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ADP2114/2116 output current


I am trying to consider DC-DC regulator to the power of analog circuit with a high sensitivity. As a result of reading the attached file, I want to consider the ADP2114/2116.

1. Using single mode, it outputs 4A/6A. For example, by connecting in parallel 2 devices, is it possible to output the current 2 times more?

2. About Fig.6 and Fig.7 of the attached file, it shows that there is no influence of the noise of the power supply. In this point of view, which of ADP2114/2116 and ADP2323/2325 is better? I consider ADP2323/2325 also because they can output large current.

3. I am also looking for a negative DC-DC supply. Is there a device that can be expected noise performance similar to that of the ADP2114/2116?

Best Regards,