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PWM control IC with integrated drivers

Posted: 14 Dec 2005 ?? ?Print Version ?Bookmark and Share

Keywords:International Rectifier? IR? PWM control IC? DC/DC converter? IR3094MPbF?

IR3094 PWM control IC

International Rectifier (IR) introduced a three-phase PWM control IC with integrated drivers for DC/DC converters. The new IR3094MPbF enables up to 40 percent circuit size reduction when used with IR's DirectFET MOSFETs. The smaller footprint makes the IR3094 suited for space-constrained applications like DDR memory in rack servers and point-of-load (POL) modules used in high-density data systems.

According to the press release, a chipset made with the IR3094 plus IRF6637 and IRF6678 DirectFET MOSFETs reduces the silicon component count to seven devices for the same output current. Three pairs of these DirectFET MOSFETs can be placed directly next to the IR3094, creating a solution that minimizes PCB trace parasitics and enables optimum switching performance.

"The IR3094 enables 80A POL regulators that take up less than two square inches of board space," said Stephen Tsang, SVP of sales at IR. "This is critical as OEMs continue to push for increased density and functionality in next generation servers."

The IRF6678 features a low typical device on-resistance of 1.7 m? at 10VGS and 2.3 m? at 4.5VGS. This device is designed as a control MOSFET, with low Miller charge of 4nC and typical device on-resistance of 5.7 m? at 10VGS and 8.2 m? at 4.5VGS. Both MOSFETs are housed in the medium can DirectFET package, occupying the same board area as a SO-8 with a 0.7mm profile, and improved thermal performance through double-sided cooling.

The IR3094 is designed for applications requiring a 0.85V to 5.1V output. This new IC is housed in a compact 7-by-7mm MLPQ package, and features 3A gate drive capability, a 1 percent accurate reference voltage, adaptive voltage positioning and programmable switching frequency up to 540kHz. The IR3094 provides system protection with programmable soft start, hiccup over-current protection, over-voltage protection and a "power good" indicator, the company said.

The new IR3094MPbF PWM controller IC and the companion DirectFET MOSFETs are already available. Pricing is $2.34, $1.25 and 91 cents each for the IR3094, IRF6678 and IRF6637, respectively. All pricing is in 10,000-unit quantities, and is subject to change.

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