Renesas Technology Europe announced the availability in Europe of the RJK0383DPA, a dual-type power MOSFET for synchronous rectification DC/DC converters. The device achieves higher power supply efficiency and can be used for memory or ASICs in products such as laptop PCs and communication devices. Sample shipments will begin in October 2008. RJK0383DPA incorporates dual power MOSFETs of two different types, composing a synchronous rectification DC/DC converter in a WPAK high-thermal-radiation package measuring 5.1 × 6.1 mm and 0.8 mm thick (max.). The device integrates dual power MOSFETs of two different types, one as the high-side elementand the other as the low-side element. The high-side power MOSFET has a drain-gate load (Qgd) of 1.5 nC (at VDD=10V) to provide high switching speed and correspondingly high efficiency.

The low-side power MOSFET has an on-resistance (RDS (on)) of 3.7 mOhm (typ.: at 4.5 V) to reduce power loss. In addition, a Schottky barrier diode (SBD) is integrated on the same chip as the low-side power MOSFET to minimize the wiring inductance between them. This speeds up the switch of current flow to the Schottky barrier diode during the DC/DC converter's dead time, further reducing loss. It also has the effect of suppressing voltage spikes during switching, thereby reducing noise. The RJK0383DPA will be followed by two additional products having different output current ratings, the RJK0384DPA and RJK0389DPA. In future more products suitable for other DC/DC converter power supply specifications will be added to the series in response to the needs of the market.

While many portable systems, such as wireless data cards, need a typical 3.3V source to power a processor, memory or I/O plus a lower voltage source to power noise-sensitive circuits, it is very difficult to support all those functions while achieving high efficiency, using a single PMIC. By combining two buck converters with a low input voltage used to post-regulate the second buck converter, AnalogicTech’s AAT2782 and AAT2783 extend battery life and reduce board footprint by powering both standard and the lower voltage noise sensitive circuits while maintaining high power efficiency.

The AAT2782 and AAT2783 are power management ICs (PMICs) for portable applications. The devices can be used to power both traditional power management functions and noise-sensitive circuits without compromising power efficiency. The AAT2782 and AAT2783 operate off a 2.7V to 5.5V input range and provide three independently regulated DC outputs: two step-down converters and one low input voltage LDO. The two step-down converters on the AAT2782 deliver 1200mA and 600mA respectively, while the AAT2783 delivers 1000mA and 400mA. Both converters use current mode control to ensure fast transient response and stable operation across the entire operating range.

A 1.3MHz switching frequency supports the use of small external filters. The low input voltage LDO is optimized for low noise operation. Designed to operate off a 1.7V input, the LDO delivers up to 400mA with a -80 dB power supply rejection ratio (PSRR) and 65 microVRMS output noise with an optional bypass capacitor. The LDO’s output voltage is factory set at 1.2V. When using the LDO to post-regulate the output of the second step-down converter to produce low-noise operation, both the AAT2782 and AAT2783 achieve efficiency levels up to 80 percent. Total quiescent current is 170 micro A for the AAT2782 and 135 micro A for the AAT2783. Both devices feature 200 micro s internal soft start and over-temperature protection. The AAT2782 and the AAT2783 are fabricated in AnalogicTech’s proprietary ModularBCD process.

Compared to linear-IC legacy fabs and generic digital CMOS foundries, ModularBCD provides more cost-effective, modular fabrication of analogue, power and mixed-signal ICs by monolithically integrating fully-isolated CMOS at multiple voltages, complementary bipolar transistors, and robust power devices. This process avoids complex and expensive techniques such as epitaxy and high-temperature diffusion. Devices manufactured in ModularBCD offer higher efficiency, smaller size and higher levels of integration than those fabricated in many other processes. Qualified across the -40 C to +85 degrees C temperature range, the AAT2782 and AAT2783 are available in a Pb-free, 16-pin, TDFN package.

By introducing the new WLAN-BRIDGE-WAVE Weidmüller is extending its portfolio comprising the WaveLine family of products with a WLAN-Bridge for IE networks. Weidmüller developed the WaveLine Bridge module so that serial terminal devices can be integrated in existing IE network structures. WaveLine now also allows users to utilise WLAN to connect or extend their industrial network. The compact design size for mounting rail solutions is a compelling feature. Supporting wireless LAN (IEEE 802.11 b, 802.11 g) the module IE-WLAN-BRIDGE-WAVE comes with a non-isolated RS232 interface. For user-friendly operation the module can be configured via the serial interface or a web interface – including a password-protected configuration environment.

The WLAN-BRIDGE-WAVE boasts an integrated internal web server and has an extensive range of designed-in security mechanisms. The product family WaveLine can now link or extend industrial networks by utilising WLAN functionality. It is a simple fact that wireless LAN can today not only be utilised anywhere where cabling does not provide an effective solution or a mobile network termination is required but also in production facilities and plant. The WaveLine WLAN-Bridge offers a suitable platform from which to gain a foothold in the world of Industrial Ethernet or it can be utilised to provide a simple method of connecting terminal devices to IE networks.

The industrial-grade WLAN-BRIDGE-WAVE (degree of protection IP20) is supplied in a compactly designed plastic housing (108 mm x 22.5 mm x 127.8 mm L/W/H), flammability class VO, and can be utilised in operating temperatures ranging from 0 °C to 55 °C. Supporting the WLAN standards IEEE 802.11b/g the module facilitates disturbance free operations in production facilities. And not to forget a 10 Base-T/100 Base-TX (copper) network interface. Integrated in the WLAN-Bridge ex works are: a (non-isolated) RS232 port and an RJ45 port as well as an antenna. Besides the functions autonegotiation and autocrossing (RJ45) the WLAN module is also equipped with a redundant power supply. Extensive security measures have been designed into the WLAN Bridge: optional end-to-end 128, 192 or 256 bit AES encryption, WPA-PSK/ TKIP and alternatively 64/128 bit WEP/WPA2 encryption.

User-friendly configuration is assured via the serial interface or the web interface, which offers a pass-word protected configuration environment. As well as being suitable for installing on mounting rails the slimly designed WLAN-Bridge module features an integrated web server. The module supports the following protocols: ARP, UDP, TCP, Telnet, ICMP, SNMP, DHCP, BOOTP, Auto IP, HTTP, SMTP, TFT. Three LEDs indicate the module is operating correctly: Data Rate, Power, Connection/Activity.

With their new ‘Web-Alarm’ W&T offers a Web-based alarm control centre with data logger.

This compact unit features six inputs including counter for any sensors having digital outputs. If needed, local alarms can be connected using six digital outputs. The digital inputs can also be used for acknowledgement directly on the unit.

The integrated Web server includes the complete management software for monitoring and controlling the alarms. The software runs in any Web browser, from PC to smartphone, without separate installation or additional plug-ins. Self-updating, it visualizes the current alarm status and also provides the option of acknowledging current alarms.

In addition, it provides tools — again in the browser — for reading the data logger and displaying alarm and signal histories.

Once connected to a network and assigned an IP address and subnet mask, all the device settings and alarm configurations can be made by any computer in the network using the integrated Web-based management.

The network connection permits sending of messages via e-mail, SNMP trap, Syslog message, FTP upload and TCP or UDP client message.

In addition to the messaging features and fully integrated software, the Web-Alarm — at only 398.00 euro — offers and internal data logger.

This stores all I/O, counter and alarm events. Along with browser display, the contents of the data logger can also be exported to a CSV file for further processing or archiving

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