A dual output regulator that uses only one inductor is discussed.
Dual output regulator
Many modern circuit designs still need a dual polarity supply. Communication and data acquisition are typical areas where both 5V and −5V are needed for some of the IC chips. It would be nice if a single switching regulator could supply both outputs with good regulation and a minimum of magnetic components. The circuit in Figure 104.1 is a good example of exploiting the best advantages of components and topologies to achieve a very small, dual output regulator with a single magnetic component.