The LM49151TLX is a high-efficiency audio amplifier with integrated boost converter, manufactured by Texas Instruments (formerly National Semiconductor). It's designed for portable audio applications, providing high-quality audio amplification while maximizing battery life. The integrated boost converter allows the amplifier to deliver higher output power even with low battery voltages.

Applications

• Mobile Phones: Powering loudspeakers or headphones for audio playback.
• Portable Media Players: Amplifying audio signals for music and video playback.
• Tablets: Providing audio output for multimedia content.
• Gaming Consoles: Amplifying audio for game sound effects and music.
• Bluetooth Speakers: Powering the speaker drivers in portable Bluetooth speakers.

Features

• Integrated Boost Converter: Boosts the battery voltage to provide a higher supply voltage for the amplifier, enabling higher output power.
• High Efficiency: Class D amplifier design minimizes power consumption and maximizes battery life.
• Low Noise and THD+N: Delivers high-quality audio with minimal distortion and noise.
• Speaker Protection: Includes speaker protection circuitry to prevent damage from overcurrent or overvoltage conditions.
• Short Circuit Protection: Protects the amplifier from damage due to short circuits.
• Thermal Shutdown Protection: Prevents overheating and potential damage to the amplifier.
• Gain Select: Allows for adjusting the amplifier's gain to match different input signal levels.

Benefits

• Extended Battery Life: High efficiency and integrated boost converter contribute to extended battery life.
• High-Quality Audio: Low noise and distortion provide a clear and enjoyable listening experience.
• Speaker Protection: Protects speakers from damage, ensuring long-term reliability.
• Simplified Design: Integrated features reduce the need for external components, simplifying system design.

Additional Details

The LM49151TLX has adjustable gain settings. It can drive speakers with impedances as low as 4 ohms. It uses a Class D modulation scheme for highly efficient power conversion. The boost converter's switching frequency is typically optimized to minimize EMI. The datasheet specifies the output power capabilities at various supply voltages and load impedances. Detailed performance characteristics, including THD+N versus output power, are available in the product datasheet. It typically operates from a 2.7V to 5.5V supply voltage.