Microchip Technology, Inc. Voltage Regulators - DC DC Switching Regulators LM2576WT

The LM2576WT is a monolithic integrated circuit designed for step-down (buck) switching regulation. It supports fixed output voltages of 3.3V, 5V, or 12V, and offers an adjustable version with an output voltage range from 1.23V to 37V. This regulator can deliver a maximum output current of 3A while maintaining excellent line and load regulation. The device operates with a wide input voltage range of 4V to 40V and features a fixed-frequency internal oscillator operating at 52kHz. It requires only four external components for operation, simplifying the design of switch-mode power supplies. The LM2576WT is noted for its high efficiency, typically exceeding 80%, which reduces the need for large heat sinks, and in many cases, eliminates the need for any heat sink at all. Protection features include thermal shutdown and cycle-by-cycle current limiting, ensuring reliable operation under fault conditions. The device is available in a TO-220 package and is suitable for various applications, including efficient pre-regulators for linear regulators and on-card switching regulators.