CAT4008W-T2

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 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) 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.) 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 tsh LATCH tlwh Tlh Tlsu LEDn tld tls tlst tbd tlr tlf SOUT tor tof tod SOUT rise time (10% to 90%) SOUT fall time (90% to 10%) Propagation delay time SOUT CL = 15pF CL = 15pF CLK to SOUT 8 5 5 15 25 ns ns ns 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 = 50Ω to 3.0V Pull-up resistor = 50Ω to 3.0V 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 (1) Typ (2) Max (1) Units TEST CIRCUIT FOR AC CHARACTERISTICS 1µF VDD VDD LED1 Rp 50Ω CONTROLLER BLANK LATCH SIN CLK RSET RSET GND SOUT Cl 15pF CAT4008 LED8 Rp 50Ω V1 3V Notes: (1) All min and max values are guaranteed by design. (2) VDD = 5V, LED current 30mA. Doc. No. MD-5034 Rev. A 4 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT4008 1/fclk CLK tssu SIN tod SOUT tlh LATCH tlwh tlsu tsh tcwl tcwh Figure 1. Serial Input Timing Diagram tld LATCH tbd BLANK tls LED1 LED2 tlst = 7 tls LED8 Figure 2. LED Output Timing Diagram © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 5 Doc. No. MD-5034 Rev. A CAT4008 TYPICAL PERFORMANCE CHARACTERISTICS VDD = 5.0V, LED current 30mA, all LEDs On, TAMB = 25°C unless otherwise specified. LED Current vs. LED Pin Voltage 70 LED CURRENT [mA] 60 50 40 30 20 10 0 0.0 0.3 0.6 0.9 LED PIN [V] 1.2 1.5 SUPPLY CURRENT [mA] Supply Current vs. VDD Pin Voltage 4.0 All LED's ON 3.5 3.0 2.5 2.0 1.5 All LED's OFF 1.0 3.0 3.5 4.0 4.5 VDD [V] 5.0 5.5 LED Current vs. VDD Pin Voltage 31.5 Supply Current vs. RSET Current 8 SUPPLY CURRENT [mA] 7 6 5 4 3 2 1 0 0.0 0.5 1.0 1.5 RSET CURRENT [mA] 2.0 All LED's OFF All LED's ON 31.0 LED CURRENT [mA] 30.5 30.0 29.5 29.0 28.5 3.0 3.5 4.0 4.5 VDD [V] 5.0 5.5 RSET Voltage vs. VDD Pin Voltage 1.30 LED Current vs. RSET Resistor 100 LED CURRENT [mA] 80 60 40 20 0 0.1 1.0 10.0 RSET [kΩ] 100.0 RSET PIN [V] 1.25 1.20 1.15 1.10 3.0 3.5 4.0 4.5 VDD [V] 5.0 5.5 Doc. No. MD-5034 Rev. A 6 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT4008 TYPICAL PERFORMANCE CHARACTERISTICS VDD = 5.0V, LED current 30mA, all LEDs On, TAMB = 25°C unless otherwise specified. RSET Voltage vs. Temperature 1.30 LED Current vs. Temperature 31.5 31.0 LED CURRENT [mA] 1.25 RSET PIN [V] 30.5 30.0 29.5 29.0 28.5 1.20 1.15 1.10 -50 0 50 100 TEMPERATURE [°C] 150 -50 0 50 100 TEMPERATURE [°C] 150 Internal Pull-Down Current (LATCH pin) 30 PULL-DOWN CURRENT [ μ A] . Internal Pull-Up Current (BLANK pin) 30 PULL-UP CURRENT [μ A] . 25 20 15 10 5 0 25 20 15 10 5 0 0 1 2 3 4 LATCH VOLTAGE [V] 5 0 1 2 3 4 BLANK VOLTAGE [V] 5 PWM Dimming on BLANK pin (f = 10kHz) 100 80 DUTY CYCLE [%] 60 40 20 0 0 5 10 15 20 25 LED CURRENT [mA] 30 BLANK Transient Response © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 7 Doc. No. MD-5034 Rev. A CAT4008 PIN DESCRIPTION Name GND SIN CLK LATCH LED1-LED8 BLANK SOUT RSET VDD Function Ground Serial data input pin Serial clock input pin Latch serial data to output registers LED channel 1 to 8 cathode terminals Enable / disable all channels Serial data output pin. LED current set pin Positive supply Voltage PIN FUNCTION GND is the ground reference pin for the device. This pin must be connected to the ground plane on the PCB. SIN is the serial data input. Data is loaded into the internal register on each rising edge of CLK. CLK is the serial clock input. On each rising CLK edge, data is transferred from SIN to the internal 8-bit serial shift register. LATCH is the latch data input. On