CAT4008
8-Channel Constant Current
LED Driver
Description
The CAT4008 is an 8 channel constant current driver for LED
billboard and other general display applications. LED channel
currents are programmed together via an external RSET resistor. Low
output voltage operation on the LED channels as low as 0.4 V (for 2 to
100 mA LED current) allows for more power efficient designs.
A high−speed 4−wire serial interface of up to 25 MHz clock
frequency controls each individual channel using a shift register and
latch configuration. A serial output data pin (SOUT) allows multiple
devices to be cascaded and programmed via one serial interface. The
device also includes a blanking control pin (BLANK) 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 if the die temperature exceeds a set limit.
The device is available in the TSSOP package.
Features
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MARKING
DIAGRAM
AB
4008YZZ
3YMXXX
1
TSSOP−16
Y SUFFIX
CASE 948AN
CAT4008Y−T2
A = Assembly Location
3 = Lead Finish − Matte−Tin
B = Product Revision (Fixed as “B”)
4008Y = Device Code
Z or ZZ = Leave Blank
Y = Production Year (Last Digit)
M = Production Month (1-9, A, B, C)
XXX or XXXX = Last Three of Four Digits of
XXX or XXXX =
Assembly Lot Number
•
•
•
•
•
•
•
•
8 Constant Current−sink Channels
Serial Interface up to 25 MHz Clock Frequency
3 V to 5.5 V Logic Supply
LED Current Range from 2 mA to 100 mA
LED Current set by External RSET Resistor
300 mV LED Dropout at 30 mA
Thermal Shutdown Protection
Available in 16−lead SOIC (150 and 300 mil wide), and TSSOP
Packages
•
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
PIN CONNECTIONS
1
GND
SIN
SCLK
XLAT
LED1
LED2
LED3
LED4
VDD
RSET
SOUT
BLANK
LED8
LED7
LED6
LED5
•
•
•
•
Billboard Display
Marquee Display
Instrument Display
General Purpose Display
16−Lead TSSOP (Y)
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
©
Semiconductor Components Industries, LLC, 2015
1
July, 2015 − Rev. 3
Publication Order Number:
CAT4008/D
CAT4008
VIN
3 V to
5.5 V
1
mF
VDD LED1 LED2
LED8
20 mA
CONTROLLER
BLANK
LATCH
SIN
CLK
GND
RSET
3.09 kW
CAT4008
SOUT
to next
device
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameter
V
DD
Supply Voltage
Logic input/output voltage (SIN, SOUT, CLK, BLANK, LATCH)
LEDn voltage
DC output current on LED1 to LED8
Storage Temperature Range
Junction Temperature Range
Lead Soldering Temperature (10 sec.)
Rating
6
−0.3 V to V
DD
+0.3 V
6
150
−55 to +160
−40 to +150
300
Units
V
V
V
mA
_C
_C
_C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
Table 2. RECOMMENDED OPERATING CONDITIONS
Parameter
V
DD
Voltage applied to LED1 to LED8
LED current RSET control range
Ambient Temperature Range
Range
3.0 to 5.5
0.4 to 5.5
up to 100
−40 to +85
Units
V
V
mA
_C
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CAT4008
Table 3. ELECTRICAL OPERATING CHARACTERISTICS
(V
DD
= 5.0 V, T
AMB
= 25°C, over recommended operating conditions unless specified otherwise.)
