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DD233
Version Issue Date File Name Total Pages : A.010 : 2004/6/4 : SP-DD233-A.010.doc : 10
4-CHANNEL CONSTANT CURRENT LED DRIVERS
9 7 1
SILICON TOUCH TECHNOLOGY INC.
9-7F-1, Prosperity Road I, Science Based Industrial Park, Hsin-Chu, Taiwan 300, R.O.C. Fax886-3-5645626 Tel886-3-5645656
SILICON TOUCH TECHNOLOGY INC.
DD233
DD233 4-CHANNEL CONSTANT CURRENT LED DRIVERS
DESCRIPTION
The DD233 is a 4-channel constant current LED driver. It's designed to operate as a constant-current sink to drive the LEDs with an external resistance in low power environment. Because the DD233 directly determines output current by each channel in low Bit-to-Bit skew, it is ideal for driving LED whose light intensity is proportional to the current passing through them, not the voltage across their terminals. The ENABLE provides the low power stand by function for mobile applications. This configuration eliminates the need of external capacitors and inductances. With an input voltage range of 2.7V to 6V, so the device can work in general battery system. The value of constant current can be varied using an external resistor (Iout = 5 ~30mA).
GENERAL FEATURES
Constant Current Output, 5~30mA. Supply Voltage VDD is 2.7V to 6V. Bit-to-Bit : 3.0% (Max) @ IOUT = 5 ~ 30mA. Only Need One External Resistor, No Other External Parts. 8-Pin SOP8 or MSOP8 Package.
APPLICATIONS
Digital Cameras Portable MP3 Players White LED Display Backlighting Cellular Telephones Handheld Computers Pagers Personal Digital Assistant E-Books and Sub Notebooks
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version: A.010
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SILICON TOUCH TECHNOLOGY INC.
DD233
Pin Description
OUT3 OUT2 OUT1 OUT0 VDD ENABLE VSS REXT
PIN
NAME VDD Rext GND ENABLE Out0 to Out3
DESCRIPTION Power supply terminal Input terminal of an external resistor Ground terminal Output enable terminal Output terminal
Maximum Ratings (Ta = 25C, Tj(max) = 150C)
CHARACTERISTIC Supply Voltage Output Current Output Voltage GND Terminal Current Power Dissipation Operating Temperature Storage Temperature SYMBOL VDD IOUT VOUT IGND PD Top Tstg RATING -0.5~7 30 ~17 120 0.44 -20 ~ 85 -55 ~ 150 UNIT V mA V mA W C C
Recommended Operating Condition
CHARACTERISTIC Supply Voltage Output Voltage Output Current Operating temperature SYMBOL VDD VOUT IO TOPR CONDITION

Outn
MIN. 2.7 0.2 5 -20
TYP. 3.3 0.6

MAX. 6 5.0 30 85
UNIT V V mA C
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version: A.010
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SILICON TOUCH TECHNOLOGY INC.
DD233
CONDITION MIN.
26.3 4.8
Electrical Characteristics
CHARACTERISTIC SYMBOL
IOL1 Output Current (Bit-Bit) IOL2 IOL3 IOL4
(Typ:VDD = 3.3 V, Ta = 25C unless otherwise noted)
TYP.
1.5
MAX.
3
UNIT
% %
VOUT = 1 V REXT = 12k VOUT = 0.5 REXT = 60k VOUT = 1.0V, REXT = 12k VOUT = 0.5V, REXT = 60k
1.5 29.2 5.31
3 32.1 5.8
Output Current (Chip-Chip)
mA mA
Detailed Description
1) Constant Current Output Value Setting The output current is determined by the resistance connected between REXT pin and GND. The approximate relation between the resistance value and the base current value is shown in Fig1, the approximate equation presented in (Eq.1).
