MAX1978ETM-T

Manufacturer Part NumberMAX1978ETM-T
DescriptionOther Power Management
ManufacturerMaxim Integrated Products
MAX1978ETM-T datasheets

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Specifications of MAX1978ETM-T

Lead Free Status / Rohs StatusLead free / RoHS Compliant  
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19-2490; Rev 3; 3/10
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.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Integrated Temperature
Controllers for Peltier Modules
o Smallest, Safest, Most Accurate Complete
Single-Chip Controller
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
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)
PART
MAX1978ETM+
MAX1979ETM+
* EP = Exposed pad.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
TOP VIEW
+
OS2
1
N.C.
2
PGND2
3
LX2
4
PGND2
5
LX2
6
PV
2
7
DD
N.C.
8
LX2
9
PV
2
10
DD
SHDN
11
OT
12
*ELECTRICALLY CONNECTED TO THE UNDERSIDE METAL SLUG.
NOTE: GND IS CONNECTED TO THE UNDERSIDE METAL SLUG.
Features
2
Ordering Information
T EM P R A N G E
PIN-PACKAGE
- 40°C to + 85°C
48 Thin QFN-EP*
- 40°C to + 85°C
48 Thin QFN-EP*
Pin Configuration
36
FREQ
35
N.C
34
PGND1
33
LX1
32
PGND1
31
LX1
MAX1978
MAX1979
30
PV
1
DD
N.C.
29
28
LX1
27
PV
1
DD
GND
26
GND
25
TQFN-EP
1

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MAX1978ETM-T Summary of contents

  • Page 1

    ... 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) PART MAX1978ETM+ MAX1979ETM Exposed pad. + Denotes a lead(Pb)-free/RoHS-compliant package. TOP VIEW + OS2 1 N.C. ...

  • Page 2

    ... Continuous Power Dissipation (T 48-Lead Thin QFN-EP (derate 26.3mW/°C above +70°C) (Note 2) .................2.105W Operating Temperature Ranges + 0.3V) DD MAX1978ETM ..................................................-40°C to +85°C MAX1979ETM ..................................................-40°C to +85°C + 0.3V) DD Maximum Junction Temperature .....................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C . Applications that forward bias these diodes should not exceed the IC’ ...

  • Page 3

    ELECTRICAL CHARACTERISTICS (continued 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T SHDN unless otherwise noted. Typical values ...

  • Page 4

    Integrated Temperature Controllers for Peltier Modules ELECTRICAL CHARACTERISTICS (continued 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T SHDN DD DD ...

  • Page 5

    ELECTRICAL CHARACTERISTICS ( 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T SHDN unless otherwise noted.) (Note 5) PARAMETER ...

  • Page 6

    Integrated Temperature Controllers for Peltier Modules ELECTRICAL CHARACTERISTICS (continued 5V, FREQ = GND, CTLI = FB+ = FB- = MAXV = MAXIP = MAXIN = REF, T SHDN DD DD ...

  • Page 7

    GND, RTEC = 1Ω, circuit of Figure CTLI FREQ EFFICIENCY vs. TEC CURRENT 1.1Ω TEC ...

  • Page 8

    Integrated Temperature Controllers for Peltier Modules ( GND, RTEC = 1Ω, circuit of Figure CTLI FREQ SWITCHING FREQUENCY CHANGE vs. INPUT SUPPLY -10 -15 -20 -25 ...

  • Page 9

    GND, RTEC = 1Ω, circuit of Figure CTLI FREQ THERMAL STABILITY, ROOM TEMPERATURE TEMPERATURE 0.001°C/div I = +25°C TEC T = +25°C A 4s/div PIN NAME Output Sense 2. ...

  • Page 10

    Integrated Temperature Controllers for Peltier Modules PIN NAME 23 AIN- Undedicated Chopper-Stabilized Amplifier Inverting Input 24 AOUT Undedicated Chopper-Stabilized Amplifier Output Power 1 Inputs. Must be same voltage Bypass to PGND1 with a ...

  • Page 11

    Controllers for Peltier Modules ON OFF SHDN FREQ REF 1.5V REFERENCE MAXV MAX V = TEC MAXV MAXIP MAX TEC MAXIP (0.15V/R ) REF SENSE MAX ...

  • Page 12

    Integrated Temperature Controllers for Peltier Modules Detailed Description The power stage of the MAX1978/MAX1979 thermoelectric cooler (TEC) temperature controllers consists of two switching buck regulators that operate together to directly control TEC current. This configura- tion creates a differential voltage ...

  • Page 13

    Switching Frequency FREQ sets the switching frequency of the internal oscil- lator. The oscillator frequency is 500kHz when FREQ = GND. The oscillator frequency is 1MHz when FREQ = V . The 1MHz setting allows minimum inductor and fil- DD ...

  • Page 14

    Integrated Temperature Controllers for Peltier Modules 10µF 0.01µF UNDERTEMP ALARM OVERTEMP ALARM DC CURRENT MONITOR 20kΩ 1% 80.6kΩ 1µF THERMISTOR VOLTAGE MONITOR REF 69.8kΩ 105kΩ Figure 2. MAX1979 Typical Application Circuit. MAXIN sets the maximum TEC current circuit ...

  • Page 15

    REF 69.8kΩ 1% AIN+ AOUT 80.6kΩ 1% AIN- 20kΩ 1% MAX1978 BFB- MAX1979 x50 FB- V FB+ Figure 3. Thermistor Voltage Monitor Design Procedure Inductor Selection Small surface-mount inductors are ideal for use with the MAX1978/MAX1979. Select the output inductors ...

  • Page 16

    Integrated Temperature Controllers for Peltier Modules The MAX1979 controls the TEC current in only one direction (unipolar). Set the maximum unipolar TEC cur- rent by applying a voltage to MAXIP. Connect MAXIN to MAXIP when using the MAX1979. The equation ...

  • Page 17

    Drive SHDN low to place the MAX1978/MAX1979 in a power-saving shutdown mode. When the MAX1978/ MAX1979 are in shutdown, the TEC is off (V V decay to GND) and input supply current lowers to OS2 2mA (typ). ITEC is a ...

  • Page 18

    Integrated Temperature Controllers for Peltier Modules where The gain needed to move the 0dB crossover point up to the desired frequency. In this case -4dB = 0. The desired crossover frequency, 1.5Hz in this ...

  • Page 19

    INPUT 3V TO 5.5V ON OFF OVERTEMP ALARM UNDERTEMP ALARM TEMP MONITOR TEC CURRENT MONITOR VOLTAGE LIMIT HEATING CURRENT LIMIT COOLING CURRENT LIMIT Chip Information TRANSISTOR COUNT: 6023 PROCESS: BiCMOS ______________________________________________________________________________________ Integrated Temperature Controllers for Peltier Modules Typical Operating Circuit ...

  • Page 20

    ... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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