The LM4855IBL/NOPB is an integrated audio amplifier solution from Texas Instruments, designed to provide high-quality audio performance in portable applications. This versatile device combines a stereo headphone amplifier with a mono BTL (Bridge-Tied Load) output in a single package, making it an ideal choice for products where space is at a premium and audio quality is essential.

Key Features

• Dual Mode Operation: The LM4855 can operate in two modes - headphone (stereo) mode and speaker (mono) mode, allowing for flexibility in user applications.
• Power Efficiency: With its low-voltage operation and minimal power consumption, the LM4855IBL/NOPB is optimized for battery-powered devices, ensuring longer playback times.
• Advanced Pop & Click Circuitry: The device includes pop and click noise reduction circuitry which minimizes noise typically heard during power on and off cycles, providing a smoother audio experience.
• Thermal Shutdown Protection: Built-in thermal shutdown protection safeguards the device from damage that can occur from overheating.

Applications

The LM4855IBL/NOPB is suitable for a wide range of portable audio applications. This includes, but is not limited to:

• Mobile Phones
• Portable Media Players
• Handheld Gaming Devices
• Laptop and Notebook Computers
• Portable DVD Players

Technical Specifications

The amplifier operates over a wide power supply range from 2.2V to 5.5V, making it compatible with most standard battery technologies. It delivers 1.1W (typical) of continuous average power into an 8Ω BTL load with less than 1% distortion (THD+N) when powered by a 5V supply.

Quality and Reliability

The LM4855IBL/NOPB is offered in a micro SMD package and is characterized for operation over the temperature range of -40°C to 85°C. The "NOPB" suffix indicates that this product is offered in a lead-free package, reflecting Texas Instruments' commitment to environmental sustainability.

Ordering and Packaging

The device is available in a space-saving, 9-bump micro SMD package, ensuring a compact footprint for space-constrained applications. The LM4855IBL/NOPB is also RoHS compliant and is provided in tape and reel packaging for ease of manufacturing integration.