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Li-ion Battery Monitoring LSI   ML5236

Oct 23, 2014

LAPIS Semiconductor, a ROHM Group Company, has recently announced the development of the first lithium-ion battery monitoring LSI compatible with high-voltage NMOSFET*1 control that supports up to 14 cells in series, making it ideal for li-ion battery monitoring in electric bicycles and power storage systems.

The ML5236 monitors the voltage, current, temperature, and charger/load connection in lithium-ion battery monitoring systems and enables charge/discharge control using an NMOSFET on the high-voltage side.
In addition, secondary protection functions*2 such as battery monitoring and protection functions that are typically performed using multiple LSIs are integrated into a single package, improving system reliability, simplifying configuration, and contributing to greater compactness.

A comprehensive support system is provided, including an evaluation board and software that facilitates evaluation, along with manuals and software than can be accessed and downloaded online (registration required).

High-density lithium-ion batteries are expected to see wide adoption in products such as electric bicycles and power storage devices. Implementing charge/discharge control at the high-voltage side is recommended to improve reliability during battery monitoring by preventing communication disruptions and ground wiring disconnections. Transitioning to higher voltage systems also provides greater capacity and contributes to a common platform.

In response, LAPIS Semiconductor has successfully developed a battery monitoring LSI ideal for cutting-edge high-voltage lithium-ion battery monitoring systems by utilizing market-proven mixed signal circuitry and proprietary high-voltage processes, and going forward will continue to meet the demand for high-voltage serial multi-cell battery monitoring LSIs in the industrial equipment and other markets.


    • MOSFETs are transistors that act as a switch to control current flow via externally applied voltage.
      Generally, NMOSFETs switch ON and PMOSFETs switch OFF when voltage is applied.
  • *2 : Secondary protection functions
    • These functions provide simple battery protection independent of the microcontroller, improving reliability.

Target Applications in the Secondary Lithium-Ion Battery Market

Integrating All Functions Required for Battery Monitoring Improves Reliability,
Simplifies Design, and Contributes to Increased Miniaturization

Key Features
  • Compatible with high-voltage-side NMOSFET charge/discharge control systems
    • High reliability can be achieved by utilizing an NMOSFET*1 at the high-voltage side for charge/discharge control. NMOSFETs also provide greater compatibility – in contrast to the more commonly used (and more expensive) PMOSFETs*1.
  • Supports up to 14 cells in series
    • Support for lithium-ion battery monitoring sets of up to 14 cells in series is enabled. In addition, a class-leading breakdown voltage of 80V makes it possible to design higher voltage systems and achieve a common platform.

  • All monitoring functions required for lithium-ion batteries on a single chip
    • The ML5236 includes all monitoring functions (voltage, current, temperature, charger/load connection) necessary for lithium-ion battery monitoring operation.
      Measured values are digitized by the built-in A/D converter and output via SPI, enabling configuration of
      simple battery monitoring circuits that are less susceptible to noise.
  • Secondary protection functions built in (short current and overcharge protection)
    • In addition to li-ion battery monitoring, short-circuit and overcharge protection functions are included- independent of the microcontroller-improving system reliability.


    • MOSFETs are transistors that act as a switch to control current flow via externally applied voltage.
      Generally, NMOSFETs switch ON and PMOSFETs switch OFF when voltage is applied.


  • Electric bicycles, power storage systems, uninterruptible power supplies (UPS)

Sales Plan

Part No.
Sample Shipment Period
Sample Price (tentative)
700 yen (tax not included)
Expected Mass Production Shipment
From October 2014


  • No. of Cells : Up to 14 in series
  • Built-In 12-bit Successive Approximation Type A/D Converter
  • Voltage Measurement Accuracy : ±10mV (typ.)
  • Charge/Discharge Current Measurement Accuracy : ±0.5A/Amplifier Gain x 12 (typ.)
  • Temperature Sensor Measurement Accuracy : ±25mV (typ.)
  • MCU Interface : SPI
  • High Voltage Side Charge/Discharge Control FET : NMOSFET (Direct Drive)
  • Built-in Cell Balancing Switch : Switch ON Resistance = 6Ω (typ.)
  • Secondary Protection Functions : Short Current Detection, Overcharge Detection
  • Current Consumption : 500uA (typ.) during Normal Operation , 0.1uA (typ.) during Power Down
  • Operating Power Supply Voltage : +8 to +64V
  • Operational Temperature : -40 to 85°C
  • Package : TQFP44 (12mm x 12mm)


For customers' inquiry regarding this release: please go to   the inquiry page

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