CAT3649
6-Channel LED Driver with
32 Dimming Levels & PWM
Description
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.
http://onsemi.com
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.
TQFN−16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
1
ADIM
LED6
LED5
LED4
C1+
C1−
C2+
C2−
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%
(Top View)
MARKING DIAGRAM
• Low Noise Input Ripple in All Modes
• “Zero” Current Shutdown Mode
• Soft Start and Current Limiting
• Short Circuit Protection
JABA
AXXX
YWW
• Thermal Shutdown Protection
JABA = CAT3649HV3−GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
• 3 mm x 3 mm, 16−pad TQFN Package
• This Device is Pb−Free, Halogen Free/BFR Free and is RoHS
Compliant
Typical Applications (Note 1)
ORDERING INFORMATION
• LCD Display Backlight
• Cellular Phones
†
Device
Package
Shipping
• Digital Still Cameras
CAT3649HV3−GT2
TQFN−16
(Pb−Free)
2000 /
Tape & Reel
• Handheld Devices
1. Typical application circuit with external components is shown in Figure 1.
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2014
1
Publication Order Number:
August, 2014 − Rev. 3
CAT3649/D
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