The LM2576 series are 3A, 52kHz fixed-frequency step-down (buck) switching regulators available in SMD packages (typically TO-263) for efficient voltage regulation, replacing linear regulators. They offer fixed (3.3V, 5V, 12V, 15V) or adjustable outputs, up to 40V/60V (HV version) input voltage, high efficiency (80%), and built-in thermal/current protection