Automotive ICs (Integrated Circuits) have seen more integration of high voltage power transistors in the last decade. This trend continues with several low ohmic power transistors getting integrated with Rds_on ranging from 30mΩ to 7Ω based on their application. As semiconductor suppliers increase their expertise in integration, the requirements for automotive ICs continue to increase. In this tutorial, State of the Art, large scale integration (aka System Basis Chips (SBC)) of power circuits like switching converters, Low Drop Out regulators, wave shaped transceivers, complex digital circuitry and low to medium voltage analog cores on a single substrate with advanced diagnostics are discussed. These diagnostics detect the nature of the loads and potential faults (open pins, short circuit to ground, battery etc..) at system level. In addition, the tutorial discusses about the Multiple Supply Voltages (MSV) circuits, level shifting schemes to handle the supply domain crossing, supply faults wave shaping techniques for reduced RF emissions, cross talk between independent circuits due to common supply and ground strategies and how they are mitigated. This is not only applicable for automotive but also industrial and other high voltage consumer ICs.