A synchronous, buck-boost converter, the LTC3115-1, from Linear Technology, delivers up to 2A of continuous output current from a single-cell Li-Ion; 24V or 28V industrial rails and 40V automotive inputs. The 2.7 to 40V input range and 2.7 to 20V output range provides a regulated output with inputs above, below or equal to the regulated output. The low noise buck-boost topology is claimed to provide a continuous, jitter-free transition between buck and boost modes. Switching frequency is user-programmable between 100kHz and 2MHz, and can be synchronised to an external clock. The converter has four internal low RDS(ON) N-channel MOSFETs to deliver efficiencies of up to 95%. User-selectable Burst Mode operation lowers quiescent current to only 50μA, improving light load efficiency and extending battery run time.
