CAT4103
3-Channel Constant-Current
RGB LED Driver
Description
The CAT4103 is a 3−channel, linear based constant−current LED
driver designed for RGB LED control, requiring no inductor and
provides a low noise operation. LED channel currents up to 175 mA
are programmed independently via separate external resistors. Low
output voltage operation of 0.4 V at 175 mA allows for more power
efficient designs across wider supply voltage range. The three LED
pins are compatible with high voltage up to 25 V supporting
applications with long strings of LEDs.
A high−speed 4−wire 25 MHz serial interface controls each
individual channel using a shift register and latch configuration.
Output data pins allow multiple devices to be cascaded and
programmed via one serial interface with no need for external drivers
or timing considerations. The device also includes a blanking control
pin (BIN) that can be used to disable all channels independently of the
interface.
Thermal shutdown protection is incorporated in the device to
disable the LED outputs whenever the die temperature exceeds 150°C.
The device is available in a 16−lead SOIC package.
Features
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SOIC−16
V SUFFIX
CASE 751BG
PIN CONNECTIONS
GND
BIN
LIN
SIN
CIN
RSET3
RSET2
RSET1
(Top View)
1
VDD
BOUT
LOUT
SOUT
COUT
LED1
LED2
LED3
•
3 Independent Current Sinks Rated to 25 V
•
LED Current to 175 mA per Channel Set by Separate External
•
•
•
•
•
•
•
•
Resistors
High−speed 25 MHz 4−wire Serial Interface
Buffered Output Drivers to Ensure Data Integrity
Cascadable Devices
Low Dropout Current Source (0.4 V at 175 mA)
3 V to 5.5 V Logic Supply
Thermal Shutdown Protection
16−lead SOIC Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
MARKING DIAGRAM
L4A
CAT4103VB
YMXXXX
Applications
•
Multi−color, Intelligent LED, Architectural Lighting
•
High−visual Impact LED Signs and Displays
•
LCD Backlight
L = Assembly Location
4 = Lead Finish
−
NiPdAu
A = Product Revision (Fixed as “A”)
CAT4103V = Device Code
B = Leave Blank
Y = Production Year (Last Digit)
M = Production Month (1−9, A, B, C)
XXXX = Last Four Digits of Assembly Lot Number
ORDERING INFORMATION
Device
CAT4103V−GT2
(Note 1)
Package
SOIC−16
(Pb−Free)
Shipping
2,000/
Tape & Reel
1. Lead Finish NiPdAu
©
Semiconductor Components Industries, LLC, 2010
March, 2010
−
Rev. 1
1
Publication Order Number:
CAT4103/D
CAT4103
VIN
5 V to 25 V
VDD
3 V to 5.5 V
C1
1
mF
VDD
BIN
CONTROLLER
LIN
SIN
CIN
GND
RSET1
R1
RSET2
R2
RED
LED1
GREEN
LED2
BLUE
LED3
BOUT
CAT4103
LOUT
SOUT
COUT
RSET3
R3
NEXT
CAT4103
DEVICE
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
VDD Voltage
Input Voltage Range (SIN, BIN, CIN, LIN)
Output voltage range (SOUT, BOUT, COUT, LOUT)
LED1, LED2, LED3 Voltage
DC Output Current on LED1 to LED3
Storage Temperature Range
Junction Temperature Range
Lead Soldering Temperature (10 sec.)
ESD Rating: All Pins
Human Body Model
Machine Model
Rating
6
−0.3
V to VDD+0.3 V
−0.3
V to VDD+0.3 V
25
200
−55
to +160
−40
to +150
300
2000
200
Units
V
V
V
V
mA
_C
_C
_C
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameter
VDD
Voltage applied to LED1 to LED3, outputs off
Voltage applied to LED1 to LED3, outputs on
Output Current on LED1 to LED3
Ambient Temperature Range
Range
3.0 to 5.5
up to 25
up to 6 (Note 2)
2 to 175
−40
to +85
Units
V
V
V
mA
_C
2. Keeping the LEDx pin voltage below 6 V in operation is recommended to minimize thermal dissipation in the package.
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CAT4103
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(Min and Max values are over recommended operating conditions
unless specified otherwise. Typical values are at V
IN
= 5.0 V, T
AMB
= 25°C.)
