The LM2575 series of regulators are monolithic integrated circuits that provide all the
active functions for a step-down (buck) switching regulator, capable of driving a 1A load with
excellent line and load regulation. These devices are available in fixed output voltages of 3.3V,
5V, 12V, 15V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and
include internal frequency compensation and a fixed-frequency oscillator.
The LM2575 series offers a high-efficiency replacement for popular three-terminal linear
regulators. It substantially reduces the size of the heat sink, and in many cases no heat sink is
A standard series of inductors optimized for use with the LM2575 are available from
several different manufacturers. This feature greatly simplifies the design of switch-mode power
Other features include a specified ±4% tolerance on output voltage within specified input
voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is
included, featuring 50 μA (typical) standby current. The output switch includes cycle-by-cycle
current limiting, as well as thermal shutdown for full protection under fault conditions.
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