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MAX1978, MAX1979
Integrated Temperature Controllers for Peltier Modules
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Status
Active: In Production.
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-cancellation 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 controlled 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 nonlinearities 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 proportional-integral (PI) or proportional-integral-derivative (PID) controller. The instrumentation amplifier can interface to an external NTC or PTC thermistor, thermocouple, or semiconductor 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 voltage 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.
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Data Sheet
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An evaluation kit is available: MAX1978EVKIT
Key Features
- Smallest, Safest, Most Accurate Complete Single-Chip Controller
- On-Chip Power MOSFETS—No External FETs
- Circuit Footprint < 0.93in²
- Circuit Height < 3mm
- Temperature Stability to 0.001°C
- Integrated Precision Integrator and Chopper Stabilized Op Amps
- Accurate, Independent Heating and Cooling Current Limits
- Eliminates Surges By Directly Controlling TEC Current
- Adjustable Differential TEC Voltage Limit
- Low-Ripple and Low-Noise Design
- TEC Current Monitor
- Temperature Monitor
- Over- and Undertemperature Alarm
- Bipolar ±3A Output Current (MAX1978)
- Unipolar +6A Output Current (MAX1979)
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Applications/Uses
- Automated Test Equipment (ATE)
- EDFA Optical Amplifiers
- Fiber Optic Network Equipment
- Fiber-Optic Laser Modules
- Telecom Fiber Interfaces
- WDM, DWDM Laser Diode Temperature Control
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Key Specifications:
| Multifunction PMICs |
| Part Number |
Primary Topology |
Monitor/Control Features |
DC-DC/Power Features |
VIN
(V) |
VIN
(V) |
VOUT
(V) |
VOUT
(V) |
Max. IOUT
(A) |
Max. IOUT
(A) |
Oper. Freq.
(kHz) |
Inverting Outputs |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| min |
max |
min |
max |
≥ |
≤ |
max w/pins |
See Notes |
| MAX1978 |
H-Bridge |
| Shutdown | | Volt. or PWM Controlled Output |
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| Avg. Current Mode Control | | Current Limit | | Dual/ Multi-Phase | | Fixed Freq./PWM | | Internal Pwr. FETs | | Soft Start | | Sync. Rectifier | | TEC Driver |
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3 |
5.5 |
-4.3 |
4.3 |
6 |
6 |
1000 |
1 |
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50.4 |
$10.85 @1k |
| MAX1979 |
| Avg. Current Mode Control | | Current Limit | | Dual/ Multi-Phase | | Fixed Freq./PWM | | Internal Pwr. FETs | | Soft Start | | TEC Driver |
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$11.02 @1k |
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See All Multifunction PMICs (96)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
Application Notes
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1978ETM
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Active |
TQFN;48 pin;50.4 mm²
Outline Drawing:21-0144 (PDF)
Land Pattern: 90-0132 (PDF)
Use pkgcode/variation: T4877-6*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1978ETM+
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Active |
TQFN;48 pin;50.4 mm²
Outline Drawing:21-0144 (PDF)
Land Pattern: 90-0132 (PDF)
Use pkgcode/variation: T4877+6*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1978ETM+T
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Active |
TQFN;48 pin;50.4 mm²
Outline Drawing:21-0144 (PDF)
Land Pattern: 90-0132 (PDF)
Use pkgcode/variation: T4877+6*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1978ETM-T
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Active |
QFN;48 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1979ETM
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Active |
TQFN;48 pin;50.4 mm²
Outline Drawing:21-0144 (PDF)
Land Pattern: 90-0132 (PDF)
Use pkgcode/variation: T4877-6*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1979ETM+
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Active |
TQFN;48 pin;50.4 mm²
Outline Drawing:21-0144 (PDF)
Land Pattern: 90-0132 (PDF)
Use pkgcode/variation: T4877+6*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1979ETM+T
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Active |
QFN;
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1979ETM-T
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Active |
QFN;48 pin
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Document Ref.: 19-2490
Rev 3;
2010-03-05
This page last modified: 2010-03-05
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