2-phase boost regulator offers 95% efficiency

The LTC3124 is a dual-phase, 3 MHz, current-mode, synchronous boost dc/dc converter with output disconnect and inrush current limiting. Synchronous rectification enables efficiencies up to 95%, while Burst Mode operation lowers quiescent current to 25 µA, providing extended battery run time. Its internal 2.5 A/phase capable switches together deliver 5 A of switch current. These 18 V switches can deliver output voltages as high as 15 V from an input voltage range of 1.8 V at start-up (0.5 V when running) to 5.5 V, making it suitable for supercapacitor-based backup power systems and Li-ion/polymer or multicell NiMH applications.

The two-phase regulator delivers up to 1.5 A of continuous output current at 12 V from a 5-V input. The combination of its thermally enhanced  3 x 5 mm DFN-16 (or TSSOP-16) package and a constant switching frequency of up to 3 MHz, suits handheld applications. The device regulates the output voltage when the input voltage exceeds the output voltage, enabling compatibility with any battery chemistry.