The TPS25820/21 are Type-C source controllers. The TPS25820 supports all Type-C DFP required functions to support a USB 3.x port and the TPS25821 supports all required functions for a USB 2.0 DFP. The TPS25820/21 only applies power to VBUS when it detects a sink is attached and removes power when it detects the sink is detached. The device exposes its identity via its CC pin advertising its current capability based on the CHG pin setting. The TPS25820/21 also limits its advertised current internally and provides robust protection against faults on the system VBUS power rail.
After a connection is established by the TPS25820/21, the TPS25820/21 device is capable of providing VCONN to power circuits in the cable plug on the CC pin that is not connected to the CC wire in the cable. VCONN is internally current limited. The TPS25820/21 do not support Type-C optional accessory modes (Ra/Ra and Rd/Rd in Table 2).
The following design procedure can be used to implement a full featured Type-C source.