10-cell Li-ion monitor IC operates stand-alone, without MCU supervisor

August 24, 2015 // By Graham Prophet
Aimed at portable products such as cordless vacuum cleaners and electric tools, Lapis Semiconductor’s 10-cell lithium-ion battery monitoring LSI features current consumption of only 25 μA (typ.), claimed as the lowest available, for battery protection systems in portable equipment.

The ML5233 also features 0.1 μA (typ.) current consumption during power down, minimising the effects on battery capacity - even during long-term storage - with virtually no loss of charge. Built-in temperature and short-circuit current detection circuits enable detection of not only over-charge/discharge and overcurrent, but also abnormal (high) temperatures during discharge along with battery pack short-circuits - all without an MCU. This decreases footprint by 20% and reduces the number of external components from four to one, leading to smaller battery protection systems and lighter development load.

Secondary lithium-ion batteries feature greater energy efficiency per volume and weight compared to nickel-cadmium and nickel-metal hydride batteries, making it possible to reduce both size and weight. However, one drawback is that they must be continuously monitored and controlled. Lapis Semiconductor )part of Rohm) will offer further low-power multi-cell lithium-ion battery monitoring LSIs.