This work presents a Specification-to-Graphic Design System (GDS) generator for an integrated DC-DC converter. The proposed automated generation flow implements the automated analog design of a Three-Level Flying Capacitor (3LFC) DC-DC converter power stage with integrated gate drivers. The presented design flow uses open source tools, such as Magic VLSI and NGSpice, and it was tested on Google Colaboratory platform for reproducibility. Simulation results demonstrate that the proposed automated generator is able to design a fully-operational open-loop 3LFC DC-DC Converter, therefore validating the proposed generator.