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Fairchild PWM controllers suit AMD processors

Posted: 08 May 2002 ?? ?Print Version ?Bookmark and Share

Keywords:fan5240? athlon 4? duron? powernow? pwm controller?

Fairchild Semiconductor has announced the release of the FAN5240 two-phase PWM controller to meet the core power requirements of AMD's Athlon 4 and mobile Duron processors.

The synchronous buck controller provides a 5-bit DAC with a controllable slew rate that adjusts the core PWM voltage from 0.925V to 2V, to meet the AMD's PowerNow specification.

The FAN5240 includes a precision reference and a proprietary architecture with integrated compensation to provide static and dynamic core voltage regulation. The regulator includes special circuitry which balances the two-phase currents for maximum efficiency.

At light loads, when the filter inductor current becomes discontinuous, the controller operates in a hysteretic mode, to improve system efficiency. The hysteretic mode of operation can be inhibited by the FPWM control pin.

The IC implements all required protection and monitoring functions, such as programmable current limiting utilizing lossless power MOSFET sensing. Other protection features include a precision sense resistor, shutdown control, overvoltage protection, programmable soft start, thermal limiting, undervoltage lockout and a power good output.

The FAN5240 is available in 28-lead QSOP and TSSOP packages and is rated for operation over the -100C to 850C range. Pricing starts at $2.97 each for 1,000-unit quantities.

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