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© Semiconductor Components Industries, LLC, 2010
May, 2010 − Rev. 2
1 Publication Order Number:
CAT3647/D
CAT3647
3-Channel Ultra High
Efficiency Quad-Mode
)
LED
Driver with 32 Dimming
Levels
Description
The CAT3647 is a high efficiency quad−mode fractional charge
pump that can drive up to three 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.
The device is available in the tiny 16−pad TQFN 3 mm x 3 mm
package with a max height of 0.8 mm.
ON Semiconductor’s Quad−Mode
®
1.33x, charge pump switching
architecture is patented.
Features
• High Efficiency 1.33x Charge Pump
• Quad−mode Charge Pump: 1x, 1.33x, 1.5x, 2x
• Drives up to 3 LEDs at 30 mA Each
• 1−wire EZDimt 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
• 16−pad TQFN Package
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• LCD Display Backlight
• Cellular Phones
• Digital Still Cameras
• Handheld Devices
http://onsemi.com
TQFN−16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
MARKING DIAGRAM
Device Package Shipping
ORDERING INFORMATION
CAT3647HV3−GT2
(Note 1)
TQFN−16
(Pb−Free)
2,000/
Tape & Reel
1. NiPdAu Plated Finish (RoHS−compliant).
LED1
GND
NC
NC
C2−
C2+
C1−
C1+
LED2
LED3
NC
RSET
EN/DIM
VOUT
NC
VIN
1
(Top View)
JAAP
AXXX
YWW
JAAP = CAT3647HV3−GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
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