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General Description

The MAX4411 fixed-gain, stereo headphone amplifier is designed for portable equipment where board space is at a premium. The MAX4411 uses a unique, patented DirectDrive architecture to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. Additionally, the gain of the amplifier is set internally (-1.5V/V, MAX4411 and -2V/V, MAX4411B), further reducing component count.

Features

♦ No Bulky DC-Blocking Capacitors Required

♦ Fixed -1.5V/V Gain Eliminates External Feedback Network

    MAX4411: -1.5V/V

    MAX4411B: -2V/V

♦ Ground-Referenced Outputs Eliminate DC-Bias Voltages on Headphone Ground Pin

♦ No Degradation of Low-Frequency Response Due to Output Capacitors

♦ 80mW per Channel into 16Ω

♦ Low 0.003 THD+N

♦ High PSRR (86dB at 217Hz)

♦ Integrated Click-and-Pop Suppression

♦ 1.8V to 3.6V Single-Supply Operation

♦ Low Quiescent Current (5mA)

♦ Independent Left/Right, Low-Power Shutdown Controls

♦ Short-Circuit and Thermal-Overload Protection

♦ ±8kV ESD-Protected Amplifier Outputs

♦ Available in Space-Saving Packages

    16-Bump UCSP (2mm ✕ 2mm ✕ 0.6mm)

    20-Pin Thin QFN (4mm ✕ 4mm ✕ 0.8mm)

Applications

    Notebook PCs

    Cellular Phones

    PDAs

    MP3 Players

    Smart Phones

    Portable Audio Equipment