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EN5312QI Datasheet(PDF) 10 Page - Enpirion, Inc. |
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EN5312QI Datasheet(HTML) 10 Page - Enpirion, Inc. |
10 / 16 page March 2007 EN5312QI 10 LAYOUT CONSIDERATIONS* *Optimized PCB Layout file downloadable from the Enpirion Website to assure first pass design success. Recommendation 1: Input and output filter capacitors should be placed as close to the EN5312QI package as possible to reduce EMI from input and output loop AC currents. This reduces the physical area of the Input and Output AC current loops. Recommendation 2 : DO NOT connect GND pins 3 and 4 together. Pin 3 should be used for the Input capacitor local ground and pin 4 should be used for the output capacitor ground. The ground pad for the input and output filter capacitors should be isolated ground islands and should be connected to system ground as indicated in recommendation 3 and recommendation 5. Recommendation 3 : Multiple small vias (0.25mm after copper plating) should be used to connect ground terminals of the Input capacitor and the output capacitor to the system ground plane. This provides a low inductance path for the high-frequency AC currents, thereby reducing ripple and suppressing EMI (see Fig. 5, Fig. 6, and Fig. 7). Recommendation 4 : The large thermal pad underneath the component must be connected to the system ground plane through as many thermal vias as possible. The vias should use 0.33mm drill size with minimum one ounce copper plating (0.035mm plating thickness). This provides the path for heat dissipation from the converter. Recommendation 5: The system ground plane referred to in recommendations 3 and 4 should be the first layer immediately below the surface layer (PCB layer 2). This ground plane should be continuous and un-interrupted below the converter and the input and output capacitors that carry large AC currents. If it is not possible to make PCB layer 2 a continuous ground plane, an uninterrupted ground “island” should be created on PCB layer 2 immediately underneath the EN5312QI and its input and output capacitors. The vias that connect the input and output capacitor grounds, and the thermal pad to the ground island, should continue through to the PCB GND layer as well. Recommendation 6 : As with any switch-mode DC/DC converter, do not run sensitive signal or control lines underneath the converter package. Figure 5 shows an example schematic for the EN5312QI using the internal voltage select. In this (VS2=0, VS1=1, VS0=1). example, the device is set to a VOUT of 1.5V Figure 5. Example application, Vout=1.5V. Figure 6. Example Application, external divider, Vout = 2.6V. NC NC NC V OUT ENABLE VS0 VS1 VS2 10 9 8 7 20 19 18 17 4.7uF 10 µF V IN V OUT (see layout recommendation 3) NC NC NC V OUT ENABLE VS0 VS1 VS2 10 9 8 7 20 19 18 17 4.7uF 10 µF V IN V OUT Ra=200K Rb=60K (see layout recommendation 3) ©Enpirion 2007 all rights reserved, E&OE www.enpirion.com |
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