Tool/software: WEBENCH® Design Tools
Hi experts,
i am using LP5912-1.2DRVT and LP5912-1.8DRVT fixed output DC-DC converters. in schematic i am using 5V input voltage and 1.2V, 1.8V output voltage but When i am simulating it in webench tool it constraints me to use lower input range(for 1.2V range is 1.6V-2.9V and for 1.8V range is 2V-3.8V). When i insert 4.7V- 5.5V range as input it automatically reduce this range and says " this voltage is out of input range" however it is stated in datasheet that this device can accept 1.6V-6.5V input range so i am doubted if i can use this device with 5V inputs.
Another question is i am designing an FPGA board thats why regulators and power sources are very close. So i am using 10uF ceramic input and 4.7uF ceramic output capacitors. What do you think about stability and what do you prefer instead of this values?
Kind Regards