An integrated tri-mode non-inverting buck-boost DC-DC converter with segmented power devices and power transmission gate structure

This paper presents a tri-mode non-inverting buck-boost DC-DC converter with segmented power devices, power transmission gate structure and dead-time control to improve the power conversion efficiency and the overall size. The proposed DC-DC converter accepts an input voltage, V_in from 2.7V to 5V and produces an output, V_out ranging from 1V to 6V. A peak power conversion efficiency of 94% is observed from the simulation result. It is designed to operate in buck, boost or buck-boost mode while maintaining peak efficiency. Unlike existing switch-mode power supplies, a power transmission gate is used as the high-side driver to eliminate external components such as the bootstrap circuit. This would save a significant amount of PCB space at the expense of only 18% silicon area overhead. The proposed IC is designed using Dongbu HiTek´s 0.18μm UVCMOS technology.