LM4891MX/NOPB

Audio Amplifiers Overview

The LM4891MX/NOPB is a Class-AB audio power amplifier from the Boomer series, designed for mobile phones and portable devices. It delivers 1W to an 8Ω BTL load at 5V with <1% THD+N. Operating voltage ranges from 2.2V to 5.5V. Key specifications include a quiescent current of 4mA (max) at 5V and shutdown current of 0.1µA (max). PSRR is 62dB at 217Hz. The device features thermal shutdown protection and requires no output coupling capacitors.

Audio Amplifiers Feature Summary

• Ultra-low current shutdown mode activated by logic high signal
• Advanced pop and click circuitry eliminates turn-on/off noise
• Bridge-tied-load (BTL) configuration drives capacitive loads without output coupling capacitors
• Internal thermal shutdown protection mechanism

Audio Amplifiers Applications

• Mobile phones
• PDAs
• Portable electronic devices

Audio Amplifiers Procurement Notes

Verify component authenticity through authorized Texas Instruments channels or certified distributors. Confirm the obsolete status and availability constraints before finalizing procurement plans. Ensure strict adherence to ESD handling protocols during storage and assembly to prevent damage to internal MOS gates.

Audio Amplifiers Selection Notes

Select this component for low-voltage applications requiring minimal external components. Verify that the system gain remains within unity-gain stability limits to minimize distortion. Evaluate PCB copper area requirements to manage thermal dissipation effectively under maximum power conditions.

Audio Amplifiers Part Context

This part belongs to the LM4891 Boomer Audio Power Amplifier Series. It is manufactured by Texas Instruments. The device is classified as obsolete. It utilizes a micro SMD package variant for space-saving integration in compact portable electronics.

Audio Amplifiers Replacement Considerations

LM4891MX/NOPB is marked obsolete. No specific substitute part numbers are documented in the provided source material.