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  • Manufacturer:
  • Newark Part No.: 08R5258
  • Manufacturer Part No CAT4008W-T2

Product Specifications, Documents & More

  • Device Topology: Constant Current
  • Dimming Control Type: PWM
  • Driver Case Style: SOIC
  • Input Voltage: 3V to 5.5V
  • Input Voltage Max: 5.5V
  • Input Voltage Min: 3V
  • LED Driver Application: Billboard Display, Marquee Display, General Purpose Display
  • MSL: -
  • No. of Outputs: 8
  • No. of Pins: 16
  • Operating Temperature Max: 85°C
  • Operating Temperature Min: -40°C
  • Output Current: 44mA
  • Output Voltage: 5.5V
  • Packaging: Cut Tape
  • SVHC: To Be Advised
  • Switching Frequency: 25MHz

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Availability: No Longer Manufactured


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Customer Reviews

Wonderful Little LED Driver Ability to serially drive up to 8 LEDs at up to 100ma with a drive voltage as low as an incredible 0.4V made this little chip a huge problem solver! I needed a way to inexpensively and selectively drive 7 LEDs with as few connections as possible (to keep the pin count down on the MCU, for both the smaller footprint and lowest cost). Six of the LEDs needed to be driven at a constant 20MA and one at around 5MA. Since the CAT4008 has only one program port (a resistor that sets the drive current level on all of the LEDs), I just used a series resistor on the 7th LED leg (530ohm). The max serial clock rate is 25MHz which, for any application I can think of, is plenty fast (~340 ns updates--though, the 400ns Channel Stagger Delay might push that out to ~700ns, unless the data can be clocked in while the Channel Stagger is happening--and it looks like it can). The only con (for me) is the relatively large supply current [~5MA] (design called for low battery drain in stand-by mode) but I got around that by driving the VDD pin with a MCU output (the LED current never passes through the VDD pin so the max load on the MCU output is 9MA [2.5MA typ]) The serial interface is easy to use. The Latch pin allows for seamless updates, and the Blank pin makes it possible to extinguish or flash LEDs without modifying the serial data (i.e. Blank the LEDs yet retain the display pattern). The only other con that I can thing of is the 5.5V upper limit on voltage applied to the LED drive outputs -- which means, for an LED with 2.0 forward voltage, an upper supply limit of around 7.5V -- which is within the range of a four cell supply, so, perhaps, no biggie (my application required a 9V supply, which required a larger 5 V regulator than would have been needed if the CAT4008 could handle such voltages--also, I could have used a 3.3V reg to drive the MCU, which would have been preferred). This is one in a series of Serial LED Drivers by ON Semi. I've only used this one, but the others bear attention: CAT4004, CAT4003, etc. January 12, 2011
  • 2015-06-11T15:21:19.941-05:00
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