I am currently trying to use the LMR61428 boost converter IC with the configuration in the attached schematic and having an heating problem with the inductor. The inductor gets very hot very fast even though it is able to carry more current than the intended peak current. The IC is able to function but it shutdowns itself as thermal management starts to work. Is there anything wrong the with schematic or the component selection. The Mosfet is controlled by a microcontroller ATTINY84. The input voltage for the system is 8 volts. Inductor used in PCB
There are a few design flaws overlooked from the datasheet.
- Output is 11.6V = Vdd =Bootstrap which exceeds > 5.5V and
- Ipk inductor = 1.5 output may exceed L rating 2.9A which may be caused by 1.) and
- Switch Current up to 2.85A "spec" = is not same as = I out max at a 11.6V boost voltage.
- Your heater load RX is not given.