LM4809LD/NOPB

Audio Amplifiers Overview

The LM4809LD/NOPB is a stereo Class-AB audio amplifier manufactured by Texas Instruments, designed for low-voltage portable applications. It delivers 105 mW of continuous output power per channel into a 16-ohm load with a total harmonic distortion plus noise (THD+N) of 0.3%. The device operates on a single supply voltage ranging from 2 V to 5.5 V and draws a typical quiescent current of 1.4 mA. It features integrated pop-and-click suppression and a shutdown mode to minimize audible artifacts and extend battery life. The component is housed in an 8-pin WSON package and supports operation across a temperature range of -40°C to +85°C.

Audio Amplifiers Feature Summary

• Integrated pop-and-click suppression circuitry eliminates audible transients during power-up and power-down sequences.
• Shutdown mode significantly reduces standby current consumption to preserve battery life in portable devices.
• Class-AB topology provides high-fidelity audio reproduction with low distortion characteristics.

Audio Amplifiers Applications

• Mobile phones and smartphones
• Personal digital assistants (PDAs)
• Portable media players

Audio Amplifiers Procurement Notes

Verify the specific suffix LD against the manufacturer's official datasheet to confirm pinout compatibility and package dimensions. Ensure the NOPB designation aligns with current RoHS compliance requirements for your target market. Cross-reference the part number with authorized distributors to confirm availability and authenticity before procurement.

Audio Amplifiers Selection Notes

Select this component when designing systems requiring stereo audio amplification within strict power constraints. It is suitable for applications where low quiescent current and minimal external components are critical. Consider the 16-ohm load impedance specification when matching speaker drivers. Evaluate the thermal performance within the 8-WSON package for the intended enclosure environment.

Audio Amplifiers Part Context

This device belongs to the LM4809 family of audio amplifiers from Texas Instruments. The family includes variants such as LM4809MM and LM4809LDX, which share similar electrical characteristics but differ in packaging or tape-and-reel specifications. The LM4809 series is engineered for mobile consumer electronics, offering a balance between audio quality and power efficiency.

Audio Amplifiers Replacement Considerations

LM4809MM/NOPB and LM4809LDX/NOPB are documented alternatives within the same product family. Verify package compatibility and pin assignments before substitution. Other manufacturers offer similar Class-AB headphone amplifiers, but direct replacement requires careful evaluation of electrical parameters and physical footprint.