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19-2490; Rev 0; 7/02
EVAALVUAAILTAIOBNLEKIT
Integrated Temperature
Controllers for Peltier Modules
General Description
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.
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.
Features
o Smallest, Safest, Most Accurate Complete
Single-Chip Controller
o On-Chip Power MOSFETS—No External FETs
o Circuit Footprint < 0.93in2
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
o Temperature Monitor
o Over- and Undertemperature Alarm
o Bipolar ±3A Output Current (MAX1978)
o Unipolar +6A Output Current (MAX1979)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX1978ETM
-40°C to +85°C 48 Thin QFN-EP*
MAX1979ETM
-40°C to +85°C 48 Thin QFN-EP
*EP = Exposed pad.
Pin Configuration
TOP VIEW
OS2
N.C.
PGND2
LX2
PGND2
LX2
PVDD2
N.C.
LX2
PVDD2
SHDN
OT
1
2
3
4
5
6
7
8
9
10
11
12
MAX1978
MAX1979
36 FREQ
35 N.C.
34 PGND1
33 LX1
32 PGND1
31 LX1
30 PVDD1
29 N.C.
28 LX1
27 PVDD1
26 GND
25 GND
QFN-EP
*ELECTRICALLY CONNECTED TO THE UNDERSIDE METAL SLUG.
NOTE: GND IS CONNECTED TO THE UNDERSIDE METAL SLUG.
________________________________________________________________ Maxim Integrated Products 1
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.

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Integrated Temperature
Controllers for Peltier Modules
ABSOLUTE MAXIMUM RATINGS
VDD to GND ..............................................................-0.3V to +6V
SHDN, MAXV, MAXIP, MAXIN,
CTLI, OT, UT to GND............................................-0.3V to +6V
FREQ, COMP, OS1, OS2, CS, REF, ITEC, AIN+, AIN-,
AOUT, INT-, INTOUT, BFB+, BFB-, FB+, FB-,
DIFOUT to GND......................................-0.3V to (VDD + 0.3V)
PVDD1, PVDD2 to VDD ...........................................-0.3V to +0.3V
PVDD1, PVDD2 to GND...............................-0.3V to (VDD + 0.3V)
PGND1, PGND2 to GND .......................................-0.3V to +0.3V
COMP, REF, ITEC, OT, UT, INTOUT, DIFOUT,
BFB-, BFB+, AOUT Short to GND .............................Indefinite
Peak LX Current (MAX1978) (Note 1).................................±4.5A
Peak LX Current (MAX1979) (Note 1)....................................+9A
Continuous Power Dissipation (TA = +70°C)
48-Lead Thin QFN-EP
(derate 26.3mW/°C above +70°C) (Note 2) .................2.105W
Operating Temperature Ranges
MAX1978ETM ..................................................-40°C to +85°C
MAX1979ETM ..................................................-40°C to +85°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: LX has internal clamp diodes to PGND and PVDD. Applications that forward bias these diodes should not exceed the ICs
package power dissipation limits.
Note 2: Solder underside metal slug to PC board ground plane.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = PVDD1 = PVDD2 = SHDN = 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA = 0°C to +85°C,
unless otherwise noted. Typical values at TA = +25°C.)
