SC4509 Ver la hoja de datos (PDF) - Semtech Corporation

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SC4509

Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2

Semtech Corporation 

SC4509

POWER MANAGEMENT

Pin Descriptions

SOT23 MLPD 2X2 Pin Name Function

1

4, 5

VOUT

Cathode side of the Schottky output voltage. Connect a 0.22μF capacitor from this

pin to ground.

2

2,3

GND

Ground connection

3

1

FB

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

7

VIN

Input voltage pin. Connect a 1μF capacitor from this pin to GND.

6

6

SW

Switching pin - collector of the internal switch.

N/A

T

Exposed pad (bottom); connect to GND directly beneath package.

© 2007 Semtech Corp.

5

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