DD211 Datasheet, PDF (5/11 Pages) Silicon Touch Technology Inc. – A DRIVER, CHARGE PUMP FOR HIGH FORWARD-VOLTAGE LEDS WITH LOW SUPPLY VOLTAGE (2.0V~3.3V)

點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
DD211
Functional Descriptions
DD211 is designed to drive a high forward-voltage LED as a light source with low supply
voltage. As Fig.a shown, when the power is on, DD211 will double the supply voltage to drive the
external LED with 75% duty cycle. The built-in resistor of DD211 is used to limit the driving
current.
VLEDA
+
Fig.a Cext _{_}
LEDA
CP
DD211
CN
VSS VDD
hv
IF
Ground
Ground
Power
IFON
IF
2VDD
VLEDA
(Without LED)
VDD
Dt
1/Freq
Test Circuits
As Fig.a shown.
SP-DD211-A.001.doc
-4-
Version：A.001