LM2574N-5.0 Datasheet PDF - National

●General Description

●The LM2574 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5A 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.

●Features

●■ 3.3V, 5V, 12V, 15V, and adjustable output versions

●■ Adjustable version output voltage range, 1.23V to 37V (57V for HV version) ±4% max over line and load conditions

●■ Guaranteed 0.5A output current

●■ Wide input voltage range, 40V, up to 60V for HV version

●■ Requires only 4 external components

●■ 52 kHz fixed frequency internal oscillator

●■ TTL shutdown capability, low power standby mode

●■ High efficiency

●■ Uses readily available standard inductors

●■ Thermal shutdown and current limit protection

●Applications

●■ Simple high-efficiency step-down (buck) regulator

●■ Efficient pre-regulator for linear regulators

●■ On-card switching regulators

●■ Positive to negative converter (Buck-Boost)