The RT7205B is a highly integrated and programmable SMPS controller at the secondary side. It provides the necessary functions and protections for high efficient and high power density off-line AC-DC converter designs. The RT7205B integrates an MCU to handle various proprietary protocols (e.g., FCP, SCP and AFC) through D+/D- interface and also support USB Type-C via CC1/CC2 pins. An internal synchronous rectifier controller can optimize efficiency and provide safe operate in both continuous-conduction mode (CCM) and discontinuous-conduction mode (DCM) even in the condition of a wide output voltage range of 3V to 12V. Dual operational amplifiers with respectively programmable reference voltages are included for voltage-loop and current-loop regulation to provide programmable constant-voltage (CV) and constant-current (CC) regulation in high precision.


  • Travel Adaptors with Fast Charge Protocols (e.g., FCP, SCP and AFC)
  • Travel Adaptors with USB Type-C Control (e.g., 5V/1.5A and 5V/3A)
Key Spec.
Status Active
Policy Manager Integrated
Alternate Mode No
MCU Integrated Yes
Power Role Provider
Data Role DFP
External Power Path Control N-MOSFET Driver
Iq (Typ) (μA) 900
Realtime VBUS Monitoring Yes
Max Output Voltage (V) 12
Syn. Rectifier Yes
CC Pins 2
VBUS Discharge By BLD
Features Adjustable Current Limit;Constant-Current Regulation;I2C;OCP;OVP;SCP;UVP;VBUS OVP;VBUS UVP
Package Type WQFN4x4-24
  • Protocols Supported
    ► SCP, FCP, AFC and Proprietary Protocols
    ► USB Type-C
  • Highly Integrated
    ► Embedded MCU with an Mask-ROM of 16kB, an OTP-ROM of 8kB, and an SRAM of 0.75kB
    ► Built-in Synchronous Rectifier Driver and Controller
    ► Built-in Charge Pump for a Wide VDD Operation Range of 3V to 12V
    ► Built-in Shunt Regulator for Programmable Constant-Voltage and Constant-Current Control
    ► Programmable Cable Compensation
    ► BLD Pin for Quick Discharge of Output Capacitor
    ► USBP Pin for Direct Drive of External Blocking N-MOSFET
    ► Power-Saving Mode in Standby Mode
  • Protection
    ► Adaptive Over-Voltage Protection
    ► Adaptive Under-Voltage Protection
    ► Firmware-Programmable Over-Current Protection
    ► Firmware-Programmable Over-Temperature Protection