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)
