DD212 Datasheet, PDF (5/7 Pages) Silicon Touch Technology Inc. – HIGH POWER CHARGE PUMP FOR WHITE LEDS WITH LOW SUPPLY VOLTAGE

點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
Typical Application
DD212
ON
OFF EN
VDD ^{1.5 ~5.5 V}
C1
VSS
SiTI
DD212
CN
CP
Rext
Cext
Functional Descriptions
DD212 is designed to drive a White LED as a light source with low supply voltage. As typical
application circuit shown, when the EN is on, DD212 will double the supply voltage to drive the
external LED with 50% duty cycle. The resistor Rext is used to limit the driving current.
I_FON
I_F
2VDD
V_{LEDA VDD}
(Without LED)
Dt
1/Freq
040712 DD212_pre
-4-
Version：Preliminary