MAX1978/MAX1979
Integrated Temperature
Controllers for Peltier Modules
General Description
Features
o Smallest, Safest, Most Accurate Complete
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-can-
cellation 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 ±0.001ꢀC temperature
stability. Output current, rather than voltage, is directly con-
trolled to eliminate current surges. Individual heating and
cooling current and voltage limits provide the highest level of
TEC protection.
Single-Chip Controller
o On-Chip Power MOSFETS—No External FETs
2
o Circuit Footprint < 0.93in
o Circuit Height < 3mm
o Temperature Stability to 0.001°C
o Integrated Precision Integrator and Chopper
Stabilized Op Amps
o Accurate, Independent Heating and Cooling
Current Limits
o Eliminates Surges By Directly Controlling
TEC Current
o Adjustable Differential TEC Voltage Limit
o Low-Ripple and Low-Noise Design
o TEC Current Monitor
The MAX1978 operates from a single supply and provides
bipolar ±±A output by biasing the TEC between the outputs
of two synchronous buck regulators. True bipolar operation
controls temperature without “dead zones” or other nonlin-
earities 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.
o Temperature Monitor
o Over- and Undertemperature Alarm
o Bipolar 3A Output Current (MAX1978)
o Unipolar +6A Output Current (MAX1979)
Ordering Information
A chopper-stabilized instrumentation amplifier and a high-
precision integrator amplifier are supplied to create a pro-
portional-integral (PI) or proportional-integral-derivative (PID)
controller. The instrumentation amplifier can interface to an
external NTC or PTC thermistor, thermocouple, or semicon-
ductor 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 volt-
age reference provides bias for a thermistor bridge.
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
48 Thin QFN-EP*
48 Thin QFN-EP*
MAX1978ETM+
MAX1979ETM+
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
The MAX1978/MAX1979 are available in a low-profile
48-lead thin QFN-EP package and is specified over the
-40ꢀC to +85ꢀC temperature range. The thermally
enhanced QFN-EP package with exposed metal pad
minimizes operating junction temperature. An evaluation
kit is available to speed designs.
36
35
34
33
32
31
30
29
28
27
26
25
OS2
N.C.
1
2
FREQ
N.C
+
PGND2
LX2
3
PGND1
LX1
4
PGND2
LX2
5
PGND1
LX1
6
MAX1978
MAX1979
Applications
PV
2
DD
7
PV
1
DD
N.C.
LX1
N.C.
LX2
8
Fiber Optic Laser Modules
9
PV
2
DD
10
PV
DD
1
WDM, DWDM Laser-Diode Temperature Control
Fiber Optic Network Equipment
EDFA Optical Amplifiers
GND
GND
SHDN 11
OT 12
Telecom Fiber Interfaces
ATE
TQFN-EP
*ELECTRICALLY CONNECTED TO THE UNDERSIDE METAL SLUG.
Typical Operating Circuit appears at end of data sheet.
NOTE: GND IS CONNECTED TO THE UNDERSIDE METAL SLUG.
For pricing, delivery, and ordering information, please contact Maxim Direct
19-2490; Rev ±; ±/10
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
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