MAX9725DETC+

Overview

The MAX9725DETC+ is a fixed-gain, stereo headphone amplifier from the DirectDrive family. It operates on a single supply voltage ranging from 0.9V to 1.8V and delivers up to 20mW per channel into a 32Ω load. The device features a fixed voltage gain of -4V/V and includes an inverting charge pump to generate a negative supply rail. This architecture enables ground-referenced outputs, eliminating the need for large DC-blocking capacitors. It incorporates comprehensive click-and-pop suppression, low-power shutdown mode, and short-circuit protection.

Feature Summary

• DirectDrive architecture eliminates output DC-blocking capacitors by generating a ground-referenced output from a single supply using an internal inverting charge pump.
• Fixed voltage gain of -4V/V reduces external component count compared to adjustable gain variants.
• Integrated click-and-pop suppression circuitry minimizes audible transients during power-up and shutdown transitions.
• Low quiescent current consumption with a dedicated low-power shutdown mode that significantly reduces supply current.

Applications

• Portable audio equipment
• Cellular phones
• Smart phones

Procurement Notes

Verify the specific suffix 'ETC+' against the manufacturer's official ordering guide to confirm package type and lead-free status. Confirm availability as this product line may have discontinuation notices. Ensure the design supports the required 12-pin thin QFN footprint and exposed pad thermal management.

Selection Notes

Select the MAX9725DETC+ when a fixed high gain of -4V/V is required without external feedback resistors. Compare against MAX9725A/B/C variants if lower gain (-2V/V, -1.5V/V, or -1V/V) better matches the source impedance and desired output level. Verify that the 12-pin thin QFN package meets board space constraints.

Part Context

This component belongs to the MAX9725 series of 1V, low-power, DirectDrive stereo headphone amplifiers. The series includes variants with fixed gains (MAX9725A through D) and one with adjustable gain (MAX9725E). All share the same core DirectDrive technology and package options, differing primarily in internal gain-setting resistor values.

Replacement Considerations

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