FAN5250

www.fairchildsemi.com FAN5250 Mobile Processor Core-Voltage Regulator Features High efficiency over wide load range Non dissipative current-sense; uses MOSFET RDS(ON) or can use optional Current-Sense resistor for greater precision Overcurrent protection Powerful drivers for N-Channel MOSFETs with adaptive dead time Precision core voltage control Remote “Kelvin” sensing Summing current-mode control with programmable Active Droop for Optimum Transient Response and Lower Processor Power Dissipation 5-Bit Digital Output Voltage Selection Wide Range output voltage: 0.6 VDC to 1.0 VDC in 25mV Steps, and from 1.0 VDC to 1.75 VDC in 50mV Steps “On-the-Fly” VID code change with programmable slew rate Alternative input to set output voltage during start-up or power saving modes Forced continuous conduction mode of operation Output voltage (Power-Good) monitor No negative core voltage on turn-off Over-Voltage, Under-Voltage and Over-Current fault monitors Selectable 300/600kHz Switching Frequency Description The FAN5250 is a single output power controller to power mobile CPU cores. The FAN5250 includes a 5-bit digital-toanalog converter (DAC) that adjusts the core PWM output voltage from 0.6VDC to 1.75VDC, and may be changed during operation. Special measures are taken to allow the output to transition with controlled slew rate to comply with Transmeta’s LongRun™ and Intel’s P3-M Speed-Step™ requirements. The FAN5250 includes a precision reference, and...