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Digital power controllers serve communications and computing

San Jose, Calif.—Fairchild Semiconductor's FD2004, FD2004-01, and FD2006, the company's first point-of-load digital power controllers for communications and computing applications, combine digital loop control and highly integrated power management capabilities.

Incorporating a Digital-DC power conversion architecture that's derived from the Fairchild-Zilker partnership, the controllers claim an improvement in full-load efficiency of up to three percent and a light-load efficiency increase of greater than 15 percent in typical applications in helping to address the Energy Star and Climate Savers Computing efficiency guidelines.

The FD2004/6 products, along with the company's FD1505 digital power support driver, are universal power building blocks. The controllers are rated for operation over a 3-14 volt input range to control an output from 0.54 to 5.5 volts. These devices can be connected in parallel.

The FD2006 integrates a controller with 3-amp MOSFET drivers that support loads in excess of 40 amps; no external driver is required. The controller-only FD2004 interfaces with external driver/MOSFET ICs and power train modules. The FD2004-1 is a controller-only solution and touts the industry's best DC output voltage setpoint accuracy: ±0.2 percent. All of these controllers include on-board I2 C/SMBus compliant serial ports and support the industry-standard PMBus command set.

The FD1505 is a high-speed, high-current synchronous n-channel MOSFET driver for synchronous-buck applications. It has dual PWM inputs that take advantage of the dynamic dead-time optimization provided by the FD2004 and FD2004-01. The devices combine +5A/-4A low-side drive with ±3A high-side drive and up to 7.5V gate drive supply input to enable high efficiency at high step-down ratios.

The FD1505 also provides an adjustable gate-drive current feature that allows configuration of 50 percent or 100 percent of its full rated drive current.

Pricing and availability : The Digital-DC controllers, in 5-by-5 mm, 32-lead QFN and 6-by-6 mm, 36-lead QFN packages, are priced starting at $2.95 each in 1k pieces. The FD1505, in a 3-by-3 mm DFN, is priced starting at 71 cents. The devices will sample in October.

Fairchild Semiconductor , www.fairchildsemi.com/digitalpower

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