Texas Instruments LM2674 40V to 5V 500mA Step-Down Regulator IC

The Texas Instruments LM2674 is a monolithic integrated circuit step-down (buck) switching regulator, engineered for high efficiency and simplicity of design. Built with an LMDMOS process, this regulator integrates all the necessary active functions to deliver a stable 5V output from an input voltage of up to 40V, with a guaranteed load current of 500mA. It offers excellent line and load regulation, making it a reliable choice for a wide range of power conversion applications.

A key advantage of this regulator is its high efficiency, which can reach up to 96%, helping to minimise power loss and heat generation in compact designs. The device incorporates a low 0.25Ω DMOS output switch and a fixed-frequency internal oscillator running at 260kHz, contributing to its stable and predictable performance. For power management, it features TTL-compatible shutdown capability, allowing the IC to enter a low-power standby mode when not in active use, which is ideal for battery-powered devices.

Primary Features & Benefits

• High Efficiency: Up to 96% efficiency optimises power usage and reduces thermal management requirements.
• Simple Design: Requires minimal external components, simplifying circuit board layout and reducing overall system cost.
• Precise Regulation: Offers a tight ±1.5% maximum output voltage tolerance across varying line and load conditions for consistent performance.
• Robust Output: An ensured 500mA output current provides reliable power for peripherals and subsystems.
• Power Management: TTL shutdown capability enables external control to enter a low-power standby state.
• Compact Form Factor: Supplied in a space-saving 8-pin SOIC surface-mount package, suitable for modern, dense PCB designs.

With its combination of a wide input voltage range, high efficiency, and integrated features, the LM2674 is an excellent solution for point-of-load power,