SLVSCR1C September 2015 – July 2017 TPS25810
The device has three power supply inputs; IN1, which is directly connected to OUT via the power MOSFET, is tied to the VBUS pin in the Type-C receptacle. IN2 also has a current limiting switch and is MUXed either to the CC1 or CC2 pin in the Type-C receptacle depending on cable plug polarity. AUX is the chip supply. In most applications all three supplies are tied together. In a special implementation like power wake IN1/IN2 are tied to a single supply while AUX is powered by a supply that is always ON and can be as low as 2.9 V.
USB Specification Revisions 2.0 and 3.1 require VBUS voltage at the connector to be between 4.75 V to 5.5 V. Depending on layout and routing from supply to the connector the voltage droop on VBUS has to be tightly controlled. Locate the input supply close to the device. For all applications, a 10-μF or greater ceramic bypass capacitor between OUT and GND is recommended as close to the Type-C connector of the device as possible for local noise decoupling. The power supply should be rated higher than the current limit set to avoid voltage droops during over current and short-circuit conditions.