LM4990LD/NOPB

Product Overview

• Category: Integrated Circuit (IC)
• Use: Audio Amplifier
• Characteristics: Low Noise, High Performance
• Package: 8-Lead LLP
• 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: 1.1W into 8Ω at 5V
• Total Harmonic Distortion + Noise: 0.1% (typical) at 1kHz, 1W
• Quiescent Current: 4mA (typical)
• Shutdown Current: 0.01μA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4990LD/NOPB 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 audio amplifier suitable for portable devices
• Class AB operation for efficient power consumption
• Shutdown mode for power saving
• Short-circuit and thermal protection
• Internal gain setting resistors for simplified design

Advantages

• High-quality audio reproduction with low distortion
• Wide operating voltage range allows flexibility in power supply selection
• Small package size enables compact device designs
• Efficient power consumption extends battery life in portable applications

Disadvantages

• Limited output power may not be suitable for high-power audio applications
• Requires external components for proper operation
• Sensitive to improper grounding and layout design

Working Principles

The LM4990LD/NOPB is a class AB audio power amplifier designed for low noise and high-performance audio applications. It operates by amplifying the differential input signal received at the INP and INN pins. The amplified output signal is then available at the OUT pin.

The amplifier can be enabled or disabled using the SHDN pin, allowing for power-saving operation when not in use. Internal gain setting resistors simplify the design process by eliminating the need for external components.

The LM4990LD/NOPB also incorporates short-circuit and thermal protection mechanisms to ensure safe operation and prevent damage to the device.

Application Field Plans

The LM4990LD/NOPB is commonly used in various portable audio devices such as smartphones, tablets, portable media players, and Bluetooth speakers. Its low noise characteristics make it suitable for applications where high-quality audio reproduction is desired.

Alternative Models

• LM4863LD/NOPB: 2.2W Class AB Audio Power Amplifier
• LM4881LD/NOPB: 1.1W Class AB Audio Power Amplifier with Shutdown Mode
• LM4950LD/NOPB: 1.1W Class D Audio Power Amplifier

These alternative models offer similar functionality and performance, providing options for different design requirements.

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