LM2576 is a 3.0A, 15V step-down switching regulator produced by Semiconductor Components Industries. It has excellent line and load regulation characteristics, can work at fixed output voltages of 3.3V, 5.0V, 12V, 15V and adjustable output voltages, and has a high power conversion efficiency.
The LM2576 series are monolithic step‑down (buck) switching regulators capable of delivering up to 3.0 A with high efficiency. They are offered in fixed output versions (3.3 V, 5.0 V, 12 V, 15 V) and an adjustable version, and are designed to require only four external components.
The document provides maximum and operating ratings, electrical characteristics, typical performance curves, PCB layout recommendations, and package dimensions for TO‑220 and D2PAK packages. It also includes ordering information and application examples such as high‑efficiency power supplies and pre‑regulators for linear regulators.
| Maximum Output Current | 3.0 A |
|---|---|
| Maximum Supply Voltage (Vin) | 45 V |
| Fixed Oscillator Frequency | 52 kHz |
| Thermal Shutdown | Included |
The LM2576 can deliver a guaranteed output current of 3.0 A.
The device uses a fixed internal oscillator frequency of 52 kHz.
In many cases the power dissipated is low enough that no heatsink is required, or a much smaller heatsink can be used.