STMicroelectronics L9962 Battery Management System Solution
STMicroelectronics L9962 Battery Management System Solution is part of a complete battery pack balancing, monitoring, and protection system for Li-Ion and Li-Polymer cells in 4-10 series configurations. The L9962 uses a high-precision ADC to provide stack voltage, cell voltage, and temperature conversion via an external NTC. The device cyclically performs voltage monitoring functions with a programmable loop time. A high-accuracy CSA also monitors stack current, running continuously to perform Coulomb counting. Cell balancing is available and can be activated simultaneously across all cells. An I2C peripheral performs IC configuration and information exchange for SOC/SOH estimation. The IC also integrates a dual pre-driver programmable in both HS/LS configurations for driving pack relays.
The STMicroelectronics L9962 also implements battery pack fuse protection to prevent fire and explosion hazards. A 3.3V regulator with high current capability is available to supply the pack controller and other external circuitry in both normal and standby operation modes. The IC protects the battery pack against over- and undervoltage conditions and monitors for over- and undertemperature conditions. It also features protection against overcurrent (in both directions) and short-circuit during discharge events. Safety-relevant configurations can be stored in the internal NVM to avoid re-programming the device at each wake-up.
Features
- 2μA Shipment - Deep Sleep mode current and 2.5μA standby consumption (with VREG LDO active)
- Integrated 3.3V VREG LDO for supplying the MCU and LEDs
- Measures cell voltage (4 to 10 cells), with over-/undervoltage detection as well as balance undervoltage protection
- 12-bit voltage measurement with maximum error of ±7.5mV in the 1.5V to 4.5V range, for -40°C < TJ < 105°C
- Measures stack voltage, with over/under-voltage detection and plausibility check vs. the sum of cells
- Measures pack temperature via NTC, with over-/undertemperature detection
- Ratiometric temperature measurement with ±0.8% (max.) gain error in the 0.2V to VREG voltage range, for -40°C < TJ < 105°C
- Measures battery current, with Coulomb counting, overcurrent (both directions), and short-circuit in discharge protection
- 16-bit signed current measurement with a maximum error of 0.25%, for -40°C < TJ < 120°C after customer end-of-line calibration with a single point
- I2C peripheral for device programming and data transfers over the I2C bus
- Cell balancing supporting up to 70mA per cell
- Dual configurable HS/LS pre-driver for pack relay management
- Pack fuse management
- Embedded NVM for configuration parameters storage with lock functionality
- High hot-plug robustness
Applications
- Cordless power tools
- Backup energy storage systems and UPS
- Light electric vehicles (e-bikes, scooters, etc.)
- Portable and semi-portable equipment
- Medical equipment
Block Diagram
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STMicroelectronics Standardprodukte
Eine große Auswahl von Drop-in-Ersatzteilen für Universal-Analog-ICs, diskrete und serielle EEPROMs.