The LM2574 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step−down switching regulator (buck converter). All circuits of this series are capable of driving a 0.5 A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3 V, 5.0 V, 12 V, 15 V, and an adjustable output version. These regulators were designed to minimize the number of external components to simplify the power supply design. Standard series of inductors optimized for use with the LM2574 are offered by several different inductor manufacturers. Since the LM2574 converter is a switch−mode power supply, its efficiency is significantly higher in comparison with popular three−terminal linear regulators, especially with higher input voltages. In most cases, the power dissipated by the LM2574 regulator is so low, that the copper traces on the printed circuit board are normally the only heatsink needed and no additional heatsinking is required. The LM2574 features include a guaranteed ±4% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency (±2% over 0°C to +125°C). External shutdown is included, featuring 60 μA (typical) standby current. The output switch in
The LM2574 series are monolithic step‑down (buck) switching regulators capable of delivering up to 0.5 A with high efficiency. They are offered in fixed output versions (3.3 V, 5 V, 12 V, 15 V) and an adjustable version covering 1.23 V to 37 V. The devices require only four external components and operate with a 52 kHz fixed‑frequency internal oscillator.
The datasheet provides detailed electrical characteristics, absolute maximum ratings, package dimensions, PCB layout guidelines, and ordering information. It also includes typical application circuits, performance graphs, and safety notes for automotive (NCV) and general‑purpose use.
| Output Current | 0.5 A |
|---|---|
| Input Voltage Range | 4.75 V to 40 V |
| Internal Oscillator Frequency | 52 kHz |
| Maximum Supply Voltage (Absolute) | 45 V |
The absolute maximum supply voltage is 45 V.
Only four external components are needed.
The regulator uses a 52 kHz fixed‑frequency internal oscillator.
The device guarantees a 0.5 A output current.