Other Parts Discussed in Thread: TPS746EVM-009, TPS746
I am using TPS74633PQWDRVRQ1 in my design to supply a portable device as shown below. When the input voltage is from a LiPo battery (input voltage ~ 3.4-4.2v), the output voltage is ~3.3v. But when I supply from the VBUS (input voltage ~ 4.5-5v), the output is fixed at 3.45v. I was wondering what is going on here.
Another issue is I am using a switch for the EN signal. The switch works fine and the output of the chip is 0v when EN is connected GND if the input voltage is from the battery. When the input voltage is from the VBUS, the chip produces output even if the EN signal was connected to GND, the output is 3.45v regardless of the EN signal.