USB Type-C is more and more popular in many electrical devices such as mobile phone, laptop, hand-held power tools, and cameras. The USB Type-C has some very powerful functions, for example, higher-power input and output based on PD protocol, support USB3.1, support Display port protocol, ear phone connection, and so on. Recently, European Union (EU) lawmakers have reached an agreement on legislation to force all future smart phones sold to support USB Type-C port in the EU. Most of the battery powered cameras only need power input, and some integrate power output features. For most battery powered cameras, where the battery is only charged by adapter, quickly charging and high efficiency is necessary because end customers do not like waiting very long for battery charging.

Figure 3-1 USB Type-C Connection Between Source and Sink

USB Type-C power can be output only after finishing negotiation between two devices by CC line.

If only needing 5-V input, a simple approach is to directly connect 5.1 KΩ resistor on CC pin, Sink receives max 5 V/3 A if the source supports.

If implementing a high-power input or with power input or output feature, a PD controller is needed.

Figure 3-2 TPS25750D Function Block

TI offers most USB Type-C application chips of fully functional USB Type-C or only power path management. TPS25750D is integrated FET and PD controller, and has capability to handle up to 20 V/5 A input and 5 V/3 A output protocol. The TPS25750D has many power protecting features, for example, dead battery startup, current or voltage protection, and so on. By simple GUI configuration, TPS25750D can not only implement most PD power management, but also configure TI battery charger IC through primary I2C port.