The LM4890LD is a Boomer series audio power amplifier from National Semiconductor (now Texas Instruments). It's designed to deliver high-quality audio output power into a speaker, primarily for portable and battery-powered applications. The LM4890LD features low power consumption, minimal external components, and a shutdown mode to conserve battery life, making it a popular choice for audio amplification in mobile devices.

Applications:

• Cellular phones
• PDAs
• Laptop computers
• Portable audio players
• Low-voltage audio systems

Features:

• Output power of 1W into 8Ω at 5V
• Low THD+N (Total Harmonic Distortion + Noise)
• Shutdown mode
• Short-circuit protection
• Thermal overload protection

Benefits:

• Provides loud and clear audio output even with limited power supply.
• Excellent audio fidelity ensures high-quality sound reproduction.
• Extended battery life due to low quiescent current and shutdown mode.
• Robust design prevents damage from short circuits and overheating.
• Simplified system design with minimal external components.

Specifications:

The LM4890LD can deliver 1W of continuous power into an 8Ω speaker with a 5V supply. It features a THD+N of typically 0.5% at 1W. The shutdown current is less than 1 μA. It is available in an 8-pin SOIC package. The operating voltage range is 2.0V to 5.5V. The gain can be adjusted externally with resistors. The input impedance is typically 30 kΩ.