MAX9725BETC+T

Audio Amplifiers Overview

The MAX9725BETC+T is a fixed-gain, stereo headphone amplifier from the DirectDrive family. It operates on a single 0.9V to 1.8V supply and delivers up to 20mW per channel into a 32Ω load. The device features a fixed voltage gain of -1.5V/V, achieving 0.006% THD+N at 1kHz. It includes an inverting charge pump for ground-referenced outputs, ±8kV ESD protection, and low-power shutdown mode reducing current to 0.6µA.

Audio Amplifiers Feature Summary

• DirectDrive architecture eliminates DC-blocking output capacitors by generating an internal negative supply via an inverting charge pump.
• Fixed -1.5V/V gain configuration removes the need for external feedback resistors.
• Integrated click-and-pop suppression circuitry prevents audible transients during power-up and shutdown.
• Low quiescent current consumption with dedicated shutdown control for extended battery life.

Audio Amplifiers Applications

• MP3 Players
• Cellular Phones
• PDAs
• Smart Phones
• Portable Audio Equipment

Audio Amplifiers Procurement Notes

Verify the specific suffix 'T' indicates tape and reel packaging when sourcing. Confirm the '+T' designation aligns with lead-free/RoHS compliance requirements for your assembly process. Ensure the 12-pin thin QFN package dimensions match your PCB footprint constraints before finalizing procurement.

Audio Amplifiers Selection Notes

Select this model specifically for its fixed -1.5V/V gain setting, which simplifies the design by removing external feedback networks. It is suitable for applications requiring direct operation from a single AA or AAA battery without additional linear regulators due to high PSRR. Consider the 12-pin thin QFN package for space-constrained portable designs.

Audio Amplifiers Part Context

This component belongs to the MAX9725 series of 1V, low-power, DirectDrive stereo headphone amplifiers. The series includes variants with different fixed gains (MAX9725A, C, D) and an adjustable gain version (MAX9725E). All share the same core DirectDrive technology and package options.

Audio Amplifiers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing board layouts if considering alternative packages within the same series.

Audio Amplifiers FAQ

How does the DirectDrive architecture benefit the audio performance?

It generates a ground-referenced output using an internal charge pump, eliminating large DC-blocking capacitors that can attenuate low frequencies and introduce distortion.

What is the function of the SHDN pin?

The SHDN pin controls the low-power shutdown mode. Driving it low disables the amplifiers and charge pump, reducing supply current to 0.6µA typical.