LM4873MT/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Audio Power Amplifier

Characteristics: - High efficiency - Low distortion - Small package size - Wide supply voltage range

Package: 14-pin TSSOP (Thin Shrink Small Outline Package)

Essence: The LM4873MT/NOPB is a high-performance audio power amplifier IC designed for portable electronic devices such as smartphones, tablets, and portable media players.

Packaging/Quantity: The LM4873MT/NOPB is typically sold in reels containing 2500 units.

Specifications

• Supply Voltage Range: 2.7V to 5.5V
• Output Power: Up to 1.1W per channel into 8Ω load at 5V supply
• Total Harmonic Distortion + Noise (THD+N): 0.1% (typical) at 1kHz, 1W output power
• Efficiency: Up to 90%
• Shutdown Current: 0.01μA (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The LM4873MT/NOPB has the following pin configuration:

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| | | 1 14 | | | | 2 13 | | | | 3 12 | | | | 4 11 | | | | 5 10 | | | | 6 9 | |___________| ```

Pin Description: 1. Shutdown/Enable 2. Input Bypass Capacitor 3. Input Signal 4. Ground 5. Output Bypass Capacitor 6. Output 7. NC (No Connection) 8. NC (No Connection) 9. NC (No Connection) 10. NC (No Connection) 11. NC (No Connection) 12. NC (No Connection) 13. VDD (Positive Power Supply) 14. NC (No Connection)

Functional Features

• Low quiescent current consumption
• Thermal shutdown protection
• Short-circuit and over-temperature protection
• Pop and click suppression during power-up and shutdown
• External gain configuration option

Advantages and Disadvantages

Advantages: - High efficiency leads to longer battery life in portable devices - Small package size allows for space-saving designs - Low distortion ensures high-quality audio output - Wide supply voltage range provides flexibility in various applications

Disadvantages: - Limited output power compared to higher wattage amplifiers - Not suitable for high-power audio systems or large speakers

Working Principles

The LM4873MT/NOPB is a class AB audio power amplifier that amplifies low-power audio signals from sources such as microphones or audio playback devices. It operates by receiving an input signal, amplifying it, and delivering the amplified signal to an external speaker or headphone.

The amplifier utilizes a bridge-tied load (BTL) configuration, which allows for a single-ended input and a differential output. This configuration helps eliminate the need for an output coupling capacitor, reducing component count and cost.

Detailed Application Field Plans

The LM4873MT/NOPB is commonly used in various portable electronic devices where audio amplification is required. Some application fields include:

1. Smartphones and tablets
2. Portable media players
3. Bluetooth speakers
4. Gaming consoles
5. Personal digital assistants (PDAs)

Detailed and Complete Alternative Models

1. LM4863MT/NOPB: Similar to LM4873MT/NOPB, but with lower output power.
2. LM4890MT/NOPB: Higher output power version of LM4873MT/NOPB.
3. TPA3116D2: Class D audio amplifier with higher efficiency and power capabilities.

These alternative models offer different features and specifications to cater to specific application requirements.

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