The RAJ240080DFP from Renesas is a Li-ion Battery Fuel Gauge IC that has been designed to support up to 5 Li-ion or Li-Polymer battery cells in series. It requires an input voltage of 4-28 V. This IC integrates Renesas ultra-low power RL78 CPU core MCU and an analog front end (AFE) in a single package which enhances multi-functioning to deliver a complete battery management solution. It evaluates the battery's voltage, current, and temperature parameters using built-in 15-bit and 18-bit sigma-delta A/D converters. It employs coulomb counting and voltage-based estimation to evaluate battery parameters such as state of charge (SoC), state of health (SoH), cycle count, and charge/discharge rates.  

This BMIC improves reliability with safety features such as over-voltage, over-current, under-voltage, and over-temperature protections. It utilizes the MCU's 64 KB internal flash memory and 5.5 KB SRAM for storing firmware and temporary data storage. This battery management IC has built-in voltage regulators (3.3V and 1.8V) to power the MCU and other on-chip circuitry and uses SPI, I2C, and UART communication standards. It is available in a surface-mount package that measures 9 x 9 x 0.5 mm and is suitable for e-bikes, e-scooters, pedal-assist bicycles, power tools, vacuum cleaners, drones, battery backup systems, and energy storage system (ESS) applications.