CAT3643 Datasheet, PDF (1/15 Pages) Catalyst Semiconductor – 3-Channel Ultra High Efficiency Quad-Mode TM LED Driver

CAT3643
3-Channel Ultra High
Efficiency Quad-Mode⁾ LED
Driver
Description
The CAT3643 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 current setting of all LEDs. Six different current
ratios are available via the interface.
The device is available in the 16−pad TQFN or 12−pad TDFN 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 32 mA Each
• 1−wire EZDimt LED Current Programming
• 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
• 12−pad TDFN and 16−pad TQFN Packages
• 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
TDFN−12
HV2 SUFFIX
CASE 511AN
TQFN−16
HV3 SUFFIX
CASE 510AD
MARKING DIAGRAMS
HABF
CAT3643HV2−T2
HABG
CAT3643HV2−GT2
JAAE
CAT3643HV3−T2
JAAF
CAT3643HV3−GT2
ORDERING INFORMATION
Device
Package
CAT3643HV2−T2
(Note 1)
TDFN−12
(Pb−Free)
CAT3643HV2−GT2 TDFN−12
(Note 2)
(Pb−Free)
CAT3643HV3−T2
(Note 1)
TQFN−16
(Pb−Free)
CAT3643HV3−GT2 TQFN−16
(Note 2)
(Pb−Free)
Shipping
2,000/
Tape & Reel
2,000/
Tape & Reel
2,000/
Tape & Reel
2,000/
Tape & Reel
1. Matte−Tin Plated Finish (RoHS−compliant).
2. NiPdAu Plated Finish (RoHS−compliant).
© Semiconductor Components Industries, LLC, 2010
1
May, 2010 − Rev. 6
Publication Order Number:
CAT3643/D