MAX9722A, MAX9722B

5V, Differential Input, DirectDrive, 130mW Stereo Headphone Amplifiers with Shutdown

Next-Generation DirectDrive Headphone Amplifiers Offer Differential Inputs and 5V Operation

Please check latest availability status for a specific part variant.


The MAX9722A/MAX9722B stereo headphone amplifiers are designed for portable equipment where board space is at a premium. The MAX9722A/MAX9722B use a unique DirectDrive® architecture to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, which saves cost, board space, and component height. Additionally, the gain of the amplifier is set internally (-2V/V, MAX9722B) or adjusted externally (MAX9722A). The MAX9722A/MAX9722B deliver up to 70mW per channel into a 16Ω load or 130mW into a 32Ω load and have low 0.009% THD+N. An 80dB at 217Hz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. The MAX9722A/MAX9722B include ±8kV ESD protection on the headphone outputs. Comprehensive anticlick-and-pop circuitry suppresses audible clicks and pops on startup and shutdown. A low-power shutdown mode reduces the supply current to 0.1µA.

The MAX9722A/MAX9722B operate from a single 2.4V to 5.5V supply, consume only 5.5mA of supply current, feature short-circuit and thermal-overload protection, and are specified over the extended -40°C to +85°C temperature range. The devices are available in tiny 16-pin thin QFN (3mm x 3mm x 0.8mm) and 16-pin TSSOP packages.
MAX9722: Typical Application Circuit MAX9722: Typical Application Circuit Enlarge+

Key Features

  • 2.4V to 5.5V Single-Supply Operation
  • High PSRR (80dB at 217Hz) Eliminates LDO
  • No Bulky DC-Blocking Capacitors Required
  • Ground-Referenced Outputs Eliminate DC Bias Voltage on Headphone Ground Pin
  • No Degradation of Low-Frequency Response Due to Output Capacitors
  • Differential Inputs for Enhanced Noise Cancellation
  • Adjustable Gain (MAX9722A) or Fixed -2V/V Gain (MAX9722B)
  • 130mW per Channel into 32Ω
  • Low 0.009% THD+N
  • Integrated Click-and-Pop Suppression
  • Low Quiescent Current (5.5mA)
  • Short-Circuit and Thermal-Overload Protection
  • ±8kV ESD-Protected Amplifier Outputs (Human Body Model)
  • Available in a Space-Saving 16-Pin Thin QFN (3mm x 3mm x 0.8mm) Package


  • Cell Phones
  • Flat-Panel Monitors
  • MP3 Players
  • Notebook and Desktop PCs
  • PDAs
  • Portable Audio Equipment
  • Smartphones

MAX9722AEVKIT: Evaluation Kit for the MAX9722A and MAX9722B
Request Reliability Report for: MAX9722A  MAX9722B 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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Related Resources

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