A 91.7% Peak-Efficiency 48V-to-1V Pseudo Two-Stage Two-Phase Hybrid Buck Converter

This brief proposes a pseudo two-stage two-phase (P2S-2P) buck converter that enhances power efficiency by reducing current in the high-voltage (HV) domain, which has large parasitic components. In contrast, the low-voltage (LV) domain, which has small parasitic components, supplies the majority of the output current (IO) through two inductors that automatically balance their currents. The proposed converter achieves a peak efficiency of 91.7% at an input voltage (VIN) of 48V, an output voltage (VO) of 1V, and the IO of 1.5A. The chip was fabricated using a 180-nm BCD process.