BMICs enable scalable battery monitoring
Two battery monitoring ICs (BMICs) from Nuvoton, the KA49703A and KA49713A, are designed for battery backup units used in AI servers and energy storage systems. They can monitor up to 16 lithium-ion cells, while daisy-chain communication enables up to 55 BMICs to be connected in series using a single MCU. This configuration minimizes wiring, ensures robust communication, and reduces the need for additional MCUs and isolation components.
Both devices support battery stack voltages from 12.5 V to 76.8 V. They measure individual cell voltages with a maximum error of ±2.9 mV. The KA49703A and KA49713A provide alarm outputs for overcharge, overdischarge, and abnormal high- or low-temperature conditions. Additionally, the KA49713A includes a dedicated transportation and storage mode that reduces shutdown current to less than 0.1 µA to minimize battery self-discharge.
The BMICs are supplied in 7×7-mm QFP-48 packages. Samples are available now, with mass-production shipments scheduled to begin in September 2026.
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