Boosted 2.2W Class D Amplifier with Automatic Level Control

Delivers Constant 2.2W Output Power Without Collapsing Battery

Please check latest availability status for a specific part variant.


The MAX98502 is a high-efficiency, Class D audio amplifier that features an integrated boost converter to deliver a constant output power over a wide range of battery supply voltages.

The boost converter operates at 2MHz, requiring only a small (2.2µH) external inductor and capacitor.

The automatic level control has a battery tracking function that reduces the output swing as the supply voltage drops, preventing collapse of battery voltage.

The amplifier has differential inputs and an internal fully differential design. The MAX98502 also features three gain settings (6dB, 15.5dB, and 20dB) that are selectable with a logic input.

The MAX98502 is available in a small, 0.5mm pitch 16-bump WLP package (2.1mm x 2.1mm). It is specified over the extended -40°C to +85°C temperature range.
MAX98502: Simplified Block Diagram MAX98502: Simplified Block Diagram Enlarge+

Key Features

  • Boosted Class D Output
  • Integrated Automatic Level Control
  • Output Power
    • 2.2W into 8Ω, 10% THD+N
    • 1.7W into 8Ω, 1% THD+N
    • 4.1W into 4Ω, 10% THD+N
    • 3.4W into 4Ω, 1% THD+N
  • Wide 2.5V to 5.5V Supply Voltage Range
  • Undervoltage Lockout Protection
  • High Total Efficiency of 87%
  • High Step-Up Switching Frequency (2MHz)
  • Active Emission Limiting for Low EMI


  • Active Speaker Accessories
  • Cell Phones
  • GPS Devices
  • Mobile Internet Devices
  • Smartphones
Part NumberClassSpkr. 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
minmaxtypminminminminA- WeightedminSee Notes
MAX98502 D2.
$0.71 @1k
See All Speaker Amplifiers (33)
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.

MAX98502EVKIT: Evaluation Kit for the MAX98502

Technical Documents

App Note 5792 Multiplex Boosted Class-D without Additional External Circuitry

Quality and Environmental Data

Product Reliability Reports: MAX98502.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX98502EWE+
  • MAX98502EWE+T
  • MAX98502EWE+TW
  • MAX98502EWE+W
  • 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.

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    Environmental Management System >


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