Current-mode 2MHz step-up DC-DC converter with internal 2A / 28V switch

A new current-mode, 2MHz step-up DC-DC converter with an internal 2A, 28V switch, the LT8335 has been introduced by Linear Technology. The new device operates from an input voltage range of 3V to 25V, making it suitable for applications with input sources ranging from a single-cell Li-Ion to automotive inputs. The LT8335 can be configured as either a boost, SEPIC or an inverting converter. It utilizes a fixed 2MHz switching frequency, enabling designers to minimize external component sizes and avoid critical frequency bands, such as AM radio. Burst Mode operation reduces quiescent current to only 6µA while keeping output ripple below 15mVP-P. The combination of a 3mm x 2mm DFN package and tiny externals ensures a very compact footprint while minimizing solution cost. The LT8335’s 170mohm switch delivers efficiencies of over 90%, while programmable under-voltage lockout (UVLO) optimizes system performance. A single feedback resistor sets the output voltage whether the output is positive or negative, minimizing external components. Other features include internal compensation, soft-start, frequency fold-back and thermal shutdown protection. The LT8335EDDB is available in a 3mm x 2mm DFN-8 package. An industrial temperature (–40C to 125C) version, the LT8335IDDB, is also available.