MAX9791BETI+

Audio Amplifiers Overview

The MAX9791BETI+ is a Windows Vista-compliant Class D speaker amplifier with a DirectDrive headphone amplifier and an integrated 120mA low-dropout linear regulator. It operates on a single supply voltage ranging from 2.7V to 5.5V. The device features a stereo speaker amplifier, a stereo headphone amplifier, and a 3.3V LDO output. It includes wake-on-beep functionality, click-and-pop suppression, and independent shutdown controls for the speaker, headphone, and LDO sections.

Audio Amplifiers Feature Summary

• DirectDrive headphone amplifier architecture eliminates large DC-blocking capacitors by producing a ground-referenced output from a single supply.
• Ground sense feature minimizes headphone amplifier crosstalk and reduces ground-loop noise when used as a line out connection.
• Wake-on-beep function activates the amplifiers upon detection of a qualified beep signal at the BEEP input.
• Industry-leading click-and-pop suppression eliminates audible transients during power-up and shutdown cycles.

Audio Amplifiers Applications

• Notebook Computers
• Tablet PCs
• Portable Multimedia Players

Audio Amplifiers Procurement Notes

Verify the specific ordering suffix 'B' indicates the 3.3V LDO option, distinct from other variants like 'A' (4.75V) or 'C' (1.8V). Confirm package type matches the 28-pin TQFN-EP specification. Ensure compliance with RoHS standards if required for the target assembly process. Cross-reference the exact part number against the manufacturer's current product status to confirm availability.

Audio Amplifiers Selection Notes

Select this component when a single-supply audio solution is required for portable devices needing both speaker and headphone outputs. The integrated 3.3V LDO simplifies power management by providing a dedicated rail for internal circuitry. The DirectDrive technology reduces external component count and board space compared to traditional capacitor-coupled designs. Verify that the system meets the extended temperature range requirements of -40°C to +85°C.

Audio Amplifiers Part Context

This device belongs to the MAX9791/MAX9792 family of Windows Vista-compliant audio amplifiers. It integrates a Class D speaker amplifier, a DirectDrive headphone amplifier, and an LDO regulator into a single compact package. The family is designed for portable multimedia applications requiring high efficiency and low distortion.

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 reducing ground-loop noise.

Can the speaker and headphone amplifiers be controlled independently?

Yes, separate SPKR_EN and HP_EN control inputs provide independent shutdown of the speaker and headphone amplifiers.