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SC4538
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
T
Pin Name
LX
EN
ISET
COMP
OUT
BL
GND
IN
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 1.27k Ω 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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