According to the company, the MAX98300 and MAX98302 mono/stereo 2.4-W/channel class D amplifiers from Maxim Integrated Products achieve the industry’s lowest power consumption. Also, they don’t need any EMI-suppression (electromagnetic interference) components.

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Maxim says that the amps achieve supply current as low as 700 µA/channel without sacrificing EMI suppression, clipping behavior, noise performance, or click-and-pop levels. In fact, the company says, these features all have been improved. In real-world conditions, where competing ICs require EMI-suppression components, Maxim says that the amps consume 90% less quiescent power than the nearest competitive solution.

Maxim attributes its claim to the industry’s lowest EMI emissions to patented EMI reduction techniques and careful circuit design. These amps also are designed to eliminate the need for the output filtering found in traditional class D devices. This EMI performance makes it easy to pass FCC and CE EMI limits, the company says, while avoiding interference with other sensitive circuits.

No filtering components are required with speaker cable or trace lengths of 24 in. and beyond, so the MAX98300 and MAX98302 can save significant board space and supply current. They also deliver 2.4 W/channel while ensuring clean recovery from clipping events that may occur when they are driven hard to achieve the highest sound-pressure level (SPL) possible.

Furthermore, the devices have a typical offset voltage of ±1 mV and address other sources of click-and-pop noise to ensure the best performance. The MAX98300 and MAX98302 offer five gain settings (6, 9, 12, 15, and 18 dB) and use a single-pin selection method to minimize pin count, package size, and solution size. They operate from 2.6 to 5.5 V and are fully specified from –40°C to 85°C.

The MAX98300 comes in a 0.4-mm pitch, 1.26- by 1.26- by 0.64-mm nine-pin wafer-level package (WLP) and costs $0.42 each in lots of 1000 and up. The MAX98302 comes in a 3- by 3- by 0.75-mm, 14-pin thin dual-inline flat package, exposed pad (TDFN-EP) and costs $0.48 each in lots of 1000 and up. Samples and evaluation kits are available.

Maxim Integrated Products