This reference design is an automotive front-end power supply able to provide 16 W for the 12-V car battery. The first stage is a pre-boost LM5150-Q1 to maintain a stable: mid-rail voltage of 8.5 V during cold-crank operation. Two downstream buck converters are able to handle jump start requirements of up to 40 V. Additionally: an LC filter is built in to improve EMI behavior.