DC-DC Controller has adjustable output.

Press Release Summary:




FAN5250 accepts input voltages from input sources, including
ac wall brick adapters and battery packs ranging from 5 to 24 V. Unit performs synchronous conversion to provide over 5 A loads in typical applications. Output is adjustable by a 5-bit VID DAC between 0.6 and 1.75 V, using a low-drift onboard reference with accuracy of better than 1%. FAN5250 is available in a 24-pin QSOP package, supplied in either tube or tape-and-reel packing.



Original Press Release:



PWM REGULATOR PREFERRED BY TRANSMETA FOR CRUSOE NOTEBOOK PROCESSORS



San Jose, Calif.-December 3, 2001- 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 ISL62 11, 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.

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