CAT3649_14 Datasheet, PDF (1/13 Pages) ON Semiconductor – 6-Channel LED Driver with 32 Dimming Levels & PWM

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.
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
Compliant
Typical Applications (Note 1)
• LCD Display Backlight
• Cellular Phones
• Digital Still Cameras
• Handheld Devices
1. Typical application circuit with external components is shown in Figure 1.
http://onsemi.com
TQFN−16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
1
C1+
C1−
C2+
C2−
ADIM
LED6
LED5
LED4
(Top View)
MARKING DIAGRAM
JABA
AXXX
YWW
JABA = CAT3649HV3−GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
ORDERING INFORMATION
Device
Package
Shipping^†
CAT3649HV3−GT2 TQFN−16
(Pb−Free)
2000 /
Tape & Reel
†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
August, 2014 − Rev. 3
Publication Order Number:
CAT3649/D