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Powering 65-90nm FPGAa and Processors Slide 7

The ADP210x family soft start circuitry limits the output voltage rise time, reducing inrush current at startup. To set the soft start period, connect a soft start capacitor (CSS) from SS to AGND.  The soft start period varies linearly with the size of the soft start capacitor, as shown in the following equation: TSS = CSS × 109 ms.  Therefore, to get a soft start period of 1 ms, a 1 nF capacitor must be connected between SS and AGND.

PTM Published on: 2008-01-22