DD211 Datasheet | SILICON TOUCH TECHNOLOGY

Version Issue Date File Name Total Pages : A.001 : 2002/12/03 : SP-DD211-A.001.doc : 11 A DRIVER, CHARGE PUMP FOR HIGH FORWARD-VOLTAGE LEDS WITH LOW SUPPLY VOLTAGE (2.0V~3.3V) 新竹市科學園區展業一路九號四樓之三 SILICON TOUCH TECHNOLOGY INC. No. 9, 4F-3 Chan-Yeh Road 1 Science-Based Industrial Park Tel：886-3-5645656 Fax：886-3-5645626 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. A DRIVER, CHARGE PUMP FOR HIGH FORWARD-VOLTAGE LEDS WITH LOW SUPPLY VOLTAGE General Description DD211 is designed specifically for driving a high forward-voltage LED as a light source with low supply voltage. Like a charge pump, DD211 doubles the supply voltage, but only requires one external ponent, a capacitor. The built-in oscillator generates a 75% duty-cycle and 350k Hz-frequency clock. DD211 also consumes little power with CMOS integrated circuits. DD211 es in a small die that makes packaging it within a LED module be easy. DD211’s small package, SOT25 occupies only little area for portable device, such as a handset. Features Low supply voltage, 2.0V~3.3V Only one external ponent, a capacitor needed Built-in resistor to limit the output current Low quiescent supply current It is easy to package DD211 within a LED module Applications High forward-voltage LED Indicators’ drivers High forward-voltage LED Back lighters for low-voltage wireless handsets SP-DD211-A.001.doc -1- Version：A.001 點晶科技股份有限公司 SILICON TOUCH TECHNOLOGY INC. Pad Descriptions PAD NAME VDD VSS CP CN LEDA DESCRIPTIONS Power Ground Positive Node of the External Capacitor Negative Node of the External Capacitor Anode of the External LED The Block Diagram and The Application Circuit Power Rin LEDA Charge Pump...