The LM2576 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step–down switching regulator (buck converter). All circuits of this series are capable of driving a 3.0 A load with excellent line and load regulation.
The LM2576 series are monolithic step‑down (buck) switching regulators capable of delivering up to 3 A with excellent line and load regulation. They are offered in fixed 3.3 V, 5 V, 12 V, 15 V versions and an adjustable version covering 1.23 V to 37 V. The devices require only four external components, feature a 52 kHz internal oscillator, and include thermal shutdown and cycle‑by‑cycle current limiting.
Typical applications include high‑efficiency power supplies, pre‑regulators for linear regulators, on‑card switching supplies, and positive‑to‑negative converters. The datasheet provides detailed electrical characteristics, absolute maximum ratings, typical performance curves, and PCB layout guidelines to help designers achieve optimal efficiency and low EMI.
| Maximum Output Current | 3.0 A |
|---|---|
| Maximum Supply Voltage (Vin) | 45 V |
| Fixed Output Voltages | 3.3 V, 5.0 V, 12 V, 15 V |
| Adjustable Output Voltage Range | 1.23 V to 37 V |
| Internal Oscillator Frequency | 52 kHz |
| Thermal Resistance (J‑to‑A, TO‑220) | 65 °C/W |
In many cases no heatsink is required because the power dissipation is low.