MAX9777ETI+

Audio Amplifiers Overview

The MAX9777ETI+ is a stereo audio power amplifier integrating a 3W bridge-tied load (BTL) speaker driver and a single-ended headphone amplifier within a 28-pin thin QFN package. It operates from a single 4.5V to 5.5V supply, featuring an industry-leading 100dB PSRR at 1kHz. The device delivers up to 3W into a 3Ω load in speaker mode and 200mW into a 16Ω load in headphone mode. Key electrical parameters include a typical quiescent current of 13mA, a shutdown current of 10µA, and ultra-low THD+N of 0.002%. It incorporates a 2:1 input multiplexer, headphone sensing, click-and-pop suppression, and thermal protection.

Audio Amplifiers Feature Summary

• Integrates a 3W BTL stereo speaker amplifier with a 200mW stereo headphone amplifier
• Features an ultra-high 100dB power-supply rejection ratio for operation on noisy supplies
• Includes a 2:1 input multiplexer for selecting between multiple audio sources or equalization networks
• Provides automatic headphone detection via the HPS input to switch between speaker and headphone modes

Audio Amplifiers Applications

• Notebooks
• Portable DVD Players
• Tablet PCs
• PC Audio Peripherals
• Multimedia Monitors

Audio Amplifiers Procurement Notes

Verify the specific ordering suffix ETI+ confirms the I2C-compatible control interface and lead-free packaging status. Confirm the 28-pin Thin QFN package dimensions match the design constraints. Ensure the component meets the required -40°C to +85°C operating temperature range for the intended application environment.

Audio Amplifiers Selection Notes

Select the MAX9777ETI+ when an I2C-compatible digital interface is required for gain, mute, and input selection control. This model is distinct from the MAX9778, which utilizes parallel logic inputs. Consider the low quiescent current and shutdown features for battery-powered designs requiring extended operational life.

Audio Amplifiers Part Context

The MAX9777ETI+ belongs to the MAX9777/MAX9778 family of stereo audio amplifiers. It is manufactured by Analog Devices Inc./Maxim Integrated. The device is designed to replace discrete amplifier solutions by combining speaker drive, headphone drive, and signal routing functions into a single compact integrated circuit.

Audio Amplifiers Replacement Considerations

The MAX9778ETI+ serves as a functional substitute if parallel control logic is preferred over the I2C interface. Verify pin compatibility and software register mapping differences before implementation.