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2574 / LM2574 / LM2574N-5.0 / LM2574N / voltage reg.
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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.
The LM2574 series offers a high-efficiency replacement for popular three-terminal linear regulators. Because of its high efficiency, the copper traces on the printed circuit board are normally the only heat sinking needed.
A standard series of inductors optimized for use with the LM2574 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 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.
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
Uses readily available standard inductors
Thermal shutdown and current limit protection
Simple high-efficiency step-down (buck) regulator
Efficient pre-regulator for linear regulators
Positive to negative converter (Buck-Boost)
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