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Li-ion battery secondary protection LSI supports up to 14 cells

15 Apr 2016

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Lapis Semiconductor has recently announced the availability of a lithium-ion battery secondary protection LSI that supports up to 14 cells in series–the most in the industry–and features a maximum operating voltage of 80V, delivering functional safety*1 in li-ion battery-equipped systems such as electric bicycles, power storage systems, and UPS.

In recent years, the number of applications using high energy density li-ion batteries has risen dramatically. However, there is a growing need to comply with functional safety standards that protect lives and property while providing a higher degree of reliability. And although li-ion batteries also require measures against over-charge/discharge, the number of cases using secondary LSIs in the event of failure is increasing to meet societal demands for further reliability following expanding applicability.

Until now, Lapis Semiconductor has been focused on developing battery monitoring LSIs, but has recently begun expanding its line-up to meet the need for secondary protection*2 LSIs that play a key role in preventing accidents when battery monitoring LSIs mounted in li-ion systems stop operating due to failure.

The newly developed ML5232 enables detection of up to 14 cells in series, significantly reducing the number of external components and minimising board space while simplifying circuit design compared with conventional secondary protection LSIs that support only 4 cells.

In addition, the ML5232 immediately outputs protection signals when secondary protection LSIs utilized in li-ion battery monitoring systems stop working due to failure. 2 output pins (Nch open drain + CMOS) are included that block charging paths, allowing the charge control MOSFET to be turned OFF while simultaneously cutting the fuse during overvoltage detection, improving system reliability.


Number of Cells SupportedUp to 14 cells in series (Less than 14 cells supported by shorting cells)
Overvoltage detection threshold accuracy4.35V ±20mV (max)
Overvoltage release threshold3.9V ±30mV (max)
Integrated Detection Delay TimerOvervoltage detection delay time: 2 sec; Overvoltage release delay time: 0.2 sec
Dual Overvoltage Alarm OutputN-channel open drain pin/CMOS output pin, Externally-controlled overvoltage alarm detection output
Detection Voltage/Delay TimeMask option
Current Consumption2.7μA(typ.) at normal operation state
Operating Supply Voltage+7 to +80V
Operating Temperature Range-40 to 105°C
Package20pin TSSOP (6.6mm × 6.4mm)

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