General Description

The RTS5444 is an advanced Type-C Controller designed for source-only port applications. It supports USB Type-C Specification Release 1.3 and integrates Configuration Channel (CC) logic, VCONN power switch, VBUS power switch, 5V to 3.3V LDO regulator, and internal oscillator into a single chip.

The RTS5444 supports standard USB, 1.5A and 3A Type-C current mode that can be selected by RP_SEL0/1 pins. When a Type-C sink device is attached and a connection has been established, the #ATTD and #PLG_ORI pins will assert to inform the external controller of an attach event, and notify the plug orientation for USB3.1 SuperSpeed pair routing and connection. #ATTD and #PLG_ORI can also be connected to an external 2:1 MUX for USB3.1 SuperSpeed pair switching in some applications.

The RTS5444 will source VCONN on the CCx line if a Type-C device is attached via electronic cables. The integrated VCONN power switch supports up to 300mA source capability and can fully supply all USB3.1 active cables. The fast current limit response can avoid surge current when CCx is shorted to ground. It will effectively prevent the chip from being damaged and prevent 5V_IN voltage from dropping too much. The VCONN switch will be auto-turned off if an overcurrent event has been sustained for 200ms.

The RTS5444 also integrates an ultra-low RDS (ON) power distribution switch. This VBUS power switch supports up to 5V/3A source capability and has a current-limit function to protect the power source from overcurrent or hard short conditions. The current limit value is adjusted according to Type-C current mode selected by RP_SEL1/0 pins. It also incorporates over temperature protection and a reverse blocking function. When an overcurrent event occurs, the #FLT pin will assert to inform an external controller after debounce. The external controller can turn off the VBUS power switch by driving the EN pin low, or by leaving the power switch auto turned off after 200ms debounce. When an over temperature condition arises, the power switch will shut down immediately and the #FLT pin will also assert to inform an external controller after debounce. The power switch will automatically retry to turn on if the EN pin remains high and the temperature decreases to a safe value.

The RTS5444 adopts an industry standard 20-pin QFN 3mm*2mm Green package.


  • Supports all Type-C Channel Configuration (CC) functions according to USB Type-C Specification Release 1.3
    • Type-C sink device attach/detach detection
    • Type-C debug accessory attach/detach detection
    • Type-C audio accessory attach/detach detection
    • Type-C plug orientation detection when sink device or debug accessory attached
    • Type-C standard USB, 1.5A and 3A current mode advertisement
  • Built-in VCONN switch with overcurrent protection to support up to 300mA source capability
  • Integrated microprocessor
  • Support for Crystal-less application
  • Integrated 5V to 3.3V LDO
  • Built-in VBUS power switch to support up to 5V/3A source capability
    • Programmable current-limit function to protect power source from overcurrent and short circuit conditions
    • Over temperature protection
    • Auto discharge when VBUS power switch turned off
    • Reverse blocking function when VBUS power switch is off


  • Notebook, Desktop PCs