I am currently looking for a negative output switching regulator to take 36V DC and convert down to -18V DC with at least 1.5A output current. The closest part I see to this on the TI website is the LMZ34002, but its output voltage range only goes to -17V.
I would like to know if there is any data on how the performance changes if its voltage output is adjusted to -18V; I am planning to feed the output through an LDO to have a final output voltage of -17V, to reduce any output ripple that the switcher introduces.