40V in/out buck/boost DC/DC

EDN Europe, 21 Nov 2011

Linear Technology’s LTC3115-1 is a synchronous buck-boost converter that delivers up to 2A of continuous output current from a wide range of power sources from single-cell Li-Ion, to 24V/28V industrial rails, to 40V automotive inputs. Its 2.7V to 40V input and output range provides a regulated output with inputs above, below or equal to the regulated output. The low noise buck-boost topology provides a continuous, jitter-free transition between buck and boost modes; use it in RF and other noise-sensitive applications that need a low-noise constant output voltage. You can program switching frequency between 100kHz and 2MHz, or synchronise it to an external clock. Minimal external components and a 4 x 5mm DFN or TSSOP-20E package provides a compact footprint. The device incorporates four internal low RDS(ON) N-channel MOSFETs and offers efficiencies of up to 95%; Burst Mode operation lowers quiescent current to 50μA, improving light load efficiency and extending battery run time. Additional features include internal soft-start, programmable undervoltage protection, short circuit protection and output disconnect. Depending on package and temperature range, pricing ranges from $5.35 to $6.11 (1000)