LM4855LQ/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Audio Amplifier

Characteristics: - High-performance audio amplifier - Low power consumption - Small form factor - Wide voltage range operation

Package: QFN (Quad Flat No-leads) package

Essence: The LM4855LQ/NOPB is a high-performance audio amplifier IC designed for various portable audio applications.

Packaging/Quantity: Available in tape and reel packaging, with 2500 units per reel.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Output Power: Up to 1.1W per channel
• Total Harmonic Distortion (THD+N): 0.1% at 1kHz, 0.5W
• Efficiency: Up to 90%
• Shutdown Current: <1µA
• Operating Temperature Range: -40°C to +85°C

Detailed Pin Configuration

The LM4855LQ/NOPB has a total of 20 pins arranged as follows:

Pin 1: VDD Pin 2: GND Pin 3: SD (Shutdown) Pin 4: INL- (Left Channel Negative Input) Pin 5: INL+ (Left Channel Positive Input) Pin 6: BYP (Bypass Capacitor) Pin 7: OUTL (Left Channel Output) Pin 8: PVDD Pin 9: PGND Pin 10: VREF Pin 11: INR- (Right Channel Negative Input) Pin 12: INR+ (Right Channel Positive Input) Pin 13: BIAS Pin 14: OUTR (Right Channel Output) Pin 15: VDD Pin 16: GND Pin 17: AGND Pin 18: AVDD Pin 19: VOUTL (Left Channel Headphone Output) Pin 20: VOUTR (Right Channel Headphone Output)

Functional Features

• Single-ended or differential input configuration
• Built-in thermal shutdown protection
• Short-circuit and overcurrent protection
• Pop and click suppression during power-up and shutdown
• Low quiescent current in shutdown mode

Advantages and Disadvantages

Advantages: - High-performance audio amplification - Wide voltage range operation allows compatibility with various power sources - Small form factor enables integration into compact devices - Low power consumption for extended battery life - Built-in protection features ensure reliable operation

Disadvantages: - Limited output power compared to higher wattage amplifiers - May require additional external components for optimal performance in certain applications

Working Principles

The LM4855LQ/NOPB is a class AB audio amplifier that utilizes a bridge-tied load (BTL) configuration. It amplifies the audio signal received from the input channels and drives the corresponding output channels, such as speakers or headphones. The amplifier operates within a specified voltage range and provides high-quality audio amplification while minimizing power consumption.

Detailed Application Field Plans

The LM4855LQ/NOPB is suitable for a wide range of portable audio applications, including but not limited to: - Mobile phones - Tablets - Portable media players - Bluetooth speakers - Gaming devices - Personal digital assistants (PDAs)

Detailed and Complete Alternative Models

1. TPA3116D2: Class D audio amplifier with higher output power and efficiency.
2. MAX98357A: Integrated audio amplifier with digital audio interface capabilities.
3. TDA7498E: Dual BTL class D audio amplifier with higher output power and low distortion.

These alternative models offer different features and specifications, providing options for various audio amplification requirements.

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