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The Texas Instruments LM4861MX is a Class-AB audio power amplifier designed for high-quality output with minimal external components. It delivers 1.1W of continuous average power to an 8Ω load with 1% THD+N when powered by a 5V supply.
This amplifier features an analog input and supports mono speaker output. It operates within a wide analog supply voltage range of 2V to 5.5V and a power stage supply range of 2V to 5.5V. The device includes an externally controlled, low-power shutdown mode and internal thermal shutdown protection.
Designed for low-power portable systems, the LM4861MX does not require output coupling capacitors, bootstrap capacitors, or snubber networks. It is housed in a Small Outline (SOIC) package, making it compatible with PC power supplies. The amplifier is unity-gain stable and offers external gain configuration capability.
Key electrical specifications include a typical output power of 1.5W at 10% THD+N (1kHz into 8Ω) and a THD+N of 0.72% at 1kHz. The shutdown current is typically 0.6μA. The operating temperature range is -40°C to 85°C.
The LM4861MX delivers 1.5W typical output power into an 8Ω load at 10% THD+N, and 1.0W maximum at 1% THD+N.
The analog and power stage supply voltage range is 2V to 5.5V.
The operating temperature range is -40°C to 85°C.
The LM4861MX is available in an 8-pin SOIC (D) surface-mount package.
The typical shutdown current is 0.6μA.
The audio input type is analog.