Symbol
DC CHARACTERISTICS
I
DD1
I
DD2
I
DD3
I
DD4
I
LKG
R
LIN
R
BIN
V
IH
V
IL
I
IL
V
OH
V
OL
V
RSET
T
SD
T
HYS
I
LED
/I
RSET
V
UVLO
Supply Current Outputs Off
Supply Current Outputs Off
Supply Current Outputs On
Supply Current Outputs On
LED Output Leakage
LIN Pull−down Resistance
BIN Pull−up Resistance
SIN, BIN, CIN, LIN logic high level
SIN, BIN, CIN, LIN logic low level
Logic Input Leakage Current (CIN, SIN)
xOUT Logic High Output Voltage
xOUT Logic Low Output Voltage
RSETx Regulated Voltage
Thermal Shutdown
Thermal Hysteresis
RSET to LED Current Gain ratio
Undervoltage Lockout (UVLO) Threshold
100 mA LED Current
V
I
= V
DD
or GND
I
OH
=
−1
mA
I
OL
= 1 mA
V
LED
= 5 V, R
SET
= 24.9 kW
V
LED
= 5 V, R
SET
= 5.23 kW
V
LED
= 0.5 V, R
SET
= 24.9 kW
V
LED
= 0.5 V, R
SET
= 5.23 kW
V
LED
= 5 V, Outputs Off
−1
140
140
0.7x V
DD
0.3x V
DD
−5
V
CC
−
0.3 V
0.3
1.17
1.2
150
20
400
1.8
V
1.23
V
°C
°C
0
5
mA
V
180
180
2
4
2
4
5
10
5
10
1
250
250
mA
mA
mA
mA
mA
kW
kW
V
Name
Conditions
Min
Typ
Max
Units
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CAT4103
Table 4. TIMING CHARACTERISTICS
(Min and Max values are over recommended operating conditions unless specified
otherwise. Typical values are at V
IN
= 5.0 V, T
AMB
= 25°C.)
Symbol
CIN
f
cin
t
cwh
t
cwl
SIN
t
ssu
t
sh
LIN
T
lwh
t
lchd
t
lcsu
LEDn
t
ledplon
t
ledploff
t
ledpbon
t
ledpboff
t
ledr
t
ledf
SOUT
t
sr
t
sf
t
sdf
t
sdr
COUT
t
cr
t
cf
t
cdf
t
cdr
LOUT
t
lr
t
lf
t
ldf
t
ldr
BOUT
t
br
t
bf
t
bdf
t
bdr
BOUT rise time (10% to 90%)
BOUT fall time (90% to 10%)
Propagation delay time BOUT
Propagation delay time BOUT
C
L
= 15 pF
C
L
= 15 pF
BIN falling to BOUT falling
BIN rising to BOUT rising
5
5
6
8
20
20
ns
ns
ns
ns
LOUT rise time (10% to 90%)
LOUT fall time (90% to 10%)
Propagation delay time LOUT
Propagation delay time LOUT
C
L
= 15 pF
C
L
= 15 pF
LIN falling to LOUT falling
LIN rising to LOUT rising
5
5
4
5
10
10
ns
ns
ns
ns
COUT rise time (10% to 90%)
COUT fall time (90% to 10%)
Propagation delay time COUT
Propagation delay time COUT
C
L
= 15 pF
C
L
= 15 pF
CIN falling to COUT falling
CIN rising to COUT rising
5
5
4
4
10
10
ns
ns
ns
ns
SOUT rise time (10% to 90%)
SOUT fall time (90% to 10%)
Propagation delay time SOUT
Propagation delay time SOUT
C
L
= 15 pF
C
L
= 15 pF
CIN falling to SOUT falling
CIN falling to SOUT rising
5
5
6
6
18
18
ns
ns
ns
ns
Turn on Propagation delay LIN
Turn off Propagation delay LIN
Turn on Propagation delay BIN
Turn off Propagation delay BIN
LED rise time (10% to 90%)
LED fall time (90% to 10%)
LIN to LED(n) on
LIN to LED(n) off
BIN to LED(n) on
BIN to LED(n) off
Pullup resistor = 50
W
to 3.0 V
Pullup resistor = 50
W
to 3.0 V
380
130
380
130
160
140
ns
ns
ns
ns
ns
ns
LIN Pulse width
Hold time LIN to CIN
Setup time LIN to CIN
20
4
8
ns
ns
ns
Setup time SIN to CIN
Hold time SIN to CIN
4
4
ns
ns
CIN Clock Frequency
CIN Pulse Width High
CIN Pulse Width Low
18
18
25
MHz
ns
ns
Name
Conditions
Min
Typ
Max
Units
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4
CAT4103
1/f
cin
CIN
t
ssu
t
sh
t
cwl
t
cwh
SIN
t
sdf
t
sdr
SOUT
t
lwd
t
lchd
t
lcsu
LIN
Figure 2. Timing Diagram A
t
ledploff
t
ledplon
LIN
t
ledpboff
BIN
t
ledpbon
LED(n)
Figure 3. Timing Diagram B
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