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Maxim > Products > [Power and Battery Management] 
MAX8520, MAX8521
Smallest TEC Power Drivers for Optical Modules

Industry's Smallest Tec Drivers for SFF/SFP Modules Reduce Heat Generation by 50%


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 340kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX8520/MAX8521 are designed to drive thermoelectric coolers (TECs) in space-constrained optical modules. Both devices deliver ±1.5A output current and control the TEC current to eliminate harmful current surges. On-chip FETs minimize external components and high switching frequency reduces the size of external components.

The MAX8520/MAX8521 operate from a single supply and bias the TEC between the outputs of two synchronous buck regulators. This operation allows for temperature control without "dead zones" or other nonlinearities at low current. 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.

Both devices feature accurate, individually-adjustable heating current limit and cooling current limit along with maximum TEC voltage limit to improve the reliability of optical modules. An analog output signal monitors the TEC current. A unique ripple cancellation scheme helps reduce noise.

The MAX8520 is available in a 5mm x 5mm thin QFN package and its switching frequency is adjustable up to 1MHz through an external resistor. The MAX8521 is also available in a 5mm x 5mm thin QFN as well as space-saving 3mm x 3mm UCSP™ and 36-bump WLP (3mm x 3mm) packages, with a pin-selectable switching frequency of 500kHz or 1MHz.

An evaluation kit is available:  MAX8521EVKIT  

Key Features   Applications/Uses
  • Circuit Footprint of 0.31in²
  • Low-Profile Design
  • On-Chip Power MOSFETs
  • High-Efficiency Switch-Mode Design
  • Ripple Cancellation for Low Noise
  • Direct Current Control Prevents TEC Current Surges
  • 5% Accurate Adjustable Heating/Cooling Current Limits
  • 2% Accurate TEC Voltage Limit
  • No Dead Zone or Hunting at Low Output Current
  • ITEC Monitors TEC Current
  • 1% Accurate Voltage Reference
  • Switching Frequency Up to 1MHz
  • Synchronization (MAX8521)

 
  		• Automated Test Equipment (ATE)
  		• Biotech Lab Equipment
  		• Fiber Optic Network Equipment
  		• Fiber-Optic Laser Modules
  		• SFF/SFP Modules

    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)    		 Package/Pins Smallest Available Pckg.
    (mm2)    		 Price
    min max min max ≥ ≤ max w/pins See Notes
    MAX8520  H-Bridge
    Output OVP
    Shutdown
    Volt. or PWM Controlled Output
    Adj. Frequency
    Avg. Current Mode Control
    Current Limit
    Fixed Freq./PWM
    Internal Pwr. FETs
    Soft Start
    Sync. Rectifier
    TEC Driver
    		 3 5.5 -4.3 4.3 1.5 1.5 1000
    TQFN/20
    		 26 $3.75 @1k
    MAX8521 
    Avg. Current Mode Control
    Current Limit
    Fixed Freq./PWM
    Internal Pwr. FETs
    Soft Start
    Sync. Rectifier
    TEC Driver
    TQFN/20
    UCSP/32
    WLP/32
    		 10 $3.75 @1k
    See All Multifunction PMICs (83)

    Diagram
    MAX8520, MAX8521: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 3264: Compact DWDM laser Temperature Control with the MAX8521 - MAX8520, MAX8521
  		• Application Note 3318: HFAN-08.2.0: Thermoelectric Cooler (TEC) Control - MAX8520, MAX8521
  		• Application Note 3600: HFRD-21.0: 2.5Gbps Cooled TOSA Evaluation Board (Includes MAX3735A Laser Driver and MAX8521 TEC Controller) - MAX8521
  		• Application Note 3766: HFTA-12.0: Measuring Crosstalk Penalty in High-Speed Bidirectional Serial Communication Modules - MAX8520, MAX8521
  		• Application Note 3842: Stabilizing Thermoelectric Controller (TEC) Loops Using a Unit-Step Response - MAX8520, MAX8521

    Evaluation Kits
  		• MAX8521EVKIT

    Reliability Reports
  		• Reliability Report: MAX8520.pdf MAX8521.pdf
  		• Show FIT data for:

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * 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.


    Devices: 1-13 of 13

    MAX8520 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8520EVKIT    
    		Active

    Land Pattern: Not Available

    		See data sheet
    MAX8520ETP    
    		Active TQFN;20 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0009 (PDF)
    Use pkgcode/variation: T2055-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8520ETP-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX8520ETP+  
    		Active TQFN;20 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0009 (PDF)
    Use pkgcode/variation: T2055+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8520ETP+T    
    		Active TQFN;20 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0009 (PDF)
    Use pkgcode/variation: T2055+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8521 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX8521ETP    
    		Active TQFN;20 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0009 (PDF)
    Use pkgcode/variation: T2055-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8521ETP-T    
    		Active TQFN;20 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0009 (PDF)
    Use pkgcode/variation: T2055-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8521ETP+  
    		Active TQFN;20 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0009 (PDF)
    Use pkgcode/variation: T2055+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8521ETP+T    
    		Active TQFN;20 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0009 (PDF)
    Use pkgcode/variation: T2055+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8521EBX    
    		Active UCSP;32 pin;10 mm²
    Outline Drawing: 21-0082 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B36-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8521EBX-T    
    		Active UCSP;32 pin;10 mm²
    Outline Drawing: 21-0082 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: B36-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX8521EWX+T    
    		Active WLP;32 pin;10.11 mm²
    Outline Drawing: 21-0024 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: W363A3+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX8521EWX+  
    		Active WLP;32 pin;10.11 mm²
    Outline Drawing: 21-0024 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: W363A3+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2002-11-14 

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    Document Ref.: 19-2586; Rev 1; 2009-01-07
    This page last modified: 2009-01-07


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