Series:	Boomer®
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Class D
Output Type:	1-Channel (Mono)
Max Output Power x Channels @ Load:	10W x 1 @ 8 Ohm
Voltage - Supply:	9 V ~ 14 V
Features:	Depop, Short-Circuit and Thermal Protection, Shutdown
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	14-VSON (5x6)
Package / Case:	14-VDFN Exposed Pad
Base Part Number:	LM4668

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LM4668LD/NOPB Application Field and Working Principle

Introduction

The LM4668LD/NOPB is an audio amplifier integrated circuit (IC) manufactured by Texas Instruments. It belongs to the Linear – Amplifiers – Audio family and can be used in various applications where a high accuracy, low noise and low distortion audio amplification is required.

Application Field

The LM4668LD/NOPB works with a wide range of voltages, from 4.5V to 18V. It is typically used to drive small speakers, amplifying audio signals up to 1W. It is suitable for portable devices, such as headphones, portable radios, digital music players or wired headsets, and is extremely popular in the portable audio market.

Working Principle

The LM4668LD/NOPB works with a single-ended class AB amplifier, in which two transistors are used as gain elements. The first stage acts like a differential amplifier, where the signal is amplified and fed to the second stage. This stage works as an emitter follower, where the signal is further amplified before it is outputed.The LM4668LD/NOPB offers an exceptionally low distortion and excellent signal-to-noise ratio. The gain is adjustable via an external resistor and its sleep mode can be controlled through an enable pin. The whole system is protected against shorts, overloads and overvoltage conditions.

Conclusion

The LM4668LD/NOPB is an excellent audio amplifier IC for portable audio applications. It offers high accuracy and low noise, as well as a sleep mode and protection against shorts and overvoltage conditions. It is simple to use and can be adjusted easily by connecting an external resistor.

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