Symbol
DC CHARACTERISTICS
I
LED−ACC
LED Current (any channel)
V
LED
= 1 V, R
SET
= 3.08 kW
V
LED
= 1 V, R
SET
= 1.54 kW
V
LED
= 1 V, R
SET
= 769
W
I
LED−MAT
LED Current Matching
(I
LED
− I
LEDAVR
) / I
LEDAVR
V
LED
= 1 V, R
SET
= 3.08 kW
V
LED
= 1 V, R
SET
= 1.54 kW
V
LED
= 1 V, R
SET
= 769
W
ΔI
VDD
ΔI
VLED
I
DDOFF
LED current regulation vs. V
DD
LED current regulation vs. V
LED
Supply Current (all outputs off)
V
DD
within 4.5 V and 5.5 V
LED current 30 mA
V
LED
within 1 V and 3 V
LED current 30 mA
R
SET
= 3.08 kW
R
SET
= 769
W
I
DDON
Supply Current (all outputs on)
R
SET
= 3.08 kW
R
SET
= 769
W
I
LKG
R
LATCH
R
BLANK
V
IH
V
IL
V
HYS
I
IL
V
OH
V
OL
V
RSET
T
SD
T
HYST
LEDn output Leakage
LATCH Pull−down Resistance
BLANK Pull−up Resistance
Logic high input voltage
Logic low input voltage
Logic input hysteresis voltage
Logic Input leakage current
(CLK, SIN)
SOUT logic high output voltage
SOUT logic low output voltage
RSET Regulated Voltage
Thermal Shutdown
Thermal Hysteresis
V
I
= V
DD
or GND
I
OH
= −1 mA
I
OL
= 1 mA
BLANK high, outputs off
−5
V
CC
−0.3 V
0.3
1.17
1.20
160
20
1.23
V
°C
°C
V
LED
= 5 V, outputs off
−1
100
100
0.7xV
DD
0.3xV
DD
0.1xV
DD
0
5
V
mA
V
180
180
−6.0
18
36
20
40
80
±1.5
±1.5
±2.0
±0.1
±0.05
2
5.5
2.5
6.2
1
300
300
mA
kW
kW
V
9
mA
8
%/V
%/V
mA
+6.0
%
22
44
mA
Name
Conditions
Min
Typ
Max
Units
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CAT4008
Table 4. TIMING CHARACTERISTICS
(For 3.0 V
≤
V
DD
≤
5.5 V, T
AMB
= 25°C, unless specified otherwise.)
Symbol
CLK
f
clk
t
cwh
t
cwl
SIN
t
ssu
t
sh
LATCH
t
lwh
T
lh
T
lsu
LEDn
t
ld
t
ls
t
lst
t
bd
t
lr
t
lf
LED1 Propagation delay
LED Propagation delay stagger
LED Propagation delay stagger total
BLANK Propagation delay
LED rise time (10% to 90%)
LED fall time (90% to 10%)
LATCH to LED1 off/on
LED(n) to LED(n+1)
LED1 to LED8
BLANK to LED(n) off/on
Pull−up resistor = 50
W
to 3.0 V
Pull−up resistor = 50
W
to 3.0 V
40
17
120
60
40
30
300
200
250
300
40
ns
ns
ns
ns
ns
ns
LATCH Pulse width
Hold time LATCH to CLK
Setup time LATCH to CLK
Channel Stagger Delay
20
4
400
ns
ns
ns
Setup time SIN to CLK
Hold time SIN to CLK
4
4
ns
ns
CLK Clock Frequency
CLK Pulse Width High
CLK Pulse Width Low
20
20
25
MHz
ns
ns
Name
Conditions
Min
(Note 1)
Typ
(Note 2)
Max
(Note 1)
Units
SOUT
t
or
t
of
t
od
SOUT rise time (10% to 90%)
SOUT fall time (90% to 10%)
Propagation delay time SOUT
C
L
= 15 pF
C
L
= 15 pF
CLK to SOUT
8
5
5
15
25
ns
ns
ns
1. All min and max values are guaranteed by design.
2. V
DD
= 5 V, LED current 30 mA.
VDD
1
mF
VDD
LED1
CONTROLLER
BLANK
LATCH
SIN
CLK
RSET
RSET
GND
CAT4008
Rp
50
W
Rp
LED8
SOUT
50
W
V1
Cl
15 pF
3V
Figure 2. Test Circuit for AC Characteristics
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CAT4008
1/f
clk
CLK
t
ssu
SIN
t
od
SOUT
t
lh
LATCH
t
lwh
t
lsu
t
sh
t
cwl
t
cwh
Figure 3. Serial Input Timing Diagram
t
ld
LATCH
t
bd
BLANK
t
ls
LED1
LED2
t
lst
= 7 t
ls
LED8
Figure 4. LED Output Timing Diagram
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