1. Products
  2. Power Monitor, Control, and Protection
  3. Thermoelectric Cooler Controller
  4. MAX8521


Features and Benefits

  • Circuit Footprint of 0.31in²
  • Low-Profile Design
  • On-Chip Power MOSFETs
  • High-Efficiency Switch-Mode Design
  • Ripple Cancellation for Low Noise
  • Direct Current Control Prevents TEC Current Surges
  • 5% Accurate Adjustable Heating/Cooling Current Limits
  • 2% Accurate TEC Voltage Limit
  • No Dead Zone or Hunting at Low Output Current
  • ITEC Monitors TEC Current
  • 1% Accurate Voltage Reference
  • Switching Frequency Up to 1MHz
  • Synchronization (MAX8521)

Product Details

The MAX8520/MAX8521 are designed to drive thermoelectric coolers (TECs) in space-constrained optical modules. Both devices deliver ±1.5A output current and control the TEC current to eliminate harmful current surges. On-chip FETs minimize external components and high switching frequency reduces the size of external components.

The MAX8520/MAX8521 operate from a single supply and bias the TEC between the outputs of two synchronous buck regulators. This operation allows for temperature control without "dead zones" or other nonlinearities at low current. This arrangement ensures that the control system does not hunt when the set-point is very close to the natural operating point, requiring a small amount of heating or cooling. An analog control signal precisely sets the TEC current.

Both devices feature accurate, individually-adjustable heating current limit and cooling current limit along with maximum TEC voltage limit to improve the reliability of optical modules. An analog output signal monitors the TEC current. A unique ripple cancellation scheme helps reduce noise.

The MAX8520 is available in a 5mm x 5mm TQFN package and its switching frequency is adjustable up to 1MHz through an external resistor. The MAX8521 is also available in a 5mm x 5mm TQFN as well as space-saving 3mm x 3mm UCSP™ and 36-bump WLP (3mm x 3mm) packages, with a pin-selectable switching frequency of 500kHz or 1MHz.


  • Automated Test Equipment (ATE)
  • Biotech Lab Equipment
  • Fiber Optic Network Equipment
  • Fiber-Optic Laser Modules
  • SFF/SFP Modules

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

Software Development

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX8521ETP+ Material Declaration Reliability Data 20-LFCSP-5X5X0.75
MAX8521ETP+T Material Declaration Reliability Data 20-LFCSP-5X5X0.75
MAX8521EWX+ Material Declaration Reliability Data Wafer-Level Package 6x6 Bump, Depopulated
MAX8521EWX+T Material Declaration Reliability Data Wafer-Level Package 6x6 Bump, Depopulated
Wafer Fabrication Data MAX8521 Reliability Data

Sample & Buy

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Buy Now Pricing

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List Pricing

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Lead Times

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