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AME5258 Datasheet(PDF) 11 Page - AMETHERM Circuit Protection Thermistors |
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AME5258 Datasheet(HTML) 11 Page - AMETHERM Circuit Protection Thermistors |
11 / 17 page AME 11 AME5258 1.5MHz, 600mA Synchronous Buck Converter Rev.A.05 Figure 9: 3.3V Step-Down Regulator PC Board Layout Checklist When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the AME5258. These items are also illustrated graphically in Figures 10 and Figures 11 . Check the following in your layout: 1. The power traces, consisting of the GND trace, the SW trace and the V IN trace should be kept short, direct and wide. 2. Does the V FB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be connected between the (+) plate of C OUT and ground. 3. Does the (+) plate of CIN connect to V IN as closely as possible? This capacitor provides the AC current to the internal power MOSFETs. 4. Keep the switching node, SW, away from the sensitive V FB node. 5. Keep the (-) plates of C IN and COUT as close as possible. Figure 10: AME5258 Adjustable Voltage Regulator Layout Diagram Figure 11: AME5258 Fixed Voltage Regulator Layout Diagram Figure 8: 3V Step-Down Regulator SW FB GND IN EN R2 R1 VOUT AME5258 L1 COUT CIN CFWD + + - - VIN SW GND IN EN VOUT L1 COUT + + - - AME5258 VOUT CIN VIN SW FB GND IN EN 960K 240K VOUT AME5258 VIN COUT 10 µF CER COUT CER 3V 3.3V to 5.5V 22pF 2.2 µH 4.7 µF SW FB GND IN EN 887K 196K VOUT AME5258 COUT 10 µF CER COUT CER 3.3V 3.6V to 5.5V 22pF VIN 2.2 µH 4.7 µF |
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