The MICROCHIP TECH. MCP1642B/D devices are compact, high-efficiency, fixed-frequency, synchronous step-up DC-DC converters suitable for applications powered by one, two, or three-cell alkaline, lithium, or NiMH batteries. Its low-voltage technology enables start-up without high inrush current, and integrated synchronous switches maximize efficiency. The open-drain Power Good output simplifies MCU interfacing, and selectable shutdown states minimize power consumption. Available in MSOP and 2x3 DFN packages, the MCP1642B/D offers a versatile solution for portable power applications, including wireless sensors, hand-held instruments, and USB emergency backup chargers.