Categorized | Industry News, ROHM


Posted on 30 March 2019

New Multistage-Compatible 16-Cell Lithium-Ion Battery Monitoring LSI


Scalable design simplifies multi-cell systems increasingly demanded in the industrial equipment market

LAPIS Semiconductor, a ROHM Group company, has recently announced the development of a lithium-ion battery monitoring LSI that supports an industry-best 16 cells in series, significantly reducing the size of lithium-ion battery monitoring systems (i.e. power storage systems).

The ML5239 facilitates multi-cell monitoring and allows for multi-stage series connection to support higher voltage lithium-ion battery monitoring systems requiring more than 16 cells. In addition, current consumption during power down has been minimized to an industry-low 0.1µA, effectively reducing system power consumption.

A comprehensive support system is offered, including evaluation board and sample software that make it easy to verify operation, along with manuals and tools that can be downloaded from our website (registration required).

High-density lithium-ion batteries, which have already been widely adopted in household power storage systems and uninterruptible power systems (UPSs), are expected to see increased demand with the proliferation of smart homes and HEMSs (Home Energy Management Systems). However, these applications require much greater battery capacities than those used for portable electronics or electric tools, necessitating battery monitoring solutions that supports multi-stage connection and higher voltages. It is also important that battery monitoring systems consume minimal current in order to ensure efficient operation in various power-sensitive applications such as emergency power supplies.

Lithium ion battery market

To meet these needs, LAPIS Semiconductor has developed a battery monitoring LSI optimized for high voltage lithium-ion battery monitoring systems utilizing market-proven mixed signal circuit and high-voltage processes. And going forward LAPIS Semiconductor will continue to respond to the demands of the industrial equipment market for higher voltage battery monitoring systems by offering novel multi-cell lithium-ion battery monitoring LSIs that support even greater voltages.

Battery monitoring LSI

*① to ④ in the above diagram correspond with features ① to ④ below, respectively

Key Features

① Supports up to 16 cells in series

The ML5239 is designed for lithium-ion battery monitoring systems utilizing up to 16 cells in series. And class-leading 80V withstand voltage makes it possible to configure higher voltage systems.

② Enables multi-stage series connection

In addition to simplifying multi-cell battery monitoring, multiple LSIs can be connected in series to accommodate higher voltage systems.

③ Minimizes current consumption during power-down

Current consumption is reduced to an industry-best 0.1µA during power down, decreasing system power consumption considerably. This is particularly effective for systems with long monitoring intervals.

④ Integrated A/D converter

Measured values are digitized by the built-in A/D converter and output via SPI, making it possible to construct simple, noise-resistant battery monitoring systems.


Power storage systems, uninterruptible power supplies (UPS)

Sales Plan

  • Part No: ML5239
  • Sample Shipment Period: Ongoing
  • Sample Price (Ref.): $ 11.40 (tax not included)
  • Mass Production Shipment (Est.): From May 2015
  • Production Qty.: 20k pcs/month


Battery monitor specifications

* Information in the press releases is current as of the date of the press announcement, but is subject to change without prior notice.

*Please note that the names of companies and products described in this document are the trademarks or registered trademarks of their respective companies and organizations.


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