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MAX8521EBX Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX8521EBX Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 19 page General Description The MAX8520/MAX8521 are designed to drive thermo- electric 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 and MAX8521 operate from a single supply and bias the TEC between the outputs of two synchro- nous buck regulators. This operation allows for temper- ature 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 thin QFN package and its switching frequency is adjustable up to 1MHz through an external resistor. The MAX8521 is also available in a 5mm x 5mm thin QFN, as well as a space- saving 3mm x 3mm UCSP™, with a pin-selectable switching frequency of 500kHz or 1MHz. Applications SFF/SFP Modules Fiber-Optic Laser Modules Fiber-Optic Network Equipment ATE Biotech Lab Equipment Features o Circuit Footprint of 0.31in2 o Low-Profile Design o On-Chip Power MOSFETs o High-Efficiency Switch-Mode Design o Ripple Cancellation for Low Noise o Direct Current Control Prevents TEC Current Surges o 5% Accurate Adjustable Heating/Cooling Current Limits o 2% Accurate TEC Voltage Limit o No Dead Zone or Hunting at Low Output Current o ITEC Monitors TEC Current o 1% Accurate Voltage Reference o Switching Frequency Up to 1MHz o Synchronization (MAX8521) Smallest TEC Power Drivers for Optical Modules ________________________________________________________________ Maxim Integrated Products 1 Ordering Information 19-2586; Rev 0; 10/02 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN-PACKAGE MAX8520ETP -40 °C to +85°C 20 Thin QFN 5mm x 5mm MAX8521EBX -40 °C to +85°C 36 UCSP 3mm x 3mm MAX8521ETP -40 °C to +85°C 20 Thin QFN 5mm x 5mm UCSP is a trademark of Maxim Integrated Products, Inc. INPUT 3V TO 5.5V VDD PVDD COMP GND SHDN ITEC ON OFF TEC CURRENT MONITOR CTLI LX1 PGND1 CS OS1 OS2 LX2 PGND2 TEC ITEC = ± 1.5A REF CURRENT- CONTROL SIGNAL FREQ ANALOG /DIGITAL TEMPERATURE CONTROL OUTPUT MAX8521 Typical Operating Circuit Pin Configurations appear at end of data sheet. 3mm x 3mm CSP 5mm x 5mm QFN |
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