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Power/Alternative Energy  

New power switches from Micrel

Posted: 09 Nov 2005     Print Version  Bookmark and Share

Keywords:micrel  power switch  mic2007  mic2008  mic2009 

Micrel Inc. rolled out six new additions to its family of high-current power switches, the MIC2007/08/09 and the MIC2017/18/19. The MIC2007/08/09 feature adjustable current limiting, while the MIC2017/18/19 offer both adjustable current capability and Kickstart, a new feature that handles high current surge devices without the stalling or stuttering caused by standard current limiting devices.

The new chips are aimed at PCs, STBs, docking stations, game controllers and USB host devices where current limiting as protection against excessive loads and short circuits is required. "As an ever increasing number of products add USB functionality, designers are requiring more flexibility in their power management system," shared Bob Whelton, EVP of operations at Micrel. "The new MIC20xx series increases the number of options for designers and gives them the head room they require for increasingly unpredictable power demands in USB devices."

The MIC2007/08/09 and MIC2017/18/19 feature one of the industry's highest power-to-footprint ratio—0.5A/mm². In addition, these ICs are among the first to offer adjustable current limiting, up to 2A, in such small packages.

Adjustable current limiting allows the customer to set a limit of his or her own choosing rather than choosing from a list of pre-set factory limits. Adjustability also helps inventory control as, with adjustable current capability, one IC can easily address the power needs of many designs.

The ICs all offer 100-milliohm maximum on-resistance and an adjustable current limit. These devices are capable of serving multiple (USB) ports which provides 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, which prevents nuisance alarms on current surges or hot plug events.

The MIC2007/08/09 and the MIC2017/18/19 are available in volume quantities and in two package options: SOT-23 and 2-by-2mm MLF. Pricing starts at 69 cents for SOT-23 and 80 cents for MLF packaging, both in 1,000-unit orders.



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