MAX9725AEBC+T

Audio Amplifiers Overview

The MAX9725AEBC+T is a fixed-gain, stereo headphone amplifier from the DirectDrive series. It operates on a single 0.9V to 1.8V supply and delivers up to 20mW per channel into a 32Ω load with 0.006% THD+N. The device features an inverting charge pump for ground-referenced outputs, eliminating DC-blocking capacitors. It includes integrated click-and-pop suppression, short-circuit protection, and low-power shutdown mode (0.6µA). The unit is housed in a 12-bump UCSP package.

Audio Amplifiers Feature Summary

• DirectDrive architecture eliminates large output-coupling capacitors by generating a negative supply via an internal charge pump.
• Fixed voltage gain of -2V/V reduces external component count.
• Comprehensive click-and-pop suppression circuitry minimizes audible transients during power-up and shutdown.
• Low quiescent current consumption supports extended battery life in portable devices.

Audio Amplifiers Applications

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

Audio Amplifiers Procurement Notes

Verify the specific suffix +TG45 indicates lead-free/RoHS compliance as documented. Confirm the 12-bump UCSP package dimensions match board space constraints. Ensure input filtering components are selected to maintain low-frequency response without introducing distortion.

Audio Amplifiers Selection Notes

Select this model when a fixed -2V/V gain is required for stereo audio paths. Compare against MAX9725BEBC+T or MAX9725CEBC+T if different fixed gains are needed. Consider the MAX9725EEBC+T if adjustable gain flexibility is necessary for the design.

Audio Amplifiers Part Context

This component belongs to the MAX9725 family of 1V DirectDrive stereo headphone amplifiers. The 'A' designation specifically sets the internal feedback network for a -2V/V gain. Other variants include B (-1.5V/V), C (-1V/V), D (-4V/V), and E (adjustable).

Audio Amplifiers Replacement Considerations

MAX9725BEBC+T offers -1.5V/V gain. MAX9725CEBC+T provides -1V/V gain. MAX9725DEBC+T supplies -4V/V gain. MAX9725EEBC+T allows adjustable gain via external resistors.

Audio Amplifiers FAQ

How does the DirectDrive architecture benefit the design?

It generates a negative supply internally to bias outputs at ground, removing the need for bulky DC-blocking capacitors and improving low-frequency response.

What is the purpose of the SHDN pin?

Driving the SHDN pin low disables the amplifiers and charge pump, reducing supply current to approximately 0.6µA for low-power standby modes.