The LT3154 is a highly efficient, high current, buck‑boost DC/DC converter that operates from input voltages above, below or equal to the regulated output voltage. The LT3154’s advanced topology provides a continuous transfer through all operating modes. VINoperation from 1.8V to 5.5V provides flexibility for a wide variety of power sources. The output voltage is adjustable between 1.8V to 5.5V.To minimize external components the LT3154 can be configured to operate from a 2.2MHz internal oscillator. To optimize applications for highest efficiency or smallest footprint the oscillator can be programmed between 500kHz to 4MHz, or synchronized to an external clock for noise sensitive circuits.Selectable Burst Mode operation reduces quiescent current to 17μA, ensuring high efficiency across the entire load range. The VINstart-up threshold (UVLO) can be adjusted for various input sources. An internal or externally programmable soft-start limits inrush current during start-up. Other features include <1μA shutdown current, short circuit, and thermal overload protection. The LT3154 is housed in the thermally enhanced 16-lead (3mm × 3mm × 0.74mm) LQFN package.APPLICATIONSPortable Inventory TerminalsHandheld ComputersMedical and Industrial InstrumentsWireless RF TransmitterBackup Power ApplicationsBattery Powered Systems