MAX1978

Integrated Temperature Controllers for Peltier Modules


Please check latest availability status for a specific part variant.

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-cancellation 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 controlled 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 nonlinearities 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 proportional-integral (PI) or proportional-integral-derivative (PID) controller. The instrumentation amplifier can interface to an external NTC or PTC thermistor, thermocouple, or semiconductor 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 voltage 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.
MAX1978, MAX1979: Typical Operating Circuit MAX1978, MAX1979: Typical Operating Circuit Enlarge+

Key Features

  • Smallest, Safest, Most Accurate Complete Single-Chip Controller
  • On-Chip Power MOSFETS—No External FETs
  • Circuit Footprint < 0.93in²
  • Circuit Height < 3mm
  • Temperature Stability to 0.001°C
  • Integrated Precision Integrator and Chopper Stabilized Op Amps
  • Accurate, Independent Heating and Cooling Current Limits
  • Eliminates Surges By Directly Controlling TEC Current
  • Adjustable Differential TEC Voltage Limit
  • Low-Ripple and Low-Noise Design
  • TEC Current Monitor
  • Temperature Monitor
  • Over- and Undertemperature Alarm
  • Bipolar ±3A Output Current (MAX1978)
  • Unipolar +6A Output Current (MAX1979)

Applications/Uses

  • Automated Test Equipment (ATE)
  • EDFA Optical Amplifiers
  • Fiber Optic Network Equipment
  • Fiber-Optic Laser Modules
  • Telecom Fiber Interfaces
  • WDM, DWDM Laser Diode Temperature Control
Part NumberPrimary TopologyMonitor/Control FeaturesDC-DC/Power FeaturesVIN
(V)
VIN
(V)
VOUT
(V)
VOUT
(V)
Max. IOUT
(A)
Max. IOUT
(A)
Oper. Freq.
(kHz)
Inverting OutputsPackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1978 H-Bridge
Shutdown
Volt. or PWM Controlled Output
Avg. Current Mode Control
Current Limit
Dual/ Multi-Phase
Fixed Freq./PWM
Internal Switch
Soft Start
Sync. Rectifier
TEC Driver
35.5-4.34.36610001
TQFN/48
$15.42 @1k
MAX1979 
Avg. Current Mode Control
Current Limit
Dual/ Multi-Phase
Fixed Freq./PWM
Internal Switch
Soft Start
TEC Driver
TQFN/48
$15.39 @1k
See All Multifunction PMICs (85)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX1978EVKIT: Evaluation Kit for the MAX1978

CAD Symbols and Footprints

  • MAX1978ETM+
  • MAX1978ETM+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

    Quality Management System >
    Environmental Management System >

     
    Status:
    Package:
    Temperature:

    Related Resources


    Belle Isle 2020
    05/29/2020 - 05/31/2020, Detroit, MI
    2020 Detroit Grand Prix - Chevrolet Detroit Grand Prix presented by Lear Fast Facts The Chevrolet Detroit Grand Prix presented by Lear was hosted on Belle Isle, May 29 - 30 2020. The event featured the cars of the NTT IndyCar Series, the IMSA WeatherTech SportsCar Championship and the Trans Am Series presented by Pirelli. The weekend is collectively referred to as the Chevrolet Detroit Grand Prix presented by Lear and it once again featured the Chevrolet Dual in Detroit IndyCar doubleheader.

    RSVP