I am trying to use ADM8828 to provide -5V rail.
-5V is output under open circuit, no load conditions.
But with any load connected the output voltage slumps, e.g. -0.5V across 270 Ohm.
ADM8828 datasheet RevA p 2 recommends electrolytic charge pump capacitors having ESR <0.2 Ohm.
However, I am using 1uF tantalum types, ESR 7.5 Ohm, only because they were to hand and available from my stock.
Could this be the cause of the poor regulation ?
What polarized capacitor types have ESR < 0.2 Ohm and can be recommended ?
As long as ESR is very low, do the capacitors need to be polarized, what are the alternatives ?