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Catalyst Semiconductor - 3-Channel Ultra High Efficiency Quad-Mode TM LED Driver

Numéro de référence CAT3643
Description 3-Channel Ultra High Efficiency Quad-Mode TM LED Driver
Fabricant Catalyst Semiconductor 
Logo Catalyst Semiconductor 





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CAT3643 fiche technique
CAT3643
3-Channel Ultra High Efficiency Quad-Mode™
LED Driver
FEATURES
DESCRIPTION
„ 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
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.
„ “Zero” current shutdown mode
„ Soft start and current limiting
„ Short circuit protection
„ Thermal shutdown protection
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.
„ Tiny 12-lead XQFN, 12-lead TDFN and 16-lead
TQFN packages
The EN/DIM logic input functions as a chip enable and
a digital dimming interface for current setting of all
APPLICATION
LEDs. Six different current ratios are available via the
interface.
„ LCD Display Backlight
www.DataSheet4U.com
„ Cellular Phones
„ Digital Still Cameras
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
„ Handheld Devices
height of 0.8mm.
ORDERING INFORMATION
Part
Package
Number
Package
Marking
CAT3643HV2-T2 TDFN-12 3 x 3mm(1) HABF
CAT3643HV3-T2 TQFN-16 3 x 3mm(1) JAAE
CAT3643HL1-T2 XQFN-12 2.5 x 2.5mm(1) LB
Notes:
(1) Matte-Tin Plated Finish (RoHS-compliant)
(2) Quantity per reel is 2000
For Ordering Information details, see page 16.
The 1.33x charge pump architecture with two fly
capacitors is patent pending.
TYPICAL APPLICATION CIRCUIT
1µF 1µF
VIN
2.4V
to
5.5V
CIN
1µF
1-Wire
EZDimTM
Programming
3.8k
C1+
VIN
C1- C2+
C2-
VOUT
White LEDs
CAT3643
EN/DIM
RSET
GND
LED1
LED2
LED3
VOUT
COUT
1µF
20mA
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 5022, Rev. B

PagesPages 17
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