LM4899ITLX/NOPB

Audio Amplifiers Overview

The LM4899ITLX/NOPB is a fully differential audio power amplifier designed for mobile phones and portable communication devices. It delivers 1W continuous average power to an 8Ω load with less than 1% THD+N from a 5VDC supply, or 400mW at 3.3V. The device operates on a 2.4V to 5.5V single supply, features a fixed internal gain of 6dB, and includes a low-power shutdown mode drawing only 0.1µA typical current. It eliminates the need for output coupling capacitors and incorporates advanced pop & click circuitry.

Audio Amplifiers Feature Summary

• Fully differential amplification architecture providing bridged-tied-load (BTL) operation without external coupling capacitors.
• Fixed internal gain of 6dB utilizing precisely matched internal resistors, eliminating the need for external gain-setting components.
• Ultra-low current shutdown mode with selectable high or low logic activation to minimize power consumption in standby.
• Advanced pop & click circuitry virtually eliminates audible noises during turn-on and turn-off transitions.

Audio Amplifiers Applications

• Mobile phones
• Personal Digital Assistants (PDAs)
• Portable electronic devices

Audio Amplifiers Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for obsolete product notices, as National Semiconductor products may have been discontinued or superseded by Texas Instruments equivalents. Ensure ordering suffixes match specific package requirements.

Audio Amplifiers Selection Notes

Select this component for applications requiring minimal external components and high efficiency in low-voltage environments. Consider the fixed 6dB gain constraint when designing input stages. Evaluate thermal management requirements if driving low-impedance loads like 4Ω speakers, as power dissipation increases significantly compared to single-ended configurations.

Audio Amplifiers Part Context

The LM4899 belongs to the Boomer family of audio power amplifiers developed by National Semiconductor, now part of Texas Instruments. This series focuses on delivering high-quality output power with minimal external component counts, specifically targeting the constraints of battery-powered portable electronics where space and power efficiency are critical design parameters.

Audio Amplifiers Replacement Considerations

Direct replacement options include LM4899ITL/NOPB and LM4899MM/NOPB. Verify pinout compatibility and package dimensions before substitution. Check datasheet revisions for any parameter changes between original National Semiconductor and current Texas Instruments manufacturing batches.