General Description

The RTS5451 is an advanced Type-C Power Delivery Controller that integrates the Type-C and Power Delivery related hardware and firmware. New features in the PD3.0 specification, e.g., Fast Role Swap, Extended Message transmission, PD FW update and more, are implemented in the RTS5451.

The hardware integrates Configuration Channel (CC) logistics, including bus voltage detectors, Rp/Rd resistors, and internal power switches with overcurrent protection to supply VCONN 5V. The RTS5451 also integrates a low insertion loss and return loss 2:1 mux switch. This mux switch’s bandwidth is over 10Gbps and it can contribute to Type-C plug flipping operation. The embedded MCU and BMC PHY are used for PD message communications. The RTS5451 also integrates a 5V to 3.3V LDO regulator and internal oscillator. These integrated hardware blocks can be applied in various applications and dramatically reduce the system BOM cost.

The RTS5451 firmware supports USB Type-C Specification Release 1.2 specification and Power Delivery specification R3.0 V1.0. All the configurations such as power roles, data roles, and current modes of the Type-C port can be configured by firmware. The MCU and firmware also implements the PD Protocols, including the Policy Engine (PE), Device Policy Management (DPM). The RTS5451 has various interfaces to communicate with other components, such as GPIO, I2C, and SMBUS. It is flexible for extending a variety of applications by using these interfaces as well as simplifying the addition of Type-C USB Power Delivery to any architecture. The RTS5451’s SMBUS/I2C slave interface system can implement system control achieving all Power Delivery related functions, such as Cable detection, Power Negotiation, Power Swap, Data Swap, VCONN Swap, etc. The RTS5451 can be statically configured via SMBUS for customized extra functions. Via the I2C master interface, the RTS5451 can control/configure other chips in the system, such as a PMU with I2C, etc.

The RTS5451 can update its firmware with an embedded SPI flash via flexible ISP channels. The ISP function allows configuration of multiple features and settings. The ISP function is easy to use with USB/SMBUS/CCs and the RTS5451's download tool.

The RTS5451 adopts an industry standard 32-pin QFN 4mm*4mm green package.


  • Supports USB Type-C Specification Release 1.2
    • Supports configuration as DFP, UFP, or DRP
    • Attach and port data-role detection
    • Cable Orientation Detection
    • Type-C current mode detection/configuration as UFP/DFP after connection
    • Audio Accessory mode detection
  • Supports USB Power Delivery Specification R3.0 V1.0
    • Integrated USB Power Delivery (PD BMC) PHY
    • Support for Message Protocol
    • Support for Policy Engine
    • Support for Device Policy Manager
    • Supports Fast Role Swap
    • Supports Extended Message (both chunked and unchunked transmission) 
  • Supports PD FW update via Firmware Update Extended Messages
  • Built-in VCONN switch with over-current protection and support up to 300mA loading
  • Built-in 10Gbps 2:1 mux to support USB3.1 Gen1/Gen2 signal switching
  • Built-in 10-bit SAR ADC that can monitor VBUS voltage /current, local power voltage, battery voltage and so on
  • Digital auto-scan and comparator block of ADC contributes to fast response to system alarm
  • Supports presenting 'Rd' on CCs while power off status to support dead battery application
  • Supports SMBUS/I2C slave for customized configurations and system control
  • Supports I2C master to configure other chips on the same platform
  • Integrated microprocessor
  • Supports serial flash for ISP function to upgrade Firmware or configurations via USB/SMBUS/CCs directly
  • Supports Crystal-less application
  • Integrated 3.3V output LDO 


  • Cellphones
  • Notebook, Desktop PCs
  • Docks
  • Monitors
  • AC Adaptors, Power Bank