Mono 3.2W Class D Amplifier

Industry's Smallest Class D Amplifier! 1mm x 1mm!


The MAX98304 mono 3.2W Class D amplifier provides Class AB audio performance with Class D efficiency. This device offers five selectable gain settings (0dB, 3dB, 6dB, 9dB, and 12dB) set by a single gain-select input (GAIN).

Active emissions-limiting, edge-rate, and overshoot control circuitry greatly reduces EMI. A filterless spread-spectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices. These features reduce application component count.

The IC's 0.95mA at 3.7V (1.2mA at 5V) quiescent current extends battery life in portable applications.

The IC is available in a 9-bump (1.0mm x 1.0mm) WLP with 0.3mm pitch that is specified over the extended -40°C to +85°C temperature range.
MAX98304: Typical Application Circuit MAX98304: Typical Application Circuit Enlarge+

Key Features

  • Low Quiescent Current: 0.95mA at 3.7V
  • Spread Spectrum and Active Emissions Limiting
  • Five Pin-Selectable Gains
  • 19µVRMS Ultra-Low Noise
  • 90dB PSRR
  • Click-and-Pop Suppression
  • Thermal and Overcurrent Protection
  • Low-Current Shutdown Mode
  • 1.0mm x 1.0mm, 9-Bump WLP (0.3mm Pitch) Space-Saving Package


  • Cellular Phones
  • MP3 Players
  • Notebook and Netbook Computers
  • Portable Audio Players
  • Tablets
  • VoIP Phones
Part Number Class Spkr. Amp. VCC
Spkr. Amp. VCC
Spkr. Amp. ICC
POUT into 4Ω @ 1% THD+N
POUT into 4Ω @ 10% THD+N
POUT into 8Ω @ 1% THD+N
POUT into 8Ω @ 10% THD+N
Spkr. Amp. Half Pwr. THD+N
min max typ min min min min A- Weighted min See Notes
MAX98304  D 2.5 5.5 0.95 2.6 3.2 1.4 1.8 0.03 99.6 90 $0.42 @1k
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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.

MAX98304EVKIT: Evaluation Kit for the MAX98304

Technical Documents

Tutorial 5590 How to Select the Best Audio Amplifier for Your Design

Quality and Environmental Data

Product Reliability Reports: MAX98304.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX98304

Related Resources