The MAX4411 is a fixed-gain, stereo headphone amplifier from MAXIM that 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. The MAX4411 delivers up to 80mW per channel into a 16Ω load and has low 0.003% THD+N. An 86dB at 217Hz power-supply rejection ratio (PSRR) allows this device to operate from noisy digital supplies without an additional linear regulator. The MAX4411 includes ±8kV ESD protection on the headphone outputs. Com- prehensive click-and-pop circuitry suppresses audible clicks and pops on startup and shutdown. Independent left/right, low-power shutdown controls make it possible to optimize power savings in mixed-mode, mono/stereo applications. The MAX4411 operates from a single 1.8V to 3.6V supply, consumes only 5mA of supply current, has short-circuit and thermal-overload protection, and is specified over the extended -40°C to +85°C temperature range. The MAX4411 is available in a tiny (2mm ✕ 2mm ✕ 0.6mm), 16-bump chip-scale package (UCSP™) and a 20-pin thin QFN package (4mm ✕ 4mm ✕ 0.8mm).
The MAX4411 is a fixed‑gain, stereo headphone amplifier designed for portable equipment where board space is at a premium. It uses a patented DirectDrive architecture to deliver a ground‑referenced output from a single supply, eliminating bulky DC‑blocking capacitors and reducing component count.
The device operates from a 1.8 V to 3.6 V single supply, delivers up to 80 mW per channel into 16 Ω, and includes features such as click‑and‑pop suppression, independent low‑power shutdown controls, short‑circuit and thermal‑overload protection, and +8 kV ESD‑protected outputs. It is offered in space‑saving 2‑mm UCSP and 4‑mm thin QFN packages.
| Output Power (per channel) | 80 mW into 16 Ω |
|---|---|
| THD+N | 0.003 % |
| Power‑Supply Rejection Ratio (PSRR) | 86 dB at 217 Hz |
| Gain (MAX4411) | -1.5 V/V |
| ESD Protection | +8 kV on headphone outputs |
Each channel can deliver up to 80 mW into a 16 Ω load.
The amplifier achieves a total harmonic distortion plus noise of 0.003 %.