the rising edge of LATCH, data is loaded from the 8-bit serial shift register into the output register latch. On the falling edge, this data is latched in the output register and isolated from the state of the serial shift register. LED1 – LED8 are the LED current sink channels. These pins are connected to the LED cathodes. The current sinks drive the LEDs with a current equal to about 51 times RSET pin current. For the LED sink to operate correctly, the voltage on the LED pin must be above 0.4V. BLANK is the LED channel enable and disable input pin. When low, LEDs are enabled according to the output latch register content. When high, all LEDs are off, while preserving the data in the output latch register. SOUT is the serial data output of the 8-bit serial shift register. This pin is used to cascade several devices on the serial bus. The SOUT pin is then connected to the SIN input of the next device on the serial bus to cascade. RSET is the LED current setting pin. A resistor is connected between this pin and ground. Each LED channel current is set to about 51 times the current pulled out of the pin. The RSET pin voltage is regulated to 1.2V. VDD is the positive supply pin voltage for the entire device. A small 1µF ceramic is recommended close to pin. CURRENT SETTING RESISTOR Table 1 lists standard resistor values for various LED current settings. Table 1. LED Current and RSET resistor values LED Current [mA] 10 20 30 40 60 80 Doc. No. MD-5034 Rev. A RSET [kΩ] 6.19 3.09 2.05 1.54 1.02 0.768 8 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT4008 BLOCK DIAGRAM LED1 LED2 LED3 VDD VIN LED8 + Current Setting 1.2V Ref GND LATCH L1 L2 L3 LATCHES L8 RSET + CURRENT SINKS BLANK SIN CLK S1 S2 S3 SHIFT REGISTER S8 SOUT Figure 2. CAT4008 Functional Block Diagram BASIC OPERATION The CAT4008 uses 8 tightly matched current sinks to accurately regulate the LED current in each channel. The external resistor, RSET, is used to set the LED 1.2 R SET channel current to about 51 times the current in RSET. LED current ≅ 51× Pull-up and pull-down resistors are internally provided to set the state of the BLANK and LATCH pins to the off-state when not externally driven. SERIAL INTERFACE A high-speed serial 4-wire interface is provided to program the state of each LED on or off. The interface contains an 8-bit serial to parallel shift register (S1-S8) and an 8-bit latch (L1-L8). Programming the serial to parallel register is accomplished via SIN and CLK input pins. On each rising edge of the CLK signal, the data from SIN is moved through the shift register serially. Data is also moved out of SOUT which can be connected to a next device if programming more then one device on the same interface. On the rising edge of LATCH, the data contents of the serial to parallel shift register is reflected in the latches. On the falling edge of LATCH, the state of the serial to parallel register at that particular time is saved in the latches and does not change irrespective of the contents of the serial to parallel register. BLANK is used to disable all LEDs (turn off) simultaneously while maintaining the same data in the latch register. When low, the LED outputs reflect the data in the latches. When high, all outputs are high impedance (zero current). Tight current regulation for all channels is possible over a wide range of input and LED voltages due to independent current sensing circuitry on each channel. The LED channels have a maximum dropout of 0.4V for most current and supply voltage conditions. This helps improve the heat dissipation and