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Maxim > Products > [LED Lighting and LCD Display ICs] 
MAX6972, MAX6973
16-Output PWM LED Drivers for Message Boards

EZCascade™ LVDS Serial Interface Running at 35Mbps for Easy and Economical Designing and Manufacturing of Large Displays


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Data Sheet
FULL DATA SHEET (PDF, 720kB)
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Description
The MAX6972/MAX6973 precision current-sinking, 16-output PWM LED drivers drive red, green, and/or blue LEDs for full-color graphic message boards and video displays. Each output has an individual 12-bit (MAX6972) or 14-bit (MAX6973) PWM-intensity (hue) control and 7-bit (MAX6972) or 5-bit (MAX6973) global PWM intensity (luminance) control. The MAX6972/MAX6973 also feature open-circuit LED fault-detection circuitry, as well as a watchdog timer.

The driver has two banks of eight outputs, with each bank intended to drive a different color in RGB applications. The standard application uses three MAX6972/MAX6973s to drive eight RGB LEDs. The full-scale current for each bank of eight outputs is adjustable from 11mA to 55mA in 256 steps (0.3125% per step) to calibrate each color.

The MAX6972/MAX6973 can optionally multiplex by using outputs active-low MUX0 and active-low MUX1, which each drive an external pnp transistor. Multiplexing doubles the MAX6972/MAX6973 drive capability to 32 LEDs.

The MAX6972/MAX6973 operate from a 3.0V to 3.6V power supply. The LED power supply can range from 3V to 7V. The LED drivers require only 0.8V headroom above the LEDs' forward-voltage drop. Using a separate LED supply voltage for each LED minimizes power consumption.

The serial interface uses differential signaling for the high-speed clock and data signals to reduce EMI and improve signal integrity. The MAX6972/MAX6973 buffer all interface signals to simplify cascading devices in modules that use a large number of drivers.

An internal watchdog timer, when enabled, automatically clears the pixel-data registers and blanks the display if any of the signal inputs fail to toggle within 40ms.

The MAX6972/MAX6973 are available in 32-pin TQFN packages and operate over the -40°C to +125°C temperature range.

Refer to the MAX6974/MAX6975 data sheet for a 24-output, 6mA to 30mA software-compatible device.

NOTE: This product requires use of the following:

  • MAX6972 EVKIT Software

    Key Features   Applications/Uses
    • 16 LED Current Sink Outputs (Two Banks of Eight Outputs)
    • 32 LED Drive Option When Multiplexing
    • 33MHz Clock Supports Up to 63 Frames per Second of Video
    • Constant Output Current Calibration from 11mA to 55mA in 256 Steps
    • EZCascade™ Interface Simplifies Multiple Driver Cascading Without External Buffers
    • 12-Bit or 14-Bit Individual PWM LED Intensity Controls
    • 7-Bit or 5-Bit Panel PWM-Intensity Control
    • +3V to +7V LED Power Supply
    • +3.0V to +3.6V Logic Supply
    • Open-Circuit LED Fault Detection
    • Optional Watchdog Timer Blanks Display if Interface Fails
    • Standard -40°C to +125°C Operating Temperature Range

    		 
  		• Graphic Panels
  		• LED Message Boards
  		• LED Video Display Panels
  		• Signs
  		• Variable Message Signs (VMS)

    Diagram
    MAX6972, MAX6973: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 4111: Eliminating Ghost-Image Currents in Color-LED Display Systems Using the MAX6972–MAX6975 LED Drivers - MAX6972, MAX6973

    Evaluation Kits
  		• MAX6972EVKIT

    Design Guides
  		• High-Speed Interconnect (PDF)
  		• Displays (PDF)

    Reliability Reports
  		• Reliability Report: MAX6972.pdf
  		• Show FIT data for:
  		• Request Reliability Report for:

    Software/Models
  		• MAX6972 EVKIT Software

    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: 1-8 of 8

    MAX6972 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6972ATJ+T    
    		TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0013 (PDF)
    Use pkgcode/variation: T3255+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6972ATJ+  
    		TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0013 (PDF)
    Use pkgcode/variation: T3255+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6972ATJ  
    		TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0013 (PDF)
    Use pkgcode/variation: T3255-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6972ATJ-T    


    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX6973 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX6973ATJ+T    


    Land Pattern: Not Available

    		-40°C to +125°C See data sheet
    MAX6973ATJ+  
    		TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0013 (PDF)
    Use pkgcode/variation: T3255+5*
    		-40°C to +125°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX6973ATJ  
    		TQFN;32 pin;26 mm²
    Outline Drawing: 21-0140 (PDF)
    Land Pattern: 90-0013 (PDF)
    Use pkgcode/variation: T3255-5*
    		-40°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX6973ATJ-T    


    Land Pattern: Not Available

    		-40°C to +125°C See data sheet

    More Information
  		• New Product Press Release 2006-05-31 
  		• Product Ad: Download

    Related Products
    MAX6971 16-Port, 36V Constant-Current LED Driver
    MAX6979 16-Port, 5.5V Constant-Current LED Driver with LED Fault Detection and Watchdog
    MAX6969 16-Port, 5.5V Constant-Current LED Driver
    MAX6974, MAX6975 24-Output PWM LED Drivers for Message Boards
    MAX6960, MAX6961, MAX6962, MAX6963 4-Wire Serially Interfaced 8 x 8 Matrix Graphic LED Drivers

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     Description 
     Key Features 
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    Document Ref.: 19-0534; Rev 0; 2006-05-22
    This page last modified: 2007-08-03


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