MAX9750CETI+T

Audio Amplifiers Overview

The MAX9750CETI+T is a stereo audio amplifier integrating a 2.6W Class AB BTL speaker driver and a 110mW DirectDrive headphone amplifier. It operates on a single 4.5V to 5.5V supply with a typical quiescent current of 29mA in speaker mode. The device features industry-leading click-and-pop suppression, high 90dB PSRR, and low 0.01% THD+N. It includes an analog volume control, selectable gain settings (10.5dB), and logic-selectable shutdown. Packaged in a 28-pin Thin QFN (5mm x 5mm) for space-constrained portable applications.

Audio Amplifiers Feature Summary

• DirectDrive architecture eliminates bulky DC-blocking capacitors by generating an internal negative supply via a charge pump.
• Integrated analog volume control allows precise gain adjustment based on applied DC voltage at the VOL pin.
• Automatic headphone detection via HPS input switches between speaker and headphone modes.
• Comprehensive protection against thermal overload, output short circuits, and ±8kV ESD strikes.

Audio Amplifiers Applications

• Notebook PCs
• Tablet PCs
• Flat-Panel TVs
• Portable DVD Players

Audio Amplifiers Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging when sourcing. Confirm the 'C' variant corresponds to the 10.5dB gain setting. Ensure the component meets RoHS compliance standards as indicated by the '+' designation. Cross-reference the manufacturer's latest datasheet revision to confirm pinout and electrical characteristics remain unchanged.

Audio Amplifiers Selection Notes

Select this part for designs requiring combined speaker and headphone amplification without external coupling capacitors. The 10.5dB gain setting suits moderate drive requirements. Consider the 28-pin Thin QFN package constraints for PCB layout. Verify that the system power supply remains within the 4.5V to 5.5V range for optimal performance.

Audio Amplifiers Part Context

This component belongs to the MAX9750/MAX9751/MAX9755 family from Analog Devices/Maxim Integrated. It specifically denotes the version with fixed 10.5dB gain and analog volume control. The family shares core DirectDrive technology but differs in input multiplexing and gain configurations. It serves as a compact solution for multimedia devices needing integrated audio output stages.

Audio Amplifiers Replacement Considerations

MAX9750AETI+ offers higher gain options (13.5dB). MAX9750BETI+ provides even higher gain (19.5dB). MAX9751ETI+ replaces the volume control with a 2:1 input multiplexer. All share the same 28-pin Thin QFN package and basic functionality.

Audio Amplifiers FAQ

How does the DirectDrive architecture benefit the design?

It generates an internal negative supply using a charge pump, allowing the headphone output to be biased at ground. This eliminates the need for large external DC-blocking capacitors, saving board space and cost.

What is the function of the HPS pin?

The Headphone Sense (HPS) pin automatically detects headphone insertion. A voltage above 2V enables the headphone amplifier and disables the speaker amplifier, while below 0.8V it enables the speaker amplifier.

Does the MAX9750CETI+ include input multiplexing?

No, the MAX9750CETI+ features an analog volume control and BEEP input. Input multiplexing is available only in the MAX9751 variant.