View CAT4008V-T1_4436903.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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.
0H
TYPICAL APPLICATION CIRCUIT
VIN 3V to 5.5V 1F VDD
CONTROLLER
20mA LED1 LED2 LED8
BLANK LATCH SIN RSET CLK GND 3.09k
CAT4008
SOUT
to next device
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
1
Doc. No. MD-5034 Rev. C
CAT4008
ORDERING INFORMATION
Part Number CAT4008W-T2 CAT4008V-T1 CAT4008Y-T2 CAT4008Y-GT2 Package SOIC16 (N) SOIC16 (W) TSSOP16 TSSOP16
(1)
0F
Quantity per Reel 2,000 1,000 2,000 2,000
(1)(2)
Package Marking CAT4008W CAT4008V CAT4008Y CAT4008Y
(1)(2) (3)
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) (3) Matte-Tin Plated Finish (RoHS-compliant). Contact factory for package availability. NiPdAu Plated Finish (RoHS-compliant). 2
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
Doc. No. MD-5034 Rev. C
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 C, over recommended operating conditions unless specified otherwise. Symbol
ILED-ACC
Name
LED Current (any channel)
Conditions
VLED = 1V, RSET = 3.08k VLED = 1V, RSET = 1.54k VLED = 1V, RSET = 769 VLED = 1V, RSET = 3.08k VLED = 1V, RSET = 1.54k VLED = 1V, RSET = 769 VDD within 4.5V and 5.5V LED current 30mA VLED within 1V and 3V LED current 30mA RSET = 3.08k RSET = 769 RSET = 3.08k RSET = 769 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 IVDD IVLED 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 A k k V V V 5 A V V C C
-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 0.3 1.17 1.20 160 20 1.23 0
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
3
Doc. No. MD-5034 Rev. C
CAT4008
TIMING CHARACTERISTICS For 3.0V VDD 5.5V, TAMB = 25 C, 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 = 50 to 3.0V Pull-up resistor = 50 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 Min1 (1)
F
Typ2 (2)
F
Max3 (1)
F
Units
TEST CIRCUIT FOR AC CHARACTERISTICS
VDD
1F
VDD LED1
Rp
50
CONTROLLER
BLANK LATCH SIN CLK RSET GND SOUT Cl 15pF RSET V1 3V
CAT4008
LED8
Rp
50
Notes: (1) All min and max values are guaranteed by design. (2) VDD = 5V, LED current 30mA.
Doc. No. MD-5034 Rev. C
4
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT4008
1/fclk
CLK tssu tsh tcwl tcwh
SIN tod SOUT tlh LATCH tlwh tlsu
Figure 1. Serial Input Timing Diagram
tld
LATCH tbd BLANK tls
LED1
LED2 tlst = 7 tls LED8
Figure 2. LED Output Timing Diagram
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
5
Doc. No. MD-5034 Rev. C
CAT4008
TYPICAL PERFORMANCE CHARACTERISTICS
VDD = 5.0V, LED current 30mA, all LEDs On, TAMB = 25C 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
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
0.1
1.0 10.0 RSET [k]
100.0
Doc. No. MD-5034 Rev. C
6
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT4008
TYPICAL PERFORMANCE CHARACTERISTICS
VDD = 5.0V, LED current 30mA, all LEDs On, TAMB = 25C unless otherwise specified. RSET Voltage vs. Temperature
1.30
LED Current vs. Temperature
31.5 31.0
1.25 RSET PIN [V]
LED CURRENT [mA]
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 [A] .
Internal Pull-Up Current (BLANK pin)
30 PULL-UP CURRENT [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
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
7
Doc. No. MD-5034 Rev. C
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 1F 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 RSET [k] 6.19 3.09 2.05 1.54 1.02 0.768
8
Doc. No. MD-5034 Rev. C
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT4008
BLOCK DIAGRAM
LED1 LED2 LED3 VDD VIN LED8
CURRENT SINKS
+ Current Setting 1.2V Ref GND RSET
+
BLANK
LATCHES LATCH L1 L2 L3 L8
SHIFT REGISTER SIN CLK S1 S2 S3 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 51x
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.
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
9
Doc. No. MD-5034 Rev. C
CAT4008
PACKAGE OUTLINE DRAWINGS
SOIC 16-Lead Narrow Body 150mils (W)
(1)(2)
4F
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 0 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 8
D E E1 e h L
PIN#1 IDENTIFICATION
TOP VIEW
D
h
A
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. C
10
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT4008
SOIC 16-Lead Wide Body 300mils (V)
(1)(2)
5F
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 0
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
0.81
1.27 8
PIN #1 IDENTIFICATION TOP VIEW
h
c
A
b
e
A1
L
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.
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
11
Doc. No. MD-5034 Rev. C
CAT4008
TSSOP 16-Lead 4.4mm (Y)
(1)(2)
6F
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 1
PIN#1 IDENTIFICATION TOP VIEW
e
D c
A2
A
1
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. C
12
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
CAT4008
EXAMPLE OF ORDERING INFORMATION
Prefix CAT
Device # 4008 Y
Suffix - G T2
Product Number 4008 Optional Company ID Package W: SOIC, 150mils V: SOIC, 300mils (4) Y: TSSOP (4)
Lead Finish G: NiPdAu Blank: Matte-Tin(4)
Tape & Reel T: Tape & Reel 1: 1,000/Reel 2: 2,000/Reel
(1)
7F
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 (TSSOP, NiPdAu, Tape & Reel, 2,000/Reel). (4) Contact factory for package availability. (5) For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice
13
Doc. No. MD-5034 Rev. C
CAT4008
REVISION HISTORY
Date 10-Jan-08 17-Nov-08 03-Feb-09 Rev. A B C Reason Initial Issue Change logo and fine print to ON Semiconductor Update Ordering Information with NiPdAu Plated Finish package
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center: Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative
Doc. No. MD-5034 Rev. C
14
(c) 2009 SCILLC. All rights reserved. Characteristics subject to change without notice

▲Up To Search▲

Price & Availability of CAT4008V-T1

	To Download CAT4008V-T1 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .