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Linear LED Drivers | CAT3643

LED Driver, 3-Channel

Obsolete

Datasheet

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Overview

The CAT3643 is a high efficiency fractional charge pump that can drive up to three 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 2.4 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 3 LEDs at 32 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

CAT3643HV2-GT2

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Obsolete

CAD Model

Pb

A

H

P

TDFN-12

511AN

1

260

REEL

2000

N

5.5

90

1

3

Price N/A

More Details

CAT3643HV3-GT2

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Obsolete

CAD Model

Pb

A

H

P

TQFN-16

510AD

1

260

REEL

2000

N

5.5

90

1

3

Price N/A

More Details

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