The PAM8403 from Power Analog Microelectronics is a 3W Class-D audio amplifier. This amplifier offers high efficiency, low THD+N (Total Harmonic Distortion plus Noise), and requires few external components, making it ideal for portable audio devices and other low-power applications.

Applications

• Portable audio players: Used to amplify audio signals in MP3 players, iPods, and other portable music devices.
• USB speakers: Found in small USB-powered speakers for computers and laptops.
• Toys and educational devices: Employed in toys and educational devices requiring audio output.
• DIY audio projects: Popular choice for hobbyists and enthusiasts building custom audio amplifiers.
• Mobile phones and tablets: Amplifies audio for the integrated speakers.

Features

• 3W output at 10% THD with a 4Ω load: Delivers sufficient power for small speakers.
• Class-D amplifier: Offers high efficiency, minimizing power consumption and heat generation.
• Low THD+N: Provides clean and clear audio output with minimal distortion.
• Filterless design: Eliminates the need for external LC filters, reducing component count and cost.
• Short-circuit protection: Protects the amplifier from damage in case of output shorts.

Benefits

• Extended battery life: High efficiency minimizes power consumption, prolonging battery life in portable devices.
• Compact design: Filterless design and small package size allow for compact circuit designs.
• High-quality audio output: Low THD+N ensures clear and distortion-free audio reproduction.
• Cost-effective solution: Requires few external components, reducing overall system cost.
• Easy to use: Simple circuit design and few external components simplify implementation.

Additional Details

The PAM8403 typically operates from a 5V power supply. It includes built-in gain settings, which can be configured using external resistors. It also incorporates thermal shutdown protection, which automatically disables the amplifier if the temperature exceeds a safe limit. The device is usually available in a small surface-mount package, such as a SOP or DIP package, suitable for automated assembly processes.

Technical Specifications:

• Operating Voltage: 2.5V to 5.5V
• Output Power: 3W at 10% THD, 4Ω Load, 5V Supply
• Quiescent Current: Typically 4mA
• Shutdown Current: Typically <1μA
• THD+N: Typically 0.15% at 1W, 4Ω Load, 5V Supply