LM4808MX/NOPB: Comprehensive Analysis of Audio Power Amplifiers

DESCRIPTIONThe LM4808 is a dual audio power amplifier capable of delivering 105mW per channel of continuous average power into a 162 load with 0.1% (THD+N) from a 5V power supply.

Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components using surface mount packaging.

Since the LM4808 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems.

The unity-gain stable LM4808 can be configured by external gain-setting resistors.

LM4808MX/NOPB Features

PINOUT

Top ViewWSON PackageSee Package Number NGL0008B

Top ViewSOIC & VSSOP PackageSee Package Number D0008A, DGK0008A

ABSOLUTE MAXIMUM RATINGS 

Key Specifications

-Output Power at 0.1% THD+N at 1kHz Into 32Ω70 mW (typ)

LM4808MX/NOPB Applications

1. Headphone Amplifier

Advantages of LM4808:

-High Output Power: Delivers up to 105 mW per channel into a 16Ω load.

-Low Distortion, High Fidelity: Only 0.1% THD+N, ensuring clean audio playback.

-Click-and-Pop Suppression: Prevents power-up/down noise for a better user experience.

-Minimal External Components: No need for bootstrap or compensation circuitry; saves board space.

Example Use Cases:

-High-quality MP3 players

-DIY headphone amplifier kits

-Portable music player modules or upgrade projects

2. Personal Computers

Advantages of LM4808:

-Wide Operating Voltage (2V to 5.5V): Compatible with USB power or 3.3V/5V system power.

-Low Power, Low Heat: 3 mA quiescent current makes heat management simple.

-Dual-Channel Output: Directly drives left and right headphone or speaker channels.

-Ideal for Integrated or USB Audio Modules: Easily works with onboard audio solutions.

Example Use Cases:

-USB headphone/sound card expansion modules

-Audio enhancement in all-in-one PCs or mini desktops

-Premium keyboards/mice with audio pass-through features

3. Portable Electronic Devices

Advantages of LM4808:

-Compact SOIC-8 Package: Ideal for tight layout designs.

-Low Voltage Operation (from 2V): Compatible with AA batteries or lithium cells.

-Minimal External Components: Only a few capacitors are needed for decoupling and AC coupling.

-High EMI Immunity: Performs reliably in complex electromagnetic environments.

Example Use Cases:

-Children's educational audio devices

-Handheld learning machines or language translators

-Bluetooth modules with headphone output

-Handheld medical devices with voice alerts

Typical Application

Conclusion

The LM4808MX/NOPB is a high-performance, low-power dual-channel audio power amplifier. With 0.1% low distortion, up to 105 mW output per channel, and minimal external component requirements, it is an ideal choice for headphone amplifiers, PC audio modules, and various portable electronic devices. Its SOIC-8 surface-mount package allows for easy integration in compact designs, while built-in click-and-pop suppression and excellent power supply ripple rejection ensure clean and stable audio output. Whether for DIY projects or mass production, the LM4808 delivers outstanding cost-effectiveness and reliability-making it a trusted solution for audio system designers.