LM4811LD

Audio Amplifiers Overview

The LM4811LD is a dual-channel stereo Class-AB audio amplifier designed for headphone applications. It delivers 105 mW of output power into a 16 Ohm load with a total harmonic distortion plus noise of 0.3%. The device operates on a single supply voltage ranging from 2 V to 5.5 V. It features integrated digital volume control, pop suppression, and thermal protection. The component is housed in a 10-pin VSSOP package.

Audio Amplifiers Feature Summary

• Integrated digital volume control circuit for precise audio level adjustment
• Pop and click suppression mechanisms to minimize audible transients during power-up and shutdown
• Thermal protection circuitry to safeguard the device under fault conditions

Audio Amplifiers Applications

• Portable MP3 players and digital audio players
• Mobile phones and handheld communication devices
• Personal media players and portable gaming consoles

Audio Amplifiers Procurement Notes

Verify the manufacturer origin as National Semiconductor or Texas Instruments, noting that TI acquired National's semiconductor business. Confirm the specific suffix 'LD' corresponds to the bulk packaged VSSOP-10 variant rather than tape-and-reel options. Ensure RoHS compliance documentation aligns with current regulatory standards for the production batch.

Audio Amplifiers Selection Notes

Select this component when a stereo headphone amplifier with built-in digital volume control is required. It is suitable for battery-powered systems due to its low operating voltage range. Consider the VSSOP-10 package size for space-constrained PCB layouts. Verify that the 105 mW output power meets the requirements for the connected headphone impedance.

Audio Amplifiers Part Context

This part belongs to the Boomer series of audio amplifiers developed by National Semiconductor. The series focuses on high-efficiency, low-power solutions for portable consumer electronics. The LM4811 specifically addresses the need for integrated volume management in compact audio paths, distinguishing it from basic amplifier-only variants within the same family.

Audio Amplifiers Replacement Considerations

The LM4811MMX/NOPB serves as a functional substitute, offering identical electrical characteristics but in an MSOP-10 tape-and-reel package. Other compatible alternatives include the LM4811LD/NOPB, which maintains the same performance specifications while adhering to lead-free manufacturing processes.