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Renesas claims industry first in supporting USB PD v.2, v.3

Posted: 14 Apr 2016 ?? ?Print Version ?Bookmark and Share

Keywords:power supply? RAA230161? USB Power Delivery? USB PD?

Renesas Electronics Corp. has claimed it is the first to release a power supply IC, the RAA230161, that supports the Power Rules requirements defined in the USB Power Delivery (USB PD) 2.0 and 3.0 specifications from USB Implementers Forum (USB-IF).

The chip is essentially a DC/DC converter with protection circuitry (see block diagram below). The IC finds application with equipment like AC adapters, PC peripheral equipment, and home and office equipment. The USB PD specification allows provision of DC power over USB cable to equipment, such as notebook PCs and DSLRs that previously could not be powered over a USB cable.


Figure 1: Renesas RAA230161 offers 95% DC-DC conversion efficiency with support for USB PD 2.0 and 3.0.

The USB PD adds power over the 7.5W (5V at 1.5A) of the previous USB standards. With this spec, you can additionally deliver power levels like 15W (5V at 3A), 27W (9V at 3A), 45W (15V at 3A), 60W (20V at 3A) and even 100W (20V at 5A).

This means you may be faced with supporting multiple voltage levels of the USB PD standards, output voltage switching and handling large currents. New designs for USB PD power supply will need to provide a higher level of safety and reliability.

Renesas's design for the RAA230161 IC is centred around DC/DC converters that can achieve an efficiency of up to a 95% while suppressing heat generation. The RAA230161 has a 20-pin TSSOP package with a built-in heat sink to handle the heat. The step down DC/DC converter handles currents up to 3A, operates at 500kHz, has an input voltage of 24V and outputs USB PD voltages of 5V, 9V, 15V and 20V as well as the 12V level of many DC devices.

Circuit protection

The RAA230161 monitors the output current value with a high-functionality power supply status monitoring circuit and protects the system so that current in excess of a set value is not output. It integrates various protection functions, including overvoltage protection, overcurrent protection and short circuit protection.

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Figure 2: The chip is essentially a DC/DC converter with protection circuitry. Renesas has reference designs that add control circuitry, such as the R9A02G011 USB PD 3.0 controller.

If you've been using Renesas's previous models, the company claims you can reduce the relevant circuit board space by about 50% with the RAA230161. The company is also offering a number of reference boards that include this chip along with the R9A02G011 USB PD 3.0 controller.

The RAA230161 was displayed today at the Intel Developer Forum (IDF) in Shenzhen, China. Samples are available now with production of 500,000 units/month scheduled to start September.

- Vivek Nanda
??Executive Editor

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