LM4894IBP

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

LM4894IBP is an audio amplifier integrated circuit made by National Semiconductor. It is ideal for driving high-efficiency, low-impedance speakers powered by either DC or AC sources. The device offers an instantaneous current capability of 2 A at 3.2 V, enabling it to support peak currents of up to 8 A. LM4894IBP is designed to provide an increase in acoustic output level while preserving low distortion and high efficiency. It is ideally suited to applications such as computer notebook speakers, audio/visual equipment, and car audio systems, where board space is limited. Additionally, the device can be used in portable digital music players and cell phones, where low power consumption and reduced system cost are crucial requirements. The chip features an integrated DC-DC step-up converter, a differential PGA with a gain of two, and four rail-to-rail outputs. The circuitry responsible for the four outputs includes output protection with current-limiting and thermal protection circuits. On the audio side, the LM4894IBP contains the necessary components to build a fully functional single-ended Class AB output stage. These components include two non-inverting op-amps, three voltage followers, and two output buffers. The LM4894IBP application circuit consists of the power supply (which can be an issue in cases where the device is to be used in a portable application), the PGA, the Class AB output stage, and the integrated input buffer. The power supply is relatively standard, while the PGA and output stage are the parts essential to the LM4894IBP\'s operation. The PGA is operated by two independent control pins, allowing for adjustable gain control and bass boost features. The LM4894IBP\'s Class AB output stage works by switching between two adjustable supply voltages to drive the load. During up swing, one of the supply voltages is used and the other is held in reserve. During down swing, the opposite occurs, with the previously unused voltage used to drive the load. This method reduces the amplifier\'s distortion and increases its efficiency. When used in installations in which power is available from both DC and AC sources, the LM4894IBP operates in two modes: in AC mode, the two supply voltages are supplied by an AC power supply; in DC mode, one of the two supply voltages is supplied by the DC power supply, and the other by the AC supply. This feature allows for increased power efficiency and reduced distortion levels compared to traditional Class AB amplifiers. In conclusion, the LM4894IBP is an efficient, low-distortion audio amplifier integrated circuit designed to provide maximum power output while minimizing power consumption and complexity. Its integrated DC-DC step-up converter, differential PGA, and four rail-to-rail outputs make it ideal for applications such as notebook speakers, audio/visual equipment, car audio systems, digital music players, and cell phones. With its adjustable gain control and bass boost features, the LM4894IBP is a versatile and cost-effective solution for any application that requires audio amplification.

The specific data is subject to PDF, and the above content is for reference