Pin Configuration
VOUT 1
6
GND
VIN
EN
2
3
P1
GND
5
4
SW
FB
Figure 3. UMLP6 Package (Top View)
Pin Definitions
Pin #
1
2
3
4
5
6
Name
VOUT
VIN
EN
FB
SW
GND
Description
Boost Output Voltage . Output of the boost regulator. Connect the LEDs to this pin. Connect C OUT to GND.
Input Voltage . Connect to power source and decouple with CIN to GND.
Enable Brightness Control . Program dimming levels by driving this pin with digital pulses.
Voltage Feedback . The boost regulator regulates this pin to 0.25V to control the LED string current. Tie
this pin to a current setting resistor (R SET ) between GND and the cathode of the LED string.
Switching Node . Tie inductor L1 from the VIN to SW pin.
Ground . Tie directly to a GND plane.
? 2009 Fairchild Semiconductor Corporation
FAN5343 ? Rev. 1.0.4
3
www.fairchildsemi.com
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