| Abstract: |
Multistage buck converters have gained significant attention as an effective solution for deep step-down DC–DC conversion in modern power-electronic applications where conventional single-stage buck converters suffer from severe limitations. Extremely low duty cycles, elevated switching stress, increased ripple, and poor dynamic performance restrict the viability of single-stage topologies in systems requiring high conversion ratios. By distributing the voltage reduction across multiple cascaded stages, multistage buck converters provide improved operating conditions, enhanced ripple suppression, and reduced electrical and thermal stress on power devices. This review presents a comprehensive examination of modelling principles, including steady-state behaviour, current distribution, and simulation methodologies, as well as performance characteristics such as efficiency trends, ripple attenuation, and component stress analysis. The comparative insights drawn from existing literature demonstrate that while multistage converters offer notable advantages in stability, ripple performance, and stress management, they also introduce challenges related to increased component count, potential interstage resonance, and complex control requirements. The findings highlight the importance of accurate modelling, optimized stage design, and advanced control strategies for achieving high-performance deep step-down conversion. This review serves as a consolidated reference for researchers and engineers working toward the development and optimization of cascaded buck converter architectures. |
