MAX9728BETC+

Audio Amplifiers Overview

The MAX9728BETC+ is a stereo headphone amplifier in a 12-pin TQFN package. It operates from a single 4.5V to 5.5V supply and delivers up to 60mW per channel into a 32Ω load. The device features an internally preset gain of -1.5V/V, low quiescent current of 3.5mA, and shutdown current below 0.1µA. It includes integrated click-and-pop suppression, short-circuit protection, and thermal overload protection.

Audio Amplifiers Feature Summary

• DirectDrive architecture eliminates bulky DC-blocking capacitors by using a charge pump to create bipolar supplies from a single rail.
• Integrated comprehensive click-and-pop suppression circuitry prevents audible transients during startup and shutdown.
• Low-power shutdown mode reduces quiescent current consumption to less than 0.1µA for extended battery life.

Audio Amplifiers Applications

• Notebook PCs
• DVD Players
• LCD/PDP Displays

Audio Amplifiers Procurement Notes

Verify the specific ordering suffix ETCC against the manufacturer's official documentation to confirm the exact pin configuration and package dimensions. Confirm RoHS compliance status and lead-free material declarations with the authorized distributor or manufacturer representative prior to finalizing procurement specifications.

Audio Amplifiers Selection Notes

Select this component when board space is limited and external output coupling capacitors must be avoided. The fixed internal gain simplifies design compared to adjustable variants. Ensure the application requires a single 4.5V to 5.5V supply voltage range and benefits from the integrated thermal and short-circuit protections.

Audio Amplifiers Part Context

This part belongs to the MAX9728 family of DirectDrive stereo headphone amplifiers. It shares the same physical footprint and core functionality as the MAX9728A but differs in its gain setting. While the MAX9728A allows for externally adjustable gain via resistors, the MAX9728B utilizes an internally preset gain of -1.5V/V, reducing the need for external feedback components.

Audio Amplifiers Replacement Considerations

The MAX9728AETC+ serves as a functional substitute within the same package if external gain adjustment is required instead of the fixed internal gain.

Audio Amplifiers FAQ

How does the DirectDrive architecture benefit the MAX9728BETC+?

It uses a charge pump to generate a negative supply rail from a single positive source, allowing the outputs to be biased at signal ground. This removes the need for large DC-blocking capacitors, saving board space and cost.

What is the power consumption in shutdown mode?

When the SHDN pin is driven low, the device enters a low-power shutdown mode where the supply current drops to less than 0.1µA.