LM4899MM/NOPB

Audio Amplifiers Overview

The LM4899MM/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 single supply voltage ranging from 2.4V to 5.5V. Key electrical specifications include a quiescent current of 6mA (max) at 5V, standby current of 1µA (max), and a fixed internal gain of 6dB. It features improved PSRR of 83dB at 217Hz and includes advanced pop & click circuitry.

Audio Amplifiers Feature Summary

• Fully differential amplification architecture providing bridged-mode output without requiring external coupling capacitors.
• Internal fixed gain setting of 6dB utilizing precisely matched 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 states.
• Advanced pop and click suppression circuitry that 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 Texas Instruments distributors or certified partners. Confirm the specific package marking corresponds to the MSOP-8 form factor. Ensure design compliance with thermal dissipation requirements for the intended ambient operating temperature range. Review the latest datasheet revision for any updates regarding absolute maximum ratings or application notes.

Audio Amplifiers Selection Notes

Select this component when a fully differential output is required to double the voltage swing and maximize output power efficiency. It is suitable for designs needing fixed 6dB gain without external resistor tolerances. Consider the MSOP-8 package for space-constrained PCB layouts. Evaluate the shutdown selectivity feature if system control logic requires specific high or low active states for power management.

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 audio output with minimal external component counts. The LM4899 specifically targets low-voltage applications where power efficiency and sound quality are critical constraints.

Audio Amplifiers Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.