A high efficiency 4-output single inductor DC–DC buck converter with self boosted snubber

This paper presents a single-inductor 4-outputs DC–DC buck converter. In order to independently regulate the four output voltages, a multiple control loop operates on linear combinations of the output voltage errors. An original self-boosted snubber circuit enables load power switches control signals boosting without area and power efficiency penalties. The circuit, fabricated using a 0.5-lm CMOS process, provides four output voltages that can be independently regulated from 0 V to the used supply voltage -500 mV. The supply voltage can range from 2.3 up to 5 V. The overall minimum and maximum output currents are 0.15 and 1.8 A, respectively. The measured maximum cross regulation is 40 mV/V with a peak of power efficiency equal to 85%.