Other Parts Discussed in Thread: LMR51430, TPS2116, TPS2117
Tool/software:
Hello
I have a design where I am using the LM66200 to control whether the System Voltage is 5V from an USB Connector or 5V (output of LMR51430X). It seems to work for some time (minutes) when booth inputs are valid, but after a while the chip starts heating up (+80ºC) and the device power consumption increases by around (40mA on the 12V Input that powers LMR51430X).
The circuit is very "basic":
The (+5V) then pass on another LMR66200 that control the system power either from +5V or from a SuperCap.
The second chip (U23) seems to be working normally.
Is this a problem from VIN1 and VIN2 are too close?
On the first attempt the output of LMR51430 was set to 5.04V which is very close to the USB (5.02~5.11) value, I have increased the output of LMR51430X to 5.19V but the same situation happens after a couple of minutes with booth inputs valid the chips start heating and some extra current consumption.
Is this some issue with having booth voltages very close to one another? Should I use another approach for this function (particularly U24).
Thank You