Polymer Aluminum Electrolytic CapacitorsUSB Power Delivery usage examples

USB Type-C is becoming the universal standard for USB connectors. The standard connector used up until now could only charge smaller digital equipment such as smartphones. However, with the introduction of the USB PD (USB Power Delivery) standard, USB-C connectors can now be used to charge larger digital equipment with high power consumption, such as laptop PCs. With the latest USB PD standard, USB-C power delivery is increasing from a maximum of 100W to 240W (48V/5A), and with significant user benefits such as greatly reduced charging time, unification of connector types, and the elimination of the need to buy a different adapter for each device, the number of applications for USB-C PD is expected to continue to grow.

Murata's polymer capacitors have low ESR, low impedance, and have a high capacity.
Additionally, they are superior for their ripple absorption, smoothing, and transient response performances since there is no DC bias characteristic for capacitance and the temperature characteristic is stable.
Therefore, it is optimal for smoothing purposes in the input/output stage of power circuits and as backup for load fluctuation around the CPU.
This contributes to reducing the number of parts as well as the size of the circuit board area.

They can be applied on circuits in the diagram below.
Since the standard assumes that the USB PD is inserted and removed while the power is ON, we think high-capacity capacitors will be required on power lines for inrush current resistance and noise resistance.
Additionally, due to device size restrictions, there is a demand for compact and low-profile items.

Because the ECAS series has no mechanical vibrations due to the piezoelectric effect, the acoustic noise is extremely low compared to MLCCs, and the problem of harsh noise can be solved.

There are cases where MLCCs are connected in parallel and used as small capacitors.
The ECAS series is higher in capacity compared to MLCC and have no DC bias characteristics. Therefore, they can be used to reduce the number of components and miniaturize the set for applications that use several MLCCs and require capacitance.

Since MLCC has DC bias characteristics and temperature characteristics, the effective capacity changes when the DC voltage and ambient temperature changes.
On the other hand, since there is hardly any changes in capacitance affected by the DC bias and temperature on the ECAS series, they can be applied for stable power supply designs that do not require having to consider capacitance changes due to temperature and applied voltage.

Since the ECAS series are low-profile components, they are capable of contributing to providing slim and stylish designs for monitors that use USB-PD.
Because of this, as is evident from its name, slim bezel monitors (frameless monitor), which are thin easy-to-see monitors with a wide display area, can be developed.
These monitors can easily be set up in offices with small work spaces.
Additionally, since remote work has become more common, there has been an increase in the number of people that have considered installing monitors for their homes to achieve higher work efficiency. Therefore, there is a high demand for slim monitors that can be installed in any location even at home. Additionally, since there are also portable monitors in the market that enable people to work away from home, we can say that there is a rise in demand for thinner monitors.

The ECAS has more stable reliability compared to tantalum capacitors, which contributes to stable set operation.

ECAS series capacitors burn less readily than tantalum capacitors, resulting in extremely low risk of ignition if a short occurs due to accidental failure.

We have also prepared a PDF document of USB Power Delivery usage examples.
Download the documents below to view the materials.