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| LP3303 Datasheet, PDF (2/7 Pages) Lowpower Semiconductor inc – High Performance, Constant Current Switching Regulator For 9PCS White LED | |||
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Preliminary Datasheet
Functional pin description
LP3303
SOT-23-6
1
2
3
4
5
6
Pin Name Pin Function
SW
GND
FB
Switch Pin. Connect this Pin to inductor and catch diode. Minimize the track area
to reduce EMI.
Ground Pin
Feedback Reference Voltage Pin. Series connect a resistor between WLED and
ground as a current sense. Sense the current feedback voltage to set the current
rating.
CTRL
Chip Enable (Active High) and dimming Control pin.
OUT
VIN
Output Pin.Connect to output capacitor and LEDs.Minimize trace between this
pin and output capacitor to reduce EMI.
Supply Input Voltage Pin. Bypass 1uF X5R or X7R capacitor to GND to reduce
the input noise.
Function Block Diagram
Absolute Maximum Ratings
Supply Input Voltage(VIN)-------------------------------------------------------------------------------------------â0.3V to 16V
LX Input Voltage --------------------------------------------------------------------------------------------------------â0.3V to 36V
OUT Pin Voltage---------------------------------------------------------------------------------------------------------â0.3V to 29V
CTRL Pin Voltage-------------------------------------------------------------------------------------------------------â0.3V to 10V
FB Pins -------------------------------------------------------------------------------------------------------------------â0.3V to 2.0V
Power Dissipation, PD @ TA = 25°C SOT-23-5 ------------------------------------------------------------------------0.455W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------------ 260°C
Operation Temperature Range ---------------------------------------------------------------------------------â40°C to 80°C
Storage Temperature Range ----------------------------------------------------------------------------------------â65°C to 150°C
LP3303 â03 Ver. 1.3 Datasheet Feb.-2009
Page 2 of 7
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