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SC4541EVB-2 View Datasheet(PDF) - Semtech Corporation

Part Name
Description
MFG CO.
'SC4541EVB-2' PDF : 19 Pages View PDF
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SC4541
Pin Descriptions
Pin #
Pin #
MLPD-WL6 SOT23-6
1
3
2
2
3
1
4
6
5
5
6
4
T
N/A
Pin Name Pin Function
IN
Input supply pin — add a ceramic capacitor between this pin and ground.
GND
Ground pin — connect to external ground plane.
SW
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
OUT
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
FB
the current sense resistor to set the total current in the LED string(s). LED current is set by :
200/RSENSE (mA), where RSENSE is in Ohms.
EN
Enable and PWM control pin for LED string — pulling this pin logic high enables the device.
Thermal Pad
Pad for heat sinking purposes — connect to the external ground plane using multiple vias
when using MLPD-UT6 package. Not electrically connected internally. The SOT23-6 does not
have a thermal pad.
Block Diagram
VIN 1
EN 6
Bandgap
Reference
1.25V
200mV
Error Amplifier
+
-
Rc
Cc
PWM
-
+
RQ
S
Slope Osc
Comp 2MHz
+
-
OVP
+
- 1.25V
SW
3
Q1
RSENSE
EN
A=1
+
-
4 OUT
2 GND
5 FB
9
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