The current through this switch is limited with the 390 Ohms resistor to IL = 250/Rlimit = 641 mA.
This is a typical value and according to the datasheet we can expect a minimum of 510 mA and a maximum of 800 mA.
The switch (TPS2113A) has a on-resistance of typically 84 mΩ (and maximal 110mΩ).
Target USB VBUS control:
Setting the VBUS_HOST_EN signal low will provide power to
VCC_TARGET_USB_P5V0 from VCC_P5V0 allowing target host mode operation.
The switch (STMPS2161) has an on-resistance of RDSon typ = 90mΩ, max = 110mΩ
Each FET in the power path has a RDSon of <50mΩ@VGS= -5V with a current of up to 20A
That means we can expect a maximum voltage drop across the FETs of 50mV@500mA, 100mV@1A and 200mV@2A.
For USB host mode we need a voltage between 4.4V to 5.25V so the drop that we have is ok and leaves some room for a host switch
on-resistance
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