The LM4918LQ is a Boomer audio power amplifier capable of delivering 1.1W into an 8Ω speaker in BTL configuration. Manufactured by Texas Instruments (TI), formerly National Semiconductor, it's designed for portable audio applications requiring high power efficiency and minimal external components. This amplifier features a low-power shutdown mode, thermal shutdown protection, and click-and-pop suppression, making it ideal for mobile devices.

Applications

• Cellular phones
• Portable media players
• GPS devices
• Gaming consoles
• Laptop computers

Features

• BTL Configuration: Provides high output power with minimal external components.
• Low THD+N: Ensures high-quality audio reproduction with minimal distortion.
• Shutdown Mode: Reduces power consumption when not in use.
• Thermal Shutdown Protection: Prevents overheating.
• Click and Pop Suppression: Minimizes unwanted noise during power-up and power-down.
• Fixed Gain: Simplifies design and reduces external component count.

Benefits

• Efficient power utilization: Extends battery life in portable devices.
• High-quality audio: Delivers clear and distortion-free sound.
• Reliable operation: The built-in protection features ensure safe and stable performance.
• Reduced system cost: Minimizes the need for external components.
• Improved user experience: The click and pop suppression eliminates unwanted noise.

Technical Specifications

The LM4918LQ operates with a supply voltage range of 2.4V to 5.5V. It delivers 1.1W into an 8Ω speaker in BTL configuration with a THD+N of typically 1%. The device features a shutdown current of less than 1μA and is available in a LLP package. The amplifier has internal gain setting resistors, which reduce external components.