LM4915LQX/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Audio Amplifier

Characteristics: - Low voltage audio power amplifier - Stereo configuration - High output power capability - Wide supply voltage range - Thermal shutdown protection - Short-circuit protection - Pop and click suppression circuitry

Package: QFN (Quad Flat No-Lead) package

Essence: The LM4915LQX/NOPB is a low voltage stereo audio power amplifier IC designed for portable devices such as smartphones, tablets, and portable media players. It provides high-quality audio amplification with various protection features.

Packaging/Quantity: The LM4915LQX/NOPB is available in a QFN package and is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Output Power: Up to 1.3W per channel into 8Ω load at 5V supply
• Total Harmonic Distortion + Noise (THD+N): 0.1% (typical)
• Shutdown Current: 0.01µA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4915LQX/NOPB has a total of 20 pins. The pin configuration is as follows:

Pin 1: VDD Pin 2: SHUTDOWN Pin 3: BYPASS Pin 4: GAIN1 Pin 5: GAIN0 Pin 6: INL- Pin 7: INL+ Pin 8: AGND Pin 9: OUTL Pin 10: PVDD Pin 11: PVDD Pin 12: OUTR Pin 13: INR+ Pin 14: INR- Pin 15: VREF Pin 16: BYPASS Pin 17: GAIN2 Pin 18: GAIN3 Pin 19: SHUTDOWN Pin 20: VDD

Functional Features

1. Low Voltage Operation: The LM4915LQX/NOPB operates at a low supply voltage range of 2.7V to 5.5V, making it suitable for portable devices with limited power resources.

2. Stereo Configuration: It provides stereo audio amplification, allowing for a more immersive audio experience.

3. High Output Power Capability: With an output power of up to 1.3W per channel into an 8Ω load at a 5V supply, the LM4915LQX/NOPB delivers sufficient power for small speakers or headphones.

4. Wide Supply Voltage Range: The IC can operate within a wide supply voltage range, providing flexibility in various applications.

5. Protection Features: The LM4915LQX/NOPB incorporates thermal shutdown protection and short-circuit protection, ensuring safe operation and preventing damage to the device.

6. Pop and Click Suppression Circuitry: This feature minimizes audible noise during power-on and power-off transitions, enhancing the overall audio experience.

Advantages and Disadvantages

Advantages: - Low voltage operation allows for compatibility with portable devices. - High output power capability enables driving small speakers or headphones. - Protection features ensure safe operation and prevent damage. - Pop and click suppression circuitry enhances audio quality.

Disadvantages: - Limited output power may not be suitable for high-power audio applications. - QFN package may require specialized equipment for soldering and rework.

Working Principles

The LM4915LQX/NOPB is a class AB audio amplifier that amplifies the input audio signal to a level suitable for driving speakers or headphones. It operates by receiving an analog audio input signal, which is then amplified and delivered to the output channels. The gain of the amplifier can be adjusted using the gain control pins (GAIN0, GAIN1, GAIN2, GAIN3). The IC also incorporates various protection features to ensure safe operation and prevent damage.

Detailed Application Field Plans

The LM4915LQX/NOPB is commonly used in portable electronic devices where audio amplification is required. Some potential application fields include:

1. Smartphones: The IC can be used to amplify audio signals for the built-in speakers or headphone outputs in smartphones, providing improved sound quality.

2. Tablets: Tablets often require audio amplification for multimedia applications. The LM4915LQX/NOPB can be utilized to enhance the audio output capabilities of tablets.

3. Portable Media Players: Portable media players, such