Smart switch targets multi-powered handheld devices

8th May 2015

Micrel, Inc.

Siobhan O'Gorman

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Datasheet

Targeting handheld devices and systems powered from multiple sources such as wall adapters and auxiliary batteries, the MIC1344 3A power ORing smart switch has been introduced by Micrel. The device, which is offered in a 12-pin, 2x2mm QFN package, is also suitable for applications that require a diode OR function between two input power sources.

The switch provides a power ORing for two power sources from 2.8 to 5.5V. Using very low-on resistance power MOSFETs which serve as monolithic ORing diodes, the MIC1344 connects either input A or input B to the output.

The power MOSFETs drop significantly less forward voltage than diodes and help conserve power while increasing voltage headroom, which is critical for low voltage battery equipped systems. Key protection features include output-to-input and input-to-input current blocking, and built in thermal shutdown. Fully specified from -40 to +125°C, is available now, priced from $2.33 and sold in 1,000-piece quantities.

“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," said Brian Hedayati, Vice President, Marketing for High Performance Linear and Power Solutions, Micrel. "To increase design flexibility the device also offers programmable current-limit for each channel, automatic or manual input selection and four status outputs."