CAT3649 LED Driver, 6-Channel, with 32 Dimming Levels and PWM
●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.
●ON Semiconductor’s 1.33x charge pump switching architecture is
patented.
■Features
●High Efficiency 1.33x Charge Pump
●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 EZDim 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
●3 mm x 3 mm, 16−pad TQFN Package
●This Device is Pb−Free, Halogen Free/BFR Free and is RoHS
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Datasheet |
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Please see the document for details |
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TQFN−16 |
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English Chinese Chinese and English Japanese |
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August, 2014 |
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Rev. 3 |
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CAT3649/D |
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375 KB |
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