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

The Texas Instruments LM2674 is a 500mA step-down regulator IC that delivers a stable 5V output from an input voltage of up to 40V.

Overview

The LM2674 is a monolithic integrated circuit step-down (buck) switching regulator designed for high efficiency and simplicity of design. Built with an LMDMOS process, it integrates the active functions needed for regulation and offers excellent line and load regulation for a wide range of power conversion applications.

Performance

The device uses a low 0.25Ω DMOS output switch and a fixed-frequency internal oscillator running at 260kHz, supporting stable and predictable operation. Its efficiency can reach up to 96%, which helps minimise power loss and heat generation in compact designs. TTL-compatible shutdown allows the IC to enter a low-power standby mode when not in active use, which suits battery-powered devices.

Key Features

• Wide input voltage range of up to 40V
• High efficiency of up to 96%
• Precise regulation with a ±1.5% maximum output voltage tolerance across varying line and load conditions
• 500mA output current for peripherals and subsystems
• TTL-compatible shutdown for external control of a low-power standby state
• Minimal external components required, simplifying circuit board layout
• Supplied in a space-saving 8-pin SOIC surface-mount package suitable for dense PCB designs

Physical Details

The device measures 3.3 (width) x 1.5 (depth) x 4.3 (height) and weighs 0.173 g.

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