The LM34904ATMX is a 4.5V to 40V, 1A synchronous step-down voltage regulator from Texas Instruments (TI), formerly National Semiconductor. It is designed to provide a highly efficient and compact power conversion solution for a variety of applications. The regulator integrates all necessary functions for a step-down (buck) switching regulator into a small package, minimizing external components and simplifying design. It features a wide input voltage range and is capable of delivering up to 1A of output current.

Applications

• Automotive power supplies
• Industrial power systems
• Point-of-load regulators
• Battery-powered systems
• Distributed power architectures

Features

• Wide Input Voltage Range: Operates from 4.5V to 40V input.
• 1A Output Current: Delivers up to 1A of continuous output current.
• Synchronous Rectification: Improves efficiency by using a MOSFET instead of a diode for rectification.
• Internal Compensation: Simplifies design and reduces external component count.
• Over-Current Protection: Protects the regulator and load from over-current conditions.

Benefits

• High Efficiency: Synchronous rectification minimizes power loss and improves energy efficiency.
• Compact Solution: Small package size and integrated features reduce board space requirements.
• Simplified Design: Internal compensation and minimal external components simplify design process.
• Robust Protection: Over-current protection ensures reliable operation.
• Versatile Application: Suitable for a wide range of power supply applications.

Additional Details

The LM34904ATMX operates at a fixed switching frequency, typically in the range of 500kHz to 2MHz, offering a good balance between efficiency and component size. It features a thermal shutdown function to prevent overheating and damage. The device is available in a thermally enhanced package to improve heat dissipation. It is also RoHS compliant. The integrated design and protection features make this regulator a reliable and easy-to-use solution for many power supply requirements.