Bullet Sensors & Transducers e-Digest, Vol. 130, Issue 7, July 2011: Product News

    (ISSN 1726-5479)

 

 

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Fully Integrated DC/DC Converter for Intelligent Sensor Systems

 

 

From just one chip and a variable input voltage of 4 V to 36 V iC-DC generates two stabilized output voltages that can be adjusted between 1.5 V and 5.5 V for the compact voltage supply of industrial sensors and small subsystems. The combination of switching converter plus two back-end linear regulators minimizes the amount of space required for the power pack and achieves a good residual ripple of typically 10 mVpp ideal for the supply of precision analog circuits.

 

The buck/boost switching converter technology used here makes any distinction between devices supplied with 5 V or 1030 V unnecessary, as a steady +5 V supply is provided for sensor electronics, for example. The two independently adjustable output voltages Vcc1 and Vcc2 can provide a total of 300 mA and supply digital and analog circuit components separately.

 

The switching converter typically operates at 3 MHz, thus reducing the size of the external coil to approx. 2 mm x 2 mm and that of the external back-up capacitors to a few microfarads while adhering to the EMC requirement for industrial sensors. iC-DC has been optimized for intelligent sensor systems and subsystems, such as:

  • Incremental and absolute encoders

  • Linear measuring systems

  • Bus-compatible sensors and hubs (e.g. I/O links)

  • Decentralized industrial subsystems

  • Split voltage supplies in controllers and drives.

The circuit monitors both the chip temperature and the input and output voltages. iCDC signals faults using separate diagnostic outputs configured as open collectors. Both output voltages can be switched on and off separately. Once the set voltage has been reached, a Power OK signal is generated at V1OK/V2OK. The integrated autarky function enables an additional capacitor to provide a buffered energy supply should the input voltage fail, allowing a microcontroller to perform a data backup.

 

iC-DC comes in a tiny 4 mm x 4 mm DFN10 package with a thermal pad on the reverse for improved thermal dissipation. The device operates within an operating temperature range of -40C to 125C and protects itself against overload with an overtemperature shutdown feature. An iC-DC EVAL DC1D evaluation board is also available as a reference design, saving time during test configuration.

Further information is available at http://www.ichaus.com/product/iC-DC

 

 

Introducing iC-Haus

 

iC-Haus GmbH is a leading independent German manufacturer of standard iCs (ASSP) and customized ASiC semiconductor solutions. The company has been active in the design, production, and sales of application-specific iCs for industrial, automotive, and medical technology for over 25 years and is represented worldwide. The iC-Haus cell libraries in CMOS, bipolar, and BCD technologies are fully equipped to realize the design of sensor, laser/opto, and actuator ASiCs. The iCs are assembled in standard plastic packages or using iC-Haus chip-on-board technology to manufacture complete microsystems, multichip modules, and optoBGATM, the latter in conjunction with sensors. Further information is available at www.ichaus.com

 

 

 

 

Contact:

 

Magnus Meier

iC-Haus GmbH,

Am Kuemmerling 18,

55294 Bodenheim, Germany

E-mail: magnus.meier@ichaus.com

Web: http://www.ichaus.com

Integrated DC/DC Converter

 

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