LM2574N-12

Updated: 2026-07-15

Overview

The LM2574N-12 is a monolithic integrated circuit designed for step-down (buck) voltage regulation, providing a fixed 12V output. It is part of the LM2574 series by Texas Instruments, renowned for its simplicity and efficiency in power supply designs. This regulator is ideal for applications requiring a stable 12V supply from a higher input voltage, such as automotive systems, industrial controls, and consumer electronics. Its compact TO-263 package makes it suitable for space-constrained designs while delivering up to 0.5A of output current.

Structure and Working Principle

The LM2574N-12 integrates a power switch, oscillator, control circuitry, and protection features into a single chip. It operates by rapidly switching the input voltage on and off, then filtering the output to maintain a steady 12V. Key components include an internal 52kHz oscillator, a feedback loop for voltage regulation, and protection mechanisms like thermal shutdown and current limiting. The device requires minimal external components, typically just an inductor, diode, and capacitors, simplifying circuit design.

Key Features

The LM2574N-12 offers high efficiency (up to 80-90%), reducing heat generation and power loss compared to linear regulators. Its fixed 12V output eliminates the need for external voltage dividers, streamlining design. Additional features include thermal shutdown to prevent overheating, current limiting for overload protection, and a wide input voltage range (4.75V to 40V). These attributes make it a robust choice for demanding environments.

Application Areas

This regulator is commonly used in automotive electronics, such as infotainment systems and lighting controls, where stable 12V power is critical. Industrial applications include PLCs, motor drives, and instrumentation. Consumer electronics, like routers and set-top boxes, also benefit from its compact size and efficiency. Its versatility and reliability make it a staple in B2B procurement for power supply solutions.

Maintenance and Precautions

To ensure longevity, provide adequate heat sinking, especially in high-temperature environments. Follow the manufacturer's PCB layout guidelines to minimize noise and improve efficiency. Avoid exceeding the maximum input voltage (40V) or output current (0.5A). Regularly inspect for signs of overheating or component degradation, particularly in high-vibration applications like automotive systems.

B2B Procurement Guide

When sourcing the LM2574N-12, verify the supplier's authenticity to avoid counterfeit parts. Texas Instruments and authorized distributors are recommended for guaranteed quality. Consider bulk purchasing for cost savings, but ensure storage conditions (dry, temperature-controlled) to prevent moisture damage. Lead times may vary, so plan procurement in advance for large-scale projects.