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Micro DC/DC converters come with integrated coil

Posted: 12 Jun 2009 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? integrated coil? transistor?

Torex Semiconductor Ltd is offering a new step-down micro DC/DC converters with integrated coil, measuring 2.5mm x 2mm and a height of only 1mm.

By simply adding two external ceramic capacitors to the DC/DC converter, a power supply with a maximum load current of 600mA can be configured. The operating voltage is 2V to 6V. The output voltage is fixed and can be selected within the range 0.8V to 4V in steps of 0.05V. The control IC operates at a switching frequency of 3MHz and performs synchronous rectification using a built-in 0.42? p-channel driver transistor and a built-in 0.52? n-channel switching transistor. The operation mode can be selected from three types: PWM control (XCL205), PWM/PFM automatic switching control (XCL206), and manual control switching (XCL207). A high-speed response, low ripple, and high efficiency are achieved over the full load range from light loads to heavy loads, and the quiescent current is reduced to 1.0 ?A or less by shutting down all circuits during standby.

The built-in under voltage lock out function forcibly turns off the internal driver transistor when the input voltage is 1.4V or less.

The XCL205B/XCL206B/XCL207B series has as a high-speed soft-start function, 0.25ms (typ.) The XCL205B(C) /XCL206 B(C) / XCL207B(C) series discharges the charge of the load capacitor CL, by turning on the internal switch during standby using the CL discharge function. This makes it possible to quickly return the output voltage to the VSS level.

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