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

Numéro de référence CAT3647
Description 3-Channel Ultra High Efficiency Quad-Mode LED Driver
Fabricant Catalyst Semiconductor 
Logo Catalyst Semiconductor 





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CAT3647 fiche technique
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CAT3647
3-Channel Ultra High Efficiency Quad-Mode™
LED Driver with 32 Dimming Levels
FEATURES
„ High efficiency 1.33x charge pump
„ Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x
„ Drives up to 3 LEDs at 30mA each
„ 1-wire EZDim™ 32 linear steps
„ 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
„ RoHS-compliant 16-pad TQFN package
APPLICATION
„ LCD Display Backlight
„ Cellular Phones
„ Digital Still Cameras
„ Handheld Devices
ORDERING INFORMATION
Part Number
CAT3647HV3-GT2
Package
TQFN-16
3mm x 3mm(1)
Notes:
(1) NiPdAu Plated Finish (RoHS-compliant)
(2) Quantity per reel is 2000
Marking
JAAP
PIN CONFIGURATION
(Top View)
DESCRIPTION
The CAT3647 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 setting the current in all
the LED channels. The 1-wire pulse-dimming interface
supports 32 linear steps from full-scale down to zero
current.
The device is available in the tiny 16-pad TQFN 3mm
x 3mm package with a max height of 0.8mm.
Catalyst Semiconductor’s Quad-Mode™ 1.33x,
charge pump switching architecture is patented.
TYPICAL APPLICATION CIRCUIT
1µF 1µF
16 15 14 13
LED2 1
12 C2-
LED3 2
11 C2+
NC 3
10 C1-
RSET 4
9 C1+
5678
VIN
2.4V
to
5.5V
CIN
1µF
1-Wire
EZDimTM
Programming
3.74k
C1+
VIN
C1- C2+
C2-
VOUT
CAT3647
EN/DIM
RSET
GND
LED1
LED2
LED3
VOUT
COUT
1µF
20mA
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-5030 Rev. A

PagesPages 14
Télécharger [ CAT3647 ]


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