LM4934RLX/NOPB

Product Overview

• Category: Audio Amplifier
• Use: The LM4934RLX/NOPB is an audio amplifier designed for use in portable electronic devices such as smartphones, tablets, and portable media players.
• Characteristics: It is a low-power audio amplifier with integrated boost converter, speaker driver, and headphone amplifier. It is designed to deliver high-quality audio output while minimizing power consumption.
• Package: The LM4934RLX/NOPB is available in a small outline package (SOP) with a specified footprint and pin configuration.
• Essence: The essence of this product lies in its ability to provide efficient audio amplification in a compact and energy-efficient package.
• Packaging/Quantity: The LM4934RLX/NOPB is typically packaged in reels or tubes, with a quantity per package specified by the manufacturer.

Specifications

• Power Supply Voltage: 2.7V to 5.5V
• Output Power: Up to 1.3W into 8Ω load
• Total Harmonic Distortion + Noise (THD+N): 0.1% at 1kHz, 1.2W, 8Ω
• Headphone Amplifier Output Power: 40mW into 32Ω at 3.6V
• Boost Converter Efficiency: Up to 90%
• Operating Temperature Range: -40°C to 85°C

Detailed Pin Configuration

The LM4934RLX/NOPB features a total of 24 pins, including power supply pins, input and output pins, control pins, and ground pins. The detailed pin configuration is as follows:

| Pin Number | Pin Name | Description | |------------|---------------|--------------------------------------------------| | 1 | VDD | Power Supply Voltage Input | | 2 | VDDA | Analog Power Supply Voltage Input | | 3 | VDDC | Boost Converter Power Supply Voltage Input | | 4 | VSS | Ground | | 5 | VSSA | Analog Ground | | 6 | VSSC | Boost Converter Ground | | 7 | SD | Shutdown Control Input | | 8 | MODE | Mode Selection Input | | 9 | BST | Boost Converter Output | | 10 | OUTP | Speaker Positive Output | | 11 | OUTN | Speaker Negative Output | | 12 | HPL | Left Headphone Positive Output | | 13 | HPR | Right Headphone Positive Output | | 14 | HPM | Headphone Common Output | | 15 | HPZ | Headphone Negative Output | | 16 | INP | Positive Differential Input | | 17 | INN | Negative Differential Input | | 18 | AGND | Analog Ground | | 19 | BYP | Bypass Capacitor Connection | | 20 | VREF | Reference Voltage Output | | 21 | VCM | Common Mode Voltage Input | | 22 | VDDIO | Digital I/O Power Supply Voltage Input | | 23 | SDA | I2C Serial Data Input/Output | | 24 | SCL | I2C Serial Clock Input |

Functional Features

• Integrated Boost Converter: The LM4934RLX/NOPB includes a boost converter to efficiently generate the required voltage for the audio amplifier section, allowing operation from a single-cell lithium-ion battery.
• Speaker Driver: It provides a dedicated speaker driver capable of delivering high-quality audio output to external speakers.
• Headphone Amplifier: The integrated headphone amplifier ensures clear and powerful audio output to headphones or earphones.
• Shutdown Control: The device features a shutdown control input for power management and conservation.

Advantages and Disadvantages

Advantages

• Compact Integration: The LM4934RLX/NOPB integrates multiple audio functions into a single package, saving board space and simplifying design.
• Low Power Consumption: With its efficient boost converter and low-power audio amplification, it helps extend battery life in portable devices.
• High-Quality Audio: The device delivers high-quality audio output to both speakers and headphones, enhancing the user experience.

Disadvantages

• Limited Output Power: While suitable for portable devices, the maximum output power may not be sufficient for high-power audio applications.

Working Principles

The LM4934RLX/NOPB operates by receiving audio input signals, amplifying them using the integrated boost converter, and driving the