| Summary: | A novel four switches single inductor differential output synchronous buck converter architecture for the power-over-Ethernet (PoE) system is proposed in this paper. A powered device (PD) interface is designed to meet the PoE IEEE Std 802.3af. The proposed system is designed using 0.18 μm CMOS technology and simulated using SIMUCAD. The simulation results show that the converter has a maximum efficiency of 95% at a switching frequency of 800 kHz. Also, it has a percentage of undershoot and overshoot less than 1% as the load current changes from 0.5 A to 1 A. Using a compensator increases the bandwidth from 61 kHz to 80 kHz and the phase margin increases from 20.7° to 49.96°. To validate the proposed converter architecture and design, a comparison between the proposed work and other reported architectures is provided. It shows that the proposed technique has the highest peak efficiency compared with others. Keywords: Power-over Ethernet, Internet of things, Buck converter, Converter efficiency, MOSFET driver
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