Programmable buck regulators

1 May 2013 Power Electronics / Power Management

Vicor announced 14 new additions to its PI33XX Picor Cool-Power ZVS buck regulator product line for high-efficiency point-of-load (POL) DC-DC regulation. This product line extension includes higher-current devices and optional I²C fault telemetry and programmability.

The integration of a high-performance zero-voltage switching (ZVS) topology enhances point-of-load performance, providing elevated power efficiency for wide Vin operation. This topology enables high power density and high-frequency operation that maximises efficiency by minimising the significant switching losses associated with conventional hard-switching buck regulators.

The products are designed to convert 8 V to 36 V inputs to high-current, low-voltage POL system rails such as 3,3 V, 2,5 V, 1,8 V and 1 V. They can support conversions with large step-down ratios up to the rated input voltage of 36 V, enabling system designers to deploy more efficient power distribution schemes that rely on a higher input voltage source.

All products in the PI33XX series are highly integrated with control circuitry, power semiconductors and support components in a high-density 10 x 14 x 2,56 mm LGA System-in-Package (SiP). Power delivery can be further increased by interleaving multiple Cool-Power ZVS buck regulators using single-wire current sharing without the need for any additional components.

The regulators require only an external inductor and minimal ceramic capacitors for input and output filtering to form a complete high-performance regulator. No frequency compensation, parametric settings or incremental external components are required.

For designers challenged by complex distribution power schemes, the devices offer an optional I²C extended fault telemetry capability allowing for six distinct types of fault reporting. Additional device-programmable I²C features include output margining, enable pin and synchronisation pin logic polarity, and phase delay. Device programming is easily performed via the Cool-Power Development Tool.

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