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MAX1968, MAX1969
Power Drivers for Peltier TEC Modules
Smallest, EMI Optimized TEC Controller, Internal FETs, 0.01°C Temperature Control
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Status
Active: In Production.
Description
The MAX1968/MAX1969 are highly integrated and cost-effective, high-efficiency, switch-mode drivers for Peltier thermoelectric cooler (TEC) modules. Both devices utilize direct current control to eliminate current surges in the TEC. On-chip FETs minimize external components while providing high efficiency. A 500kHz/1MHz switching frequency and a unique ripple cancellation scheme reduce component size and noise.
The MAX1968 operates from a single supply and provides bipolar ±3A output by biasing the TEC between the outputs of two synchronous buck regulators. Bipolar operation allows for temperature control without "dead zones" or other nonlinearities at low load currents. This arrangement ensures that the control system does not hunt when the set point is very close to the natural operating point, requiring a small amount of heating or cooling. An analog control signal precisely sets the TEC current. The MAX1969 provides unipolar output up to 6A. Reliability is optimized with settable limits for both
TEC voltage and current, with independently set limits for heating and cooling current. An analog output also monitors TEC current.
The MAX1968/MAX1969 are available in a low-profile 28-pin TSSOP-EP package and is specified over the -40°C to +85°C temperature range. The thermally-enhanced TSSOP-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: MAX1968EVKIT
Key Features
- Direct Current Control Prevents TEC Current Surges
- On-Chip Power MOSFETs
- High-Efficiency Switch-Mode Design
- Ripple Cancellation for Low Noise
- No Dead-Zone or Hunting at Low-Output Current
- Adjustable TEC Voltage Limit
- Separately Adjustable Heating and Cooling Current Limits
- ITEC Output Monitors TEC Current
- 1% Accurate Voltage Reference
- 500kHz/1MHz Switching Frequency
- ±3A Output Current (MAX1968)
- 6A Output Current (MAX1969)
- Thermally Enhanced TSSOP-EP Package
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Applications/Uses
- Automated Test Equipment (ATE)
- Biotech Lab Equipment
- 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 |
| MAX1968 |
H-Bridge |
| Output OVP | | Shutdown | | Volt. or PWM Controlled Output |
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| Adj. Frequency | | Current Limit | | Fixed Freq./PWM | | Internal Pwr. FETs | | Soft Start | | Sync. Rectifier | | TEC Driver |
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3 |
5.5 |
-4.3 |
4.3 |
3 |
3 |
1000 |
1 |
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63.7 |
$8.94 @1k |
| MAX1969 |
6 |
6 |
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$10.73 @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
| Reliability Report: |
MAX1968.pdf |
| Show FIT data for: |
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| Request Reliability Report for: |
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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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| MAX1968EUI
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Active |
TSSOP-EP;28 pin;63.7 mm²
Outline Drawing:21-0108 (PDF)
Land Pattern: 90-0146 (PDF)
Use pkgcode/variation: U28E-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1968EUI+
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Active |
TSSOP-EP;28 pin;63.7 mm²
Outline Drawing:21-0108 (PDF)
Land Pattern: 90-0146 (PDF)
Use pkgcode/variation: U28E+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1968EUI+T
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Active |
TSSOP-EP;28 pin;63.7 mm²
Outline Drawing:21-0108 (PDF)
Land Pattern: 90-0146 (PDF)
Use pkgcode/variation: U28E+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1968EUI-T
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Active |
TSSOP;28 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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| MAX1969EUI
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Active |
TSSOP-EP;28 pin;63.7 mm²
Outline Drawing:21-0108 (PDF)
Land Pattern: 90-0146 (PDF)
Use pkgcode/variation: U28E-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1969EUI+
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Active |
TSSOP-EP;28 pin;63.7 mm²
Outline Drawing:21-0108 (PDF)
Land Pattern: 90-0146 (PDF)
Use pkgcode/variation: U28E+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1969EUI+T
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Active |
TSSOP;28 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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| MAX1969EUI-T
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Active |
TSSOP;28 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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Similar Products by Function
Evaluation Kits
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More Information
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Information Index
Document Ref.: 19-2447
Rev 2;
2007-02-28
This page last modified: 2009-05-29
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