MAX1969

Power Drivers for Peltier TEC Modules

Smallest, EMI Optimized TEC Controller, Internal FETs, 0.01°C Temperature Control


Please check latest availability status for a specific part variant.

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 switching frequency and a unique ripple cancellation scheme reduce component size and noise.

The MAX1968 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 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 independently 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 evaluation kit is available to speed designs.
MAX1968, MAX1969: Typical Operating Circuit MAX1968, MAX1969: Typical Operating Circuit Enlarge+

Key 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

Applications/Uses

  • Automated Test Equipment (ATE)
  • Biotech Lab Equipment
  • 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
MAX1968 H-Bridge
Output OVP
Shutdown
Volt. or PWM Controlled Output
Adj. Frequency
Current Limit
Fixed Freq./PWM
Internal Switch
Soft Start
Sync. Rectifier
TEC Driver
35.5-4.34.33310001
TSSOP/28
$10.69 @1k
MAX1969 66
TSSOP/28
$18.47 @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.


MAX1968EVKIT: Evaluation Kit for the MAX1968

Technical Documents

Tutorial 3318 HFAN-08.2.0: How to Control and Compensate a Thermoelectric Cooler (TEC)

Quality and Environmental Data

Request Reliability Report for: MAX1969 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX1969EUI+
  • 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 >

     
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