MAX9725EEBC+

Overview

The MAX9725EEBC+ 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, and integrated click-and-pop suppression. It includes a low-power shutdown mode reducing current to 0.6µA and short-circuit protection.

Feature Summary

• DirectDrive architecture eliminates the need for large DC-blocking output capacitors by generating a negative internal supply via an inverting charge pump.
• Integrated comprehensive click-and-pop suppression circuitry prevents audible transients during startup and shutdown transitions.
• Low-power shutdown control significantly reduces supply current consumption when the device is disabled.
• Built-in short-circuit protection safeguards the amplifier against output faults.

Applications

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

Procurement Notes

Verify the specific suffix 'EEBC+' corresponds to the required package type (UCSP or QFN) and lead-free compliance status. Confirm that the fixed gain variant matches the system design requirements, as other model variants offer different fixed gains or adjustable configurations. Ensure the component meets RoHS standards if applicable to the target market regulations.

Selection Notes

Select this component for applications requiring minimal board space due to the elimination of bulky output coupling capacitors. Consider the fixed gain characteristics suitable for standard portable audio interfaces. Evaluate the single-cell battery operation capability for extended runtime in mobile devices. Verify thermal dissipation limits within the chosen package configuration for the expected ambient operating conditions.

Part Context

The MAX9725 belongs to Maxim Integrated's DirectDrive family of stereo headphone amplifiers designed for space-constrained portable electronics. This series emphasizes high efficiency and audio fidelity by removing external passive components typically required for biasing. The EEBC+ designation indicates a specific pin-compatible package option within the broader MAX9725 product line.

Replacement Considerations

Consult official documentation for direct pin-compatible substitutes within the MAX9725 series, such as variants with different fixed gains (e.g., MAX9725AEBC+, MAX9725BEBC+) or adjustable gain options (MAX9725EEBC). Ensure any replacement maintains the same package footprint and electrical specifications regarding supply voltage and output power.

FAQ

How does the DirectDrive architecture benefit the design?

It generates a ground-referenced output using an internal charge pump, eliminating the need for large DC-blocking capacitors, which saves board space and improves low-frequency response.

What is the purpose 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 approximately 0.6µA.

Does the device include protection against output shorts?

Yes, the MAX9725 includes built-in short-circuit protection to safeguard the amplifier during fault conditions.