Iout-Rext 35.00 30.00 25.00 Iout0 (mA) 20.00 15.00 10.00 5.00 0.00 0 10 20 30 40 Rext (k) 50 60 70 80
Fig 1 Iout 350.4/Rext (Eq.1)
2) Constant Current Output Value and Output Voltage In order to obtain a good constant current output, a suitable output voltage is necessary. Users can get related information about the minimum output voltage from Fig 2.
4-CHANNEL CONSTANT CURRENT LED DRIVERS
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SILICON TOUCH TECHNOLOGY INC.
DD233
35.00 30.00 25.00 Iout0 (mA) 20.00 15.00 10.00 5.00 0.00 0 1 2 3 Vout (V) 4 5 6
Fig 2
3) Power Dissipation The recommended power dissipation versus temperature is depicted as follows:
SOP8 Power Dissipation-Temperature
600 550
Power Dissipation ( mW )
500 450 400 350 300 250 200 150 100 50 0 0 25 50 75 100 125
Ambient Temperature ( )
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version: A.010
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SILICON TOUCH TECHNOLOGY INC.
DD233
TYPICAL APPLICATION
VDD
8 VDD OUT31 ENABLE 7 ENABLE OUT22 5 REXT OUT13 OUT04 VSS 6
Rext
Fig 3
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version: A.010
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SILICON TOUCH TECHNOLOGY INC.
DD233
DIE CONFIGURATION (UNIT: M)
Die Size: 984.3X643.8 Die Thickness: 300 Pad Size: 80X80 Pin NO. PAD Name 1 Out0 2 Out1 3 Out2 4 Out2 5 Rext 6 GND 7 EN 8 VDD Center Coordinate (X,Y) 80.5 564.1 202.1 564.1 323.7 564.1 445.3 564.1 581.3 391.85 586.5 224.9 724.1 70.8 913.9 419.25
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version: A.010
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SILICON TOUCH TECHNOLOGY INC.
DD233
Package Specification (SOP8)
( 8-pin SOP )
E
H
h x 45
D
A
C
A1 B Seating Plane e L
0
5
10
mm
0.0
0.2
0.4
inch
Dimension in mm Symbol A A1 B C e D H E L h 4.80 5.80 3.80 0.40 0.25 0 MIN. 1.35 0.10 0.33 0.19 MAX. 1.75 0.25 0.51 0.25 1.27BSC 5.00 6.20 4.00 1.27 0.50 8
Dimension in inch MIN. 0.0532 0.0040 0.013 0.0075 0.189 0.2284 0.1497 0.016 0.0099 0 MAX. 0.0688 0.0098 0.020 0.0098 0.197 0.2440 0.1574 0.050 0.0196 8
NOTE
0.050BSC
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version: A.010
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SILICON TOUCH TECHNOLOGY INC.
DD233
Package Specification (MSOP8)
(8-pin MSOP )
E1
E
C
L D 12(4X)
A2
A
A1 y b e
Dimensions in Millimeter SYMBOL A A1 A2 b C D E E1 e L Y MIN 0.81 0.00 0.76 0.15 0.13 2.90 4.80 2.90 0.40 0 NOM 0.92 0.86 0.20 0.15 3.00 4.90 3.00 0.65 0.53 MAX 1.07 0.10 0.97 0.30 0.23 3.10 5.00 3.10 0.66 0.10 6
Dimensions in Inches MIN 0.032 0.000 0.030 0.006 0.005 0.114 0.189 0.114 0.016 0 NOM 0.036 0.034 0.008 0.006 0.118 0.193 0.118 0.026 0.021 MAX 0.042 0.004 0.038 0.012 0.009 0.122 0.197 0.122 0.026 0.004 6
4-CHANNEL CONSTANT CURRENT LED DRIVERS
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SILICON TOUCH TECHNOLOGY INC.
DD233
The products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. Hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention equipment and the like. Misusing those products may directly or indirectly endanger human life, or cause injury and property loss. Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage of the products mentioned above. Anyone who purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. Silicon Touch Technology, Inc. and its distributors and all their officers and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation.
4-CHANNEL CONSTANT CURRENT LED DRIVERS
Version: A.010
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