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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 leading semiconductor manufacturer under the ROHM Group, has introduced a lithium-ion battery monitoring LSI called "ML5245," which supports up to 13 series-connected cells. This advanced chip is ideally suited for use in electric bicycles, electric balance scooters, and electric shopping carts, making it a versatile solution for low-energy vehicles (LEVs).
The ML5245 is a standalone battery monitoring LSI that operates without the need for a microcontroller. This feature simplifies the development of battery packs by eliminating the time-consuming process of programming microcontrollers, ultimately reducing the product development cycle for customers. In addition to standard battery monitoring functions, the ML5245 includes several enhanced safety features such as temperature detection, overheat protection for FETs during charging and discharging, a forced shutdown function for discharge FETs, and the ability to read individual battery voltages. These added functionalities help improve system reliability and battery pack safety.
Moreover, the ML5245 consumes only 0.1 μA during shutdown, which significantly reduces power loss during long-term storage, ensuring better performance when the device is reactivated.
Samples of the ML5245 were available for sale starting in April 2017 at a price of 800 yen per unit (excluding tax), with mass production planned to begin in July 2017 at a monthly capacity of 100,000 units. The pre-processing stage is handled by Lanshishi Semiconductor Miyazaki Co., Ltd. in Miyazaki, Japan, while the post-processing is managed by ROHM Integrated Systems (Thailand) Co., Ltd. in Thailand.
Looking ahead, Lanshishi Semiconductor aims to continue meeting the growing demand for high-voltage battery monitoring systems in the industrial equipment market, particularly for multi-cell lithium-ion battery packs.
In China, where the market for electric bicycles has grown significantly, annual sales have reached over 30 million units, with around 2.7 million units using lithium-ion batteries. As the market expands, especially in emerging countries, demand for safe and efficient battery solutions is expected to rise sharply.
Smartphones, which commonly use lithium-ion batteries, have faced issues like overheating and self-ignition, raising concerns about battery safety. To address these challenges, the ML5245 integrates multiple peripheral circuit functions into a single chip, reducing the number of external components needed, thus achieving a more compact and reliable system.
Key advantages of the ML5245 include:
1. **Simplified Development**: With no need for a microcontroller, the ML5245 makes battery pack development easier and faster.
2. **Enhanced Safety Features**: It includes built-in temperature sensing, overheat prevention for FETs, a forced shutdown function, and voltage reading capabilities, all contributing to safer and more reliable battery operation.
3. **Low Power Consumption**: At just 0.1 μA in shutdown mode, the ML5245 ensures minimal power loss during storage.
These features make the ML5245 an ideal choice for manufacturers looking to build safer, more efficient, and more compact battery systems for a wide range of applications.