The LM2579 is a pulse‑width‑modulated switching regulator controller that can be used in buck, boost, and inverting configurations. It features separate inverting and non‑inverting feedback inputs with a 1.0 V reference, an on‑board oscillator adjustable from <1 Hz to 100 kHz, and a maximum duty‑cycle of 90 %. The device can deliver up to 3 A output current with a collector saturation voltage below 0.75 V and supports emitter swing below ground for inverting applications.
The document lists absolute maximum ratings, detailed electrical characteristics, typical performance curves, and application information such as circuit‑board layout, diode selection, current‑limit transient suppression, and duty‑cycle adjustment methods. Example boost and inverting regulator circuits illustrate typical use cases.