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MAX8520：Smallest TEC Power Drivers for Optical Modules

Industry's Smallest TEC Drivers for SFF/SFP Modules Reduce Heat Generation by 50%

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.

Key Features 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)

MAX8520, MAX8521: Typical Operating Circuit Applications/Uses Automated Test Equipment (ATE) Biotech Lab Equipment Fiber Optic Network Equipment Fiber-Optic Laser Modules SFF/SFP Modules

DataSheet

Parametrics

Design kits & evaluation modules

• MAX8521EVKIT

Quality and Environmental Data

• MAX8520.pdf

Ordering Information