LM4915LQ/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: LQFP (Low Profile Quad Flat Package)

Essence: The LM4915LQ/NOPB is a low voltage stereo audio power amplifier IC designed for portable devices such as mobile phones, tablets, and portable media players. It provides high-quality audio amplification with various protection features.

Packaging/Quantity: The LM4915LQ/NOPB is available in a 48-pin LQFP package. It is typically sold in reels of 2500 units.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Output Power: Up to 1.4W per channel into 3Ω load at 5V supply
• Total Harmonic Distortion + Noise (THD+N): 0.1% (typical) at 1kHz, 1.2W output power
• Efficiency: 85% (typical) at 1.2W output power
• Shutdown Current: 0.01μA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4915LQ/NOPB has a total of 48 pins. Here is the detailed pin configuration:

Functional Features

• Low voltage operation allows usage in battery-powered devices.
• Stereo configuration enables the amplification of left and right audio channels.
• High output power capability ensures sufficient volume for various applications.
• Wide supply voltage range provides flexibility in different power supply scenarios.
• Thermal shutdown protection prevents the IC from overheating.
• Short-circuit protection safeguards against damage caused by shorted outputs.
• Pop and click suppression circuitry reduces noise during power on/off transitions.

Advantages

• Compact size and low profile package make it suitable for portable devices.
• High-quality audio amplification with low distortion and noise.
• Efficient power consumption extends battery life.
• Protection features enhance reliability and durability.
• Easy integration into existing audio systems.

Disadvantages

• Limited output power compared to higher wattage amplifiers.
• Not suitable for high-power audio applications.
• Requires external components for proper operation.

Working Principles

The LM4915LQ/NOPB is a class AB audio amplifier that utilizes a bridge-tied load (BTL) configuration. It amplifies the audio signal received from the input source and drives the connected speakers or headphones. The IC operates on a low voltage supply, typically provided by a battery, and converts the low-level audio signal into a higher power output suitable for listening.

Application Field Plans

The LM4915LQ/NOPB can be used in various portable audio applications, including: 1. Mobile phones 2. Tablets 3. Portable media players 4. Bluetooth speakers 5. Gaming devices 6. Personal audio devices

Alternative Models

Here are some alternative models that offer similar functionality: 1. LM4863: Dual 2.2W Audio Amplifier 2. TPA3110D2: 15W Stereo Class D Audio Power Amplifier 3. MAX98357A: Mono 3.2W Class D Audio Amplifier

These alternative models can be considered based on specific requirements and design constraints.

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