USB-C Controller Power Supply Architecture with VCONN Switch
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Solution Overview
Problem
Contemporary USB-C IC controllers lack design flexibility and incur higher bill-of-materials costs due to the need for specific IC controllers for different applications, and they are prone to short circuit risks between VBUS and VCONN lines without on-chip over-voltage protection.
Innovation Solution
A power supply architecture that couples VCONN and VBUS supplies to a common power rail, integrating a VCONN switch with over-voltage protection and a VBUS regulator, allowing the same IC controller to operate across various USB-C applications and withstand voltages up to 20V, reducing the need for external regulators and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different IC controllers are used for different USB-C applications, then application-specific performance is optimized, but device complexity and BOM costs increase
Solution Approach 1:
The IC controller is designed with a universal power supply architecture that can operate in multiple USB-C applications (power provider, power consumer, active cable) by accepting different power sources (VBUS, VCONN, or both simultaneously). This multi-functionality eliminates the need for separate controllers for different applications, reducing device complexity while maintaining application-specific performance through configurable power management.
2Adaptability or versatility
If VBUS and VCONN lines are independently powered, then power delivery flexibility is achieved, but short circuit risk increases
Solution Approach 1:
An over-voltage protection circuit is introduced as an intermediary between the VBUS/VCONN power lines and the controller's internal circuitry. This protection circuit monitors voltage levels and isolates the controller from harmful voltage spikes or short circuits, enabling the system to maintain power delivery flexibility while preventing damage to internal components.
3Manufacturing precision
If external voltage regulators are used, then voltage conversion precision is improved, but device complexity and cost increase
Solution Approach 1:
The voltage regulation functionality is merged into the IC controller by integrating on-chip voltage regulators that can convert VBUS (5V) and VCONN (3.3V) to the appropriate internal operating voltages. This integration eliminates the need for separate external regulator components, reducing device complexity and BOM costs while maintaining voltage conversion precision through dedicated on-chip regulation circuits.
Data Source
AI summary
A power supply architecture for USB Type-C controllers is described herein. In an example embodiment, an integrated circuit (IC) controller comprises a VCONN pin, a power rail coupled to internal circuits of the IC controller, and a VCONN switch coupled between the VCONN pin and the power rail. The VCONN switch comprises: a drain-extended n-type field effect transistor (DENFET) coupled between the VCONN pin and the power rail; a pump switch coupled to a gate of the DENFET; a resistor coupled between the VCONN pin and the gate of the DENFET; and a diode clamp coupled between the gate of the DENFET and ground.