LM4839LQ/NOPB Integrated Circuits (ICs)

Series:	Boomer®
Packaging:	Tape & Reel (TR)
Part Status:	Discontinued at Digi-Key
Type:	Class AB
Output Type:	2-Channel (Stereo) with Stereo Headphones
Max Output Power x Channels @ Load:	2.2W x 2 @ 3 Ohm; 95mW x 2 @ 32 Ohm
Voltage - Supply:	2.7 V ~ 5.5 V
Features:	Bass Boost, Depop, Input Multiplexer, Mute, Shutdown, Thermal Protection, Volume Control
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	28-WQFN (5x5)
Package / Case:	28-WFQFN Exposed Pad
Base Part Number:	LM4839

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Introduction

The LM4839LQ/NOPB is a stereo audio power amplifier developed by Texas Instruments for use in portable audio applications. It is a two-channel, low power audio amplifier designed specifically for use in personal audio applications such as headphones, portable audio players, computers, and cell phones. The LM4839LQ/NOPB contains a stereo amplifier, low-power standbymode, boost capability, and thermal shutdown in a single package.

Features

The LM4839LQ/NOPB offers a number of features that make it ideal for use in portable audio applications. It features a low-power standby mode, providing a minimum of power consumption, while enabling audio on demand. The boost mode provides additional gain, allowing the user to adjust the audio output level to the desired volume. It also includes integrated thermal shutdown circuitry, which shuts off the amplifier in the event of an over-temperature condition.

Application Fields

The LM4839LQ/NOPB is designed for use in portable audio applications, such as headphones, portable audio players, computers, and cell phones. It is ideal for providing an audio output stage for consumer electronics, such as MP3 players, portable media players, mobile phones, and laptop computers. The LM4839LQ/NOPB\'s low-power standby mode and thermal shutdown capabilities also make it well-suited for applications where battery life and thermal performance is critical.

Working Principle

The LM4839LQ/NOPB operates by integrating a low-power standby mode with a low-power boost capability. The standby mode minimizes power consumption when the audio device is not in use, while the boost mode provides an additional gain that allows the user to adjust the output volume of the audio device. Both of these features are integrated into a single package, which makes the unit highly efficient and cost-effective.In addition, the LM4839LQ/NOPB includes thermal shutdown circuitry which protects the device from damage due to overheating. In the event of an over-temperature condition, the amplifier will shut off, preventing further damage to the device.

Conclusion

The LM4839LQ/NOPB is an effective, cost-effective audio power amplifier designed for use in portable audio applications. Its low-power standby mode allows for minimum power consumption, while its boost capability and thermal shutdown circuitry further increase its efficiency. The LM4839LQ/NOPB is an ideal choice for providing an audio output stage for consumer electronics, and its various features make it well-suited for applications where battery life and thermal performance are of utmost importance.

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