efficiency of the LED driver. Upon power-up, an under-voltage lockout circuit clears all latches and shift registers and sets all outputs to off. Once the under-voltage lockout threshold has been reached the device can be programmed. The driver delays the activation of each consecutive LED output channel by 17ns (typical). Relative to LED1, LED2 is delayed by 17ns, LED3 by 34ns and LED8 by 120ns typical. The delay is introduced when LATCH is activated. The delay minimizes the inrush current on the LED supply by staggering the turn on and off current spikes over a period of time and therefore allowing usage of smaller bypass capacitors. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 9 Doc. No. MD-5034 Rev. A CAT4008 PACKAGE OUTLINE DRAWINGS SOIC 16-Lead Narrow Body 150mils (W) (1)(2) SYMBOL MIN NOM MAX A A1 b c E1 E 1.35 0.10 0.33 0.19 9.80 5.80 3.80 0.25 0.40 0º 9.90 6.00 3.90 1.27 BSC 1.75 0.25 0.51 0.25 10.00 6.20 4.00 0.50 1.27 8º D E E1 e h L θ PIN#1 IDENTIFICATION TOP VIEW D h A θ e b A1 L c SIDE VIEW END VIEW For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions in millimeters. Angle in degrees. (2) Compiles with JEDEC MS-012 Doc. No. MD-5034 Rev. A 10 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT4008 (1)(2) SOIC 16-Lead Wide Body 300mils (V) D SYMBOL MIN NOM MAX A A1 b c D E1 E 2.36 0.10 0.33 0.18 10.08 10.01 7.39 0.25 0.38 0º 2.49 0.41 0.23 10.31 10.31 7.49 1.27 BSC 2.64 0.30 0.51 0.28 10.49 10.64 7.59 0.75 E E1 e h L θ 0.81 1.27 8º PIN #1 IDENTIFICATION TOP VIEW h A c θ L b e A1 SIDE VIEW END VIEW For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions in millimeters. Angle in degrees. (2) Compiles with JEDEC MS-013. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 11 Doc. No. MD-5034 Rev. A CAT4008 (1)(2) TSSOP 16-Lead 4.4mm (Y) b SYMBOL MIN NOM MAX A A1 A2 b E1 E 1.10 0.05 0.85 0.19 0.13 4.90 6.30 4.30 0.65 BSC 1.00 REF 0.45 0° 0.75 8° 0.15 0.95 0.30 0.20 5.10 6.50 4.50 c D E E1 e L L1 θ1 PIN#1 IDENTIFICATION TOP VIEW e D c A2 A θ1 A1 L SIDE VIEW END VIEW L1 For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions in millimeters. Angle in degrees. (2) Compiles with JEDEC MO-153. Doc. No. MD-5034 Rev. A 12 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT4008 EXAMPLE OF ORDERING INFORMATION Prefix CAT Device # 4008 Suffix W – T2 Optional Company ID Product Number 4008 Package W: SOIC, 150mils V: SOIC, 300mils (4) Y: TSSOP (4) Tape & Reel T: Tape & Reel 1: 1000/Reel 2: 2000/Reel (1) Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free). (2) The standard lead finish is Matte-Tin. (3) The device used in the above example is a CAT4008W–T2 (SOIC 16-Lead 150 mils, Matte-Tin, Tape & Reel 2000). (4) Contact factory for package availability. (5) For additional package and temperature options, please contact your nearest Catalyst Semiconductor Sales office. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 13 Doc. No. MD-5034 Rev. A REVISION HISTORY Date 01/10/2008 Rev. A Reason Initial Issue Copyrights, Trademarks and Patents © Catalyst Semiconductor, Inc. Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Adaptive Analog™, Beyond Memory™, DPP™, EZDim™, LDD™, MiniPot™, Quad-Mode™ and Quantum Charge Programmable™ Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. 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Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete. Catalyst Semiconductor, Inc. Corporate Headquarters 2975 Stender Way Santa Clara, CA 95054 Phone: 408.542.1000 Fax: 408.542.1200 www.catsemi.com Document No: MD-5034 Revision: A Issue date: 01/10/08