LM4991MAX/NOPB

The LM4991MAX/NOPB is a high-performance audio amplifier integrated circuit (IC) produced by Texas Instruments. It is designed for use in portable audio applications, such as smartphones, tablets, and other battery-operated devices, where efficiency and sound quality are paramount.

Key Features:

1. Class D Amplifier: The LM4991MAX/NOPB operates as a Class D amplifier, which means it uses pulse-width modulation (PWM) to achieve high efficiency. This allows it to deliver significant power output while minimizing heat generation, making it ideal for battery-powered applications.

2. Output Power: The amplifier can deliver up to 2.5W of output power per channel into a 4-ohm load, and up to 1.5W into an 8-ohm load. This makes it suitable for driving small speakers or headphones.

3. Low Quiescent Current: The device features a low quiescent current, which helps extend battery life in portable applications. This is particularly important for devices that require long operational times between charges.

4. Integrated Features: The LM4991MAX/NOPB includes several integrated features such as a built-in thermal shutdown protection, short-circuit protection, and a mute function. These features enhance the reliability and safety of the amplifier in various operating conditions.

5. Power Supply Range: It operates over a wide power supply range, typically from 2.5V to 5.5V, allowing it to be used in a variety of applications with different voltage requirements.

6. Compact Package: The IC is available in a small, surface-mount package (such as the VQFN), which is advantageous for space-constrained designs. Its compact size makes it easy to integrate into modern electronic devices.

7. High Efficiency: The amplifier boasts high efficiency ratings, often exceeding 90%, which is crucial for minimizing power loss and heat generation, especially in portable devices.

8. Audio Performance: The LM4991MAX/NOPB is designed to deliver high-quality audio performance with low total harmonic distortion (THD) and a wide frequency response, ensuring clear and accurate sound reproduction.

9. Application Versatility: It is suitable for a variety of applications beyond portable audio, including televisions, computer speakers, and other consumer electronics that require efficient audio amplification.

Applications:

• Portable audio devices (smartphones, tablets)
• Bluetooth speakers
• Computer audio systems
• Television audio amplification
• Other consumer electronics requiring efficient audio output

Conclusion:

The LM4991MAX/NOPB from Texas Instruments is a versatile and efficient audio amplifier IC that meets the demands of modern portable audio applications. Its combination of high output power, low quiescent current, and integrated protection features make it an excellent choice for designers looking to enhance audio performance while maintaining battery efficiency.