PARAMETER
Input Supply Range
SYMBOL
VDD
CONDITIONS
VDD = 5V, ITEC = 0 to ±3A,
VOUT = VOS1 - VOS2 (MAX1978)
MIN TYP MAX UNITS
3.0 5.5 V
-4.3 +4.3
Output Voltage Range
VOUT
VDD = 5V, ITEC = 0 to 6A,
VOUT = VOS1 (MAX1979)
VDD = 3V, ITEC = 0 to ±3A,
VOUT = VOS1 - VOS2 (MAX1978)
4.3
V
-2.3 +2.3
Maximum TEC Current
Reference Voltage
Reference Load Regulation
Current-Sense Threshold
NFET On-Resistance
PFET On-Resistance
NFET Leakage
ITEC(MAX)
VREF
VREF
RDS(ON-N)
RDS(ON-P)
ILEAK(N)
VDD = 3V, ITEC = 0 to 6A,
VOUT = VOS1 (MAX1979)
MAX1978
MAX1979
VDD = 3V to 5.5V, IREF = 150µA
VDD = 3V to 5.5V, IREF = +10µA to -1mA
VOS1 < VCS
VMAXI_ = VREF
VMAXI_ = VREF/3
VOS1 > VCS
VMAXI_ = VREF
VMAXI_ = VREF/3
VDD = 5V, I = 0.5A
VDD = 3V, I = 0.5A
VDD = 5V, I = 0.5A
VDD = 3V, I = 0.5A
VLX = VDD = 5V, TA = +25°C
VLX = VDD = 5V, TA = +85°C
2.3
1.485
135
40
135
40
1.500
1.2
150
50
150
50
0.04
0.06
0.06
0.09
0.02
1
±3
6
1.515
5
160
60
160
60
0.07
0.08
0.10
0.12
10
A
V
mV
mV
µA
2 _______________________________________________________________________________________

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Integrated Temperature
Controllers for Peltier Modules
ELECTRICAL CHARACTERISTICS (continued)
(VDD = PVDD1 = PVDD2 = SHDN = 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA = 0°C to +85°C,
unless otherwise noted. Typical values at TA = +25°C.)
PARAMETER
PFET Leakage
No-Load Supply Current
Shutdown Supply Current
Thermal Shutdown
UVLO Threshold
Switching Frequency Internal
Oscillator
OS1, OS2, CS Input Current
SHDN, FREQ Input Current
SYMBOL
CONDITIONS
ILEAK(P)
VLX = 0, TA = +25°C
VLX = 0, TA = +85°C
IDD(NO
LOAD)
IDD-SD
TSHUTDOWN
VDD = 5V
VDD = 3.3V
SHDN = GND, VDD = 5V (Note 3)
Hysteresis = 15°C
VUVLO
VDD rising
VDD falling
fSW-INT
FREQ = GND
FREQ=VDD
IOS1, IOS2,
ICS
0 or VDD
ISHDN,
IFREQ
0 or VDD
SHDN, FREQ Input Low Voltage
VIL VDD = 3V to 5.5V
SHDN, FREQ Input High Voltage
VIH VDD = 3V to 5.5V
MAXV Threshold Accuracy
MAXV, MAXIP, MAXIN
Input Bias Current
CTLI Gain
CTLI Input Resistance
Error Amp Transconductance
ITEC Accuracy
ITEC Load Regulation
Instrumentation Amp Input Bias
Current
VMAXV = VREF 0.67,
VOS1 to VOS2 = ±4V, VDD = 5V
VMAXV = VREF 0.33,
VOS1 to VOS2 = ±2V, VDD = 3V
IMAXV-BIAS,
IMAXI_-BIAS
ACTLI
RCTLI
gm
VMAXV = VMAXI_ = 0.1V or 1.5V
VCTLI = 0.5V to 2.5V (Note 4)
1Mterminated at REF
VOS1 to VCS = +100mV or -100mV
VITEC
VOS1 to VCS = +100mV or -100mV,
IITEC = ±10µA
IDIF-BIAS
MIN
2.4
2.25
450
800
-100
TYP
0.02
1
30
15
2
165
2.6
2.5
500
1000
MAX
10
UNITS
µA
50
30
3
2.8
2.75
650
1200
mA
mA
°C
V
kHz
+100
µA
-5
0.75 ×
VDD
-1
-2
+5
0.25 ×
VDD
µA
V
V
+1
%
+2
-0.1
+0.1
µA
9.5 10 10.5 V/V
0.5 1.0 2.0 M
50 100 175 µS
-10 +10 %
-0.1
+0.1
%
-10 0 +10 nA
Instrumentation Amp Offset
Voltage
VDIF-OS VDD = 3V to 5.5V
-200 +20 +200
µV
Instrumentation Amp Offset-
Voltage Drift with Temperature
VDD = 3V to 5.5V
0.1 µV/°C
Instrumentation Amp Preset
Gain
ADIF
RLOAD = 10kto REF
45 50 55 V/V
_______________________________________________________________________________________ 3

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Integrated Temperature
Controllers for Peltier Modules
ELECTRICAL CHARACTERISTICS (continued)
(VDD = PVDD1 = PVDD2 = SHDN = 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA = 0°C to +85°C,
unless otherwise noted. Typical values at TA = +25°C.)
