The LM2574HVMX-15, from Texas Instruments, is a monolithic integrated circuit designed for use as a simple and efficient step-down (buck) voltage regulator. This versatile component is capable of driving a 0.5A load with excellent line and load regulation. The fixed output voltage version of 15V makes it convenient for applications where a regulated supply is needed from higher voltage sources.

Key Features

• Output Voltage: Fixed 15V
• Output Current: 0.5A
• Voltage Input Range: 4V to 60V
• Efficiency: Up to 77% at 15V output
• Switching Frequency: 52 kHz fixed frequency internal oscillator
• Thermal Shutdown and Current Limit Protection: Ensures safe operation under abnormal conditions
• Package: Surface-mount SOP-14

The LM2574HVMX-15 integrates all the active functions required for a step-down (buck) switching regulator. Designed to minimize the number of external components, it simplifies the power supply design process, making it ideal for space-constrained applications.

The device features a standard circuit architecture that includes a stable 52 kHz oscillator, a temperature-compensated reference, a high-gain error amplifier, a current-limiting circuit, and a high-current output switch. This architecture, combined with the use of a few external components, can deliver significant advantages in terms of size and thermal performance.

With its wide input voltage range and ability to operate efficiently over a temperature range of -40°C to +125°C, the LM2574HVMX-15 is suitable for a variety of applications, including on-board regulation for elimination of noise and distribution problems associated with single-point regulation. Its robust design ensures performance reliability and longevity, making it a preferred choice for industrial, automotive, and consumer electronics markets.

Applications: The LM2574HVMX-15 is commonly used in simple low-power DC-DC converters, wall transformers, distributed power supply systems, and as a pre-regulator for linear regulators.