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MAX1979 Datasheet

  • MAX1979

  • Integrated Temperature Controllers for Peltier Modules

  • Maxim   Maxim

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19-2490; Rev 0; 7/02
IT
TION K
VALUA
E
BLE
AVAILA
Integrated Temperature
Controllers for Peltier Modules
General Description
Features
o
Smallest, Safest, Most Accurate Complete
Single-Chip Controller
o
On-Chip Power MOSFETS鈥擭o External FETs
o
Circuit Footprint < 0.93in
2
o
Circuit Height < 3mm
o
Temperature Stability to 0.001擄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
o
o
o
o
TEC Current Monitor
Temperature Monitor
Over- and Undertemperature Alarm
Bipolar 鹵3A Output Current (MAX1978)
Unipolar +6A Output Current (MAX1979)
MAX1978/MAX1979
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 鹵0.001擄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 鹵3A output by biasing the TEC between the outputs
of two synchronous buck regulators. True bipolar operation
controls temperature without 鈥渄ead zones鈥?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擄C to +85擄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.
Ordering Information
PART
MAX1978ETM
MAX1979ETM
*EP
= Exposed pad.
TEMP RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
48 Thin QFN-EP*
48 Thin QFN-EP
Pin Configuration
MAXV
MAXIN
CTLI
V
DD
GND
GND
48
47
46
CS
REF
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
ITEC
OS1
TOP VIEW
MAXIP
COMP
OS2
N.C.
PGND2
LX2
PGND2
LX2
PV
DD
2
N.C.
LX2
PV
DD
2
SHDN
OT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
FREQ
N.C.
PGND1
LX1
PGND1
LX1
PV
DD
1
N.C.
LX1
PV
DD
1
GND
GND
Applications
Fiber Optic Laser Modules
WDM, DWDM Laser-Diode Temperature Control
Fiber Optic Network Equipment
EDFA Optical Amplifiers
Telecom Fiber Interfaces
ATE
Typical Operating Circuit appears at end of data sheet.
MAX1978
MAX1979
INT-
GND
DIFOUT
FB-
FB+
BFB-
BFB+
INTOUT
QFN-EP
*ELECTRICALLY CONNECTED TO THE UNDERSIDE METAL SLUG.
NOTE:
GND IS CONNECTED TO THE UNDERSIDE METAL SLUG.
________________________________________________________________
Maxim Integrated Products
AIN+
AIN-
AOUT
UT
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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