The popularity of lithium-ion batteries in various mobility and energy storage applications has driven increasing demand for efficient and reliable battery charging solutions. Synchronous Buck Converters have gained prominence as a viable choice for regulating the charging voltage and current in these applications due to their inherent advantages, such as high efficiency, compact size, and ease of control. To operate a normally-on MOSFET, it is necessary to use a gate drive with the ability to provide bipolar voltage. The paper suggests utilizing the bootstrap driving method for this purpose. A Double Pulse Test circuit is proposed based on Synchronous Buck Converters to analyze and evaluate MOSFET working characteristics at the operating point. Simulation results confirm the operation of the proposed circuit