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SC4541SKTRT Datasheet(PDF) 9 Page - Semtech Corporation |
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SC4541SKTRT Datasheet(HTML) 9 Page - Semtech Corporation |
9 / 19 page SC4541 9 Pin Descriptions Pin # MLPD-WL6 Pin # SOT23-6 Pin Name Pin Function 1 3 IN Input supply pin — add a ceramic capacitor between this pin and ground. 2 2 GND Ground pin — connect to external ground plane. 3 1 SW Collector of the internal power transistor — connect this pin to the boost inductor. 4 6 OUT 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. 5 5 FB LED current feedback pin — connect this pin to anode of the topmost LED in the string and the current sense resistor to set the total current in the LED string(s). LED current is set by : 200/R SENSE (mA), where RSENSE is in Ohms. 6 4 EN Enable and PWM control pin for LED string — pulling this pin logic high enables the device. T N/A 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 + - + - + - 200mV Slope Comp R S Q PWM 1.25V OVP EN VIN SW OUT GND Rc Cc Bandgap Reference 1.25V Osc Q1 FB Error Amplifier RSENSE EN 2MHz 6 1 3 2 4 5 + - + - A = 1 |
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