Power Supply Technology Significantly Reduces Capacitance

Date
06/25/2020

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Solves capacitance issues in power supply circuits

ROHM announces the development of Nano Cap power supply technology that ensures stable control of power supply circuits in the automotive and industrial fields – even with ultra-small capacitances in the magnitude of nF (Nano: 10-9 ).

The growing awareness for sustainable energy consumption has led to greater electrification in a variety of applications. Especially in the automotive field, the number of electrical components continues to increase due to technological innovations spurred by advances in EVs and autonomous driving. Each of these electrical applications requires a variety of voltage sources, all of them stabilized by capacitors. This results in an increasing demand of external components, increasing PCB sizes and adding cost to the Bill of Material..

Following the development of ultra high-speed pulse control technology Nano Pulse Control™ and ultralow current technology Nano Energy™, ROHM has added a third Nano power supply technology, Nano Cap™, that reduces the number of external capacitors required for linear regulators.

In a circuit, typically comprised of a linear regulator and MCU, a 1uF capacitor is usually required at the output of the linear regulator while 100nF is requested at the input of the MCU. However, leveraging ROHM's linear regulator utilizing Nano Cap™ technology - developed by combining analog expertise covering circuit design, layout, and processes - eliminates the need for the capacitor at the regulator output and ensures stable operation with just the 100nF input capacitor. By decreasing both the number of capacitors along with the capacitance needed for power supply circuits in the automotive and other fields, ROHM can contribute to minimizing circuit design load.

Furthermore, Op amp samples utilizing Nano Cap™ technology have already been released in part, and linear regulators utilizing Nano Cap™ technology as well as LED drivers that built-in Nano Cap™ equipped regulators are scheduled to be released in 2020.

ROHM is committed to further enhancing the development of Nano CapTM technology to completely eliminate the need for capacitors while expanding the use of this technology not only to linear regulators, but Op amps, LED drivers, and other analog ICs as well, which contribute to society through the effective use of resources that minimizes environmental load.

About Nano Cap™ Technology
Nano Cap™ power supply technology refers to ultra-stable control technology achieved by combining advanced analog expertise covering circuit design, processes, and layout utilizing ROHM’s vertically integrated production system. Optimized control eliminates the problem of operational stability regarding capacitors in analog circuits, contributing to a reduction in design time for a wide range of applications in the automotive, industrial equipment, consumer, and other fields.

Details of Nano Cap™
Technology Nano Cap provides stable control of linear regulator output by improving response in analog circuits while minimizing parasitic factors related to wiring and amplifiers, making it possible to reduce the output capacitance to less than 1/10th over conventional solutions.

As a result, circuits composed of a linear regulator and MCU which usually require a 1uF capacitor at the output of the linear regulator and a 100nF at the input of the MCU as mentioned above, ROHM's Nano Cap™ linear regulator technology achieve stable operation using just one 100nF capacitor at the MCU side.

For more information, please refer to ROHM's analog power web page.

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