DD231

DD231 SITI | Alldatasheet

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Version : A.001 Issue Date : 2004/6/1 File Name : SP-DD231-A.001.doc Total Pages : 7 3-CHANNEL CONSTANT CURRENT LED DRIVERS 新竹市科學園區展業一路新竹市科學園區展業一路新竹市科學園區展業一路新竹市科學園區展業一路 9999 號號號號 7777 樓之樓之樓之樓之 1111 SILICON TOUCH TECHNOLOGY INC. 9-7F-1, Prosperity Road I, Science Based Industrial Park, Hsin-Chu, Taiwan 300, R.O.C. Tel：886-3-5645656 Fax ：886-3-5645626

點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version: A.001 P a g e 1 DD231 3-CHANNEL CONSTANT CURRENT LED DRIVERS

DESCRIPTION

The DD231 is a 3-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 DD231 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. This configuration eliminates the need of external capacitors and inductances. With an input voltage range of 3V to 5V , so the device can work in general battery system. The value of constant current can be varied using an external resistor (I out = 5 ~30mA). GENERAL FEATURES ˙Constant Current Output, 5~30mA. ˙Supply V oltage VDD is 3V to 5V . ˙Bit-to-Bit : ± 3.0% (Max) @ IOUT = 5 ~ 30mA. ˙Only Need One External Resistor, No Other External Parts. ˙Small 6-Pin SOT26 Package.

APPLICATIONS

˙White LED Display Backlighting ˙Cellular Telephones ˙Handheld Computers ˙Digital Cameras ˙Portable MP3 Players ˙Pagers ˙Personal Digital Assistant ˙E-Books and Sub Notebooks

點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version: A.001 P a g e 2 Pin Description PIN NAME DESCRIPTION VDD Power supply terminal Rext Input terminal of an external resistor GND Ground terminal Out0 to Out2 Output terminal Maximum Ratings (Ta = 25°°°°C, Tj(max) = 140°°°°C) CHARACTERISTIC SYMBOL RA TING UNIT Supply V oltage V DD 7 V Output Current I OUT 30 mA Output V oltage V OUT ~17 V GND Terminal Current I GND 90 mA Power Dissipation P D 0.35 W Operating Temperature T op -20 ~ 85 °C Storage Temperature T stg -55 ~ 150 °C Recommended Operating Condition CHARACTERISTIC SYMBOL CONDITION MIN. TYP. MAX. UNIT Supply V oltage VDD  2.7 3.3 6 V Output V oltage VOUT  0.2 0.6 5.0 V Output Current IO Outn 5  30 mA Operating temperature T OPR  -20  85 °C Out0 Out1 Out2 Rext GND VDD

點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version: A.001 P a g e 3 Electrical Characteristics (Typ:VDD = 3.3 V, Ta = 25°°°°C unless otherwise noted) CHARACTERISTIC SYMBOL CONDITION MIN. TYP. MAX. UNIT IOL1 VOUT = 1 V REXT = 12kΩ  ±1.5 ±3 % Output Current (Bit-Bit) IOL2 VOUT = 0.5 REXT = 60kΩ  ±1.5 ±3 IOL3 VOUT = 1.0V , REXT = 12k Ω 26.3 29.2 32.1 mA Output Current (Chip-Chip) IOL4 VOUT = 0.5V , REXT = 60k Ω 4.8 5.31 5.8 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 0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 0 102 03 04 05 06 07 08 0 Rext (kΩ) Iout0 (mA) Fig 1 I out ≅ 350.4/Rext (Eq.1) 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.

點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version: A.001 P a g e 4 0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 0 1 23456 Vout (V) Iout0 (mA) Fig 2 TYPICAL APPLICATION VDD Rext VDD Rext GND Out2 Out1 Out0 Fig 3

點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version: A.001 P a g e 5 DIE CONFIGURATION (UNIT: μM) Die Size: 984.3X643.8 Die Thickness: 300 Pad Size: 80X80 Pin NO. PAD Name Center Coordinate (X,Y) 1 Out0 80.5 564.1 2 Out1 202.1 564.1 3 Out2 323.7 564.1 4 Rext 581.3 391.5 5 GND 586.5 224.9 6 VDD 913.9 419.25

點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. 3-CHANNEL CONSTANT CURRENT LED DRIVERS Version: A.001 P a g e 6 Dimensions in Millimeters SYMBOL MIN NOM MAX A 1.00 1.10 1.30 A1 0.00 － 0.10 A2 0.70 0.80 0.90 b 0.35 0.40 0.50 C 0.10 0.15 0.25 D 2.70 2.90 3.10 E 1.40 1.60 1.90 e － 1.90(TYP) － H 2.60 2.80 3.00 L0 . 3 7 －－ θ11 ° 5° 9° (6-pin SOT-26 ) D EH b e AA2 C L 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.