2025 OCP APAC Summit

Trans-Inductor Voltage Regulator (TLVR) Technology is a new onboard xPU power delivery solution proposed by Google in IEEE APEC 2020.
■ TLVR is an innovative fast-transient onboard voltage regulator (VR) solution for xPUs. This VR topology provides increased VR bandwidth, faster transient response, and potential reduction in decoupling capacitors.
■ TLVR has been widely used in recent years since it offers a good transient performance with reduced equivalent output transient inductance. However, existing TLVR has not been optimized for power efficiency and density.
■ One of the limitations is that each trans-inductor has to be designed for the peak load current in terms of magnetic core saturation.
■ Zero Bias TLVR was introduced to address this limitation. It moves one phase from a primary side to a secondary side.
■ By doing so, the secondary side phase is able to drive TLVR secondary winding with equal magnitude and opposite direction to primary winding current for both DC and transient.