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RT8509GQW Datasheet(PDF) 2 Page - Richtek Technology Corporation |
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RT8509GQW Datasheet(HTML) 2 Page - Richtek Technology Corporation |
2 / 9 page ![]() RT8509 2 DS8509-01 March 2012 www.richtek.com © Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Functional Pin Description Pin No. Pin Name Pin Function 1 COMP Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground. 2 FB Feedback. The FB regulation voltage is 1.25V nominal. Connect an external resistive voltage divider between the step-up regulator’s output (VOUT) and GND, with the center tap connected to FB. Place the divider close to the IC and minimize the trace area to reduce noise coupling. 3 EN Chip Enable. Drive EN low to turn off the Boost. 4, 5, 11 (Exposed Pad) GND Ground. The Exposed Pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 6, 7 LX Switch. LX is the drain of the internal MOSFET. Connect the inductor/rectifier diode junction to LX and minimize the trace area for lower EMI. 8 VSUP Boost Converter Over Voltage Protection Input. Bypass VSUP with a minimum 1 μF ceramic capacitor directly to GND. 9 VIN Supply Input . Bypass VIN with a minimum 1μF ceramic capacitor directly to GND. 10 SS Soft-Start Control. Connect a soft-start capacitor (CSS) to this pin. The soft-start capacitor is charged with a constant current of 5 μA. The soft-start capacitor is discharged to ground when EN is low. Function Block Diagram Soft Start Control and Driver Logic Current Sense Protection + - + - Slope Compensation Oscillator OVP LX OTP Error Amplifier VDD 1.25V FB COMP EN VIN VSUP Summing Comparator LX SS GND Clock |
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