MAX9722BETE+T

Audio Amplifiers Overview

The MAX9722BETE+T is a stereo headphone amplifier from the DirectDrive family, designed for portable equipment. It operates on a single 2.4V to 5.5V supply and delivers up to 130mW per channel into a 32Ω load or 70mW into a 16Ω load. The device features a fixed internal gain of -2V/V, differential inputs, and low 0.009% THD+N. It includes integrated click-and-pop suppression, ±8kV ESD protection, short-circuit and thermal-overload protection, and a low-power shutdown mode reducing current to 0.1µA.

Audio Amplifiers Feature Summary

• DirectDrive architecture eliminates bulky DC-blocking capacitors by generating ground-referenced outputs via an internal charge pump.
• Fixed -2V/V gain configuration simplifies external component requirements compared to adjustable variants.
• Integrated click-and-pop suppression circuitry prevents audible transients during power-up and shutdown sequences.
• High power-supply rejection ratio allows operation from noisy digital supplies without additional linear regulators.

Audio Amplifiers Applications

• Notebook and desktop PCs
• MP3 players and portable audio equipment
• Flat-panel monitors
• Cellular phones and smart phones

Audio Amplifiers Procurement Notes

Verify the specific suffix 'E' corresponds to the 16-pin Thin QFN package (3mm x 3mm x 0.8mm) with exposed paddle. Confirm the 'B' variant designation indicates the fixed -2V/V gain setting rather than the adjustable MAX9722A. Ensure RoHS compliance documentation matches the '+T' tape-and-reel packaging format required for automated assembly processes.

Audio Amplifiers Selection Notes

Select this component when board space is limited and large output coupling capacitors must be avoided. Choose the MAX9722B over the MAX9722A if a fixed -2V/V gain is sufficient, as it removes the need for external feedback resistors. Consider the TSSOP package alternative only if QFN soldering capabilities are unavailable, noting the difference in thermal dissipation characteristics between the two form factors.

Audio Amplifiers Part Context

This part belongs to the MAX9722 series of high-performance stereo headphone amplifiers. It shares the core DirectDrive technology and protection features with the MAX9722A but differs in its fixed gain configuration. The series is optimized for battery-powered devices requiring high audio fidelity within a minimal footprint.

Audio Amplifiers Replacement Considerations

MAX9722AEUE+T offers the same functionality in a 16-pin TSSOP package instead of the QFN form factor.

Audio Amplifiers FAQ

How does the DirectDrive architecture affect low-frequency response?

By eliminating DC-blocking capacitors, the DirectDrive architecture prevents the high-pass filtering effect that typically attenuates low frequencies, thereby preserving bass response and reducing distortion associated with capacitor voltage coefficients.

What is the function of the exposed paddle on the QFN package?

The exposed paddle serves as a thermal pad to dissipate heat and can be connected to PVSS or an electrically isolated copper plane; it must not be connected to PGND, SGND, PVDD, or SVDD.