LM4903MM/NOPB

Audio Amplifiers Overview

The LM4903MM/NOPB is a mono audio power amplifier in the Boomer family, housed in an 8-pin VSSOP package. It operates on a single supply voltage ranging from 2.0V to 5.5V and delivers up to 1.07W of continuous average power into an 8Ω load at 5V with less than 1% THD+N. The device features a bridge-tied load (BTL) output configuration that eliminates the need for external coupling capacitors or bootstrap networks. Key electrical parameters include a quiescent current of 4mA at 5V and a shutdown current as low as 0.1µA.

Audio Amplifiers Feature Summary

• Ultra-low current shutdown mode minimizes power consumption when disabled
• Advanced pop and click circuitry prevents audible noise during power transitions
• Bridge-tied load architecture drives capacitive loads without output coupling capacitors
• Unity-gain stable design allows flexible external gain configuration

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 the part number matches the obsolete status indicated in public documentation. Ensure the VSSOP-8 package variant aligns with your PCB footprint requirements. Validate RoHS compliance status against current regulatory standards before finalizing procurement.

Audio Amplifiers Selection Notes

Select this component for applications requiring high efficiency in a minimal footprint. The BTL topology doubles output swing compared to single-ended designs, making it suitable for low-voltage systems. Consider the thermal resistance characteristics and required copper area for heat dissipation if operating near maximum power limits. Verify input signal levels match the unity-gain stability requirements.

Audio Amplifiers Part Context

This device belongs to Texas Instruments' Boomer audio amplifier series, engineered specifically for portable communication equipment. It integrates two internal operational amplifiers configured for bridged operation. The LM4903 represents a legacy solution for mobile audio, prioritizing low external component count and high power density within compact surface-mount packages.

Audio Amplifiers Replacement Considerations

Public datasheets identify the LM4903 as obsolete. No specific substitute part numbers are documented in the provided source material.