3.3W Mono Class DG Multilevel Audio Amplifier

Delivers the Industry's Highest Output Power, Highest Efficiency, and Smallest Speaker Amplifier Solutions from a Single Li+ Battery

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The MAX98307/MAX98308 fully differential mono Class DG multilevel power amplifiers with integrated inverting charge pumps offer highly efficient, high-power audio solutions for portable applications.

Class DG multilevel modulation extends the dynamic range of the output signal by employing a charge-pump-generated negative rail as needed to extend the supply voltage. This scheme results in high efficiency over a wide output power range.

The ICs combine Maxim's active emissions limiting edge rate and overshoot control circuitry with multilevel output modulation to greatly reduce EMI. These features eliminate the need for output filtering as compared to traditional Class D devices, reducing component count and cost.

The MAX98307's 16-pin TQFN package features an adjustable gain set by external resistors. The MAX98308's space-saving 12-bump WLP package features an internally fixed gain of 8.5dB, 11.5dB, 14.5dB, 17.5dB, and 20.5dB set by a single gain input. Both devices operate over the extended -40°C to +85°C temperature range.
MAX98307, MAX98308: Simplified Block Diagrams MAX98307, MAX98308: Simplified Block Diagrams Enlarge+

Key Features

  • High Efficiency Combined with High Output Power
    • Class DG Multilevel Modulation Ensures Maximum Efficiency Over Wide Output Power Range
  • Improves Battery Life
    • Low 1.85mA Quiescent Current
  • High Output Power at 1% THD+N
    • 1.54W at VPVDD = 3.6V, 8Ω + 68µH Load
    • 2.85W at VPVDD = 5V, 8Ω + 68µH Load
  • High Output Power at 10% THD+N
    • 1.77W at VPVDD = 3.6V, 8Ω + 68µH Load
    • 3.3W at VPVDD = 5V, 8Ω + 68µH Load
  • 84% Efficiency (VPVDD = 3.6V, at 500mW Output)
  • Active Emissions Limiting and Class DG Multilevel Output Modulation Eliminates EMI Output Filtering Requirement
  • Integrated Charge Pump and High Efficiency Results in Small Solution Size
  • Excellent RF Immunity
  • Click-and-Pop Suppression
  • Thermal and Overcurrent Protection
  • Low-Current Shutdown Mode


  • Cellular Phones
  • Notebook Computers
  • Portable Audio
  • Smartphones
  • Tablet PCs
  • VoIP Phones
Part NumberClassSpkr. Amp. VCC
Spkr. Amp. VCC
Spkr. Amp. ICC
POUT into 8Ω @ 1% THD+N
POUT into 8Ω @ 10% THD+N
Spkr. Amp. Half Pwr. THD+N
minmaxtypminminA- WeightedminSee Notes
$0.62 @1k
MAX98308 2.72.13-
$1.05 @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.

MAX98307EVKIT: Evaluation Kit for the MAX98307

Technical Documents

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

Quality and Environmental Data

Product Reliability Reports: MAX98308.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX98308

CAD Symbols and Footprints

  • MAX98308EWC+
  • MAX98308EWC+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    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.

    Quality Management System >
    Environmental Management System >


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