MAX9720AEBE+T

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The MAX9720AEBE+T is an integrated audio amplifier that combines the features of versatile power, low-voltage operation, low supply-current requirements, and low power-supply noise into a single package. It is particularly suited to portable, battery-powered applications. The MAX9720AEBE+T is designed to power 8Ω/16Ω speakers at a high-density level in such applications as cell phones, tablets, set top boxes, sound bars, car radios, Bluetooth speakers, and portable video-game systems.

The MAX9720AEBE+T, operating on 3.3V power supply, is based on the voltage-feedback architecture which is optimized for THD+N and has a 1kHz power-supply rejection ratio (PSRR) of 71dB, valid for a 100mV power-supply ripple at a supply voltage of 5V and 6V. In addition, it includes an integrated 1.9A switching current regulator which saves board space, improves system efficiency and is suitable for powering high-efficiency stereo speakers.

The MAX9720AEBE+T features a differential ground-referenced amplifier output that contains a low distortion, low noise amplifier. It is also capable of driving beyond 2.5W of power into an 8Ω speaker at 20% THD+N and is capable of driving a 16Ω speaker with up to 20W of peak power. Its low dynamic-current requirements, low power supply noise, and high-power output capability make it suitable for a wide range of audio applications.

The MAX9720AEBE+T amplifier operates from a single power supply ranging from 3.3V to 6V. The supply current is dynamically adjusted based on the output level, allowing for lower total power consumption and improved battery life. The supply current of the amplifier is maintained at 18mA with a 1.5W output on an 8Ω load. The maximum power capability when operating on a 5V supply is 2.1W with a THD+N of 0.2%.

The output current and power stage of the MAX9720AEBE+T is controlled by a low-noise, high-bandwidth Class-AB output stage implementation in which the power transistors are configured as two parallel pairs of transistors. This feature results in higher efficiency, greater linearity, and reduced output impedance. The output stage is also designed to operate over a wide range of supply voltages, allowing for low supply ripple and a high power-supply rejection ratio at the output.

The MAX9720AEBE+T incorporates a programmable input gain control for left and right channels with a range of 8dB to 40dB of gain in 1dB steps. It also contains a sequencer for powering up the amplifier and for setting the gain for each output. Additionally, the amplifier includes both soft start and shutdown circuits that are designed to minimize transients and reduce thermal stress.

In summary, the MAX9720AEBE+T is an integrated audio amplifier that combines low voltage operation, low power consumption, low noise, and low distortion into a single package. It is particularly suited for portable, battery-powered applications and features a differential amplifier output with a wide range of gains and a high PSRR at the output. It has the capability to drive beyond 2.5W of power on 8Ω/16Ω speakers and is capable of driving high efficiency stereo speakers.

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