LM3886T - High-Performance Audio Power Amplifier

Overview

The LM3886T is a high-performance audio power amplifier designed to deliver exceptional sound quality with robust protection features. Capable of providing 68W of continuous average power into a 4Ω load and 38W into an 8Ω load, this amplifier ensures low distortion (0.1% THD + N) across the full audio bandwidth (20 Hz–20 kHz). Its advanced SPiKe™ (Self Peak Instantaneous Temperature) Protection Circuitry safeguards the amplifier against a wide range of fault conditions, making it superior to discrete and hybrid alternatives.

Key Features

• High Output Power: Delivers 68W continuous average power into 4Ω and 38W into 8Ω.
• Low Distortion: Total Harmonic Distortion + Noise (THD + N) of just 0.1% across the audio spectrum.
• SPiKe™ Protection: Comprehensive protection against overvoltage, undervoltage, overloads, short circuits, thermal runaway, and instantaneous temperature spikes.
• Wide Supply Voltage Range: Operates efficiently across a broad range of supply voltages.
• High Signal-to-Noise Ratio (SNR): Ensures clean and clear audio output with minimal background noise.
• Thermal Protection: Built-in safeguards prevent damage due to excessive heat.
• Mute Function: Allows for muting the amplifier to eliminate turn-on/off transients.

Applications

The LM3886T is ideal for a variety of audio applications, including:

• Home Audio Systems: High-fidelity amplifiers for stereo and surround sound systems.
• Professional Audio Equipment: Power amplifiers for studio monitors, PA systems, and live sound reinforcement.
• Automotive Audio: High-power audio amplification for car audio systems.
• Multimedia Speakers: High-performance amplification for computer and gaming audio systems.
• DIY Audio Projects: Popular among hobbyists for building custom amplifiers due to its reliability and ease of use.

Electrical Characteristics

The following table summarizes the key electrical specifications of the LM3886T under typical operating conditions (unless otherwise noted):

Absolute Maximum Ratings

• Supply Voltage (VCC): ±42V
• Output Current: 7A (peak)
• Power Dissipation: Internally limited
• Operating Temperature Range: -20°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (VCC): ±20V to ±28V
• Load Resistance: 4Ω to 8Ω
• Operating Temperature: 0°C to +70°C

Performance Characteristics

• Output Power (4Ω, THD = 0.1%): 68W (continuous average)
• Output Power (8Ω, THD = 0.1%): 38W (continuous average)
• Total Harmonic Distortion + Noise (THD + N): 0.1% (20 Hz–20 kHz)
• Signal-to-Noise Ratio (SNR): >92 dB (A-weighted)
• Input Impedance: 150 kΩ
• Gain Bandwidth Product: 8 MHz
• Slew Rate: 19 V/µs

Package Information

The LM3886T is available in a robust and industry-standard package, ensuring ease of integration into various designs.

Package Type

• Package: TO-220-11 (also known as Multiwatt11)
• Pin Count: 11
• Mounting Style: Through-hole
• Dimensions: 20.0 mm x 10.0 mm x 4.5 mm (approximate)
• Weight: Approximately 2.5 grams

Pin Configuration

The pinout of the LM3886T is as follows:

• Pin 1: Mute
• Pin 2: Negative Input (-IN)
• Pin 3: Positive Input (+IN)
• Pin 4: V- (Negative Supply)
• Pin 5: Not Connected (NC)
• Pin 6: V+ (Positive Supply)
• Pin 7: Output
• Pin 8: Bootstrap
• Pin 9: Ground (GND)
• Pin 10: Not Connected (NC)
• Pin 11: Not Connected (NC)

Conclusion

The LM3886T is a versatile and high-performance audio power amplifier that combines excellent sound quality with robust protection features. Its ability to deliver high power with low distortion makes it suitable for a wide range of audio applications, from home entertainment systems to professional audio equipment. The inclusion of SPiKe™ Protection ensures reliable operation under demanding conditions, making it a preferred choice for both commercial and DIY audio projects.