MAX1968

PRODUCTION

Power Drivers for Peltier TEC Modules

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

Data Sheet (Rev. 3) Product Selection Table

Part Models: 2
1ku List Price: Starting From $14.00

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Overview

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

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.

Applications

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 Models: 2
1ku List Price: Starting From $14.00

Documentation

Data Sheet 1

MAX1968-MAX1969: Power Drivers for Peltier TEC Modules Data Sheet (Rev.3) 06/19/2015

Reliability Data 1

MAX1968 Reliability Data 01/12/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX1968EUI+	28-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX1968EUI+T	28-TSSOP_4.4_EP-4.4_MM	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

Software Development 1

MAX1968EVKIT Software, 1.10.0

Evaluation Kits

Evaluation Kit for the MAX1968

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Features and Benefits

±3A Output Current

Operates from a Single Supply (3.0V to 5.5V)

High-Efficiency Switch-Mode Design

500kHz or 1MHz Switching Frequency

Programmable Heating/Cooling Limit

TEC Current-Monitor Output

SPI™-Compatible Serial Interface

Easy-to-Use Menu-Driven Software

Includes Windows 95/98/2000-Compatible Software and Demo PC Board

Surface-Mount Construction

Fully Assembled and Tested

Product Details

The MAX1968 evaluation kit (EV kit) is a fully assembled and tested PC board that implements a switch-mode driver for a Peltier thermoelectric cooler (TEC) module. It operates from a single 3.0V to 5.5V supply and provides a bipolar ±3A (max) output to the module.

A potentiometer, DAC, or external source generates a DC temperature set-point voltage. Thermal feedback from the TEC module is compared to the set-point voltage to generate the TEC current-control signal. The MAX1968 accurately regulates the TEC current based on this signal.

When using the DAC, the EV kit connects to the parallel port of a computer running Windows® 95, 98, or 2000. Software, included with the EV kit, provides a quick and easy method to control the DAC.

Note: Windows 2000 requires the installation of a driver. Refer to Win2000.pdf or Win2000.txt located on the diskette.