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.
http://onsemi.com
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1
SOIC−16
W SUFFIX
SOIC−16
V SUFFIX
CASE 751BG
CASE 751BH
TSSOP−16
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 16−lead SOIC (narrow and wide), and
TSSOP packages.
Y SUFFIX
CASE 948AN
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PIN CONNECTIONS
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Features
GND
VDD
• 8 Constant Current−sink Channels
• Serial Interface up to 25 MHz Clock Frequency
• 3 V to 5.5 V Logic Supply
SIN
SCLK
XLAT
LED1
LED2
LED3
LED4
RSET
SOUT
BLANK
LED8
LED7
LED6
LED5
• LED Current Range from 2 mA to 100 mA
• LED Current set by External RSET Resistor
• 300 mV LED Dropout at 30 mA
16−Lead SOIC (W, V), TSSOP (Y)
• Thermal Shutdown Protection
(Top View)
• Available in 16−lead SOIC (150 and 300 mil wide), and TSSOP
Packages
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 13 of this data sheet.
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
MARKING DIAGRAMS
• Billboard Display
• Marquee Display
• Instrument Display
• General Purpose Display
A = Assembly Location
3 = Lead Finish − Matte−Tin
B = Product Revision (Fixed as “B”)
CAT4008W, CAT4008V, 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
A3B
CAT4008WZ
YMXXXX
AB
4008YZZ
3YMXXX
A3B
CAT4008VZ
YMXXXX
CAT4008W−T2
CAT4008Y−T2 or
CAT4008Y−GT2
CAT4008V−T1
©
Semiconductor Components Industries, LLC, 2010
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Publication Order Number:
March, 2010 − Rev. 2
CAT4008/D