Linear Technology LT1371CR#PBF, 1 Buck Boost Switching, Buck/Boost Converter 3A, 1.24 → 35 V, 550 kHz 8-Pin,

Linear Technology presents step-up (boost) switching regulators with both synchronous and non-synchronous internal switches. The high efficient DC-DC converters have a wide range of input voltages and switching frequencies. Some products feature unique properties that can help increase battery run time in handheld devices or even be managed in a range of switching configurations. Typical applications would be power inverters, fully floating multiple outputs and 5V logic supplies.

For small circuit implementation

Switching Voltage Regulators, Linear Technology

Linear Technology product series of synchronous and non-synchronous internal switching regulator ICs offer high efficiency plus a wide input voltage range and switching frequencies up to 4MHz.
The controllers span over several types of configurations from buck (step-down), boost (step-up), buck-boost, forward, Isolated, Inverting and flyback controllers. The Flyback, Forward and Isolated Controllers primary and secondary side provide a solution to help replace the DC/DC bricks that get used in back-plane power conversion.