STMICROELECTRONICS L9961TR Battery Supervisor & Monitor, Li-Ion, Li-Pol, I2C, 4.3 V to 25 V in, VFQFPN-32

L9961TR is a part of complete battery pack monitoring, balancing, and protection system for Li-Ion and Li-Polymer cells in 3, 4 or 5 series configurations. This uses a high-precision ADC to provide cell voltage, stack voltage, and temperature conversion via external NTC. Voltage monitoring functions are cyclically performed with a programmable loop time. Stack current is also monitored via a high-accuracy CSA, continuously running and performing also Coulomb counting. IC configuration and information exchange for SOC/SOH estimation are performed via I²C peripheral. The IC also integrates a dual pre-driver programmable in both HS/LS configurations for driving pack relays. It also implements battery pack fuse protection to prevent fire and explosion hazards. Application includes cordless power tools, backup energy storage systems and UPS, light electric vehicles (e-bikes, scooters, etc), portable and semi-portable equipment and medical equipment.

• VFQFPN32 package, operating junction temperature range from -40 to 120°C
• Integrated 3.3V VREG LDO for supplying MCU and LEDs
• Measures cell voltage, with over/undervoltage detection and balance undervoltage protection
• Measures stack voltage, with over/under voltage detection and plausibility check vs. sum of cells
• Measures pack temperature via NTC, with over/undertemperature detection
• Ratiometric temperature measurement with ±0.8% max. gain error in the V range, for -40 <lt/> TJ <lt/> 105°C
• I2C peripheral for device programming and data transfers over I2C bus
• Cell balancing supporting up to 70mA per cell
• Dual configurable HS/LS predriver for pack relay management
• Pack fuse management, embedded NVM for configuration parameters storage