STMicroelectronics has launched the L9961 battery-management-system (BMS) device for lithium-ion (Li-ion) and lithium-polymer (Li-polymer) batteries. The L9961 BMS controller solution provides monitoring, balancing, and protection of high-energy-density lithium batteries for a variety of applications
The BMS controller is suited for battery packs up to 25 V. Target applications include cordless power tools, backup energy-storage systems, uninterruptible power supplies, portable and semi-portable equipment, and medical devices.
(Source: STMicroelectronics)
Built-in features of the L9961 include a dual pre-driver for controlling battery-pack safety relays, which can be programmed for high-side and low-side connection, and an embedded non-volatile memory for configuration data, which eliminates the need for the microcontroller to reprogram the device at each startup. It also provides an I2C interface that handles configuration and host communication to share battery state-of-charge (SOC) and state-of-health (SOH).
The high-resolution analog-to-digital converter (ADC) and current-sense amplifier enables the L9961 to sense cell voltages with an accuracy of ±15 mV and battery current to within 0.25%. Thanks to the accurate measurements, the solution offers high-accuracy passive cell balancing and coulomb counting, and supports safety features including overvoltage and undervoltage detection, balance undervoltage protection, overcurrent detection and short-circuit in-discharge protection. It also supports hot plugging.
With an externally connected thermistor, the L9961 provides pack temperature monitoring with over/under-temperature detection and pack-fuse management, said ST.
The L9961 extends the battery lifetime, increases safety and consumes minimal energy from the battery pack, said ST. The devices offer two power-saving modes to cut the current consumption down to 2 μA in deep-sleep and 5 μA in standby with the integrated voltage regulator active to resume operation quickly.
The L9961 is in production and is available in a 32-lead 5 × 5 × 1-mm VFQFPN package. Prices start from $1.19 for orders of 1,000 pieces.
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