Abstract This paper presents a 92.4%-peak-efficiency 48V to 0.8-to-1.6V hybrid converter based on an inductor-interleaved Fibonacci switched-capacitor (I2-FSC). The proposed converter reduces ΔVL with few flying capacitors, thereby achieving a high duty cycle under ultra-low VCRs and reducing ACR loss. It also minimizes switching and conduction losses, while current distribution lowers DCR loss and a fixed 0.5 duty in the capacitive path reduces VO ripple. The chip is fabricated in a 180nm BCD process. As data centers become more advanced, point-of-load (PoL) converters that generate low output voltages (0.8-to-1.6V) directly from a 48V input are becoming increasingly important. To enable such direct conversion, converters must achieve high efficiency at ultra-low voltage conversion ratios (VCRs). Conventional half-bridge converters [1] support low VCR operation under ideal conditions, but they suffer from an extremely narrow duty cycle (D),
Hyun-Woo Jeong, Chan-Ho Lee, Hyeon-Ji Choi, Sung-Wan Hong
Sogang University, Seoul, Korea