PWM Regulator Preferred by Transmeta for Crusoe Notebook Processors

Fairchild Semiconductor International (NYSE:FCS) introduces the feature-packed FAN5250, a DC-DC controller designed in conjunction with Transmeta Systems engineers to meet the requirements of the popular T5500 and T5800 Crusoe processors in Notebook computers. Accepting input voltages from input sources, including AC wall brick adapters and battery packs ranging from 5V to 24V, the FAN5250 performs synchronous conversion to provide over 5A loads in typical applications. The FAN5250's output is adjustable by a 5-bit VID DAC between 0.6V and 1.75V, using a low-drift onboard reference with accuracy of better than 1%. With user-controllable PWM and Hysteretic operation, as well as analog controls for Transmeta-specified Start and Deep Sleep Extension (DSX) modes, the FAN5250 is optimized to maximize power consumption and to support Transmeta LongRun(tm) Technology. The FAN5250 is second-sourced by the Intersil ISL6211, which is pin and functionally equivalent.

The FAN5250 also features integrated high-current drivers for the external power MOSFETs, thus reducing overall parts count and increasing reliability. A programmable soft-start control reduces inrush current and output overshoot at startup, which minimizes stress on surrounding components. Safety features include low-cost current limiting power MOSFET RDS(on) characteristics, over-voltage protection, and under-voltage lockout (UVLO). The FAN5250 is available in a compact 24-pin QSOP package, supplied in either tube or tape-and-reel packing.

Price: FAN5250QSC US $2.99 (1,000pcs)

Availability: Evaluation samples available now

Delivery: 7-8 weeks ARO

Fairchild Semiconductor, RF Power Group, 82 Running Hill Road, South Portland, ME 04106. Tel: 207-775-8100; Fax: 207-761-6139.