MAX1978 Maxim, MAX1978 Datasheet
MAX1978
Manufacturer Part Number
MAX1978
Description
Integrated Temperature Controllers for Peltier Modules
Manufacturer
Maxim
Datasheet
1.MAX1978.pdf
(20 pages)
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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 ±0.001°C 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.
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 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.
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.
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.
19-2490; Rev 0; 7/02
Typical Operating Circuit appears at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Fiber Optic Laser Modules
WDM, DWDM Laser-Diode Temperature Control
Fiber Optic Network Equipment
EDFA Optical Amplifiers
Telecom Fiber Interfaces
ATE
________________________________________________________________ Maxim Integrated Products
General Description
Applications
Controllers for Peltier Modules
Integrated Temperature
o Smallest, Safest, Most Accurate Complete
o On-Chip Power MOSFETS—No External FETs
o Circuit Footprint < 0.93in
o Circuit Height < 3mm
o Temperature Stability to 0.001°C
o Integrated Precision Integrator and Chopper
o Accurate, Independent Heating and Cooling
o Eliminates Surges By Directly Controlling
o Adjustable Differential TEC Voltage Limit
o Low-Ripple and Low-Noise Design
o TEC Current Monitor
o Temperature Monitor
o Over- and Undertemperature Alarm
o Bipolar ±3A Output Current (MAX1978)
o Unipolar +6A Output Current (MAX1979)
*EP = Exposed pad.
MAX1978ETM
MAX1979ETM
Single-Chip Controller
Stabilized Op Amps
Current Limits
TEC Current
PART
PGND2
PGND2
TOP VIEW
PV
PV
SHDN
OS2
N.C.
N.C.
LX2
LX2
LX2
DD
DD
OT
2
2
*ELECTRICALLY CONNECTED TO THE UNDERSIDE METAL SLUG.
NOTE: GND IS CONNECTED TO THE UNDERSIDE METAL SLUG.
10
11
12
1
2
3
4
5
6
7
8
9
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
QFN-EP
MAX1978
MAX1979
Pin Configuration
2
PIN-PACKAGE
48 Thin QFN-EP*
48 Thin QFN-EP
Features
36
35
34
33
32
31
30
29
28
27
26
25
FREQ
N.C.
PGND1
LX1
PGND1
LX1
PV
N.C.
LX1
PV
GND
GND
DD
DD
1
1
1
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