Startup Behaviour of Power Managment Unit for an Integrated Gate Driver

The start-up is a critical part for supply voltage generation of integrated circuits. Especially ICs utilizing multiple voltage rails demand a careful consideration of the start-up. This task is generally fulfilled by a power management unit (PMU) which, despite the increasing integration level, still is mostly implemented discretely. This paper proposes an integrated PMU generating three different supply voltages, featuring one buck converter to efficiently generate the most energy consuming supply. The start-up of the PMU is considered and the functioning is verified by measurement results.