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Power controller features dynamic phase dropping

Torrance, Calif.—Primarion has started to sample the PX3664, a digital multi-phase power controller with dynamic phasing for synchronous DC/DC buck converters in computing and communications applications.

According to Primarion, the PX3664 improves overall system efficiency across the entire operating load range with its autonomous phase dropping/adding capability. With up to four phases, each capable of up to 2 MHz operation, the PX3664 can be used to build DC-DC converters that provide up to 120A, low ripple, low component count and high efficiency across the entire operating range. Interleaved timing of the phases results in a higher ripple frequency, reducing input and output capacitors, the company said.

The PX3664's dynamic phasing capability allows the system to shed one or more phases based on the user defined average current. The autonomous phase feature drops phases when the average current falls below a specified threshold, and adds phases when the average current is above the threshold. The dropping of phases at lighter loads increases the efficiency by several percentage points and reduces the cost of power over the life of the product. The PX3664's autonomous loop optimization makes it possible to meet the transient and ripple requirements, while operating at the lower phases.

The PX3664 uses two bits via PD1 and PD2 or a I²C-bus serial interface to control and monitor phase dropping. The interface also allows the power supply designer to monitor real time system performance.

The PX3664 is supported with an intuitive and user-friendly graphical user interface (GUI). The GUI takes the designer step-by-step through the process of debugging and modifying the power system design.

The PX3664 is available in a RoHS-compliant, 7mm-x-7mm 48-lead QFN package.

Primarion, 1 (866) 321-7746, www.primarion.com

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