This document introduces LM2576 3.0 A, 15 V, step-down switching regulator.
The LM2576 series are monolithic step‑down (buck) switching regulators capable of delivering a guaranteed 3.0 A output current. Fixed output versions are available at 3.3 V, 5.0 V, 12 V and 15 V, plus an adjustable version covering 1.23‑37 V. The devices feature a 52 kHz fixed‑frequency internal oscillator, TTL shutdown capability, low‑power standby mode, and cycle‑by‑cycle current limiting with thermal shutdown protection.
Typical applications include high‑efficiency buck converters, pre‑regulators for linear regulators, on‑card switching supplies, and power supplies for battery chargers. The datasheet also includes PCB layout guidelines, package dimensions for TO‑220, D2PAK and D2PAK variants, and ordering information.
| Maximum Output Current | 3.0 A (guaranteed) |
|---|---|
| Maximum Supply Voltage (Vin) | 45 V |
| Fixed Output Voltage Options | 3.3 V, 5.0 V, 12 V, 15 V |
| Oscillator Frequency | 52 kHz (fixed) |
| Thermal Resistance, Junction‑to‑Ambient | 65 °C/W (TO‑220) |
The LM2576 guarantees a maximum output current of 3.0 A.
The device can tolerate a supply voltage up to 45 V, with a typical operating range up to 40 V.
Yes, it includes TTL shutdown capability and a low‑power standby mode.