Ion pumps rely on high-voltage power supplies with low output ripple to generate ultra-high vacuum. This paper presents a 2 to 7 kV DC power supply with less than 10 Vpp voltage ripple designed for such applications. The circuit utilizes high-frequency inverters, planar PCB transformers, Dickson voltage multipliers, and ripple cancellation. The implemented prototype can maintain 0.1 % ripple at light load while achieving 84 % peak efficiency at 80 W.