A negative buck converter, an easier way to generate an additional negative rail in systems that already have a larger negative voltage supply, is described.
Negative buck converter
Many system designers need an easy way to produce a negative 3.3V power supply. In systems that already have a transformer, one option is to swap out the existing transformer with one that has an additional secondary winding. The problem with this solution is that many systems now use transformers that are standard, off-the-shelf components, and most designers want to avoid replacing a standard, qualified transformer ...