Summary from https://training.ti.com/identifying-key-features-automotive-dcdc-converter

wide Vin (load dump, waterfall test)
dropout (cold crank, warm crank, start stop)
low Iq (KOL < 100uA)
switching freq - why 2MHz (AM radio band from 500KHz to 1800KHz)
    no harmonics in AM band

    input filters are smaller
    inductor/capacitor is smaller
EMI