A non-isolated step-up/step-down DC-DC solution based on the EG1151 chip, using a four-switch Buck-Boost topology, with an input voltage range of 9V - 35V (customizable for a wider range), maximum efficiency of 96%, featuring constant current control for output, over-temperature protection, and short-circuit protection, adjustable output voltage and current, suitable for various fields such as mobile energy storage, electric bicycles, and industrial control.