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CAT3649
6-Channel Quad-Mode ) LED
Driver with 32 Dimming
Levels & PWM
Description
The CAT3649 is a high efficiency Quad ? Mode ? 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
http://onsemi.com
TQFN ? 16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
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 Quad ? Mode 1.33x charge pump switching
architecture is patented.
C1+
C1 ?
C2+
C2 ?
1
ADIM
LED6
LED5
LED4
Features
? 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 EZDim t 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.
(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 2,000 /
(Pb ? Free) 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, 2010
November, 2010 ? Rev. 2
1
Publication Order Number:
CAT3649/D
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