LM4811LD/NOPB

Series:	Boomer®
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Class AB
Output Type:	Headphones, 2-Channel (Stereo)
Max Output Power x Channels @ Load:	105mW x 2 @ 16 Ohm
Voltage - Supply:	2 V ~ 5.5 V
Features:	Depop, Shutdown, Thermal Protection, Volume Control
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	10-WSON (3x3)
Package / Case:	10-WFDFN Exposed Pad
Base Part Number:	LM4811

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Introduction

The LM4811LD/NOPB is a low-power, low-noise audio amplifier designed for portable audio devices. It is an excellent choice for headphone and line-level outputs. It is designed to operate from a single 3V to 6V supply, but can be operated from a 7V to 18V battery supply. The device can provide a maximum output power of 500mW into 8 ohm loads or 300 mW into 16 ohm loads. It features a low noise floor and low distortion over a wide frequency response range.

Application Field of LM4811LD/NOPB

The LM4811LD/NOPB is a versatile amplifier and can be used in a variety of applications. It is an ideal choice for headphone amplifiers, portable audio systems, CD players, MP3 players, portable DVD players, digital still cameras and other audio devices. It can be used in desktop and laptop computers for line-level outputs. It is also suitable for use in medical instrumentation and hearing aid applications.

Working Principle of LM4811LD/NOPB

The LM4811LD/NOPB is a class AB amplifier, which means it combines the power efficiency of class B amplifiers with the low distortion of class A amplifiers. It works by taking an input signal and converting it to a larger signal with a gain that is adjustable by the user. The amplifier is built using the standard non-inverting gain configuration.The LM4811LD/NOPB features an integrated output power stage and a separate control section. The output section consists of an internal power amplifier stage, output protection diode, and output voltage regulator. The control section provides a variable gain compensation circuit and a low-power, low-noise differential input stage.The LM4811LD/NOPB uses a current-feedback topology to provide excellent linearity, low noise and distortion, and wide bandwidth. The amplifier features a low input impedance, making it suitable for use with headphones. It also features an output short circuit protection feature, which prevents the device from outputting excessive power in the case of a short circuit.

Conclusion

The LM4811LD/NOPB is a low-power, low-noise audio amplifier designed for portable audio applications. It is an excellent choice for headphone and line-level outputs. It can provide a maximum output power of 500mW into 8 ohm loads or 300 mW into 16 ohm loads. The amplifier works by taking an input signal and converting it to a larger signal with a gain that is adjustable by the user. It features a low noise floor and low distortion over a wide frequency response range. It is a versatile amplifier and can be used in a variety of applications such as headphone amplifiers, portable audio systems, CD players, and MP3 players. The LM4811LD/NOPB is an ideal choice for portable audio devices.

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