LM4851ITLX/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: Audio Amplifier
• Characteristics: Low voltage, mono Class AB amplifier
• Package: Thin SOT-23 package
• Essence: Provides high-quality audio amplification in portable devices
• Packaging/Quantity: Tape and Reel packaging, 3000 units per reel

Specifications

• Operating Voltage: 2.5V to 5.5V
• Output Power: Up to 1W
• Total Harmonic Distortion + Noise: 0.1% (typical)
• Shutdown Current: 0.01μA (typical)
• Input Impedance: 32kΩ (typical)
• Shutdown Pop Suppression: Yes
• Thermal Shutdown Protection: Yes

Pin Configuration

The LM4851ITLX/NOPB IC has the following pin configuration:

1. VDD: Power supply input
2. GND: Ground reference
3. SD: Shutdown control input
4. IN+: Positive audio input
5. IN-: Negative audio input
6. OUT: Amplified audio output

Functional Features

• Low voltage operation allows for use in battery-powered devices
• Class AB amplifier provides high-quality audio reproduction
• Shutdown control for power-saving mode
• Pop suppression during shutdown to prevent audible noise
• Thermal shutdown protection prevents damage due to excessive heat

Advantages

• Compact and thin package suitable for space-constrained applications
• Low operating voltage extends battery life in portable devices
• High-quality audio amplification for improved sound experience
• Shutdown feature reduces power consumption when not in use
• Pop suppression eliminates noise during power on/off transitions

Disadvantages

• Limited output power compared to higher wattage amplifiers
• Mono configuration may not be suitable for stereo applications

Working Principles

The LM4851ITLX/NOPB is a mono Class AB audio amplifier designed for low voltage operation. It amplifies the audio signal received at the input pins (IN+ and IN-) and provides an amplified output signal at the OUT pin. The amplifier operates in Class AB mode, which ensures high-quality audio reproduction with low distortion.

The IC includes a shutdown control input (SD) that allows the user to put the amplifier into a power-saving mode when not in use. During shutdown, pop suppression circuitry ensures that no audible noise is produced. Additionally, the IC incorporates thermal shutdown protection to prevent damage from excessive heat.

Application Field Plans

The LM4851ITLX/NOPB is commonly used in various portable audio devices, such as:

1. Mobile phones
2. MP3 players
3. Portable gaming consoles
4. Bluetooth speakers
5. Personal digital assistants (PDAs)

Its compact size, low voltage operation, and high-quality audio amplification make it ideal for these applications.

Alternative Models

If the LM4851ITLX/NOPB does not meet specific requirements, alternative models with similar functionality include:

1. LM4861: Stereo Class AB audio amplifier
2. LM4881: Higher wattage mono Class AB audio amplifier
3. TPA3116D2: Digital audio amplifier with integrated DSP

These alternatives offer different features and specifications, allowing users to choose the most suitable option for their application.

In conclusion, the LM4851ITLX/NOPB is a low voltage mono Class AB audio amplifier that provides high-quality audio amplification in portable devices. Its compact size, low power consumption, and thermal protection make it a popular choice for various applications. However, its limited output power and mono configuration may not be suitable for all scenarios. Users can consider alternative models to meet specific requirements.