LM4873MTE-1

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LM4873MTE-1, which belongs to the category of Linear - Amplifiers - Audio and is a Qualcomm company\'s product, is a small low-power, stereo audio power amplifier released by Qualcomm in 2010. It consists of two fully independent audio power amplifier circuits, which can be used to drive two voice coil loudspeakers, two headsets, and an audio system. It can provide 1.76W load power to two channels and can also be used to drive a 4 ohm Tweeter to obtain up to 4.15W output power.

The LM4873MTE-1 integrated circuit integrates several features into a small surface mount package, including an enable/shutdown control, overcurrent and thermal shutdown protection, to enable the system to run for a long time without risk, as well as independent volume control for each channel. In addition, this audio amplifier chip supports a wide supply voltage range from 2.5V to 5.5V.

LM4873MTE-1 works in accordance with a push-pull Class AB architecture, which is a combination of the Class A and Class B architectures. In Class A topology, the output devices are biased to pass the full input signal. This can be viewed as a classification of power amplifier design, which is different from the Class B amplifier, whose output components only half of the input signal. Class B amplifiers consume more power than Class A amplifiers, but they can produce more output power. In the Class AB application, the input device biasing is designed in such a way that it produces enough output power to ensure low distortion, but still consumes little more power than the Class A amplifier.

The LM4873MTE-1 features a fully independent input MUX with five inputs and two stereo outputs, and a mute control[IV1] , which can be used to reduce the system to its minimum power consumption state. In addition, it has a fixed gain of 26 dB and a built-in thermal shutdown circuit with an adjustable temperature limit of from 50 degrees Celsius to 85 degrees Celsius. Its clickless mute/shutdown input eliminates the unpleasant noise generated when entering and exiting low power mode. Its low distortion level guarantees a high-quality sound. The maximum output power of this audio amp can reach 1.76 W at 4 ohms per channel, and the THD+N at this output power is less than 0.1%.

In conclusion, LM4873MTE-1 is a five-input, two-channel, low-power, stereo audio amplifier integrated circuit released by Qualcomm in 2010. Its unique output architecture and wide supply voltage range make it ideal for embedded applications such as smart phones, portable audio players, PDAs and handheld games. Its integrated mute/shutdown feature, thermal overload protection, and low voltage operation make it suitable for long-term operation of portable audio products. It can drive two channels with a maximum power of 1.76 watts at 4 ohms and offer excellent sound quality.

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