The LM2576 series voltage regulator is a monolithic integrated circuit, ideal for simple and convenient design of step-down switching voltage regulators (step-down converters). All circuits in the series are capable of driving 3.0a loads with excellent line and load regulation capabilities.
Typical Application
These devices are available in fixed output voltage 3.3V, 5.0V, 12v, 15v and adjustable output versions. 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.
Functional block diagram
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. 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 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 output voltage at specified input voltage and output load conditions, and a ±10% oscillator frequency (0°C to 125°C±2%). Including external shutdown, with 80 A(typical) standby current. Output switches include cyclic current limiting, as well as thermal shutdown, for full protection under failure conditions.
