LM4871LD

Product Overview

Category: Integrated Circuit (IC)

Use: Audio Power Amplifier

Characteristics: - Small size and low power consumption - High efficiency and low distortion - Wide supply voltage range - Built-in thermal shutdown protection - Suitable for portable audio devices

Package: DIP-8 (Dual In-line Package)

Essence: The LM4871LD is a mono audio power amplifier IC designed for 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: 1.1W (typical) at 5V, 10% THD+N, 8Ω load
• Efficiency: 85% (typical) at 5V, 1.1W output power, 8Ω load
• Total Harmonic Distortion + Noise (THD+N): 0.2% (typical) at 5V, 1.1W output power, 8Ω load
• Shutdown Current: 0.01μA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4871LD has a total of 8 pins arranged as follows:

____ VDD | | OUT GND | | IN- SHDN | | IN+ |____|

• VDD: Positive power supply pin
• GND: Ground pin
• OUT: Speaker output pin
• IN-: Negative input pin
• IN+: Positive input pin
• SHDN: Shutdown control pin

Functional Features

• Low quiescent current consumption
• Thermal shutdown protection
• Short-circuit and thermal overload protection
• Pop and click suppression circuitry
• External gain configuration option

Advantages

• Small size and low power consumption make it suitable for portable devices
• High efficiency results in longer battery life
• Low distortion provides high-quality audio output
• Built-in protection features ensure safe operation

Disadvantages

• Limited output power may not be sufficient for high-power audio applications
• Mono configuration limits stereo sound reproduction

Working Principles

The LM4871LD is a class AB mono audio power amplifier. It amplifies the audio signal received at the input pins (IN+ and IN-) and drives the speaker connected to the OUT pin. The amplifier operates by modulating the supply voltage based on the input signal, resulting in amplified audio output.

Detailed Application Field Plans

The LM4871LD is commonly used in various portable audio devices, including: - Mobile phones - MP3 players - Portable gaming consoles - Bluetooth speakers - Personal digital assistants (PDAs)

Alternative Models

Some alternative models that can be considered as replacements for the LM4871LD are: - LM4861: Stereo audio power amplifier IC with similar characteristics - TPA3116D2: Class D audio amplifier IC with higher output power capability - MAX98357A: Mono audio amplifier IC with integrated digital audio interface

These alternative models offer different features and specifications, allowing designers to choose the most suitable option for their specific application requirements.

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