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Pin Configuration
GND
A1
EN
A2
VLED
A3
A3
A2
A1
VIN
B1
C1
VOUT
C2
SW
B3
C3
PGND
FB
B3
C3
C2
B1
C1
Figure 3.
WLCSP Package, Top View
Figure 4.
WLCSP Package, Bottom View
GND
1
8
VIN
EN
VLED
FB
2
3
4
P1
GND
7
6
5
VOUT
SW
PGND
Pin Definitions
Figure 5.
8-Pin 3 x 3mm MLP, Top View
Pin #
CSP MLP
Name
Description
A1
1
GND
Analog Ground . All signals are referenced to this pin.
Enable / PWM Brightness Control . A logic LOW on this pin shuts down the IC,
A2
2
EN
disconnects the LEDs from VOUT, and reduces the current consumption of the IC. This
terminal has an internal pull-down resistor of 300k ? .
A3
3
VLED
LED String Output . Connected to the anode of a series string of two to four LEDs.
Current Feedback . The boost regulator regulates this pin to 0.5V to control the LED string
B3
C3
C2
C1
B1
4
5
6
7
8
FB
PGND
SW
VOUT
VIN
current. Tie this pin via a current-setting resistor (R SET ) to GND and the cathode of the LED
string.
Power Ground . The boost switch and gate drivers are grounded at this pin.
Switching Node . Tie inductor L1 from V IN to this pin.
Boost Output Voltage . Output of the boost regulator.
Input Voltage .
? 2010 Fairchild Semiconductor Corporation
FAN5340 ? Rev. 1.0.1
3
www.fairchildsemi.com
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