CHARGE PUMP
DD211
Version Issue Date File Name Total Pages
: A.001 : 2002/12/03 : SP-DD211-A.001.doc : 11
A DRIVER, CHARGE PUMP F...
Description
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.
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