The TPS26750 works in conjunction with the TPD4S480 to provide the following functionality
in USB-PD EPR:
- Short to VBUS protection for direct
shorts to CC1 and CC2 pins of the Type-C connector.
- Short to VBUS protection for the liquid
detection circuitry that is connected to the SBU1 and SBU2 pins of the Type-C connector,
if the liquid detection feature is implemented.
- Voltage level translation from up the EPR
maximum voltage down to the operation range of the VBUS pins of the TPS26750.
- Gate Drive for a high voltage NMOS
transistor to allow the internal 5V power path to be used to source 5V in systems that
only require a 5V output.
The TPS26750 also provides an analog signal
that is driven to 9V with a 10uA capable charge pump. This signal is buffered with 2 source
followers to provide a level shifted signal to control an external power switch, as shown in
the figure below.