A High-Voltage Level Shifter with Sub-nanosecond Delay and 350 V/ns Power Supply Slew-tolerant for Synchronous DC–DC Buck Converter

This paper introduces a level shifter designed for high-voltage DC–DC buck converters. Compared with the conventional level shifter, the proposed level shifter incorporates a novel digital control scheme that actively selects the output signal that first meets the logic threshold, whether rising or falling, thereby significantly enhancing both propagation delay and delay matching. Furthermore, enhanced noise immunity is achieved by the clamping isolation MOSFETs during high dV/dt transitions. Implemented in a 0.18 μm BCD process, post-layout simulation results indicate a propagation delay of 0.58 ns, a worst-case delay mismatch of 0.07 ns, and a dV/dt immunity of 350 V/ns.