The RT7755GEF series is specifically designed to work with controllers, such as the RT7206, to provide a total solution for USB PD or a programmable power adapter. This RT7755GEF not only provides a high power efficiency control scheme, but also gives a 50mW very low standby power control under 5V standby condition.

The RT7755GEF is such a special design to achieve a wide-range of output voltage by utilizing several innovations, including (1) By using DMAG pin, the RT7755GEF senses output voltage to adjust loop gain for system stability, to adjust output overvoltage protection threshold voltage to protect external devices, and to adjust current limit to meet Limited Power Source (LPS) safety requirements; (2) The RT7755GEF is also equipped with comprehensive protection features, including bulk-capacitor brown-in/brown-out protection, VDD overvoltage protection (VDD OVP), output overvoltage/undervoltage protection (Output OVP/UVP), secondary rectifier short-circuit protection (SRSP), and external over-temperature protection (External OTP); (3) For constant output power regulation, a resistor connected to CS pin can be used to achieve accurate line compensation across the universal input voltage range; and (4) The RT7755GEF also provides various features to protect against any failures occurring at the secondary-side component, such as the RT7206 or a shunt regulator.

In applications, it is suggested that the RT7755GEF be used with a secondary controller RT7206 to realize a robust and safe design to prevent all potential fault conditions due to misconnection of various devices, cables, plugs and receptacles.


  • USB PD and Programmable Power Adapters
Key Spec.
Status Active
Feedback Regulation Mode SSR
Switching Frequency_Normal (kHz) 130
Switching Frequency_Peak (kHz) 130
Peak load Application Yes
HV Start-up No
CCM/Valley Multi-mode QR/Valley Switching Multi-Mode
Programmable Burst/Green-mode No
Brown-in/out Yes (Buck cap.Side)
External OTP Yes
UVLO ON (V) 17
UVLO OFF (V) 7.5
VDD OVP (V) 67
Features Cycle-by-Cycle Current Limit;OCP;OVP;PWM;SCP;UVP
Package Type SOT-26
  • Optimized for Adaptive Output Power
    ► Wide VDD Range: 10V to 60V
    ► Adaptive Overcurrent Protection
    ► Adaptive Loop Gain Control for Loop Stability
  • High Efficiency
    ► Green Mode Operation at Light Load and No Load
  • Comprehensive Protection Features
    ► Bulk-Capacitor Brown-In and Brown-Out Protection
    ► VDD Overvoltage Protection
    ► Output Overvoltage and Undervoltage Protection
    ► External Over-Temperature Protection
    ► Secondary Rectifier Short-Circuit Protection
    ► Programmable Line Compensation
  • Others
    ► <50mW in 5V Standby Mode for Power Saving
    ► Driver Capability: 300mA/-300mA
    ► SmartJitterTM Technology