Product Overview: LM4990 Audio Amplifier

The LM4990 from Texas Instruments is an advanced audio power amplifier capable of delivering high-quality sound. Designed for portable and space-constrained applications, it provides a robust audio solution for a range of products, including mobile phones, tablets, laptops, and other personal electronics. The LM4990 is a testament to Texas Instruments' commitment to integrating innovation with functionality, offering both power efficiency and sound fidelity.

Key Features

• Output Power: The LM4990 can deliver up to 1 watt of continuous average power to an 8-ohm load with less than 1% distortion (THD+N) from a 5V DC power supply, making it suitable for a variety of audio applications.
• Efficiency: Its high efficiency significantly reduces heat generation and extends battery life in portable applications.
• Shutdown Mode: The amplifier includes a shutdown function that reduces the quiescent current to less than 1 microamp, further conserving energy when the amplifier is not in use.
• Advanced Pop & Click Circuitry: This feature ensures that no audible transients are generated on the speaker outputs during power-up or shutdown.
• Micro-SMD Package: The LM4990 is available in a space-saving micro-SMD package, which is ideal for applications where space is at a premium.

Performance Specifications

With a wide supply voltage range from 2.2V to 5.5V, the LM4990 can easily be integrated into various circuit designs. It has a PSRR (Power Supply Rejection Ratio) of 70dB at 217Hz, which helps to maintain signal fidelity by minimizing noise and interference from fluctuating power supplies. The device also features a low THD+N, ensuring clear and clean audio output, and a fast turn-on time, which makes it responsive and suitable for quick-start applications.

Applications

The versatility of the LM4990 makes it an ideal choice for a multitude of applications that require high-quality audio amplification in a compact form factor. It is especially well-suited for portable electronic devices, but can also be used in other audio systems where space and power efficiency are critical considerations.