The LM2576 series voltage regulator is a monolithic integrated circuit, ideal for the simple and convenient design of step-down switching regulators (step-down converters). All circuits in the series are capable of driving 3.0a loads with excellent line and load regulation capabilities. These devices are available in fixed output voltages of 3.3V, 5.0V, 12v, 15v and adjustable output versions.
Typical Application
These regulators are designed to minimize the number of external components to simplify the power supply design. The standard series of inductors optimized for the LM2576 are offered by several different inductor manufacturers. Because the LM2576 converter is a switch-mode power supply, its efficiency is significantly improved compared to popular three-terminal linear regulators, especially at higher input voltages.
Block Diagram
In many cases, the dissipated power is so low that a radiator is not needed, or its size can be greatly reduced. A standard series of inductors optimized for the LM2576 is available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.
Features of the LM2576 include a guaranteed tolerance of ±4% of the output voltage at specified input voltage and output load conditions, and an oscillator frequency of ±10% (0°C to 125°C±2%). Including external shutdown, with 80 A(typical) standby current. Output switches include cyclic current limiting, as well as hot shutdown, for full protection under failure conditions.
Maximum rated parameter
