Design of voltage regulators for automotive applications: A sensitivity-driven approach

In this paper, a mathematical framework is presented, helping in the identification and selection of the components that mostly affect performance in monolithic voltage regulators. A sensitivity analysis is proposed, showing how the loop transfer function depends on the values of the components used in the compensator. The theory has been validated through behavioral and transistor level simulations, considering a single-phase interleaved buck converter operated in voltage mode at 2-MHz switching frequency, supplied by a 5-V input and generating a 1-V regulated output. The presented results can be extended to other regulators exploiting Type II and Type III internal compensators.