Stereo, High-Power, Class D Amplifier

Differential Input, Power Limiting, Anticlipping, Thermal Foldback, and Excellent EMI Performance

Please check latest availability status for a specific part variant.


The MAX98400A/MAX98400B Class D amplifiers provide high-performance, thermally efficient amplifier solutions. The MAX98400A delivers 2x20W into 8Ω loads or 1x40W into a 4Ω load. The MAX98400B delivers 2x12W into 8Ω loads.

An integrated limiting circuit prevents output clipping distortion, protects small speakers from transient voltages, and reduces power dissipation.

A thermal-foldback feature can be enabled to automatically reduce the output power at above a junction temperature of +120°C. Traditional thermal protection is also available in addition to robust overcurrent protection.

The ICs operate from a single 8V to 28V supply and provide a high 67dB PSRR, eliminating the need for a regulated power supply. They offer up to 90% efficiency from a 12V supply.

Filterless modulation allows the ICs to pass EN55022B EMI limits with 1m cables using only a low-cost ferrite bead and small-value capacitor on each output.

Both devices feature eight-digitally-controlled gain settings.

Comprehensive click-and-pop reduction circuitry minimizes noise coming into and out of shutdown.

The MAX98400A/MAX98400B are available in 36-pin and 24-pin TQFN packages, respectively, and are specified over the -40°C to +85°C temperature range.
MAX98400A, MAX98400B: Simplified Block Diagram MAX98400A, MAX98400B: Simplified Block Diagram Enlarge+

Key Features

  • Wide 8V to 28V Supply Voltage Range
  • Single Supply Operation
  • Low EMI: Active Emissions Limiting
  • Clipping Limiter
  • Low Quiescent Current
  • Thermal Foldback
  • Thermal and Overcurrent Protection


  • LCD Monitors
  • LCD/PDP Televisions
  • MP3 Docking Stations
  • Notebook PCs

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX98400AEVKIT: Evaluation Kit for the MAX98400A
MAX98400BEVKIT: Evaluation Kit for the MAX98400B
Product Reliability Reports: MAX98400A.pdf 
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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