The STC3115 from STMicroelectronics is a Gas Gauge Battery Management IC that is ideal for mobile phones, multimedia players, digital cameras and portable medical equipment applications. It requires an input voltage of 2.7 – 4.5 V. This battery management IC (BMIC) utilizes a patented OptimGauge algorithm to provide precise battery capacity calculations and accurate state-of-charge (SOC) monitoring, irrespective of battery aging, varying operating conditions, or temperature fluctuations. It signals a low SOC state at the output or low voltage conditions and also indicates fault conditions such as missing or swapped batteries. This BMIC features a robust initial open-circuit voltage (OCV) measurement at power-up to ensure reliable readings. It is available in a surface-mount package that measures 3.0 x 2.0 mm.