Polymer

Polymer capacitors

Capacitors with conductive polymers technologically link the advantages of classic electrolytes (capacity) with the properties of ceramic capacitors for higher switching frequencies (impedance).

In particular, the stability in application, i.e. nominal compared to effective values, and stability against environmental influences (temperature) and ageing (service life) are outstanding.

From the designs that can be used directly on existing layouts, there are a variety of optimisation options when considering the technical characteristics more closely.

 

Why are polymer capacitors gaining importance now?

The miniaturisation of electronic assemblies and components is continuously driven by increased computerisation with simultaneous portability and reduction of power loss.

Polymer capacitors have supported this trend for decades through continuously improved performance in smaller designs.

With regard to industrial and automotive applications, it must be emphasised that the service life and reliability is virtually independent of the construction volume.

This means that a maintenance-free application is guaranteed for years for the highest power densities with associated heat development.

 

What are the benefits for the user?

  • Miniaturisation possibilities through small designs
  • Low power loss through low ESR
  • Highest ripple current capacity per volume / printed circuit board area
  • Temperature stability across the application area
  • Safety and reliability

 

What are the prerequisites for a successful application of the technology?

For an optimal design, the special properties of polymer technology are to be aligned with the actual requirements of the circuitry across its service life. Developers often tend (out of ignorance or time pressure) to rely on past development experience with known technology rather than to utilise the opportunities of advanced technologies.

 

What are the main application areas for polymer capacitors?

In principle, the main application is in the power supply of (core) voltages of up to currently max. 100 V. This is especially for switching regulators in the frequency range from 10 kHz to 1 Mhz on the input and output side as a filter / back-up capacitor at higher currents.  Another use to be pointed out is also the application in the field of FPGA/CPU-based control systems.

 

What are the different technologies for polymer capacitors?

The design is divided into cups (so-called OS-CON and hybrid) and chips (so-called SP-CAP and POSCAP). They are to be chosen depending on the available installation height/area in the application. OS-CON is outstanding for the ripple carrying capacity per volume. The hybrid technology achieves higher capacities and temperatures. SP-CAP achieve the lowest ESR through multi-layer structures while POSCAP achieves higher capacities, even in the smallest designs (up to 0805).

 

Market segments

  • Industry and auto mobile applications
  • Automation technology
  • Telecommunications/infrastructure
  • Visualisation, medical technology
  • Renewable energy
  • Portable devices