Torex - Synchronous step-down DC-DC converters

10th August 2009

ES Admin

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The XCL205/206/207 series are 600mA, 3MHz synchronous step-down DC-DC converters with integrated coil. The whole solution, including 1.5uH coil, measures only 2.5mm x 2.0mm and has a package profile of only 1.0mm making it one of the smallest solutions of its kind on the market today. Requiring only 2 external ceramic capacitors to configure a step-down circuit capable of providing efficiencies in excess of 85%, the XCL205/206/207 is ideally suited for applications that require high efficiency plus low output noise in an extremely small PCB area.

What makes the XCL205/206/207 stand out from the competition is the technology used to bring the IC and the coil together in one package. Existing solutions tend to use conventional packaging techniques where the DC/DC die is placed along side a coil in a moulded package. Torex have developed a unique system with their coil partner that actually places the thin-film power inductor around the converter, a process similar to stacking, thereby enabling ultra small, all in one solutions to be realised ! The XCL205/206/207 is the first generation of such solutions.

The XCL205/206/207 device has an input voltage range of 2.0V to 6.0V and can deliver output voltages from 0.8V to 4.0V (+/-2%). Control is PWM (XCL205), PWM/PFM Automatic (XCL206) or user selectable between either fixed PWM or PWM/PFM automatic switching (XCL207).

The XCL205/206/207 B and C types feature an auto CL discharge function. In addition, the B type also has a high speed soft-start function (0.25ms typ. compared to 0.9ms typ. with the XCL205/206/207 A and C types). All versions feature a built-in current limiter (constant current and latching) and short circuit protection. A CE pin enables the device to be put into stand-by thereby reducing current consumption from an already low 21uA typ. in operation to less than 1.0uA in stand-by.

More in depth information about the XCL205/206/207 step-down DC-DC converter with integrated coil can be found directly on Torex Semiconductor’s website at: www.torex-europe.com/xcl