MAX9725EEBC+TG45

Overview

The MAX9725EEBC+TG45 is a fixed-gain, stereo headphone amplifier from the DirectDrive series by Analog Devices/Maxim Integrated. 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. Key specifications include a quiescent current of 2.3mA, shutdown current of 0.6µA, and ±8kV ESD protection. It is housed in a 12-bump UCSP package.

Feature Summary

• DirectDrive architecture eliminates large DC-blocking output capacitors by generating a negative supply via an internal charge pump.
• Integrated click-and-pop suppression circuitry prevents audible transients during power-up and shutdown transitions.
• Low-power shutdown mode reduces supply current to typical 0.6µA when the SHDN pin is driven low.
• High power-supply rejection ratio allows operation directly from noisy digital supplies without additional linear regulators.

Applications

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

Procurement Notes

Verify the specific suffix +TG45 indicates lead-free/RoHS compliance as documented in the ordering information. Confirm the EEBC variant corresponds to the adjustable gain configuration requiring external input and feedback resistors. Ensure the UCSP package dimensions match the board layout constraints. Check for obsolescence status or lifecycle notices prior to final design approval.

Selection Notes

Select this component for applications requiring minimal board space due to the tiny UCSP package. Choose the MAX9725E variant specifically if adjustable gain settings are necessary, as other variants offer fixed gains. Ensure the system supply voltage remains within the 0.9V to 1.8V range to maintain optimal performance and avoid exceeding absolute maximum ratings.

Part Context

This part belongs to the MAX9725 family of 1V, low-power, DirectDrive stereo headphone amplifiers. The family includes variants with fixed gains (-2V/V, -1.5V/V, -1V/V, -4V/V) and the adjustable gain MAX9725E. All variants share the same core architecture, offering high PSRR and integrated protection features for portable audio systems.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult official manufacturer resources for potential cross-reference options or updated product line replacements.