SII Semiconductor Introduces New 2-to-4-Cell Lithium-Ion Battery Second Protection ICs
SII Semiconductor, a subsidiary of Seiko Instruments has introduced the S-8224A/B Series 2-to-4 cell lithium-ion battery second protection ICs. They are characterized by a current consumption of 0.25 μA, which is one tenth of that of existing products and the lowest in the industry*1. The S-8224A/B Series is ideal for protecting Lithium-Ion Batteries in laptop computers, power tools and other portable devices.
Lithium-ion batteries require protection from overcharge, overdischarge, overcurrent and short circuits. The use of a secondary protection IC like the S-8224A/B Series is especially critical in cases of overcharge conditions which may result in heating and ignition of the Lithium-Ion batteries. The S-8224A/B provides the design engineer with another robust layer of safety.
The main features of the newly introduced S-8224A/B Series 2-to-4 cell lithium-ion battery second protection ICs include the industry's lowest operating current consumption of 0.25 μA, which helps prolong the battery operation time; secondly, the industry's highest*2 accuracy in overcharge detection voltage of ±20 mV, which provides for further enhanced safety monitoring of lithium-ion batteries; and thirdly, an ultra-small SNT-8A package measuring 2.5 x 2.0 x 0.5 mm, which leads to a reduction in the size, thickness and weight of portable devices.
In addition, the output control function paves the way for adding a PTC-based temperature protection function. This allows the S-8224A/B Series to detect not only overcharge, but also abnormal temperatures. Moreover, the S-8224B Series has a gate connection terminal of the charge control FET equipped with an output voltage control circuit, meaning that the series is also compatible with a FET with a gate-source withstand voltage of 12 volts.
*1, *2: Source: SII Semiconductor Corporation, among the lithium-ion battery protection ICs as of March 2017
