DC-DC LED Drivers | CAT3649

LED Driver, 6-Channel, with 32 Dimming Levels and PWM

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The CAT3649 is a high efficiency fractional charge pump that can drive up to six LEDs. The inclusion of a 1.33x fractional charge pump mode increases the 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 LED current can be adjusted in different ways. The full-scale LED current is set to 25 mA once the device is enabled. Analog dimming in 32 linear steps is achieved via a 1-wire pulse-dimming input (ADIM). Further adjustment of the LED current can be done by applying a pulse width modulation (PWM) signal on the PWM input. The PWM dimming control is compatible with content adaptive brightness control (CABC) for a wide range of PWM signal frequency up to 200 kHz.

The CAT3649 can be shut down by holding the ADIM or PWM input in a logic low condition for greater than 30 ms.

  • 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 6 LEDs at 25 mA Each
  • PWM Dimming 100 Hz to 200 kHz for CABC
  • 1-wire EZDimTM 32 Linear Steps (ADIM)
  • 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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CAT3649HV3-GT2

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Pb

A

H

P

TQFN-16

510AD

1

260

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2000

N

Charge Pump

2.4

5.5

6

25

1000

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