This work presents a 48V/1V DC-DC Point-of-Load (POL) converter for efficient high voltage conversion in data centers. The converter includes (1) a three-level hybrid Dickson topology with GaN/Si hybrid conversion achieving efficient flying capacitor (C F ) utilization. (2) A gradient descent run-time optimizer finding optimal switching frequency (f SW ) and number of fingers turned on (N F ) during converter’s operation. (3) A 10bit hybrid ADC for current sensing. The test chip is fabricated in 0.18μm BCD process and shows a 90.4% peak efficiency at 48V-1V conversion with a 240 A/ $ inch^3 $ current density.