LM4890ITPX/NOPB

Series:	Boomer®
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Type:	Class AB
Output Type:	1-Channel (Mono)
Max Output Power x Channels @ Load:	1W x 1 @ 8 Ohm
Voltage - Supply:	2.2 V ~ 5.5 V
Features:	Depop, Shutdown, Thermal Protection
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	8-µSMD (1.36x1.36)
Package / Case:	8-UFBGA
Base Part Number:	LM4890

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LM4890ITPX/NOPB: Application Field and Working Principle

The LM4890ITPX/NOPB is a monolithic dual-channel audio amplifier designed to provide high-quality output power. It is well-suited for a variety of portable and desktop applications and is ideal for single or multiple amplified audio systems. This article will explore the application field and working principle of the LM4890ITPX/NOPB.

Application Field of LM4890ITPX/NOPB

The LM4890ITPX/NOPB is most typically used in portable and desktop audio systems. It is well-suited for a variety of applications, including high-powered audio applications, audio filters, and audio mixing. Additionally, it is suitable for universal audio design applications related to smartphones, notebooks, tablets, and digital loudspeakers. In addition to its high-performance audio capabilities, the LM4890ITPX/NOPB also offers a variety of features that make it a great fit for many audio systems. These features include a low-noise power supply design and an input impedance of 25K ohms. It also has a gain range of +2.5V/V to +20.5V/V, allowing it to be used in both low- and high-gain applications. Additionally, the LM4890ITPX/NOPB boasts a low-noise MOSFET output stage that provides precise control for minimizing THD+N. It has a power-saving shutdown mode, reducing power consumption when the system is not in use. Lastly, it is also protects against inductive loads, further increasing the reliability and efficiency of audio systems.

Working Principle of LM4890ITPX/NOPB

The LM4890ITPX/NOPB is an audio amplifier consisting of two independent channels. Its working principle is based on feedback and input amplification. The amplifier is based on MOSFET output devices, with each channel providing a two-step gain adjustment via its own gain control signals. As the gain control lines increase or decrease in voltage, the output of the amplifier is adjusted accordingly. In order to ensure maximum performance, the power supply design features low-noise operation. This provides accurate control of the amplifier without introducing any external noise. Additionally, the use of a 25K ohm input impedance ensures low-frequency accuracy and prevents distortion from higher frequencies. The LM4890ITPX/NOPB also employs a power-saving shutdown mode. When this feature is enabled, the amplifier is placed in standby, minimizing power consumption. This mode can be utilized when the system is not in use, reducing the overall power consumption and improve system efficiency.

Conclusion

The LM4890ITPX/NOPB is well-suited for a variety of portable and desktop applications. It is designed to provide high-quality output power and features a low-noise power supply design, a gain range of +2.5V/V to +20.5V/V, a low-noise MOSFET output stage, and a power-saving shutdown mode. Additionally, the amplifier works based on feedback and input amplification, utilizing a 25K ohm input impedance for maximum performance. Overall, the LM4890ITPX/NOPB is an ideal choice for any audio system.

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