The LM4863M is a bridged audio power amplifier primarily designed for portable electronic devices. Manufactured by National Semiconductor (now Texas Instruments), it is capable of delivering 2.2W per channel into a 4Ω load with low total harmonic distortion plus noise (THD+N). The LM4863M is specifically designed for high-quality audio reproduction in battery-powered devices.

Applications:

• Laptop computers
• Portable DVD players
• Cell phones
• Gaming devices
• Portable audio players

Features:

• Bridged-Tied Load (BTL) configuration
• Output power: 2.2W per channel into 4Ω
• Low THD+N at 1kHz
• Shutdown mode for power saving
• Internal thermal shutdown protection
• Click and pop suppression circuitry

Benefits:

• High output power for clear and loud audio in portable devices
• Low distortion for high-quality audio reproduction
• Extended battery life due to efficient Class AB operation and shutdown mode
• Protection against overheating damage
• Reduced audible artifacts during power-up and power-down

Technical Specifications:

• Output Power (4Ω, 10% THD+N): 2.2W per channel
• THD+N (1W, 1kHz): 0.3% (typical)
• Supply Voltage: 2.0V to 5.5V
• Shutdown Current: 0.7μA (typical)
• Operating Temperature: -40°C to +85°C

The LM4863M utilizes a bridged-tied load (BTL) configuration, which allows it to deliver significantly more power to the load compared to a single-ended amplifier operating at the same supply voltage. This is achieved by driving the load differentially, with each amplifier output swinging in opposite directions. The device also incorporates internal protection features, such as thermal shutdown, to prevent damage from overheating. The integrated click and pop suppression circuitry minimizes audible artifacts during power-up and power-down, further enhancing the user experience. Its compact size and low power consumption make it ideal for portable audio applications.