LM4891LD

Audio Amplifiers Overview

The LM4891LD is an obsolete Texas Instruments Boomer® audio power amplifier designed for mobile phones and portable communication devices. It delivers 1W continuous average power to an 8Ω BTL load with less than 1% THD+N from a 5VDC supply, or 400mW at 3.3V. Operating on a single supply voltage ranging from 2.2V to 5.5V, it features ultra-low current shutdown mode (0.1µA typical), thermal shutdown protection, and advanced pop & click circuitry. The device requires no output coupling capacitors, bootstrap networks, or snubber circuits.

Audio Amplifiers Feature Summary

• Ultra-low current shutdown mode activated by logic high signal
• Advanced pop and click circuitry eliminates turn-on/off transition noises
• BTL output configuration capable of driving capacitive loads
• Unity-gain stable design with external gain configuration capability

Audio Amplifiers Applications

• Mobile Phones
• PDAs
• Portable Electronic Devices

Audio Amplifiers Procurement Notes

Verify component obsolescence status before procurement planning. Confirm availability through authorized distributors or secondary market channels as production has ceased. Validate datasheet revision SNAS122E–REVISED APRIL 2013 for accurate electrical specifications. Ensure compatibility with existing PCB layouts utilizing the NGZ package footprint.

Audio Amplifiers Selection Notes

Select this component only if legacy system compatibility with the LM4891 family is required. Evaluate thermal dissipation requirements carefully, as maximum internal power dissipation increases significantly in bridge configurations compared to single-ended designs. Verify that the exposed-DAP package mounting considerations align with available PCB copper heatsink areas.

Audio Amplifiers Part Context

The LM4891 belongs to Texas Instruments' Boomer® Audio Power Amplifier Series. This series focuses on providing high-quality output power with minimal external components, specifically targeting low-voltage applications where minimal power consumption is critical. The LM4891LD variant utilizes the WSON package format.

Audio Amplifiers Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.