SC4509 Semtech Corporation, SC4509 Datasheet - Page 5

• Manufacturer Part Number: SC4509
• Description: Highly Integrated Step-Up Converter
• Manufacturer: Semtech Corporation

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© 2007 Semtech Corp.
POWER MANAGEMENT
Pin Descriptions
SOT23
N/A
1
2
3
4
5
6
MLPD 2X2
4, 5
2,3
T
1
8
7
6
Pin Name
EN/SS
VOUT
GND
VIN
SW
FB
Function
Cathode side of the Schottky output voltage. Connect a 0.22μF 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-
nected to logic low, the converter is disabled. The LED brightness can be controlled
by applying a PWM signal to this pin.
Input voltage pin. Connect a 1μF capacitor from this pin to GND.
Switching pin - collector of the internal switch.
Exposed pad (bottom); connect to GND directly beneath package.
5
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SC4509