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MAX1978 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1978 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 20 page General Description 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-can- cellation scheme optimize component size and efficiency while reducing noise. Switching speeds of internal MOSFETs are optimized to reduce noise and EMI. An ultra- low-drift chopper amplifier maintains ±0.001°C temperature stability. Output current, rather than voltage, is directly con- trolled to eliminate current surges. Individual heating and cooling current and voltage limits provide the highest level of TEC protection. The MAX1978 operates from a single supply and provides bipolar ±3A output by biasing the TEC between the outputs of two synchronous buck regulators. True bipolar operation controls temperature without “dead zones” or other nonlin- earities at low load currents. The control system does not hunt when the set point is very close to the natural operating point, where only a small amount of heating or cooling is needed. An analog control signal precisely sets the TEC current. The MAX1979 provides unipolar output up to 6A. A chopper-stabilized instrumentation amplifier and a high- precision integrator amplifier are supplied to create a pro- portional-integral (PI) or proportional-integral-derivative (PID) controller. The instrumentation amplifier can interface to an external NTC or PTC thermistor, thermocouple, or semicon- ductor temperature sensor. Analog outputs are provided to monitor TEC temperature and current. In addition, separate overtemperature and undertemperature outputs indicate when the TEC temperature is out of range. An on-chip volt- age reference provides bias for a thermistor bridge. The MAX1978/MAX1979 are available in a low-profile 48-lead thin QFN-EP package and is specified over the -40°C to +85°C temperature range. The thermally enhanced QFN-EP package with exposed metal pad minimizes operating junction temperature. An evaluation 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 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 TEC Current Monitor o Temperature Monitor o Over- and Undertemperature Alarm o Bipolar ±3A Output Current (MAX1978) o Unipolar +6A Output Current (MAX1979) Integrated Temperature Controllers for Peltier Modules ________________________________________________________________ Maxim Integrated Products 1 Ordering Information FREQ N.C. LX1 PGND1 N.C. LX1 PVDD1 GND GND LX1 PVDD1 PGND1 PGND2 LX2 PGND2 LX2 PVDD2 N.C. LX2 N.C. OS2 1 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 TQFN-EP MAX1978 MAX1979 TOP VIEW *ELECTRICALLY CONNECTED TO THE UNDERSIDE METAL SLUG. NOTE: GND IS CONNECTED TO THE UNDERSIDE METAL SLUG. OT PVDD2 SHDN Pin Configuration 19-2490; Rev 2; 1/10 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Typical Operating Circuit appears at end of data sheet. PART TEMP RANGE PIN-PACKAGE MAX1978ETM -40 °C to +85°C 48 Thin QFN-EP* MAX1979ETM -40 °C to +85°C 48 Thin QFN-EP* * EP = Exposed pad. |
Similar Part No. - MAX1978_10 |
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Similar Description - MAX1978_10 |
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