MAX1978

19-2490; Rev 0; 7/02 KIT ATION EVALU E L B A AVAIL Integrated Temperature Controllers for Peltier Modules General Description Features o Smallest, Safest, Most Accurate Complete Single-Chip Controller o On-Chip Power MOSFETS—No External FETs o Circuit Footprint < 0.93in2 o Circuit Height < 3mm o Temperature Stability to 0.001°C o Integrated Precision Integrator and Chopper Stabilized Op Amps o Accurate, Independent Heating and Cooling Current Limits o Eliminates Surges By Directly Controlling TEC Current o Adjustable Differential TEC Voltage Limit o Low-Ripple and Low-Noise Design o o o o TEC Current Monitor Temperature Monitor Over- and Undertemperature Alarm Bipolar ±3A Output Current (MAX1978) MAX1978/MAX1979 The MAX1978/MAX1979 are the smallest, safest, most accurate complete single-chip temperature controllers for Peltier thermoelectric cooler (TEC) modules. On-chip power FETs and thermal control-loop circuitry minimize external components while maintaining high efficiency. Selectable 500kHz/1MHz switching frequency and a unique ripple-cancellation scheme optimize component size and efficiency while reducing noise. Switching speeds of internal MOSFETs are optimized to reduce noise and EMI. An ultralow-drift chopper amplifier maintains ±0.001°C temperature stability. Output current, rather than voltage, is directly controlled to eliminate current surges. Individual heating and cooling current and voltage limits provide the highest level of TEC protection. The MAX1978 ...