LM4949TLX/NOPB

Audio Amplifiers Overview

The LM4949TLX/NOPB is a stereo Class D audio subsystem manufactured by National Semiconductor, now part of Texas Instruments. It integrates an OCL headphone amplifier with digital control capabilities. The device delivers 2.5W per channel into a 4-ohm load and 190mW per channel into a 16-ohm load. It operates within a specified supply voltage range and features a THD plus noise of 0.05%. The component utilizes a DSBGA-25 package and supports operation at minimum temperatures of -40°C.

Audio Amplifiers Feature Summary

• Integrates I²C interface for digital volume control and system management
• Includes built-in depop, mute, short-circuit, and thermal protection circuits
• Supports differential inputs for improved noise immunity in audio applications

Audio Amplifiers Applications

• Portable audio devices requiring stereo output
• Headphone amplification systems
• Consumer electronics with digital audio interfaces

Audio Amplifiers Procurement Notes

Verify the manufacturer designation as National Semiconductor or Texas Instruments on the component marking. Confirm the suffix NOPB indicates lead-free and RoHS compliance. Ensure the package type matches the required DSBGA-25 footprint for PCB layout compatibility. Check datasheet revisions for any pinout or electrical specification updates before finalizing procurement.

Audio Amplifiers Selection Notes

Select this component when a compact stereo Class D solution with integrated headphone drive is required. The I²C interface allows for software-controlled volume adjustment, reducing external component count. Consider the power output requirements relative to the load impedance to ensure adequate performance. Verify that the operating temperature range meets the environmental conditions of the target application.

Audio Amplifiers Part Context

This part belongs to the LM4949 family of audio subsystems. It combines a Class D amplifier stage with a headphone output stage. The NOPB suffix typically denotes non-phosphorus lead-free packaging compliant with environmental standards. The device is designed for high-efficiency audio reproduction in space-constrained portable devices.

Audio Amplifiers Replacement Considerations

Check for direct replacements within the LM4949 series from Texas Instruments. Verify pin-to-pin compatibility if substituting with similar audio subsystems. Ensure that alternative components support the same I²C control protocol and power delivery specifications.