Buck Boost converter using LTC3440 for an output voltage of 3.3 volts.
RT9907 - 3 Channel DC/DC Converters IC with High-Efficiency Step-Up and Step-Down | Richtek Technology
NCP1034: 100 V Synchronous Buck Controller
60V, 4-Switch Synchronous Buck-Boost Controller Regulates Voltage from Wide Ranging Inputs and Charges Batteries at 98.5% Efficiency at 100W+ | Analog Devices