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Micrel high-current power switches offer cost, space savings

Posted: 16 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:micrel? power switch? switch? mic2004? mic2005?

Micrel Inc. launched a family of high-current power switches that are designed for PCs, STBs, game controllers and USB host devices, including the market's latest printers which all require current limiting as protection against short circuits.

"All PCs and millions of printers feature USB sockets as the standard connection for peripherals and each requires current limiting as protection against short circuits, " explained Scott Brown, director of Mixed-Signal and RF Products at Micrel. "Our newest family of power distribution switches offers the industry's highest current rating to footprint ratio and an unparalleled feature set, making them ideal for these applications."

The MIC2004, MIC2005 and MIC2006 chips all feature preset current limits of 0.5A, 0.8A and 1.2A in one of the smallest form factors available on the market today. These single output ICs are capable of serving multiple (USB) ports providing both cost and space savings. Standard features include soft-start turn-ON, thermal protection and an Enable input for eternal switch control.

The MIC2004 offers a Load Discharge FET to insure output capacitors retain no charge when the switch is OFF; the MIC2005 features user-adjustable soft-start to create glitch free turn-ON for power supplies ranging from strong to delicate, and a Fault flag for indication of over-current or over-temperature events with fault blanking to prevent nuisance alerts on transient; and the MIC2006 offers Dynamic Load Management (DLM), a new feature that provides a dynamic current limit in addition to the factory pre-set limit. DLM monitors the source supply for weaknesses and will disable its load if the source voltage drops below a user-defined threshold. This creates a moving current limit which dynamically adjusts itself according to system-wide conditions, explained Micrel.

"The MIC2004/5/6 all offer an innovative feature set, high current ratings and packaging options that give designers the design flexibility and increased functionality they require for space constrained, cost-conscious consumer products," added Bob Whelton, executive vice president of Operations, Micrel.

Available in volume quantities, the new switches are offered in two package optionsSOT-23 and 2-by-2mm MLF. Pricing starts at 54 cents for SOT-23 and 58 cents for MLF, both for 1,000-unit quantities.

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