LM4871MX

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LM4871MX is an audio amplifier device which provides updated features, high power, small size, and low power consumption, making it ideal for use in portable and mobile audio applications as well as home theater systems. It is a linear type of amplifier, which means that it amplifies the input signals without introducing distortion. The LM4871MX is a low-noise audio power amplifier that can be used to drive up to three stereo speakers simultaneously, allowing for a system with true surround sound capabilities.

The LM4871MX is designed to use a low number of external components, requiring only a single MOSFET and two bias resistors, which permits simple, low-cost designs. The device is virtually drop-in compatible, offering a simple replacement solution for traditional analog amplifiers. The LM4871MX also features low power supply noise rejection, making it suitable for audio systems powered from batteries and other unreliable sources.

Application Field

The LM4871MX is designed for use in home theater systems and mobile audio applications, offering greater integration and using fewer components than other amplifiers. It can be used to drive up to three stereo speakers simultaneously, allowing for true surround sound capabilities. The device is also suitable for portable applications, including cellular phones and portable media players, due to its low power consumption and small size.

Working Principle

The LM4871MX operates on a basic amplifier principle, where input signals are amplified to produce greater voltage and current outputs. It operates on a Class-AB linear amplifier architecture, which allows for distortion-free amplification of the signals and a wide control range. Additionally, the device can operate on either dual-rail or single-rail supply voltage configurations, depending on the application.

The LM4871MX features a low-noise power supply, which helps to reduce the effects of noise and reduce crossover distortion. Additionally, the device features an EDM (electronic feedback) output pin, which provides an adjustable voltage feed-forward to adjust output gain and accuracy. The EDM pin can also be used as a mute control, allowing direct selection of mute functionality.

Finally, the device utilizes a current-sense technique to provide maximum output power and protection from most overload conditions. The current-sense feature monitors the current used by the output devices and adjusts the voltage to maintain a consistent output current level.

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