This paper describes a method using a standard positive buck converter to form a negative boost converter, which takes an existing negative voltage and creates an output voltage with a larger (more negative) amplitude. Using a boost regulator results in a smaller, more efficient, and more cost-effective design. A complete design example using an integrated FET buck converter is provided here. The basic theory of operation, high-level design trade-offs, and closed-loop compensation design of the resulting converter are discussed.