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.
Key Features
Applications/Uses
Direct Current Control Prevents TEC Current Surges
On-Chip Power MOSFETs
High-Efficiency Switch-Mode Design
Ripple Cancellation for Low Noise
No Dead-Zone or Hunting at Low-Output Current
Adjustable TEC Voltage Limit
Separately Adjustable Heating and Cooling Current Limits
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 prices
and delivery, please see the price and availability page
or contact an authorized distributor.
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