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Micrel power switches with Kickstart current limiting feature

Posted: 05 Sep 2005 ?? ?Print Version ?Bookmark and Share

Keywords:micrel? protected power switch? mic2014? mic2015? mic2016?

Micrel Inc. expanded its family of high-current protected power switches with the release of the MIC2014/15/16 chips. Featuring kickstart current limiting that promises a new level of adaptability to peripheral power management, the new power distribution switches are aimed at applications requiring current limiting as protection against short circuits, including PCs, STBs, game controllers and USB host devices.

"The advent of portable mass storage devices has changed the peripheral power landscape," said Scott Brown, director of mixed-signal and RF products at Micrel. "Micrel's new family of high-side power switches is designed to act intelligently in these situations."

The MIC2014/15/16 all feature Kickstart current limiting. These ICs offer 70 milliohm typical on-resistance, fault flagging and slew rate controlall in one of the smallest form factors available on the market today. These switches are capable of serving multiple (USB) ports to provide both cost and space savings. Standard features include a 2.5V to 5.5V operating range, output Enable control input, thermal protection, under voltage lock-out, low quiescent current and fault masking that prevents nuisance alarms on current surges or hot plug events.

Kickstart feature

According to Micrel, its Kickstart feature enables current limit protection for a wide variety of devices. Many consumer devices now require an initial burst of power, well above their steady state operating level, to get up and running. In turn, this initial surge presents a problem to standard current limiting switches because they are designed to restrict these sudden surges in current. Their response is incompatible with the peripheral's needs.

"The Kickstart feature permits momentary high-current surges to pass through the switch unrestricted, thereby feeding the device the burst of power it needs. The result is trouble free peripheral operation without any sacrifice in overall system safety," Brown said.

The MIC2014/15/16 are available in two package options: SOT-23 and 2-by-2mm MLF. Pricing starts at 75 cents for SOT-23 and 85 cents for MLF, both in 1,000-unit orders.

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