Linear LED Drivers | CAT3637

LED Driver, 6-Channel

Obsolete

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The CAT3637 is a high efficiency fractional charge pump that can drive up to six LEDs programmable by a 1-wire digital interface. The inclusion of a 1.33x fractional charge pump mode increases device efficiency by up to 10% over traditional 1.5x charge pumps with no added external capacitors.

Low noise input ripple is achieved by operating at a constant switching frequency which allows the use of small external ceramic capacitors. The multi-fractional charge pump supports a wide range of input voltages from 2.5 V to 5.5 V.

The EN/SET logic input functions as a chip enable and a digital programming interface for setting the current in the LED channels. The 1-wire pulse-programming interface supports 15 linear steps from zero current to 30mA full-brightness in 2mA steps.

  • LCD Display Backlight

  • Mobile Phones
  • Digital Still Cameras

  • High efficiency 1.33x charge pump
  • Quad-Mode charge pump: 1x, 1.33x, 1.5x, 2x
  • Drives 6 LEDs between 30 mA and 0 mA each
  • 1-wire EZDim™ interface with 2mA step
  • Power efficiency up to 92%
  • Low noise input ripple in all modes
  • 'Zero' current shutdown mode
  • Soft start and current limiting
  • Short circuit protection
  • Thermal shutdown protection

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LEDs in Series, Max #

LEDs in Parallel, Max #

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CAT3637HV3-GT2

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Obsolete

CAD Model

Pb

A

H

P

TQFN-16

510AD

1

260

REEL

2000

N

5.5

180

1

6

Price N/A

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