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RTL8211FD-CG Datasheet(PDF) 53 Page - Realtek Semiconductor Corp. |
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RTL8211FD-CG Datasheet(HTML) 53 Page - Realtek Semiconductor Corp. |
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53 / 72 page  RTL8211F(I)/RTL8211FD(I) Datasheet Integrated 10/100/1000M Ethernet Transceiver 46 Track ID: JATR-8275-15 Rev. 1.1 9. Regulators and Power Sequence 9.1. Switching Regulator (RTL8211F(I)) The RTL8211F(I) incorporates a state-of-the-art switching regulator that requires a well-designed PCB layout in order to achieve good power efficiency and lower the output voltage ripple and input overshoot. The switching regulator 1.0V output pin (REG_OUT) should be connected only to DVDD10 and AVDD10 (do not provide this power source to other devices). 9.1.1. PCB Layout • The input 3.3V power trace connected to DVDD33 must be wider than 40mils • The bulk de-coupling capacitors (Cin1 and Cin2) must be placed within 200mils (0.5cm) of DVDD33 to prevent input voltage overshoot • The output power trace out of REG_OUT must be wider than 60mils • Lx (2.2µH/4.7µH) must be kept within 200mils (0.5cm) of REG_OUT • Cout1 and Cout2 must be kept within 200mils (0.5cm) of Lx to ensure stable output power and better power efficiency • For switching regulator stability, the capacitor Cout1 and Cout2 must be a ceramic (X5R) capacitor. Cin1 and Cin2 are recommended to be ceramic capacitors • Place Lx and Cin1 on the same layer as the RTL8211F(I). Do not use vias on DVDD33 and REG_OUT traces Note: Violation of the above rules will damage the IC. Figure 10. Switching Regulator |
Similar Part No. - RTL8211FD-CG |
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Similar Description - RTL8211FD-CG |
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