The MAX9775ETJ is a high-efficiency, mono Class G headphone amplifier from Maxim Integrated (formerly Dallas Semiconductor). This amplifier is designed to deliver high-quality audio while minimizing power consumption, making it suitable for portable audio devices and other battery-powered applications. It features an integrated charge pump that provides a boosted supply voltage, enabling higher output power and improved audio performance.

Applications

• Portable media players (PMPs)
• Mobile phones
• Tablets
• Notebook computers
• Gaming devices

Features

• High efficiency Class G amplifier: Minimizes power consumption and extends battery life.
• Integrated charge pump: Boosts supply voltage for higher output power.
• Low THD+N: Delivers high-fidelity audio with minimal distortion.
• Click-and-pop suppression: Eliminates audible artifacts during power-up and power-down.
• Short-circuit and thermal overload protection: Protects the amplifier from damage due to fault conditions.
• Adjustable gain: Allows for customization of output level.
• Small package size: Available in a compact TQFN package for space-constrained applications.

Benefits

• Extended battery life: High efficiency reduces power consumption, prolonging the operational time of portable devices.
• Improved audio quality: Low distortion and click-and-pop suppression provide a superior listening experience.
• Increased output power: The integrated charge pump enables higher output power for driving headphones effectively.
• Enhanced system reliability: Protection features prevent damage from short circuits and thermal overloads.
• Simplified design: Integrated components reduce the number of external components required.

Additional Details

The MAX9775ETJ operates from a single 2.5V to 5.5V supply. The Class G architecture dynamically adjusts the supply voltage to the output stage based on the audio signal level, minimizing power dissipation. The integrated charge pump provides a regulated voltage that is higher than the supply voltage, allowing the amplifier to deliver more power to the headphones. The device includes comprehensive protection features, such as short-circuit protection, thermal overload protection, and undervoltage lockout. The gain can be adjusted using external resistors, allowing designers to customize the output level to match the specific headphones being used. The MAX9775ETJ is available in a thermally efficient TQFN package, which helps to dissipate heat and maintain optimal performance. The amplifier also features a shutdown mode that reduces current consumption to a minimum when the device is not in use.