LM2576HV Series

The LM2576HV Series series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 3A load with excellent line and load regulation. These devices are avail- able in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version.

Requiringaminimumnumberofexternalcomponents,these regulators are simple to use and include internal frequency compensation and a fixed-frequency oscillator.

The LM2576HV Series series offers a high-efficiency replacement for popular three-terminal linear regulators. It substantially re- duces the size of the heat sink, and in some cases no heat sink is  required.

A standard series of inductors optimized for use with the LM2576HV Series are available from several different manufacturers. This feature greatly simplifies the design of switch-mode power supplies.

Other features include a guaranteed ±4% tolerance on out- put voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring 50 A (typical) standby cur- rent. The output switch includes cycle-by-cycle current limit- ing, as well as thermal shutdown for full protection under fault conditions.