LM2576-ADJ Stepˆ’Down Switching Regulator (SMD)

The LM2576 regulators are monolithic integrated circuits ideally suited for the easy and convenient design of a step–down switching regulator (buck converter). The circuit can drive a 3.0 A load with excellent line and load regulation. The device is available in an adjustable output version. The regulator minimises the number of external components to simplify the power supply design.  Several different inductor manufacturers offer standard series of inductors optimised for use with the LM2576.

Since the LM2576 converter is a switch-mode power supply, its efficiency is significantly higher than the popular three-terminal linearregulators, especially with higher input voltages.

The LM2576 features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions and ±10% on the oscillator frequency (±2% over 0°C to 125°C). External shutdown is included, featuring 80 A (typical) standby current. The output switch includes cycle−by−cycle current limiting and thermal shutdown for full protection under fault conditions.

Pin Configuration

Pin Number

Pin Name

Description

1

VIN

The voltage which has to be regulated is provided as input to this pin

2

Output

The regulated output can be obtained through this pin

3

Ground

Connected to system ground

4

Feedback

This pin is provided with the feedback voltage based on which the output is regulated

5

ON/OFF

Connect to the ground to activate the regulator or connect to Vcc to disable the regulator.

Features

Applications