Thanks for the info. Looks like either way, i'll need 2 capacitors, 1 diode and the resistor on the super cap.
Thanks
Here's a quick take on what I would look to doing. Considering the load current it is optional whether to use a feed diode from the supercap or not or use a dual common-cathode to feed from the 6V and the supercap. You could use a regular silicon diode in place of the Schottky but the main thing is to limit the working voltage of the supercap.
Schottky diodes have a higher reverse leakage current than regular silicon diodes, although the effect may be negligible here, since the reverse voltage is small.
Are any of these devices analog? Does Vdd have to be a known, fixed value for accuracy? If so, putting the supercap ahead of the final regulator will be a must.
Comments
Here's a quick take on what I would look to doing. Considering the load current it is optional whether to use a feed diode from the supercap or not or use a dual common-cathode to feed from the 6V and the supercap. You could use a regular silicon diode in place of the Schottky but the main thing is to limit the working voltage of the supercap.
-Phil
-Phil