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CAT3647 Datasheet, PDF (1/14 Pages) Catalyst Semiconductor – 3-Channel Ultra High Efficiency Quad-Mode™ LED Driver with 32 Dimming Levels | |||
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CAT3647
3-Channel Ultra High
Efficiency Quad-Mode) LED
Driver with 32 Dimming
Levels
Description
The CAT3647 is a high efficiency quadâmode 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 multiâfractional 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
1âwire pulseâdimming interface supports 32 linear steps from
fullâscale down to zero current.
The device is available in the tiny 16âpad TQFN 3 mm x 3 mm
package with a max height of 0.8 mm.
ON Semiconductorâs QuadâMode® 1.33x, charge pump switching
architecture is patented.
Features
⢠High Efficiency 1.33x Charge Pump
⢠Quadâmode Charge Pump: 1x, 1.33x, 1.5x, 2x
⢠Drives up to 3 LEDs at 30 mA Each
⢠1âwire EZDimt 32 Linear Steps
⢠Power Efficiency up to 92%
⢠Low Noise Input Ripple in All Modes
⢠âZeroâ Current Shutdown Mode
⢠Soft Start and Current Limiting
⢠Short Circuit Protection
⢠Thermal Shutdown Protection
⢠16âpad TQFN Package
⢠These Devices are PbâFree, Halogen Free/BFR Free and are RoHS
Compliant
Applications
⢠LCD Display Backlight
⢠Cellular Phones
⢠Digital Still Cameras
⢠Handheld Devices
http://onsemi.com
TQFNâ16
HV3 SUFFIX
CASE 510AD
PIN CONNECTIONS
1
LED2
C2â
LED3
C2+
NC
C1â
RSET
C1+
(Top View)
MARKING DIAGRAM
JAAP
AXXX
YWW
JAAP = CAT3647HV3âGT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
ORDERING INFORMATION
Device
CAT3647HV3âGT2
(Note 1)
Package
TQFNâ16
(PbâFree)
Shipping
2,000/
Tape & Reel
1. NiPdAu Plated Finish (RoHSâcompliant).
© Semiconductor Components Industries, LLC, 2010
1
May, 2010 â Rev. 2
Publication Order Number:
CAT3647/D
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