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20W stereo Class D speaker amplifier operates from a 4.5V to 14V supply

Sunnyvale, Calif.—Maxim Integrated Products is calling its MAX9744 the industry's first 20W stereo Class D speaker amplifier to operate from a 4.5V to 14V power supply.

The wide supply range minimizes the cost of portable designs by reducing component count and allowing the use of a smaller battery pack. The MAX9744 provides ample output power throughout the power-supply voltage range, making it suitable for MP3 docking stations, gaming consoles, and flat-panel televisions.
Additionally, the MAX9744 integrates 64-step analog and digital volume control. In analog mode, the volume range is ratiometric relative to VDD. To ramp up or down the volume digitally, the system microcontroller can program a 6-bit register through the MAX9744's I²C interface.

External feedback resistors set the input gain, while the output has an internally set gain. When powered from a 12V supply, the MAX9744 combines these gains with the wide volume-control range, and delivers 20W per channel into 4ohm speakers.

Class D amplifiers are known for high power efficiency, and the MAX9744 does not disappoint with its 93% efficiency while delivering 20W into an 8ohm load. Achieving high 75dB PSRR, low 0.04% THD+N, and greater than 90dB SNR, this stereo amplifier offers Class AB performance with Class D efficiency.

The MAX9744 includes a low-power shutdown mode, a mute function, and integrated click-and-pop suppression. Available in a 7mm x 7mm x 0.8mm, 44-pin TQFN package, the device is fully specified over the -40°C to +85°C extended temperature range. An evaluation kit is available to speed design implementation.

Pricing: Starts at $2.45 (1000-up, FOB USA).
Availability: Now.
Datasheet: Click here.

Maxim Integrated Products, www.maxim-ic.com

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