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RT9178 Datasheet(PDF) 10 Page - Richtek Technology Corporation |
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RT9178 Datasheet(HTML) 10 Page - Richtek Technology Corporation |
10 / 11 page RT9178 10 DS9178-15 March 2007 www.richtek.com It should be noted that stability problems have been seen in applications where “vias” to an internal ground plane were used at the ground points of the device and the input and output capacitors. This was caused by varying ground potentials at these nodes resulting from current flowing through the ground plane. Using a single point ground technique for the regulator and it’ s capacitors fixed the problem. Since high current flows through the traces going into VIN and coming from VOUT, Kelvin connect the capacitor leads to these pins so there is no voltage drop in series with the input and output capacitors. Optimum performance can only be achieved when the device is mounted on a PC board according to the diagram below: SOT-23-5 Board Layout GND V OUT EN V IN BP |
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