LM4991MA/NOPB

Audio Amplifiers Overview

The LM4991MA/NOPB is a single-channel mono Class-AB audio amplifier manufactured by Texas Instruments. It operates on a single power supply ranging from 2.2 V to 5.5 V, with typical operation at 3 V or 5 V. The device delivers up to 3 W of output power into a 3-ohm load, or 1.3 W into 8 ohms and 2.1 W into 4 ohms. It features a total harmonic distortion plus noise (THD+N) of 0.2% and draws a quiescent current of 4 mA. The component is housed in an SOIC-8 surface-mount package and supports an operating temperature range from -40°C to +85°C.

Audio Amplifiers Feature Summary

• Class-AB topology for high-fidelity analog audio amplification
• Single-ended input accepting standard analog audio signals
• Differential output configuration for improved noise immunity
• Integrated thermal protection mechanisms

Audio Amplifiers Applications

• Driving speakers in portable electronic devices
• Audio output stages in battery-powered consumer electronics
• Mono audio systems requiring low quiescent current

Audio Amplifiers Procurement Notes

Verify the specific suffix MA against the official Texas Instruments datasheet to confirm the SOIC-8 package variant. Ensure the NOPB designation is present to guarantee RoHS compliance and lead-free manufacturing status. Cross-reference the manufacturer part number directly with TI documentation rather than relying solely on distributor descriptions to avoid substitution errors.

Audio Amplifiers Selection Notes

Select this component when a single-channel mono amplifier is required for low-voltage applications. It is suitable for designs needing differential outputs from a single-ended source. Consider the 3-ohm load capability if driving low-impedance speakers. Verify that the 4 mA quiescent current aligns with the system's power budget constraints.

Audio Amplifiers Part Context

This part belongs to the LM4991 series of audio amplifiers from Texas Instruments. The series includes variants such as the LM4991LD/NOPB, which shares similar electrical characteristics but utilizes a WSON-8 package instead of the SOIC-8 form factor found in the LM4991MA/NOPB. Both variants target similar mono audio applications within the same voltage and power ranges.

Audio Amplifiers Replacement Considerations

The LM4991LD/NOPB serves as a functional substitute with identical electrical specifications, differing only in the WSON-8 package compared to the SOIC-8 package of the LM4991MA/NOPB.