Automotive EDLC protection ICs for cell-balancing and overcharge protection

SII Semiconductor, a subsidiary of Seiko Instruments, has released the S-19190 Series of automotive EDLC (electric double-layer capacitor) protection ICs featuring cell-balancing and overcharge protection functions. Typical applications include EDLC modules and rechargeable battery modules in demanding automotive environments.

The S-19190 Series is claimed to protect EDLC cells by detecting overcharge conditions and through cell-balancing which levels the voltage in each individual EDLC cell. The Series is said to be the first to protect any number of cells the design calls for. This flexible design approach allows for optimal circuit configuration for many applications.

As the automotive industry continues to expand EV and FCV power offerings the use of EDLC has increased. The EDLC function allows for improved efficiency and design flexibility for high current design requirements such as engine restart during idle stop, storage of regenerative energy during braking, and to manage sudden or instantaneous system voltage drop. Each EDLC cell must be balanced in order to not deteriorate when connecting multiple EDLCs to generate higher voltage.

Available in a 2.8 x 2.9 x 1.3mm SOT-23-6 package, the S-19190 Series’ cell balancing voltage and overcharge detection voltage is selectable from 2.0 to 4.6V in 5mV steps, and current consumption is 2.0µA max. at 25°C.