MAX1978ETM+T

Technical Specifications

Product Introduction

Features

• 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 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 highprecision 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.
• 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

• - Fiber Optic Laser Modules - WDM, DWDM Laser-Diode Temperature Control - Fiber Optic Network Equipment - EDFA Optical Amplifiers - Telecom Fiber Interfaces - ATE

Datasheet

Alternative Parts

Common MAX1978ETM+T alternatives overseas buyers search for:

• MAX1978ETM+ (request quote)
• MAX1978ETM (request quote)

Compliance & Export Codes