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MAX1968EUI Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1968EUI Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 16 page  MAX1968/MAX1969 Power Drivers for Peltier TEC Modules EVALUATION KIT AVAILABLE General Description The MAX1968/MAX1969 are highly integrated and cost- effective, high-efficiency, switch-mode drivers for Peltier thermoelectric cooler (TEC) modules. Both devices utilize direct current control to eliminate current surges in the TEC. On-chip FETs minimize external components while providing high efficiency. A 500kHz/1MHz switch- ing frequency and a unique ripple cancellation scheme reduce component size and noise. The MAX1968 operates from a single supply and pro- vides bipolar ±3A output by biasing the TEC between the outputs of two synchronous buck regulators. Bipolar operation allows for temperature control without “dead zones” or other nonlinearities at low load currents. 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. The MAX1969 provides unipolar output up to 6A. Reliability is optimized with settable limits for both TEC voltage and current, with indepen- dently set limits for heating and cooling current. An analog output also monitors TEC current. The MAX1968/MAX1969 are available in a low-profile 28-pin TSSOP-EP package and is specified over the -40 °C to +85°C temperature range. The thermally enhanced TSSOP-EP package with exposed metal pad minimizes operating junction temperature. An evalua- tion kit is available to speed designs. Applications Fiber Optic Laser Modules WDM, DWDM Laser Diode Temperature Control Fiber Optic Network Equipment EDFA Optical Amplifiers Telecom Fiber Interfaces ATE Biotech Lab Equipment Benefits and Features • High Accuracy and Adjustability Improves System Performance by Optimizing TEC Operation • Direct Current Control Prevents TEC Current Surges • Ripple Cancellation for Low Noise • No Dead-Zone or Hunting at Low-Output Current • 1% Accurate Voltage Reference • Adjustable TEC Voltage Limit • Separately Adjustable Heating and Cooling Current Limits • ITEC Output Provides Proportional Voltage to TEC Current for Monitoring • High-Efficiency Switch-Mode Design • On-Chip Power MOSFETs Improve Efficiency While Reducing External Components • 500kHz/1MHz Switching Frequency • Choose from ±3A Output Current (MAX1968) or 6A Output Current (MAX1969) • Thermally Enhanced TSSOP-EP Package Minimizes Operating Junction Temperature Ordering Information PART TEMP RANGE PIN-PACKAGE MAX1968EUI -40°C to +85°C 28 TSSOP-EP* MAX1969EUI -40°C to +85°C 28 TSSOP-EP* Typical Operating Circuit PGND1 PGND2 CTLI COMP LX2 LX1 GND VDD MAX1968 PVDD1PVDD2 OS1 CS OS2 TEC 3V TO 5.5V TEC CURRENT- CONTROL SIGNAL Pin Configuration and Functional Diagram appear at end of data sheet. * EP = Exposed pad. 19-2447; Rev 3; 5/15 |
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