Power

'Micro' DC/DC converters operate at 105°C

13th July 2015
Siobhan O'Gorman
0

Two series of step-down DC/DC converters with a 500mA integrated coil and control IC have been released by Torex Semiconductor. Supporting an ambient operating temperature of 105°C, the XCL221 and XCL222 series of ‘micro' DC/DC converters are suitable for applications such as wireless devices, wearable devices that require high efficiency.

Because a power circuit can be configured by simply adding two ceramic capacitors to the external components, the devices contribute to space-saving on the board and shortening of development time. The integrated coil simplifies the board layout and minimises unwanted radiation noise and circuit operating trouble.

The operating voltage range is 2.5-5.5V, and the output voltage is selectable in the range 0.8-3.6V in steps of 0.05V. A low switching frequency of 1.2MHz realises low noise. PWM control (XCL221) or PWM/PFM auto switching control (XCL222) can be selected for the control method.

The XCL221/XCL222 series uses HiSAT-COT, which is suitable for wireless and wearable devices that require a fast transient response and portable devices and GPS watches that incorporate a CPU.

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