CAT4004_08 Datasheet, PDF (1/11 Pages) Catalyst Semiconductor – 4-Channel Constant Current LED Driver with EZDim™

CAT4004
4-Channel Constant Current LED Driver with EZDim™
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
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.
ORDERING INFORMATION
Part Number Package
CAT4004VP2-T3 TDFN-8 ⁽¹⁾
CAT4004VP2-GT3 TDFN-8 ⁽²⁾
Quantity
per Reel
3000
3000
Package
Marking
FT
HA
Notes: (1) Matte-Tin Plated Finish (RoHS-compliant).
(2) NiPdAu Plated Finish (RoHS-compliant).
For Ordering Information details, see page 10.
PIN CONFIGURATION
8-lead TDFN Package
(Top View)
EN/DIM 1
GND 2
LED1 3
LED2 4
CAT4004
8 VIN
7 RSET
6 LED4
5 LED3
TYPICAL APPLICATION CIRCUIT
V_IN
2.4V
to
C_IN
5.5V
1µF
20mA
LED1 LED2 LED3 LED4
One wire
programming
RSET
3.8kΩ
VIN
EN/DIM
RSET
CAT4004
GND
© Catalyst Semiconductor, Inc.
1
Characteristics subject to change without notice
Doc. No. MD-5024 Rev. B