The MAX1968EUI+ is a highly integrated and high-efficiency, Switch-mode Driver 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 switching frequency and a unique ripple cancellation scheme reduce component size and noise. The MAX1968EUI+ operates from a single supply and provides 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 analogue control signal precisely sets the TEC current.
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
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