LM4862MX

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Audio amplifiers are devices designed to take an input audio signal and make it powerful enough to use in an audio system, such as a speaker or a headset. LM4862MX is a monolithic audio power amplifier that combines the advantages of a low parts count single sided system with a moderate power amplifier output stage. It delivers a maximum of 2.5W output power in stereo mode. In this article, we will explore the application field and working principle of LM4862MX.

Functionalities

The LM4862MX is primarily intended for battery-powered operation and applications that require low voltage supplies and low frequency response. It features a low THD+N and low output noise. The device is also available in a Shutdown mode, which shuts down both channels and reduces the standby power consumption to less than 200μW. Additionally, some key features of the device include:

• Low parts count single sided system
• Operates from 2.7 to 5.5 V supply voltage
• Very low THD+N, 0.067% at Vs=2.7V and PO=1W, RL=8Ω
• Low output noise, 2.9μV RMS from 0Hz to 20kHz bandwidth
• Improved click-and-pop suppression

Application Field

The LM4862MX offers an ideal solution for portable and battery-powered systems. It is suitable for driving 8Ω and 10Ω loads with an efficiency as high as 78%. It is commonly used in portable radios, MP3 players, small stereo speakers, mobile phones and other mobile devices. Due to its low noise, high efficiency and low parts count, the device is also suitable for Bluetooth headsets, hearing aids and other low voltage, low power applications.

Pin Configuration

The LM4862MX features seven pins including a power enable pin, a shutdown pin and five signal pins. The Power Enable pin is connected to high voltage supply to enable the amplifier. The Shutdown pin is connected to GND to disable the amplifier. The output pin is connected to the load or speaker. The GND pin is connected to the ground of the circuit. The other two pins are the left and right input pins for receiving the input audio signal.

Working Principle

The LM4862MX is a monolithic audio power amplifier, with the two channels operating independently. It is capable of driving 8Ω and 10Ω loads with an efficiency of up to 78%. The device has an open loop gain of 30dB, and a maximum differential input voltage of 0.55V. The LM4862MX has integrated thermal protection circuitry, which shuts off the amplifier to prevent damage due to overheating. The device also has an output protection circuitry, which guards against shorts and open circuit loads. Additionally, the device incorporates click and pop suppression circuitry, which reduces the chances of audible clicks and pops.

The LM4862MX takes an input audio signal and amplifies it by raising the voltage and current of the signal. The amplified signal is then sent to the speaker to drive it. The amplifier circuitry enables the device to provide flat audio frequency response, low distortion, low noise and high efficiency.

Conclusion

The LM4862MX is a low power audio amplifier that offers a low parts count single sided system with a moderate power output stage. It is ideal for battery-powered applications and provides flat audio frequency response, low distortion, low noise and high efficiency. In this article, we have explored the application field, pin configuration and working principle of LM4862MX.

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