MAX9725AEBC+

Audio Amplifiers Overview

The MAX9725AEBC+ is a fixed-gain, stereo headphone amplifier utilizing DirectDrive architecture to eliminate DC-blocking capacitors. It operates from 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, ±8kV ESD protection on outputs, integrated click-and-pop suppression, and a low-power shutdown mode reducing current to 0.6µA. It includes short-circuit protection and maintains high PSRR of 80dB at 1kHz.

Audio Amplifiers Feature Summary

• DirectDrive architecture eliminates the need for large output DC-blocking capacitors by generating a negative internal supply via an inverting charge pump.
• Fixed voltage gain of -2V/V reduces external component count compared to adjustable variants.
• Integrated comprehensive click-and-pop suppression circuitry prevents audible transients during power-up and shutdown.
• Low quiescent current consumption of 2.1mA supports extended battery life in portable applications.

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 and tape-and-reel packaging. Confirm the package type matches the 12-bump UCSP footprint (1.54mm x 2.02mm x 0.6mm). Ensure the fixed gain variant (-2V/V) aligns with the system design requirements rather than the adjustable MAX9725E.

Audio Amplifiers Selection Notes

Select this part when board space is limited and capacitor elimination is required. The fixed -2V/V gain suits designs not needing external feedback networks. Consider the 12-bump UCSP package for minimal height constraints. Verify input coupling capacitor selection to maintain low-frequency response given the internal 25kΩ input resistance.

Audio Amplifiers Part Context

The MAX9725 series includes fixed-gain variants (A-D) and an adjustable gain variant (E). The MAX9725AEBC+ specifically denotes the -2V/V gain version in the 12-bump UCSP package. Other packages include the 12-pin Thin QFN. All variants share the same core DirectDrive functionality and electrical characteristics.

Audio Amplifiers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

Audio Amplifiers FAQ

How does the DirectDrive architecture affect low-frequency response?

By eliminating large DC-blocking capacitors, the DirectDrive architecture removes the high-pass filter effect that typically attenuates low frequencies, thereby improving low-frequency response and reducing distortion caused by capacitor voltage coefficients.

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. Driving it high returns the device to full operation.