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Smart switch reduces heat in handheld devices

Posted: 11 May 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Power switch? ORing switch? mobile charging?

Power and communications solutions provider Micrel unveiled the MIC1344, a 3A power ORing smart switch designed for handheld devices such as wall adapters and auxiliary battery power sources. The MIC1344 is ideal for applications that require a diode OR function between two input power sources.

"The MIC1344 power ORing switch is designed to reduce heat by minimising voltage drop across the power switch. It saves valuable board space which remains crucial in the design of mobile devices," noted Brian Hedayati, vice president of marketing for high performance linear and power solutions at Micrel. "To increase design flexibility the device also offers programmable current-limit for each channel, automatic or manual input selection and four status outputs."

The device provides a power ORing for two power sources from 2.8V to 5.5V. The MIC1344 connects either input A or input B to the output using very low-on resistance power MOSFETs. The power MOSFETs serve as monolithic ORing diodes, dropping significantly less forward voltage than diodes and help conserve power while increasing voltage headroom which is critical for low voltage battery equipped systems. The MIC1344 features output-to-input and input-to-input current blocking and built-in thermal shutdown, as well as an operating temperature from -40C to 125C.

Available in a 2mm x 2mm QFN package, the MIC1344 is available in volume quantity with 1,000 quantities pricing starting at $2.33.





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