak power efficiency of 89.5%. The output cross regulation is only 0.01 mV/mA under large load step changes of 580 mA. Compared with state-of-the-art SIMO dc-dc converters, the proposed work achieves > 4× reduction in the output cross regulation under > 2× larger load step changes and > 2× smaller load capacitance/output.
Published Version
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