LM4991LDX/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: Audio Amplifier
• Characteristics: Low Noise, High Performance
• Package: DFN (Dual Flat No-Lead)
• Essence: Class AB Audio Power Amplifier
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Power Supply Voltage: 2.7V to 5.5V
• Output Power: 1.4W into 8Ω at 5V
• Total Harmonic Distortion + Noise: 0.1% (typical) at 1kHz, 1.2W into 8Ω
• Quiescent Current: 3.6mA (typical)
• Shutdown Current: 0.01μA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4991LDX/NOPB IC has the following pin configuration:

```

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| | --| VDD GND |-- Power Supply Pins --| INP INN |-- Differential Input Pins --| SHDN OUT |-- Shutdown and Output Pins |___________| ```

Functional Features

• Low noise and distortion for high-quality audio reproduction.
• Wide operating voltage range allows flexibility in power supply selection.
• Shutdown mode for power-saving applications.
• Short-circuit and thermal protection for enhanced reliability.
• Small package size enables space-efficient designs.

Advantages and Disadvantages

Advantages: - High-performance audio amplification. - Low power consumption. - Protection features enhance durability. - Compact package size.

Disadvantages: - Limited output power compared to higher wattage amplifiers. - Requires external components for a complete audio system.

Working Principles

The LM4991LDX/NOPB is a class AB audio power amplifier. It amplifies the input audio signal and provides an amplified output to drive speakers or headphones. The IC operates by converting the low voltage input signal into a higher voltage output signal with minimal distortion and noise. It utilizes a combination of internal circuitry and external components to achieve high-quality audio amplification.

Detailed Application Field Plans

The LM4991LDX/NOPB is suitable for various audio applications, including:

1. Portable Audio Devices: MP3 players, smartphones, tablets, etc.
2. Personal Computers: Sound cards, multimedia systems, etc.
3. Home Entertainment Systems: Amplifiers, receivers, etc.
4. Automotive Audio Systems: Car stereos, amplifiers, etc.
5. Industrial Audio Equipment: Public address systems, intercoms, etc.

Detailed and Complete Alternative Models

1. LM4861: 1.1W Audio Power Amplifier
2. LM386: Low Voltage Audio Power Amplifier
3. TPA3116D2: 50W Stereo Class D Audio Amplifier
4. MAX9744: 20W Stereo Class D Audio Power Amplifier
5. TDA7297: Dual Bridge Audio Amplifier

These alternative models offer different power outputs, features, and package options, providing flexibility for various audio amplification requirements.

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