60mW, DirectDrive, Stereo Headphone Amplifier with Low RF Susceptibility and Shutdown

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The MAX9724A/MAX9724B stereo headphone amplifiers are designed for portable equipment where board space is at a premium. These devices use 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. The MAX9724 suppresses RF radiation received by input and supply traces acting as antennas and prevents the amplifier from demodulating the coupled noise. The MAX9724A offers an externally adjustable gain while the MAX9724B has an internally preset gain of -1.5V/V. The MAX9724A/MAX9724B deliver up to 60mW per channel into a 32Ω load and have low 0.02% THD+N. An 80dB at 1kHz power-supply rejection ratio (PSRR) allows these devices to operate from noisy digital supplies without an additional linear regulator. Comprehensive click-and-pop circuitry suppresses audible clicks and pops on startup and shutdown.

The MAX9724A/MAX9724B operate from a single 2.7V to 5.5V supply, consume only 3.5mA 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 12-bump UCSP™ (1.5mm x 2mm) and 12-pin thin QFN (3mm x 3mm x 0.8mm) packages.
MAX9724A, MAX9724B: Functional Diagram MAX9724A, MAX9724B: Functional Diagram Enlarge+

Key Features

  • Improved RF Noise Rejection (Up to 67dB Over Typical Amplifiers)
  • No Bulky DC-Blocking Capacitors Required
  • Low-Power Shutdown Mode, < 0.1µA
  • Adjustable Gain (MAX9724A) or Fixed -1.5V/V Gain (MAX9724B)
  • Low 0.02% THD+N
  • High PSRR (80dB at 1kHz) Eliminates LDO
  • Integrated Click-and-Pop Suppression
  • 2.7V to 5.5V Single-Supply Operation
  • Low Quiescent Current (3.5mA)
  • Available in Space-Saving Packages
    • 12-Bump UCSP (1.5mm x 2mm)
    • 12-Pin Thin QFN (3mm x 3mm x 0.8mm)


  • Cellular Phones
  • DVD Players
  • Handheld Gaming Consoles
  • MP3 Players
  • Notebook PCs
  • PDAs
  • Smartphones

MAX9724AEVKIT: Evaluation Kit for the MAX9724A and MAX9724B
Request Reliability Report for: MAX9724A 
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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  • Ultra-Low Noise Floor

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