Hi
I'm using the TPS65251 to create 3 voltage rails and have a design very similar to the reference design in the datasheet and the reference device.
When powering on the board with no load I was getting the correct voltages on the 3 buck outputs, however, when I applied a load to a single buck output (2) the TPS65251 briefly drove the load before a short developed between the LX pins and ground. I used a current limited input voltage source and was able to catch it before anything blow up (thou it was only driving 0.3A at 5V when the short occurred which is well below the current limit I had set). I then pulled the enable pin for the buck which shorted to ground and tested the other 2 bucks under load and they appear to be working as expected.
I'm unsure what could have gone wrong or how the design could be wrong as the 3 bucks have essentially identical circuits (other than component values of course). I have a few more boards I can try but would appreciate any thoughts TI might have.
To confirm the short I removed the inductor from the circuit and checked continuity, which told me that the short is either within the chip or under the chip where I can't see.
Appreciate any thoughts or suggestions people might have
