Hello,
On the switched capacitor regulator above, the data sheet here: https://www.ti.com/lit/ds/symlink/lt1054.pdf?HQS=dis-mous-null-mousermode-dsf-pf-null-wwe&ts=1645026898519&ref_url=https%253A%252F%252Fwww.mouser.co.uk%252F shows the recommended capacitors for the switched capacitor, input and output capacitors are all Tantalum, because the ESR characterstics are good.
Why is Tantalum better than MLCC capacitors, and why are MLCC capacitors for bypassing (100nF) not used in the example designs? Does the converter need a certain amount of output ESR that is too small with MLCC? Or is it because the switching at 25kHz is relatively small?
On another note, at what point does the resistor placed in series with the switched capacitor become necessary? If I only plan to draw say 10mA from the -5V supply, is it best to just leave the resistor out? Would it be prudent to place a 0R 0805 resistor there to solder a 10R in its place if power dissipation proved too high in the supply?
Finally, is there a need for regulation if you are converting a well-regulated 5V input to a -5V inverted DC signal for supplying negative rail of op-amps? Even if not essential, is it recommended anyway just to keep the output voltage well regulated in case the input voltage has transients etc?
Best regards,
Joel
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