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CAT3603HV22

Description
3-Channel LED Driver in 3x3mm Package
File Size499KB,12 Pages
ManufacturerCatalyst
Websitehttp://www.catalyst-semiconductor.com/
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CAT3603HV22 Overview

3-Channel LED Driver in 3x3mm Package

CAT3603
3-Channel LED Driver in 3x3mm Package
FEATURES
Drives up to 3 LEDs
Current setting resistor
Compatible with supply voltage of 3V to 5.5V
Power efficiency up to 91%
Output Current up to 30mA per LED
Fractional pump 1x/1.5x
Low noise input ripple
Fixed High Frequency Operation 1MHz
“Zero” Current Shutdown Mode
Soft start and current limiting
Short circuit protection
12-lead TDFN 3mm x 3mm package
DESCRIPTION
The CAT3603 is a charge pump LED driver
operating in either 1x (LDO) mode or 1.5x fractional
mode regulating current through each of the 3 LED
pins. Operation at a constant switching frequency of
1MHz allows the use of very small value ceramic
capacitors.
The CAT3603 drives 3 white LEDs in parallel and
provides tightly matched regulated current to achieve
uniform brightness in LCD backlighting applications.
An external resistor, RSET, controls the output
current level. The device can deliver up to 30mA over
an input voltage supply range from 3V to 5.5V,
making it ideal for battery-powered applications
LED dimming can be accomplished using several
methods; using a DC voltage to set the RSET pin
current, applying a PWM signal on the EN pin, or
adding a switched resistor in parallel with RSET. The
EN input pin allows the device to be placed in power-
down mode with “near-zero” quiescent current.
The device is available in the tiny 12-lead thin DFN
3mm x 3mm package with a max height of 0.8mm.
APPLICATION
LCD Display Backlight
Cellular Phones
Digital Still Cameras
Handheld Devices
ORDERING INFORMATION
Part
Number
Package
Quantity Package
per Reel Marking
2000
HABB
CAT3603HV2 TDFN-12 3x3
Green*
* Lead Finish Matte-Tin
For Ordering Information details, see page 11.
PIN CONFIGURATION
12-lead TDFN 3mm (Top view)
TYPICAL APPLICATION CIRCUIT
Note:
Unused LED channels must be connected to VOUT.
© 2006 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 5017 Rev. C

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