LM4873MTEX-1

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The LM4873MTEX-1 from Texas Instruments is an Audio Power Amplifier. It is a dual-channel filterless Class-D audio power amplifier with integrated boost converters and is built from a CMOS process. The device is capable of delivering 4 watts per channel of Class-D audio output power into a 4Ω load at a 6V supply rail, making it ideal for use in portable devices. The device has an Integrated boost converter, enabling a single 6V supply to be used. The integrated boost converter allows the LM4873MTEX-1 to reproduce acoustic details without colorizing the audio and is able to produce levels as low as 0.35W. The LM4873MTEX-1 can be paired with another IC, such as the LM4871, to provide a complete audio amplification solution in a single package.

The LM4873MTEX-1 is designed with a low output noise of 50 μV RMS. Its integrated boost converter maintains power accuracy to within ±3%, allowing it to reproduce audio details while keeping noise to a minimum. The device has variable gain with a fixed ramp rate, allowing the user to adjust the gain from 0dB to 6dB, in 0.2 dB increments. It also features a low current shutdown mode which will shut down both channels when the disabled input state is recognized. This improves efficiency by reducing power consumption when the amplifier is not in use.

The LM4873MTEX-1 provides an adjustable soft start that protects speakers from high inrush current. The device also offers an adjustable thermal overload protection circuitry to ensure a safe operating environment. This protection prevents over-temperature conditions and helps maximize system performance in demanding applications. The LM4873MTEX-1 is also equipped with an overtemperature shutdown feature which will shut down the device when the die temperature exceeds a designed threshold.

The LM4873MTEX-1 is designed to provide high efficiency, long battery life, and low distortion for audio applications in media players, portable speakers, and other consumer electronics. The device is available in a single TSOT-23 package, making it easy to integrate into small form factor designs. The LM4873MTEX-1 is also lead-free and RoHS compliant, making it suitable for applications where environmental compliance is necesssary.

In summary, the LM4873MTEX-1 from Texas Instruments is a dual-channel audio power amplifier with integrated boost converter. It provides 4 watts per channel of Class-D audio output power into a 4Ω load at a 6V supply rail, making it ideal for portable devices. The device features adjustable gain, variable gain with a fixed ramp rate, adjustable soft start, and integrated temperature protection. It is available in a single TSOT-23 package and is RoHS compliant, making it a great choice for small form factor applications.

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