We need to convert 32V to 3 channel output: 3.3V(800mA), 1.8V(800mA), 1.35V(3A), Could you recommend a solution?

We need to convert 32V to 3 channel output: 3.3V(800mA), 1.8V(800mA), 1.35V(3A), Could you recommend a solution?
      requirement:
        1): the fewest DC-DC chip
        2): the highest efficiency/ the smallest power consumption;

        3）： cost as low as possible

        4):  easy to buy,  not expire in the following 5 years;