PWM Controller for Programmable Power Converter (USBPD)


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RT7791 series is specifically designed to work with controllers, such as the RT7202, to provide a total solution for USB PD or a programmable power adapter. The RT7791 can achieve high efficiency, meet safety standards, and consume less than 50mW of power in a 5V standby condition.

The RT7791 includes several innovations in order to provide a solution with a wide range of output voltages. By way of DMAG pin, the RT7791 senses output voltages to adjust loop gain for system stability, to adjust output over-voltage protection threshold voltage to protect external devices, and to adjust current limit to meet Limited Power Source (LPS) safety requirements.

The RT7791 is also equipped with comprehensive protection features, including Bulk-Capacitor brown-in /brown-out protection, VDD over-voltage protection (VDD OVP), output over-voltage/under-voltage protection (Output OVP/UVP), secondary rectifier short-circuit protection (SRSP), and external over-temperature protection (External OTP). 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. The RT7791 also provides various features to protect against any failures occurring at the secondary-side component, such as the RT7202 or a shunt regulator.

The RT7791 and the RT7202 work together to realize a robust and safe design to prevent all the potential fault scenarios, which may arise from versatile and unknown connections to various devices, cables, plugs and receptacles.


  • Wireless Charger
  • Industrial and Commercial Low Power Systems
  • Green Electronics/Appliances
  • Point of Load Regulation for High-Performance DSPs
  • MCU Supply in Wireless LED Lighting
Key Spec.
RT7791AE RT7791AEC RT7791GE RT7791LE
Status Preview Active Active Active
Feedback Regulation Mode SSR SSR SSR SSR
Switching Frequency_Normal (kHz) 85 85 85 85
Peak load Application No No Yes Yes
HV Start-up No No No No
CCM/Valley Multi-mode Yes Yes Yes Yes
Programmable Burst/Green-mode No No No No
Brown-in/out Yes (Buck cap.Side) Yes (Buck cap.Side) Yes (Buck cap.Side) Yes (Buck cap.Side)
OVP Adaptive OVP Adaptive OVP Adaptive OVP Adaptive OVP
External OTP Yes Yes Yes Yes
UVLO ON (V) 14.5 14.5 14.5 14.5
UVLO OFF (V) 7 7 7 7
VDD OVP (V) 44 44 44 44
Package Type SOP-8 SOP-8 SOP-8 SOP-8
  • Optimized for Adaptive Output Power
    ► Integrated Low-Dropout Regulator (LDO)
    ► Wide VDD Range : 10V to 40V
    ► Adaptive Output Over-Voltage Protection
    ► Adaptive Over-Current Protection
    ► Adaptive Loop Gain Control for Loop Stability
  • High Efficiency
    ► Green Mode Operation at Light Load or No Load
  • Comprehensive Protection Features
    ► Bulk-Capacitor Brown-In and Brown-Out Protection
    ► OTP Pin for External Over-Temperature Protection
    ► VDD Over-Voltage Protection
    ► Output Over-Voltage and Under-Voltage Protection
    ► Secondary Rectifier Short-Circuit Protection
    ► Programmable Line Compensation
  • Others
    ► < 50mW in 5V Standby Mode for Power Saving
    ► Driver Capability : 300mA/-300mA
    ► SmartJitterTM Technology
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PWM Controller for Programmable Power Converter (USBPD)2018/01/08