LM4871MM

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 - Suitable for portable audio devices

Package: Miniature 8-pin MSOP package

Essence: LM4871MM is a high-performance audio power amplifier IC designed for portable audio applications.

Packaging/Quantity: Available in reels of 2500 units

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Output Power: 750mW (typical) into 8Ω at 5V
• Total Harmonic Distortion: 0.1% (typical) at 1kHz, 150mW into 8Ω
• Efficiency: 90% (typical) at 300mW into 8Ω
• Shutdown Current: 0.01μA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4871MM has the following pin configuration:

```

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| | --| VDD GND|-- --| IN+ SHDN|-- --| IN- OUT|-- |___________| ```

Pin Description: - VDD: Positive power supply - GND: Ground reference - IN+: Non-inverting input - SHDN: Shutdown control input - IN-: Inverting input - OUT: Amplifier output

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 and Disadvantages

Advantages: - Small size and low power consumption make it ideal for portable devices - High efficiency results in longer battery life - Low distortion ensures high-quality audio output - Wide supply voltage range allows flexibility in power source selection

Disadvantages: - Limited output power compared to larger audio amplifiers - Not suitable for high-power audio applications

Working Principles

The LM4871MM is a class AB audio power amplifier that amplifies the input audio signal and drives a speaker or headphone. It operates by receiving an audio input signal through the non-inverting (IN+) and inverting (IN-) inputs. The amplified audio signal is then delivered to the output pin (OUT) to drive the connected load.

Detailed Application Field Plans

The LM4871MM is commonly used in various portable audio devices, including: - Mobile phones - MP3 players - Portable gaming consoles - Personal digital assistants (PDAs) - Bluetooth speakers - Portable radios

Alternative Models

Some alternative models to LM4871MM include: - LM4861: Similar features and performance, but with a different package - TPA301: Higher output power and additional features, suitable for higher-power applications - MAX98357A: Integrated digital audio interface and higher output power capabilities

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

In conclusion, the LM4871MM is a compact and efficient audio power amplifier IC designed for portable audio applications. Its small size, low power consumption, and high-quality audio output make it suitable for a wide range of portable devices. However, its limited output power may restrict its use in high-power audio applications. Designers can consider alternative models based on their specific needs.