CAT4109V-GT2 Datasheet, PDF (1/11 Pages) ON Semiconductor – 3-Channel Constant-Current RGB LED Driver with Individual PWM Dimming

CAT4109
3-Channel Constant-Current RGB LED Driver with
Individual PWM Dimming
FEATURES
„ 3 independent current sinks up to 175mA
rated 25V
„ LED Current set by external low power
control resistors
„ Individual PWM control per channel
„ Low dropout current source (0.4V at 175mA)
„ Output Enable input for dimming
„ “Zero” current shutdown mode
„ 3V to 5.5V logic supply
„ Thermal shutdown protection
„ RoHS-compliant 16-lead SOIC package
APPLICATIONS
„ Multi-color LED, Architectural Lighting
„ LED signs and displays
„ LCD backlight
ORDERING INFORMATION
Part
Number
Package
Quantity
per Reel
CAT4109V-GT2 SOIC-16* 2,000
* Lead Finish NiPdAu
Package
Marking
CAT4109V
DESCRIPTION
The CAT4109 is a 3-channel constant-current LED driver,
requiring no inductor. LED channel currents up to 175mA
are programmed independently via separate external
resistors. Low output voltage operation of 0.4V at 175mA
allows for more power efficient designs across wider
supply voltage range. The three LED pins are compatible
with high voltage up to 25V supporting applications with
long strings of LEDs.
Three independent control inputs PWM1, PWM2, PWM3,
control respectivelly LED1, LED2, LED3 channels. The
device also includes an output enable (OE) control pin to
disable all three channels independently of the PWMx
input states.
Thermal shutdown protection is incorporated in the device
to disable the LED outputs whenever the die temperature
exceeds 150ºC.
The device is available in a 16-lead SOIC package.
PIN CONFIGURATION
16-Lead SOIC (W)
Top View
PGND
1
GND
2
PWM3
3
PWM2
4
PWM1
5
RSET3
6
RSET2
7
RSET1
8
16
VDD
15
OE
14
NC
13
NC
12
NC
11
LED1
10
LED2
9
LED3
TYPICAL APPLICATION CIRCUIT
VIN
5V to 25V
VDD
3V to 5.5V
CONTROLLER
C1
1µF
RED GREEN BLUE
VDD LED1 LED2
OE
PWM1
PWM2
PWM3
CAT4109
LED3
RSET1
RSET2
RSET3 _GND
R1 R2 R3
PGND
© 2009 SCILLC. All rights reserved.
1
Characteristics subject to change without notice
Doc. No. MD-5042, Rev. A