The LM3407MYX is a step-down (buck) DC-DC regulator designed for driving LEDs with constant current. Manufactured by National Semiconductor (now Texas Instruments), this regulator is optimized for efficient and reliable LED lighting applications.

Applications

• LED lighting
• Automotive lighting
• Backlighting for displays
• General-purpose constant current sources
• Portable lighting devices

Features

• Constant Current Output: Precisely regulates current to drive LEDs at a consistent brightness level.
• Wide Input Voltage Range: Operates from a broad range of input voltages, accommodating various power sources.
• High Efficiency: Achieves high efficiency in converting input power to LED drive power, minimizing heat dissipation.
• Integrated MOSFET Switch: Includes an integrated power MOSFET switch for efficient switching.
• Internal Current Limiting: Protects the device and LEDs from overcurrent conditions.
• Thermal Shutdown Protection: Prevents damage from overheating by shutting down the device when excessive temperatures are detected.
• Adjustable Output Current: Allows for customizing the LED current through external resistors.

Benefits

• Consistent LED Brightness: Ensures stable and uniform LED brightness across a range of operating conditions.
• Energy Efficiency: Reduces power consumption and extends battery life in portable applications.
• Protection Features: Overcurrent and thermal protection enhance reliability and prevent damage.
• Compact Solution: Integrated design reduces the need for external components, saving board space.
• Versatile Use: Suitable for various LED lighting applications due to its adjustable output current.

Additional Details

The LM3407MYX is typically available in an 8-Pin MSOP package. Key electrical specifications include an input voltage range of 4.5V to 42V, an adjustable output current up to 1A, and a switching frequency up to 1 MHz. It also features a low shutdown current for extended battery life in portable devices. The device is commonly used in applications such as automotive lighting, display backlighting, and general-purpose LED drivers, providing a compact and efficient solution for constant current LED driving.