MAX9791CETI+

Audio Amplifiers Overview

The MAX9791CETI+ is a Windows Vista-compliant audio amplifier IC integrating a stereo Class D speaker amplifier, a DirectDrive headphone amplifier, and an LDO regulator. It operates on a single supply from 2.7V to 5.5V with a 1.8V LDO output. The device provides up to 2.2W of speaker power at 4Ω and 180mW per channel for headphones at 32Ω. Key electrical parameters include 107dB DC PSRR, 0.006% THD+N, and -81dB click-and-pop suppression. It functions within a temperature range of -40°C to +85°C.

Audio Amplifiers Feature Summary

• DirectDrive architecture eliminates large DC-blocking capacitors by producing ground-referenced outputs from a single supply.
• Ground sense feature minimizes headphone crosstalk and ground-loop noise by correcting voltage differences in the ground return trace.
• Spread-spectrum modulation and active emissions limiting ensure low RF susceptibility and compliance with EMI standards.
• Wake-on-beep function allows amplifiers to activate upon detection of a qualified beep signal.

Audio Amplifiers Applications

• Notebook Computers
• Tablet PCs
• Portable Multimedia Players

Audio Amplifiers Procurement Notes

Verify the specific ordering suffix 'C' corresponds to the required 1.8V LDO output voltage before procurement. Confirm package availability in the 28-pin TQFN-EP format. Ensure the component meets RoHS compliance requirements for your manufacturing process. Cross-reference the manufacturer's latest datasheet revision to confirm pinout and electrical characteristics remain unchanged.

Audio Amplifiers Selection Notes

Select this component when a single-supply solution is required for both speakers and headphones. The integrated LDO simplifies power distribution by providing a dedicated rail for internal circuitry. The DirectDrive feature reduces external component count and board space compared to traditional AC-coupled designs. Verify that the system's ground topology supports the COM and SENSE inputs for optimal noise performance.

Audio Amplifiers Part Context

This part belongs to the MAX9791/MAX9792 family of Windows Vista-compliant audio amplifiers. The MAX9791 variant specifically offers a stereo Class D speaker amplifier configuration. It is designed for portable multimedia applications requiring high efficiency and low distortion. The family integrates multiple audio functions into a compact thermal-efficient package.

Audio Amplifiers Replacement Considerations

MAX9791AETI+

Audio Amplifiers FAQ

How does the DirectDrive architecture benefit the design?

It produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, which saves cost, board space, and component height.

What is the purpose of the ground sense feature?

It senses and corrects for the voltage difference between the output jack ground and device signal ground, minimizing headphone amplifier crosstalk and ground-loop noise.