LM4921ITL/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Audio Amplifier

Characteristics: - Single supply voltage: 2.7V to 5.5V - Output power: 1.2W (typical) - Low quiescent current: 4mA (typical) - Shutdown mode for power saving - Thermal shutdown protection - Small package size: 10-pin ThinSOT

Package: ThinSOT-23-10

Essence: The LM4921ITL/NOPB is an audio amplifier IC designed for portable devices such as smartphones, tablets, and portable media players. It provides high-quality audio amplification with low power consumption.

Packaging/Quantity: The LM4921ITL/NOPB is available in a ThinSOT-23-10 package. It is typically sold in reels of 3000 units.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Quiescent Current: 4mA (typical)
• Output Power: 1.2W (typical)
• Shutdown Current: 0.01μA (typical)
• Total Harmonic Distortion + Noise (THD+N): 0.1% (typical)
• Signal-to-Noise Ratio (SNR): 95dB (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4921ITL/NOPB has the following pin configuration:

___________ | | NC |1 10| VDD IN- |2 9| SHUTDOWN IN+ |3 8| GND BYP |4 7| OUT NC |5 6| NC |___________|

Functional Features

1. Single Supply Operation: The LM4921ITL/NOPB operates with a single supply voltage, making it suitable for portable devices with limited power resources.

2. Low Quiescent Current: With a low quiescent current of only 4mA, the LM4921ITL/NOPB helps conserve battery life in portable devices.

3. Shutdown Mode: The IC features a shutdown mode that allows for power-saving when the amplifier is not in use.

4. Thermal Shutdown Protection: The LM4921ITL/NOPB incorporates thermal shutdown protection to prevent damage due to excessive heat.

Advantages and Disadvantages

Advantages: - High-quality audio amplification - Low power consumption - Small package size - Shutdown mode for power saving - Thermal shutdown protection

Disadvantages: - Limited output power compared to higher wattage amplifiers - Not suitable for high-power audio applications

Working Principles

The LM4921ITL/NOPB is a class AB audio amplifier that amplifies the input audio signal while maintaining low distortion and noise levels. It operates by modulating the input signal using a push-pull configuration, which allows for efficient amplification.

When an audio signal is applied to the IN+ and IN- pins, the LM4921ITL/NOPB amplifies the signal and outputs it through the OUT pin. The BYP pin is used to bypass the internal gain setting resistor, allowing for external gain control if desired.

Detailed Application Field Plans

The LM4921ITL/NOPB is commonly used in various portable electronic devices where audio amplification is required. Some application fields include:

1. Smartphones: The LM4921ITL/NOPB can be used to enhance the audio output of smartphones, providing better sound quality for multimedia playback and phone calls.

2. Tablets: Tablets can benefit from the LM4921ITL/NOPB by improving the audio performance for gaming, video streaming, and music playback.

3. Portable Media Players: The IC can be integrated into portable media players to deliver high-quality audio output for an enhanced listening experience.

Detailed and Complete Alternative Models

1. LM4861: This is a similar audio amplifier IC with a higher output power of 1.5W and a slightly larger package size.

2. LM4950: Another alternative, offering stereo audio amplification with a maximum output power of 2.2W per channel.

3. TDA7266: A dual bridge audio amplifier IC with a higher output power of 7W per channel, suitable for more demanding audio applications.

These alternative models provide different specifications and features, allowing designers to choose the most suitable option based on their specific requirements.

In conclusion, the LM4921ITL/NOPB is a compact and efficient audio amplifier IC designed for portable devices. Its