LM4891MM

Audio Amplifiers Overview

The LM4891MM is a single-channel Class-AB audio power amplifier manufactured by Texas Instruments, originally developed under the National Semiconductor brand. It delivers 1 Watt of output power into an 8-ohm load with a total harmonic distortion plus noise of 0.1 percent. The device operates on a single supply voltage ranging from 2.2 Volts to 5.5 Volts and draws a typical quiescent current of 5 mA. It is housed in a VSSOP-8 surface-mount package and functions within a temperature range of -40°C to +85°C.

Audio Amplifiers Feature Summary

• Class-AB topology designed for high-fidelity audio reproduction
• Integrated short-circuit protection and thermal shutdown circuitry
• Low quiescent current operation suitable for battery-powered systems

Audio Amplifiers Applications

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

Audio Amplifiers Procurement Notes

Verify the manufacturer designation as Texas Instruments, which acquired National Semiconductor. Confirm the specific suffix (e.g., MM vs MMX) determines the tape-and-reel packaging configuration. Ensure RoHS compliance documentation matches the NOPB variant if lead-free status is required for assembly processes.

Audio Amplifiers Selection Notes

Select this component when a single-channel mono amplifier is required for low-voltage applications. The VSSOP-8 package offers a compact footprint for space-constrained designs. Verify that the 8-ohm load impedance aligns with the speaker requirements to achieve the specified 1-watt output performance without exceeding thermal limits.

Audio Amplifiers Part Context

This part belongs to the LM4890 series of audio amplifiers. It shares similar electrical characteristics and pinouts with the LM4890 but may differ in specific internal configurations or packaging options. The series is widely used in consumer electronics requiring efficient, low-power audio amplification solutions.

Audio Amplifiers Replacement Considerations

LM4890MM/NOPB

Audio Amplifiers FAQ

What is the maximum supply voltage for the LM4891MM?

The maximum operating supply voltage is 5.5 Volts.

Does the LM4891MM include protection features?

Yes, it includes short-circuit protection and thermal shutdown to safeguard the device during fault conditions.