The LM2644MTC is a simple to use step-down (buck) voltage regulator manufactured by National Semiconductor (now Texas Instruments). It is capable of driving a 3A load with excellent line and load regulation. Requiring a minimum number of external components, the LM2644MTC is both easy to use and available in a space-saving MSOP package.

Applications:

• Point of Load regulation
• High Efficiency Step-Down Conversion
• Portable Electronics
• Hard Disk Drives
• DVD Players

Features:

• 3A Output Current Capability
• Wide Input Voltage Range: 4.5V to 26V
• Fixed Output Voltage Options: 3.3V, 5V
• Adjustable Output Voltage Option
• High Efficiency: Up to 90%
• Integrated Synchronous Rectification
• Internal Current Limiting
• Thermal Shutdown Protection
• Over Voltage Protection

Benefits:

• Simplified Design: Requires few external components
• High Efficiency: Maximizes battery life and minimizes heat dissipation
• Robust Protection: Protects the regulator and the load from fault conditions
• Compact Size: Space-saving MSOP package
• Stable Output Voltage: Ensures reliable operation of downstream devices

Technical Specifications:

The LM2644MTC can accept an input voltage from 4.5V to 26V. The switching frequency is typically 500kHz. It offers both fixed and adjustable output voltage options. The output current capability is 3A. Efficiency can reach up to 90%, depending on the input voltage and load current. The device integrates synchronous rectification, current limiting, thermal shutdown, and over-voltage protection to enhance reliability. Available in a thermally enhanced MSOP package, the operating temperature range is typically -40°C to +125°C.

The device is a suitable option for a wide array of step-down applications requiring high efficiency, robustness, and compact size. Its integrated protection features and ease of use make it a suitable choice for point-of-load regulation in various electronic systems.