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Micro DC/DC converter operates from 1.8-6V

Posted: 03 May 2012 ?? ?Print Version ?Bookmark and Share

Keywords:step-down converter? voltage regulator? RF circuit?

Torex Semiconductor Ltd has introduced a set of 400mA micro DC/DC step-down converters with integrated coil. According to the company, the XCL208/XCL209 series is designed to minimize EMC emissions and maximize efficiency, while delivering a very stable output with low peak to peak ripple voltage (less than 10mV).

Operating from input voltages from 1.8-6V, the XCL208/XCL209 is ideal for RF circuits and applications where PCB space is at a premium, said Torex. Internally the XCL uses a simple package construction with low production costs resulting in a truly cost effective solution for high volume consumer applications, noted the company.


The micro DC/DC converters boast 3MHz switching frequency.

Radiated noise or EMC is a constant concern for many electronic design engineers. The XCL208/XCL209 has been designed to minimize this unwanted noise, making it ideal for sensitive applications, said the company. When tested and compared with a conventional DC/DC circuit with an external coil, the XCL208/XCL209, with its integrated coil, shows a significant reduction in radiated noise achieved across all frequency bands, Torex stated.

The small size and simple circuit architecture makes the XCL208/XCL209 an ideal replacement for inefficient LDO voltage regulators and by integrating the coil, Torex said it has simplified the circuit layout for the designer and reduced the number of external components normally needed to implement this type of DC/DC solution. The smaller circuit layout also means less PCB tracking that helps further reduce the radiated noise.

The output voltage can be fixed internally within a range of 0.8-4V in 50mV steps (accuracy: 2%) or adjusted externally between 0.8V and VIN by using two external resistors. Both measuring 2.5 x 2.15 x 1.05mm, the XCL208 operates with fixed frequency PWM control, whereas the XCL209 has automatic PWM/PFM switching control providing fast response, low ripple and high efficiency over the full range of load conditions.

The switching frequency is 3MHz (15%) and the XCL208/XCL209 is readily available in the USP-10B03 package. A fully populated EVB can be provided upon request.

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