Called BD14000EFV-C, it can be set to handle cells from 2.4 to 3.1V (in 100mV steps), and multiple chips can be connected to handle series capacitor stacks beyond six cells.
On-chip 1Ω mosfets switch external resistors across the capacitors to control voltage.
Although described as a balancing chip, from the data sheet appears that the chip clamps peak voltage, rather than balancing partially charged supercaps.
“In addition to cell balancing operation, overcurrent detection and flag output functions are included that improve system reliability by detecting the degree of cell degradation,” said the firm.
Qualification is to AEC-Q100.
Super capacitors (aka: ultra-caps and EDLCs – electric double layer capacitor) offer fast charge/discharge performance and long life, suiting them to temporary energy storage in vehicles and industry.
“Conventionally, small capacitance devices are typically used to backup and stabilize compact power supplies – in portable devices, for example – but in recent years capacitances above 300F are being adopted for fast charge/discharge operation in higher power applications such as automotive systems, auxiliary power in industrial equipment, energy regeneration, and the like,” said Rohm.
In stacked configuration, additional components are required if flags and control signals are to be shared between chips.
The chip was developed in partnership with capacitor maker Nippon Chemi-Con.
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