This compact stereo amplifier delivers impressive power in a tiny package, capable of providing 2 x 3.7W into 3-ohm speakers. Ideal for portable, battery-powered projects, it operates from 2.7V to 5.5VDC, boasting over 90% efficiency, especially when driving 8Ω speakers. It features built-in thermal and over-current protection, remaining cool under load. Here's an overview of its key features:
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Output Power:
- 3.7W at 3Ω, 10% THD
- 1.7W at 8Ω, 10% THD (with 5V supply)
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Class D Efficiency: Over 90% efficient, making it perfect for portable applications.
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Input: Fully differential with 1.0uF capacitors; can easily work with non-differential outputs by grounding the R- and L- terminals.
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Bridge-Tied Output: Direct connection to speakers with no ground, producing a 360KHz PWM output that’s averaged by the speaker coil, making high frequencies inaudible.
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Convenient Setup:
- Comes with a fully assembled and tested breakout board.
- Includes pre-soldered 3.5mm screw-terminal blocks for easy speaker connection.
- Features a pre-soldered 2x4 header and a jumper for adjusting amplifier gain.
- Plug it into a breadboard and be ready in minutes.
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Gain Options: Select from five pin-selectable gains: 6dB, 9dB, 12dB, 15dB, and 18dB.
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Performance:
- High 83dB PSRR at 217Hz
- Spread-Spectrum Modulation and Active Emissions Limiting
- Excellent click-and-pop suppression
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Protection: Thermal and short-circuit/over-current protection built-in.
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Low Power Consumption: Only 2mA quiescent current and 10uA in shutdown mode.
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Speaker Compatibility: Works with 3Ω or greater impedance speakers (not included).
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Compact Size: Product dimensions: 28.1mm x 24.0mm x 10.4mm (1.1" x 0.9" x 0.4").
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Weight: 4.6g (0.2oz).
Revision History:
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April 10, 2024: Board now includes pre-soldered terminal blocks and 2x4 header.
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December 5, 2022: PCB updated with a clearer silkscreen design (Adafruit Pinguin) for better legibility.