LM4865MM

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The LM4865MM, produced by National Semiconductors, is an audio power amplifier intended primarily for driving small speakers in mobile phones, personal computers, and other portable audio devices. This low-noise amplifier is also suitable for driving headphones, with a maximum power output of 1.6 watts into a 4 ohm load. The LM4865MM is available in a space-saving 3-lead TO-SOT (TSSOP) package.

The LM4865MM is a low-power, low-noise audio power amplifier designed to bring maximum power and audio quality in a minimal form-factor. It can deliver up to 1.6 Watts of power while maintaining a low-noise output. The device is based on a dual gain-stage architecture, with the first stage providing 10dB of gain and the second offering an adjustable maximum gain of 21dB. It employs a feedback loop, which helps to maintain a constant level of output power at all times.

The LM4865MM uses two voltage regulators to provide a consistent voltage to the audio signals. This helps it to maintain a higher level of performance while also helping to reduce power consumption. The maximum voltage applied to the audio input is 2.5V, and there is also a separate power supply for the gain control. The power supply has a range of 4.5V to 16V, allowing for easy operation over a wide range of voltage sources.

In addition to its power and audio benefits, the LM4865MM features other features, such as thermal protection, shutdown and soft-start functions, and SpeakerGuard protection. Its thermal protection helps to prevent damage from excessive heat buildup. Its shutdown feature allows for automatic or manual shutdown of the audio amplifier in order to save power. The SpeakerGuard protection helps to prevent damage in the event of an excessive audio signal.

The LM4865MM is highly efficient, with an average power efficiency of 91%. This results in less power being wasted as heat. The audio performance of the LM4865MM is equally impressive, with a 1% THD+N rating of -77dB and a total harmonic distortion (THD) of 0.006% at 1 Watt. The amplifier also has a wide frequency response range, of 20Hz - 20KHz (-1dB).

The LM4865MM is an ideal audio amplifier for any application requiring a small form-factor, high efficiency, low-noise, and high-quality audio performance. It is a perfect choice for any audio application from mobile phones to computers, delivering great sound and excellent power efficiency.

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