Passives Rohm boosts supercap voltage and conductance

Passives Rohm boosts supercap voltage and conductance

2013/07/30

Rohm has introduced a supercapacitor with 3.0V operation and 25mΩ resistance, claiming these to be industry-leading figures.

The device is a 0.7F pouch-style 25x25x1.4mm electric double layer capacitor (EDLC), the first of the ‘VR’ series.

“Through optimised material selection and proprietary processes, ROHM was able to achieve the industry’s highest voltage,” said the firm. “In addition, an internal resistance of 25mΩ was made possible by devising a surface treatment for the collector electrode that reduced the interfacial resistance, a primary resistance factor, to zero. A thin aluminium laminate package is used for higher output while also contributing to end-product miniaturisation.”

As well as work on interfacial resistance, bulk resistance and ion diffusion resistance have also received attention.

“A reformulated binder material and high-temperature processes has resulted in improved binding characteristics with active materials, lowering resistance even further,” said Rohm.

The firm is aiming the device at direct connection across voltage rails to eat spikes and fill drop-outs, as well for backing-up memory and microcontrollers, and as auxiliary power supply for flashes in digital cameras and camcorders. Solid state memory drives – SSDs – are a particular target.

“Future developments will include peripheral circuits such as LED flash modules that incorporate LED elements and EDLCs by combining IC, LED, and module technologies,” said the firm. “Rohm will also continue to increase capacitances to meet the growing needs for energy storage devices in the automotive and industrial equipment sectors.”

Operation is from -30 to +65°C.

Samples are available this month, with OEM quantities scheduled for January 2014.

At the same time as the VR series, Rohm announced the SR series, which is the same, but with 2.7V and 70°C operation, and the higher temperature (80°C) VT series, also for 2.7V, but with 70mΩ internal resistance.

Time constants are respectively: 17.5, 17.5 and 49mΩF.

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