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Buck regulator powers systems from 3.3-5V supply rails

Posted: 05 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:synchronous buck regulator? DSPs? power density?

Micrel Inc. has introduced a new member to its high-power-density family of products: A fully-integrated 4A synchronous buck regulator, the MIC22400, intended for powering systems from 3.3V and 5V supply rails.

With operating frequency programmable from 800KHz to 4MHz, the IC features built-in sequencing, tracking and ramp controlenabling all power-up sequencing and tracking protocols. Targeted at the communications, computing peripherals, and high-end consumer markets, the solution is well suited for servers/routers, HD DVD recorders, wireless base stations, FPGAs, DSPs and low-voltage ASICs, as well as other high power density applications.

"Ease-of-use, small size, high efficiency and high integration are key drivers for today's demanding power designs ," said Andrew Cowell, Micrel's VP of marketing for analog products. "The MIC22400 delivers 4A at high efficiency while setting new standards in terms of small footprint and increased functionality."

The MIC22400 features fully integrated 60m P-FET and 35m? N-FET switches that deliver a 4A output current with an input voltage range of 2.6-5.5V. The device has an adjustable output voltage down to 0.7V and provides efficiencies of up to 95 percent. A proprietary, patent?pending internal compensation scheme makes the devices extremely easy to use. The MIC22400 requires very few external components and operates at a high fixed switching frequency, which in turn, reduces the size of passive components. The built-in sequencing/tracking feature enables reliable power up/down in multirail ASIC/FPGA applications. The device also offers an ultrafast transient response, allowing the use of small output capacitors, and thermal shutdown, current limit protection and a junction operating range from -40C to 125C. The chip is available in a 20-pin 4mm x 3mm MLF, with a thermally-enhanced Epad TSSOP expected to be available by end of Q1.

The MIC22400 is currently available in volume quantities with pricing starting at $2.54 for 1,000 quantities.

Micrel is one of the exhibitors at the 13th IIC-China 2008.

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