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SC4541
Pin Descriptions
Pin #
MLPD-WL6
1
2
3
4
Pin #
SOT23-6
3
2
1
6
Pin Name
IN
GND
SW
OUT
Pin Function
Input supply pin — add a ceramic capacitor between this pin and ground.
Ground pin — connect to external ground plane.
Collector of the internal power transistor — connect this pin to the boost inductor.
Output voltage pin — this pin is the output of the internal Schottky diode. Connect this pin to a
ceramic output (1μF typical) capacitor and current sense resistor.
LED current feedback pin — connect this pin to anode of the topmost LED in the string and
5
5
FB
the current sense resistor to set the total current in the LED string(s). LED current is set by :
200/R SENSE (mA), where R SENSE is in Ohms.
6
4
EN
Enable and PWM control pin for LED string — pulling this pin logic high enables the device.
Pad for heat sinking purposes — connect to the external ground plane using multiple vias
T
N/A
Thermal Pad
when using MLPD-UT6 package. Not electrically connected internally. The SOT23-6 does not
have a thermal pad.
Block Diagram
SW
3
VIN
1
4
OUT
EN
6
Bandgap
Reference
1.25V
-
+
PWM
R Q
Q1
S
200mV
Error Amplifier
+
Slope
Comp
Osc
2MHz
-
Rc
Cc
+
-
EN
R SENSE
2
GND
OVP
+
- 1.25 V
A=1
+
-
5
FB
9
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