The RAJ240045DNP from Renesas is a Li-ion Battery Fuel Gauge IC that is ideal for notebook PC, tablet PC, docking stations, handheld measurement equipment, POS system, UPS, and power bank applications. This fuel gauge IC requires an input voltage of 4 - 25 V and provides a charge current of up to 100 mA. It has been designed to support 2 - 4 series Li-ion or Li-Polymer battery cells with an integrated ultra-low power RL78 CPU core for multi-function processes, making it a fully integrated battery management solution with battery capacity measurement and programmable protection capabilities. The IC incorporates a code flash memory of up to 64 KB and operates at a chip frequency of up to 32 MHz. It offers multiple serial interface options in addition to an embedded A/D converter with current integration and impedance measurement circuitries. It offers over-current detection, charge and discharge MOSFET control and fuse control features that ensure safe operating conditions. This BMIC is available in a surface-mount package that measures 4 x 4 mm.