LM4858MM/NOPB

Series:	Boomer®
Packaging:	Tape & Reel (TR)
Part Status:	Discontinued at Digi-Key
Type:	Class AB
Output Type:	1-Channel (Mono) with Stereo Headphones
Max Output Power x Channels @ Load:	1.9W x 1 @ 3 Ohm; 300mW x 2 @ 8 Ohm
Voltage - Supply:	2.4 V ~ 5.5 V
Features:	Depop, Shutdown, Thermal Protection
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	10-VSSOP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Base Part Number:	LM4858

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Introduction

The LM4858MM/NOPB is a rail-to-rail CMOS audio amplifier specifically designed for portable applications such as cell phones, PDAs, and mp3 players. It features low quiescent current, a wide power supply voltage range, and low noise for high quality audio reproduction. This article will discuss the application field and working principle of the LM4858MM/NOPB in greater detail.

Application Field

The LM4858MM/NOPB is ideal for portable audio applications because it offers low quiescent current, wide power supply voltage ranges, and low noise. It is designed to operate from a single supply voltage ranging from 2.7V to 5.5V, making it well suited for use in battery operated systems. Additionally, it draws only 5 mA of quiescent current, which significantly reduces overall power consumption. This makes it especially suitable for use in energy sensitive applications. Finally, it has low noise of only 63 μVRMS, ensuring high-quality audio reproduction.

Features and Benefits

The LM4858MM/NOPB features a rail-to-rail output stage, allowing it to drive large capacitive loads with minimal distortion. Additionally, it has a wide signal-to-noise ratio of 107 dB and an output voltage swing of up to 100 mV. This makes it suitable for use in applications ranging from amplifying voice signals to driving high-impedance headphones. Other features include an on-chip class G gain control and an integrated thermal shutdown circuit.

Working Principle

The LM4858MM/NOPB is an integrated class AB audio amplifier that consists of two stages: an input stage and an output stage. The input stage consists of two differential stages. The first stage provides voltage amplification, while the second stage provides current amplification. The gain of the input stage is set by two external feedback resistors, allowing it to be easily tuned for specific applications. The output stage consists of two common-source BJT transistors. One of the transistors is used to drive the output voltage upwards, while the other drives the voltage downwards. The output stage is biased for class AB operation, allowing for maximum efficiency.

Conclusion

The LM4858MM/NOPB is a rail-to-rail CMOS audio amplifier designed for portable audio applications. It features low quiescent current, wide power supply voltage ranges, and low noise, making it an ideal choice for energy sensitive applications. The LM4858MM/NOPB also has a rail-to-rail output stage, wide signal-to-noise ratio, and integrated class G gain control and thermal shutdown circuits. Finally, it consists of two stages, an input stage and an output stage. The input stage consists of two differential stages, while the output stage contains two common-source BJT transistors.

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