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CAT4004 Datasheet(PDF) 1 Page - Catalyst Semiconductor

Part No. CAT4004
Description  4-Channel Constant Current LED Driver with EZDi TM
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Maker  CATALYST [Catalyst Semiconductor]
Homepage  http://www.catalyst-semiconductor.com
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CAT4004 Datasheet(HTML) 1 Page - Catalyst Semiconductor

 
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CAT4004
© 2007 Catalyst Semiconductor, Inc.
1
Doc. No. 5024 Rev. A
Characteristics subject to change without notice
FEATURES
Four LED current sinks with tight matching
Low Dropout Driver 130mV at 30mA
No switching noise
Shutdown current < 1μA
LED current set by external resistor
Dimming via 1-wire EZDim
TM interface
Thermal shutdown protection
RoHS Compliant
8-lead 2mm x 3mm TDFN package
APPLICATIONS
LCD Display Backlight
Cellular Phones
Digital Still Cameras
Handheld Devices
ORDERING INFORMATION
Part
Number
Package
Package
Marking
CAT4004VP2-T
3
TDFN-8
2x3mm
(1)
FT
Notes:
(1) Lead finish Matte-Tin
(2) Quantity per reel is 3000
DESCRIPTION
The CAT4004 provides four matched low dropout current
sources to drive LEDs. An external resistor on RSET sets
the current in the LED channels. Each LED channel
includes an individual control loop allowing the device to
handle a wide range of LED forward voltages while still
maintaining tight current matching.
The EN/DIM logic inputs supports device enable and a
digital dimming interface for current setting of all LEDs.
Six different current dimming ratios are available.
The device is aimed at “direct drive” battery applications.
It is required that the battery or voltage source have
enough headroom to drive the LED forward voltage and
current sink (>150mV).
The device is available in a tiny 8-lead TDFN 2mm x 3mm
package with a max height of 0.8mm.
For Ordering Information details, see page 10.
PIN CONFIGURATION
TYPICAL APPLICATION CIRCUIT
8-lead TDFN Package
(Top View)
EN/DIM 1
8
VIN
GND 2
7
RSET
LED1 3
CAT4004
6
LED4
LED2 4
5
LED3
4-Channel Constant Current LED Driver with EZDim™
CAT4004
VIN
EN/DIM
RSET
GND
LED1 LED2 LED3 LED4
RSET
3.8kΩ
One wire
programming
20mA
VIN
1µF
2.4V
to
5.5V
CIN


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