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CAT3643

Catalyst Semiconductor
Part Number CAT3643
Manufacturer Catalyst Semiconductor
Description 3-Channel Ultra High Efficiency Quad-Mode TM LED Driver
Published Apr 18, 2007
Detailed Description CAT3643 3-Channel Ultra High Efficiency Quad-Mode™ LED Driver FEATURES „ High efficiency 1.33x charge pump „ Quad-mode ...
Datasheet PDF File CAT3643 PDF File

CAT3643
CAT3643

Overview
CAT3643 3-Channel Ultra High Efficiency Quad-Mode™ LED Driver FEATURES „ High efficiency 1.
33x charge pump „ Quad-mode charge pump: 1x, 1.
33x, 1.
5x, 2x „ Drives up to 3 LEDs at 32mA each „ 1-wire EZDim™ 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 „ Tiny 12-lead XQFN, 12-lead TDFN and 16-lead TQFN packages 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.
4V to 5.
5V.
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 12-lead XQFN 2.
5 x 2.
5mm with max height of 0.
4mm or in 16-lead TQFN or 12-lead TDFN 3mm x 3mm package with a max height of 0.
8mm.
The 1.
33x charge pump architecture with two fly capacitors is patent pending.
Package Marking HABF JAAE (1) (1) APPLICATION „ LCD Display Backlight „ Cellular Phones „ Digital Still Cameras „ Handheld Devices www.
DataSheet4U.
com ORDERING INFORMATION Part Number CAT3643HV2-T2 CAT3643HV3-T2 Package TDFN-12 3 x 3mm(1) TQFN-16 3 x 3mm CAT3643HL1-T2 XQFN-12 2.
5 x 2.
5mm Notes: (1) Matte-Tin Plated Finish (RoHS-compliant) (2) Quantity per reel is 2000 LB TYPICAL APPLICATION CIRCUIT 1µF 1µF VIN 2.
4V to 5.
5V CIN 1µF C1+ VIN C1- C2+ C2VOUT White LEDs VOUT COUT 1µF For Ordering Information details, see page 16.
CAT...


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