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ROHM's Lanshishi Semiconductor has developed LEV that is suitable for the growing market of electric bicycles, and supports 13 power-savings.
Lanshishi Semiconductor, a globally recognized semiconductor manufacturer under the ROHM Group, has introduced a lithium-ion battery monitoring LSI called ML5245, designed to support up to 13 series-connected cells. This advanced chip is ideally suited for electric bicycles, balance scooters, and shopping carts, offering enhanced performance and safety for lithium-ion battery packs.
The ML5245 is a standalone battery monitoring LSI that eliminates the need for a microcontroller, simplifying the development of battery packs. By removing the requirement for complex microcontroller programming, it significantly reduces product development time. In addition to standard battery monitoring features, the ML5245 includes temperature detection, overheat prevention for FETs during charging and discharging, a forced OFF function for discharge FETs, and the ability to read individual battery voltages. These added functions improve system reliability and battery pack safety when combined with external circuits.
One of the standout features of the ML5245 is its extremely low power consumption during shutdown, at just 0.1 μA. This makes it ideal for long-term storage applications where minimizing power loss is critical.
Samples of the ML5245 were available from April 2017, with a sample price of 800 yen per unit (excluding tax). Mass production began in July 2017, with a monthly output of 100,000 units. The pre-processing stage takes place at Lanshishi Semiconductor Miyazaki Co., Ltd. in Japan, while the post-processing is handled by ROHM Integrated Systems in Thailand.
Looking ahead, LPT aims to meet the growing demand for high-voltage battery monitoring systems in industrial equipment, particularly for multi-cell lithium-ion battery packs. As the market for electric bicycles expands—especially in China, where over 30 million units are sold annually—the need for safer, more reliable battery solutions is becoming increasingly important.
In recent years, incidents involving smartphone batteries have raised concerns about lithium-ion safety. To address these issues, the ML5245 integrates key peripheral functions into a single chip, reducing the number of components required and enhancing both system miniaturization and safety.
Key features of the ML5245 include:
1. **Independent Design for Easier Development**
The ML5245 operates without a microcontroller, making battery pack development simpler and accelerating the product development cycle.
2. **Enhanced Safety Features**
It includes built-in temperature detection, overheat protection for charge/discharge FETs, a forced OFF function for discharge FETs, and voltage reading capabilities. These features help reduce the need for external components and improve overall system reliability.
3. **Low Power Consumption**
With a shutdown current as low as 0.1 μA, the ML5245 ensures minimal power loss during storage, extending battery life.
Whether used in electric vehicles, consumer electronics, or industrial applications, the ML5245 represents a significant advancement in battery management technology, offering a safe, efficient, and compact solution for modern lithium-ion battery systems.