MAX98400B:Stereo, High-Power, Class D Amplifier

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

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.

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
MAX98400A, MAX98400B: Simplified Block Diagram
MAX98400A, MAX98400B: Simplified Block Diagram
Applications/Uses
  • LCD Monitors
  • LCD/PDP Televisions
  • MP3 Docking Stations
  • Notebook PCs
DataSheet
titleDownload file
MAX98400A-MAX98400B Data SheetMAX98400A-MAX98400B.pdf
Parametrics
Part NumberClassSpkr. Amp. VCC
(V)
Spkr. Amp. VCC
(V)
Spkr. Amp. ICC
(mA)
POUT into 4Ω @ 1% THD+N
(W)
POUT into 4Ω @ 10% THD+N
(W)
POUT into 8Ω @ 1% THD+N
(W)
POUT into 8Ω @ 10% THD+N
(W)
Spkr. Amp. Half Pwr. THD+N
(%)
SNR
(dB)
PSRR
(dB)
Package/PinsBudgetary
Price
minmaxtypminminminminA- WeightedminSee Notes
MAX98400AD82810131716-0.0310767TQFN/36$1.28 @1k
MAX98400B--13.515101TQFN/24$1.02 @1k
Design kits & evaluation modules
Quality and Environmental Data
Related Products
  • MAX9737:Mono 7W Class D Amplifier
  • MAX9744:20W Stereo Class D Speaker Amplifier with Volume Control
  • MAX9736:Mono/Stereo High-Power Class D Amplifier
  • MAX9768:10W Mono Class D Speaker Amplifier with Volume Control
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX98400BETG+ActiveTQFN,;24 pin;16.8 mm²-40°C to +85°CLead Free
MAX98400BETG+TActiveTQFN,;24 pin;16.8 mm²-40°C to +85°CLead Free
MAX98400A-MAX98400B.pdf MAX98400B
MAX98400B.pdf MAX98400B
MAX98400A-MAX98400B.pdf MAX98400B