Nuvoton KA49701A and KA49702A for Battery Monitoring in Compact Systems
26. June 2026 | Planegg
With KA49701A and KA49702A, Nuvoton offers two highly accurate battery monitoring ICs designed for use in battery-powered applications requiring accurate monitoring, compact integration and reliable protection functions.
Both BMICs support up to 17 battery cells in series or system voltages up to 85V and combine high voltage measurement accuracy as well as low heat generation in a compact form factor (7mm x 7mm). The devices provide a voltage measurement accuracy of ±2.9 mV, low-side shunt resistor current measurement, built-in self-diagnosis for ADC and MUX, and alarm output for over-/undervoltage, over/under temperature, and short-circuit conditions. In addition, they support external cell balance MOSFET operation as well as charging and discharging relay switch control for 100A systems.
The KA49701A is particularly suitable for cost- and implementation-efficient designs based on a low-side FET driver concept. By supporting low-side charging and discharging relay switch control, it is ideal for battery designs in system architectures with a low-side topology.
While the KA49702A addresses similar battery monitoring requirements, it enables a high-side FET driver concept with more flexible design options for high-side switching and, if required also conversion to low-side concepts. Therefore, battery manufacturers and system developers can benefit from using KA49702A in applications where protection architecture, switching topology and system integration require more flexibility.
Since both KA49701A and KA49702A provide functionality and benefits for battery systems larger than small consumer cells but below full automotive traction battery scale, they are especially suitable for use in battery systems for e-bikes, drones, power tools and comparable compact to mid-range energy storage products.
More information about the Nuvoton KA49701A BMIC and KA49702A BMIC as well as the respective evaluation boards (KA49701A and KA49702A) is available in the ATE-Store.
FAQ
What is the main difference between KA49701A and KA49702A?
The main difference is the switching concept: KA49701A is designed for low-side FET driver architectures, while KA49702A supports a high-side FET driver approach and can offer more flexibility depending on the battery system design.
Which applications are these BMICs best suited for?
Typical use cases include battery systems for e-bikes, drones, power tools and other compact to mid-range battery powered products requiring accurate monitoring and reliable protection.
Why is voltage measurement accuracy relevant?
With ±2.9 mV cell measurement accuracy, both devices are suitable for battery applications where precise monitoring can support performance, safety and battery management quality.
