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RT9170-32GX Datasheet(PDF) 10 Page - Richtek Technology Corporation |
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RT9170-32GX Datasheet(HTML) 10 Page - Richtek Technology Corporation |
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10 / 13 page  RT9170 10 DS9170-11 March 2007 www.richtek.com The final operating junction temperature for any set of conditions can be estimated by the following thermal equation : PD (MAX) = ( TJ (MAX) - TA ) / θJA Where TJ (MAX) is the maximum junction temperature of the die (125° C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance ( θJA)for SOT-23-3 and SOT-23-5 packages at recommended minimum footprint is 250° C/W, 175 °C/W for SOT-89 package ( θJA is layout dependent). Visit our website in which “Recommended Footprints for Soldering Surface Mount Packages ” for detail. PCB Layout Good board layout practices must be used or instability can be induced because of ground loops and voltage drops. The input and output capacitors MUST be directly connected to the input, output, and ground pins of the device using traces which have no other currents flowing through them. The best way to do this is to layout CIN and COUT near the device with short traces to the VIN, VOUT, and ground pins. The regulator ground pin should be connected to the external circuit ground so that the regulator and its capacitors have a “single point ground”. 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: GND VIN VOUT EN NC SOT-23-5 Board Layout |
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