MAX9717DEUA+

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The MAX9717DEUA+ is a thermally-improved version of the MAX9717 low-power mono Class AB audio power amplifier. This amplifier is designed to optimize size and efficiency, and can run directly off +2.6V to +5.5V supplies. The MAX9717DEUA+ is ideal for low-power portable applications. It is a versatile, low-cost amplifier that delivers up to 1.3W of continuous average power into 16Ω or 0.85W into 32Ω with efficiency of up to 81%.

The device features 23V/μs slew rate, 0.002% THD+N, and greater than 80dB PSRR. With its low operating voltage, the MAX9717DEUA+ is ideal for applications operating from a single-cell Li-ion battery. The device is available in a space-saving 8-bump µDFN44 mini-plastic package that measures only 1.8mm x 1.2mm, and a UCSP package. The UCSP typically requires no additional board space and is ideal for applications with cramped board real estate.

The MAX9717DEUA+ has a power-saving feature that reduces the quiescent current during standby mode to 1μA. In addition, a fast mute function ensures distortion-free transitions between mute and normal operating modes.

Application Field of MAX9717DEUA+ Operating Principle

The MAX9717DEUA+ is an ideal solution for low-power audio applications, such as portable sound systems, tablet computers, and other battery-powered devices. It is suitable for low-power mono or stereo audio amplifiers in space-constrained application designs. The MAX9717DEUA+ can also be used as an audio booster for audio output systems, for small-signal audio amplification, and as a stand-alone portable amplifier.

The MAX9717DEUA+ features a Class AB output stage that reduces power-supply ripple noise to less than 80dB and provides a near distortion-free signal at high output powers. The MAX9717DEUA+ utilizes a low-voltage, current-limited circuit architecture that is protected against short-circuit and over-temperature conditions. The class AB output stage provides improved signal-to-noise ratio and improved THD+N at low distortion levels.

The MAX9717DEUA+ integrates an input gain stage and a power amplifier stage along with active AC and DC protection circuitry. The gain stage amplifies the audio signal to an optimal projection level, and the power amplifier stage amplifies the signal to the desired speaker level. The device is capable of providing up to 1.3W into 16Ω or 0.85W into 32Ω when running from a 5V supply.

Conclusion

The MAX9717DEUA+ is a versatile, low-cost amplifier that delivers high performance in a small footprint. Its low-voltage, current-limited architecture ensures protection against short-circuit and over-temperature conditions, and its Class AB output stage reduces power-supply ripple noise to less than 80dB and provides a near distortion-free signal at high output powers. Thanks to its thermally-improved design and highly efficient topology, the MAX9717DEUA+ is the perfect choice for portable sound systems, tablet computers, and other battery-powered applications.

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