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LMK325BJ226ML Datasheet(PDF) 3 Page - Richtek Technology Corporation |
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LMK325BJ226ML Datasheet(HTML) 3 Page - Richtek Technology Corporation |
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3 / 14 page  RT8055 3 DS8055-05 November 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. WDFN-10L 3x3 SOP-8 Pin Name Pin Function 1 1 SHDN/RT Shutdown Control or Frequency Setting Input. Connect a resistor to ground from this pin sets the switching frequency. Force this pin to VDD or GND causes the device to be shut down. 2, 11 (Exposed Pad) 2, 9 (Exposed Pad) GND Signal Ground. All small-signal components and compensation components should be connected to this ground, which in turn connects to PGND at one point. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. 3, 4 3 LX Internal Power MOSFET Switches Output. Connect this pin to the inductor. 5 4 PGND Power Ground. Connect this pin close to the negative terminal of CIN and COUT. 6, 7 5 PVDD Power Supply Input. Decouple this pin to PGND with a capacitor. 8 6 VDD Signal Supply Input. Decouple this pin to GND with a capacitor. Generally, VDD is equal to PVDD. 9 7 FB Feedback Pin. This pin receives the feedback voltage from a resistive divider connected across the output. 10 8 COMP Error Amplifier Compensation Point. The current comparator threshold increases with this control voltage. Connect external compensation elements to this pin to stabilize the control loop. Function Block Diagram Driver Control Logic OC Limit ISEN Slope Comp. OSC Output Clamp EA 0.8V Internal - Soft Star POR GND FB PVDD VDD PGND LX OTP VREF SD NISEN N-MOSFET ILIM 0.7V 0.4V SHDN/RT COMP |
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