LT3999 - Low Noise, 1A, DC/DC Transformer Driver with Duty Cycle Control

Sp-Swreg/Monolithic 55V, 1.2A, 2Mhz Step-Down Regulator With 2.8Ua Quiescent Current

LT3990 - 62V, 350mA Step-Down Regulator with 2.5µA Quiescent Current and Integrated Diodes

3.3V 350mA Fixed Output DC/DC Controller, SOP Package, -40°C to 125°C