Unidirectional ring mitigation in a voltage converter

In a system having a high side transistor coupled to a first voltage node and a low side transistor coupled to the high side transistor at a switch node, a circuit comprising:

• an output inductor connected to the switch node;
• an output capacitor connected between the output inductor and a common potential;
• and
• a series combination of a diode and a capacitive component connected between the first voltage node and the common potential;
• wherein, responsive to a voltage on the first voltage node beginning to ring by more than a non-zero threshold, the diode turns on and current flows from the first voltage node to the capacitor to thereby charge the capacitive component, the diode configured to block current from flowing from the capacitive component to the first voltage node.

A system, comprising:

• a high side transistor switch coupled to a first voltage node;
• a low side transistor switch coupled to the high side transistor switch at a switch node;
• and
• a unidirectional decoupling circuit including a charge storage component, wherein the unidirectional decoupling circuit is coupled between the first voltage node and a common potential, the unidirectional decoupling circuit configured to block current from flowing from the charge storage component to the first voltage node;
• wherein, responsive to a voltage on the first voltage node beginning to ring by more than a non-zero threshold, the unidirectional decoupling circuit is configured to sink current from the first voltage node to charge the charge storage component.