PWM control IC takes drivers onboard

International Rectifier has launched a three-phase PWM control IC with integrated drivers for DC/DC convertors.

International Rectifier has launched a three-phase PWM control IC with integrated drivers for DC/DC convertors.

The IR3094MPbF enables up to 40% circuit size reduction when used with International Rectifier DirectFET MOSFETs.

The smaller footprint makes the IR3094 ideal for space-constrained applications like DDR memory in rack servers and point-of-load (POL) modules used in high-density data systems.

A typical 80A, three-phase synchronous buck solution would require as many as 13 devices including one control and three drivers in addition to three MOSFETs per phase.

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 minimises printed circuit board trace parasitics and enables optimum switching performance.

The IR3094 is designed for applications requiring a 0.85 to 5.1V output.

The new IC is housed in a compact 7 x 7mm MLPQ package, and features 3A gate drive capability, a 1% 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 IRF6678, an ideal synchronous MOSFET, features a very low typical device on-resistance of 1.7mohm at 10V and 2.3mohm at 4.5V.

The IRF6637 is best suited as a control MOSFET, with very low Miller charge of only 4nC and typical device on-resistance of 5.7mohm at 10V and 8.2mohm at 4.5VGS.

Both MOSFETs are housed in the medium can DirectFET package, occupying the same board area as a SO-8 with only a 0.7mm profile, and improved thermal performance through double-sided cooling.

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