Document
CAT4008
8-Channel Constant Current LED Driver
FEATURES
8 Constant current-sink channels Serial interface up to 25MHz clock frequency 3V to 5.5V logic supply LED www.DataSheet4U.com current range from 2mA to 100mA LED current set by external RSET resistor 300mV LED dropout at 30mA Thermal shutdown protection Available in RoHS-compliant 16-lead SOIC (150 and 300mil wide), and TSSOP packages
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 0.4V (for 2 to 100mA LED current) allows for more power efficient designs. A high-speed 4-wire serial interface of up to 25MHz 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 16-lead SOIC (narrow and wide), and TSSOP packages.
APPLICATIONS
Billboard Display Marquee Display Instrument Display General Purpose Display
For Ordering Information details, see page 13.
TYPICAL APPLICATION CIRCUIT
VIN 3V to 5.5V 1µF VDD
CONTROLLER
20mA LED1 LED2 LED8
BLANK LATCH SIN CLK GND
CAT4008
SOUT RSET
to next device
3.09kΩ
© Catalyst Semiconductor, Inc. Characteristics subject to change without notice
1
Doc. No. MD-5034 Rev. A
CAT4008
ORDERING INFORMATION
Part Number CAT4008W-T2 CAT4008V-T1 CAT4008Y-T2 Package SOIC16 (N) SOIC16 (W) TSSOP16
(1) (1)(2)
Quantity per Reel 2000 1000 2000
Package Marking CAT4008W CAT4008V CAT4008Y
(1)(2)
PIN CONFIGURATION
16-Lead SOIC (W, V), TSSOP (Y)
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GND SIN SCLK XLAT LED1 LED2 LED3 LED4
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VDD RSET SOUT BLANK LED8 LED7 LED6 LED5
Notes: (1) (2) Matte-Tin Plated Finish (RoHS-compliant). Contact factory for package availability. 2
© Catalyst Semiconductor, Inc. Characteristics subject to change without notice
Doc. No. MD-5034 Rev. A
CAT4008
ABSOLUTE MAXIMUM RATINGS
Parameter VDD 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 (10sec.)
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Rating 6 -0.3V to VDD+0.3V 6 150 -55 to +160 -40 to +150 300
Units V V V mA °C °C °C
RECOMMENDED OPERATING CONDITIONS
Parameter VDD 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
ELECTRICAL OPERATING CHARACTERISTICS
DC CHARACTERISTICS VDD = 5.0V, TAMB = 25 ºC, over recommended operating conditions unless specified otherwise. Symbol
ILED-ACC
Name
LED Current (any channel)
Conditions
VLED = 1V, RSET = 3.08kΩ VLED = 1V, RSET = 1.54kΩ VLED = 1V, RSET = 769Ω VLED = 1V, RSET = 3.08kΩ VLED = 1V, RSET = 1.54kΩ VLED = 1V, RSET = 769Ω VDD within 4.5V and 5.5V LED current 30mA VLED within 1V and 3V LED current 30mA RSET = 3.08kΩ RSET = 769Ω RSET = 3.08kΩ RSET = 769Ω VLED = 5V, outputs off
Min
18 36
Typ
20 40 80 ±1.5 ±1.5 ±2.0 ±0.1 ±0.05 2 5.5 2.5 6.2
Max
22 44
Units
mA
ILED-MAT ΔIVDD ΔIVLED IDDOFF IDDON ILKG RLATCH RBLANK VIH VIL VHYS IIL VOH VOL VRSET TSD THYST
LED Current Matching (ILED - ILEDAVR) / ILEDAVR LED current regulation vs. VDD LED current regulation vs. VLED Supply Current (all outputs off) Supply Current (all outputs on) 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
-6.0
+6.0
% %/V %/V
8 9 1 300 300 0.3xVDD
mA mA mA mA µA kΩ kΩ V V V
-1 100 100 0.7xVDD
180 180
0.1xVDD VI = VDD or GND IOH = -1mA IOL = 1mA BLANK high, outputs off -5 VCC-0.3V 1.17 1.20 160 20 0 5 0.3 1.23
µA V V ºC ºC
© Catalyst Semiconductor, Inc. Characteristics subject to change without notice
3
Doc. No. MD-5034 Rev. A
CAT4008
TIMING CHARACTERISTICS For 3.0V ≤ VDD ≤ 5.5V, TAMB = 25 ºC, unless specified otherwise. Symbol CLK fclk tcwh tcwl SIN tssu
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Name CLK Clock Frequency CLK Pulse Width High CLK Pulse Width Low Setup time SIN to CLK Hold time SIN to CLK LATCH Pulse width Hold time LATCH to CLK Setup time LATCH to CLK 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%) SOUT rise time (10% to 90%) SOUT fall time (90% to 10%).