PAM8302 2.5W Class D Audio Amplifier Module, Efficiency Mono Board for 4 Ohm Speaker Projects

Compact Class D mono amplifier module providing up to 2.5 watts into 4 ohm speakers and clean operation in portable electronics. Why you need this efficiency for battery projects: Class D design delivers more than 90% efficiency when driving an 8 ohm speaker at over 0.5 watt, minimizing heat and conserving power. Small footprint, big output: at 25 mm by 16 mm the board fits into compact enclosures while delivering up to 2.5 W into 4 ohm loads. Builtin protections and control: thermal and overcurrent protection, very low quiescent current, and an onboard trim pot let you tune loudness without extra components. Key features Amplifier chip: PAM8302 class D mono amplifier Output power (with 5.5 V supply): 2.5 W into 4 ohm at 10% THD; 1.5 W into 8 ohm at 10% THD Supply range: 2.0 V to 5.5 V DC Very efficient: over 90% efficiency in typical smallspeaker conditions Low current draw: 4 mA quiescent; 1 microamp in shutdown mode Gain: fixed 24 dB with onboard trim potentiometer to reduce input level Inputs: A+ and A pass through 1.0 microfarad capacitors for differential operation; tie Audio to ground for singleended sources Output: bridgetied load, driven directly to speaker pins; uses a 250 kHz PWM output that the speaker averages, switching frequency is inaudible Filterless output with ferrite bead plus capacitors 50 dB power supply rejection ratio at 1 kHz Protections: thermal shutdown and shortcircuit / overcurrent protection Dimensions: 25 mm x 16 mm Installation and compatibility notes Designed to drive speakers directly. Do not connect the bridgetied outputs into another amplifier input. For singleended audio sources, connect Audio to ground and feed the signal into Audio+ through the input coupling capacitor or a source with DC blocking. Use 4 to 8 ohm speakers for rated power performance. Ideal for batterypowered and USBpowered projects due to low voltage range and efficiency. Practical use scenarios Portable Bluetooth speaker project: compact amplifier board pairs with a small battery and speaker to produce clear, efficient audio in a tiny enclosure. Handheld electronics and DIY gadgets: add audible alerts, voice prompts, or simple music playback where space and power efficiency are limited. Embedded systems and kiosks: drive a single lowimpedance speaker directly from a microcontroller audio output or media player with minimal external components. Technical reminders Output waveform is frequency PWM; external filtering is not required for direct speaker loads but may be needed if electromagnetic interference is a concern in your design. The onboard trim pot allows reducing the default 24 dB gain for quieter sources or to match input sensitivity. The amplifier includes thermal and shortcircuit protections but still follow good design practices for speaker wiring and heat dissipation. This compact class D module provides an efficient, protected, and adjustable audio output solution for a wide range of smallscale audio projects.