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Controller tailored for POL regulators

Posted: 02 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:IR3624? controller IC? pulse-width modulation? International Rectifier?

IR3624 PWM controller IC

International Rectifier (IR) introduced the IR3624, a 600kHz single-phase synchronous buck pulse-width modulation controller IC designed for high density, 10A non-isolated point-of-load (POL) regulators used in networking and communications systems. The 600kHz switching frequency enables the use of a reduced footprint inductor and fewer output capacitors, IR said.

"The combination of the IR3624 with two small-can DirectFET MOSFETs allows designers to achieve twice the power density of previous solutions by reducing solution footprint by 45 percent," said Stephen Tsang, senior vice president of Asia sales at IR.

The product has integrated thermal shutdown and programmable overcurrent limit protection. It includes a 0.6V voltage reference, which allows a POL regulator to support applications from ultra low-voltage DSPs to legacy 5V logic.

IR also said that for applications below 5A, even higher density can be achieved by using one SO-8 dual N-channel HEXFET MOSFET to replace the two stand-alone MOSFETs and shrink the board area to within 150mm2.

To meet the tracking requirements of ASICs and FPGAs during start-up, the IR3624 can start-up with a pre-biased output voltage without discharging the output. This feature is said to simplify regulator design for both the core and I/O voltages.

Pricing for both the IR3624MPbF and the IR3624MTRPbF is 85 cents each in 10,000-unit quantities, and are available either in tubes or tape-and-reel. Prices are subject to change. The devices are lead-free and are RoHS compliant.

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