Home > Pending > MAX98400: Class D amplifiers integrate anticlipping and voltage limiting to ensure robust product designs

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MAX98400: Class D amplifiers integrate anticlipping and voltage limiting to ensure robust product designs

3rd August 2010

Maxim Integrated

ES Admin

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Maxim introduced the MAX98400, a family of filterless Class D amplifiers available in 2 x 12W, 2 x 20W, and 1 x 40W configurations. Anticlipping circuitry avoids clipping by automatically reducing the amplifier's gain when the supply voltage in insufficient to deliver the desired output voltage. Voltage limiting prevents damage when the supply voltage outputs more power than the speaker can handle. A pin-selectable mono/stereo mode changes the MAX98400A from a stereo 20W to mono 40W amplifier, while the MAX98400B is a stereo 12W amplifier. The combination of low EMI and integrated protection features makes the MAX98400 amplifiers ideal for TVs, notebooks, and all-in-one desktop applications.

The MAX98400 devices also feature thermal foldback to prevent unwanted thermal-shutdown events. Thermal foldback reduces the output signal when the internal junction temperature exceeds +120 degrees Celsius. This keeps the IC safe, while avoiding thermal-shutdown cycling, which would otherwise appear as a system malfunction to the end customer. Additionally, this amplifier family features short-circuit and thermal-overload protection, comprehensive click-and-pop suppression, and shutdown control.

The MAX98400 amplifiers are fully specified over the -40 degrees Celsius to +85 degrees Celsius extended temperature range. The MAX98400A is packaged in a small, 6mm x 6mm, lead-free, 36-pin TQFN and the MAX98400B in a 4mm x 4mm, 24-pin TQFN. Prices start at $1.20 for the MAX98400A and $0.95 for the MAX98400B (1000-up, FOB USA).