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CAT3648
4-Channel Ultra High
Efficiency Quad-Mode ) LED
Driver with 32 Dimming
Levels
Description
The CAT3648 is a high efficiency quad ? mode fractional charge
pump that can drive up to four 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 2.5 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 LED channels. The
http://onsemi.com
TQFN ? 16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
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.
LED2
LED3
LED4
RSET
1
C2 ?
C2+
C1 ?
C1+
Features
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High Efficiency 1.33x Charge Pump
Quad ? mode Charge Pump: 1x, 1.33x, 1.5x, 2x
Drives up to 4 LEDs at 25 mA Each
1 ? wire EZDim t 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
3 mm x 3 mm, 16 ? pad TQFN Package
These Devices are Pb ? Free, Halogen Free/BFR Free and are RoHS
Compliant
(Top View)
MARKING DIAGRAM
JAAN
AXXX
YWW
JAAN = CAT3648HV3 ? GT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
Applications
ORDERING INFORMATION
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LCD Display Backlight
Cellular Phones
Digital Still Cameras
Handheld Devices
Device Package Shipping
CAT3648HV3 ? GT2 TQFN ? 16 2,000/
(Note 1) (Pb ? Free) Tape & Reel
1. NiPdAu Plated Finish (RoHS ? compliant).
? Semiconductor Components Industries, LLC, 2010
May, 2010 ? Rev. 2
1
Publication Order Number:
CAT3648/D
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