I'm fairly new to electrical engineering, tried my hand at a power supply circuit based on the Texas Instruments buck converter TPS65261RHBR. Goal is to step down from a 12V lawnmower battery to produce 5V, 3.3V, and 1.8V to power a number of other circuits. Unfortunately my design doesn't seem to work, the output tracks don't have the right voltages, trying to get to a workable solution for my next prototype. Here's the schematic for my design, it's very similar to the reference design from TI's datasheet: http://www.ti.com/lit/ds/symlink/tps65261.pdf
Just got printed on a PCB, the results are bad: none of the outputs are producing the correct voltages, 3.3V/5V are 0V, the 1.8V is at 0.6V. I've tested all the input points are about 12.6V. Upon reviewing the datasheet it looks like inductor/cap selection isn't great (especially for the 5V output), but I'm worried this isn't the sole problem because the voltages are so far off, and the splitter resistors seem to be correct.