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DC-DC LED Drivers | CAT3648

LED Driver, 4-Channel with 32 Dimming Levels

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Overview

The CAT3648 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 2.4 V to 5.5 V.

The EN/DIM logic input functions as a chip enable and a digital dimming interface for setting the current in all the LED channels. The 1-wire pulse-dimming interface supports 32 linear steps from full-scale down to zero current.

  • LCD Display Backlight

  • Mobile Phones
  • Digital Still Camera

  • 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™ 32 linear steps
  • 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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CAT3648HV3-GT2

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CAD Model

Pb

A

H

P

TQFN-16

510AD

1

260

REEL

2000

N

Charge Pump

2.5

5.5

6

100

1000

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Reliability Data

Die Related Summary Data

Device: CAT3648HV3-GT2

Equivalent to wafer fab process: CMOS SUB

Product Technology

Product Technology

Equivalent Device-Hours

MTBF/MTTF in Hours

FITS

CMOS SUB

2

920154574

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Re-calculate Data

Data is based on the following assumptions.

Note: The temperature and confidence level may be adjusted to your requirements.

Disclaimer: A reliability FIT rate calculated using this tool shall not be used for any functional safety purpose. In case a raw FIT rate needs to be estimated for a component which is targeted to be used in a safety critical application (i.e. compliant to ISO 26262 standard) it should be calculated according to generic safety standards (IEC62380, IEC61709, SN29500, FIDES, etc.)

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