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80mW, Fixed-Gain, DirectDrive, Stereo Headphone Amplifier with Shutdown

Unique Low-Cost Headphone Amplifier Eliminates DC-Blocking Capacitors and Gain-Setting Resistors

Product Details

Key Features

Simplified Block Diagram

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Key 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 x 2mm x 0.6mm)
    • 20-Pin Thin QFN (4mm x 4mm x 0.8mm)

Applications/Uses

  • Cell Phones
  • MP3 Players
  • Notebook Computers
  • PDAs
  • Portable Audio Equipment
  • Smartphones

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 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. Comprehensive 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 x 2mm x 0.6mm), 16-bump chip-scale package (UCSP™) and a 20-pin thin QFN package (4mm x 4mm x 0.8mm).

Simplified Block Diagram

MAX4411, MAX4411B: Typical Application Circuit MAX4411, MAX4411B: Typical Application Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .