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SC4509
POWER MANAGEMENT
Pin Descriptions
SOT23
1
2
3
MLPD 2X2
4, 5
2,3
1
Pin Name
VOUT
GND
FB
Function
Cathode side of the Schottky output voltage. Connect a 0.22 μ F capacitor from this
pin to ground.
Ground connection
Feedback input pin. Connect a resistor from this pin to GND to program the LED
current.
Enable pin. When connected to logic high, the converter is enabled. When con-
4
8
EN/SS
nected to logic low, the converter is disabled. The LED brightness can be controlled
by applying a PWM signal to this pin.
5
6
N/A
7
6
T
VIN
SW
Input voltage pin. Connect a 1 μ F capacitor from this pin to GND.
Switching pin - collector of the internal switch.
Exposed pad (bottom); connect to GND directly beneath package.
? 2007 Semtech Corp.
5
www.semtech.com
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