SC4538 データシートの表示（PDF） - Semtech Corporation

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SC4538

High Efficiency Boost Converter for up to 10 LEDs

Semtech Corporation 

SC4538

Pin Descriptions

Pin #

Pin Name

1

LX

2

EN

3

ISET

4

COMP

5

OUT

6

BL

7

GND

8

IN

T

Thermal Pad

Pin Function

Collector of the internal power transistor — connect to the boost inductor and rectifying Schottky

diode.

Enable and brightness control pin for LED string

Output current set pin — connect a resistor from this pin to GND to set the maximum current.

Output of the internal transconductance error amplifier — this pin is used for loop

compensation and soft-start. Connect a 1.27kΩ resistor and 47nF capacitor in series to GND.

Boost output voltage monitor pin — internal over-voltage protection monitors the voltage at this

pin. Connect this pin to the output capacitor and the anode of the LED string.

LED constant current sink — connect this pin to the cathode of the LED string

Ground

Power supply pin — bypass this pin with a capacitor close to the pin

Pad for heatsinking purposes — connect to the ground plane using multiple vias.

Not connected internally.

8

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