PARAMETER
Integrator Amp Open-Loop Gain
Integrator Amp CMRR
Integrator Amp Input Bias Current
Integrator Amp Voltage Offset
Integrator Amp Gain Bandwidth
Undedicated Chopper Amp
Open-Loop Gain
SYMBOL
AOL-INT
CMRRINT
IINT-BIAS
VINT-OS
GBWINT
AOL-AIN
CONDITIONS
RLOAD = 10kto REF
VDD = 3V to 5.5V
VDD = 3V to 5.5V
RLOAD = 10kto REF
MIN TYP MAX UNITS
120 dB
100 dB
1 nA
-3 +0.1 +3
mV
100 kHz
120 dB
Undedicated Chopper Amp
CMRR
CMRRAIN
85 dB
Undedicated Chopper Amp Input
Bias Current
IAIN-BIAS VDD = 3V to 5.5V
-10 0 +10 nA
Undedicated Chopper Amp
Offset Voltage
VAIN-OS VDD = 3V to 5.5V
-200 +10 +200
µV
Undedicated Chopper Amp Gain
Bandwidth
GBWAIN
100 kHz
Undedicated Chopper Amp
Output Ripple
BFB_ Buffer Error
UT and OT Leakage Current
UT and OT Output Low Voltage
UT Trip Threshold
OT Trip Threshold
VRIPPLE A = 5
ILEAK
VOL
CLOAD < 100pF
V UT = V OT = 5.5V
Sinking 4mA
FB+ - FB- (see Typical Application Circuit)
FB+ - FB- (see Typical Application Circuit)
-200
20
0 +200
1
50 150
-20
20
mV
µV
µA
mV
mV
mV
4 _______________________________________________________________________________________

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Integrated Temperature
Controllers for Peltier Modules
ELECTRICAL CHARACTERISTICS
(VDD = PVDD1 = PVDD2 = SHDN = 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, TA = -40°C to +85°C,
unless otherwise noted.) (Note 5)
PARAMETER
Input Supply Range
SYMBOL
VDD
CONDITIONS
VDD = 5V, ITEC = 0 to ±3A,
VOUT = VOS1 -VOS2 (MAX1978)
MIN MAX UNITS
3 5.5 V
-4.3 +4.3
Output Voltage Range
VOUT
VDD = 5V, ITEC = 0 to 6A,
VOUT = VOS1 (MAX1979)
VDD = 3V, ITEC = 0 to ±3A,
VOUT = VOS1 - VOS2 (MAX1978)
4.3
V
-2.3 +2.3
Maximum TEC Current
Reference Voltage
Reference Load Regulation
Current-Sense Threshold
No-Load Supply Current
Shutdown Supply Current
UVLO Threshold
Switching Frequency Internal
Oscillator
OS1, OS2, CS Input Current
VDD = 3V, ITEC = 0 to 6A,
VOUT = VOS1 (MAX1979)
MAX1978
ITEC(MAX)
MAX1979
VREF VDD = 3V to 5.5V, IREF = 150µA
VREF
VDD = 3V to 5.5V,
IREF = 10µA to -1mA
VOS1 < VCS
VOS1 > VCS
VMAXI_ = VREF
VMAXI_ = VREF/3
VMAXI_ = VREF
VMAXI_ = VREF/3
IDD(NO
LOAD)
IDD-SD
VDD = 5V
VDD = 3.3V
SHDN = GND, VDD = 5V (Note 3)
VUVLO
VDD rising
VDD falling
fSW-INT
FREQ = GND
FREQ = VDD
IOS1, IOS2,
ICS
0 or VDD
1.475
135
40
135
40
2.4
2.25
450
800
-100
2.3
±3
6
1.515
5
160
60
160
60
50
30
3
2.8
2.75
650
1200
+100
A
V
mV
mV
mA
mA
V
kHz
µA
SHDN, FREQ Input Current
I SHDN,
I FREQ
0 or VDD
-5 +5 µA
SHDN, FREQ Input Low Voltage
VIL VDD = 3V to 5.5V
0.25
VDD
V
SHDN, FREQ Input High Voltage
VIH VDD = 3V to 5.5V
0.75
VDD
V
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