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CAT3644 Datasheet, PDF (1/14 Pages) Catalyst Semiconductor – 4-Channel Ultra High Efficiency Quad-Mode TM LED Driver | |||
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CAT3644
4-Channel Ultra High
Efficiency Quad-Mode) LED
Driver
Description
The CAT3644 is a high efficiency QuadâMode® 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 multiâfractional 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 current setting of all LEDs. Six different current
ratios are available via the interface.
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 4 LEDs at 25 mA Each
⢠1âwire EZDimt LED Current Programming
⢠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
⢠3 mm x 3 mm, 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+
LED4
C1â
RSET
C1+
(Top View)
MARKING DIAGRAMS
JAAG
AXXX
YWW
JAAH
AXXX
YWW
JAAD = CAT3644HV3âT2
JAAH = CAT3644HV3âGT2
A = Assembly Location
XXX = Last Three Digits of Assembly Lot Number
Y = Production Year (Last Digit)
WW = Production Week (Two Digits)
ORDERING INFORMATION
Device
CAT3644HV3âT2
(Note 1)
CAT3644HV3âGT2
(Note 2)
Package
TQFNâ16
(PbâFree)
TQFNâ16
(PbâFree)
Shipping
2,000/
Tape & Reel
1. MatteâTin Plated Finish (RoHSâcompliant).
2. NiPdAu Plated Finish (RoHSâcompliant).
© Semiconductor Components Industries, LLC, 2010
1
April, 2010 â Rev. 6
Publication Order Number:
CAT3644/D
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