LED Driver, 4-Channel

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Overview

The CAT3644 is a high efficiency fractional charge pump that can drive up to four LEDs programmable by a one 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/DIM logic input functions as a chip enable and a digital dimming interface for current setting of all LEDs. Six different current ratios are available via the interface.

  • 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 up to 4 LEDs at 25 mA each
  • 1-wire EZDim™ LED current programming
  • 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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Reference Price

CAT3644HV3-GT2

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Obsolete

CAD Model

Pb

A

H

P

TQFN-16

1

260

REEL

2000

N

5.5

100

1

4

Price N/A

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