DD211

DD211 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) SILICON TOUCH TECHNOLOGY INC. No. 9, 4F-3 Chan-Yeh Road 1 Science-Based Industrial Park Tel：886-3-5645656 Fax：886-3-5645626 SILICON TOUCH TECHNOLOGY INC. DD211 DD211 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 component, a capacitor. The built-in oscillator generates a 75% duty-cycle and 350kHz-frequency clock. DD211 also consumes little power with CMOS integrated circuits. DD211 comes 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 component, 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 SILICON TOUCH TECHNOLOGY INC. Pad Descriptions PAD NAME VDD VSS CP CN LEDA DESCRIPTIONS Power Ground Positive Node of ...