FAN5250

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 cor...

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SeekIC No. : 004340410 Detail

FAN5250: 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 p...

floor Price/Ceiling Price

Part Number:
FAN5250
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/3/28

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Product Details

Description



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



Application

• Transmeta's Crusoe™ CPU core power
• Intel P3-M™ processor (IMVP-2)



Pinout

  Connection Diagram


Specifications

Parameter Min. Typ. Max. Units
VCC Supply Voltage     6.5 V
VIN     27 V
BOOT, SW, HDRV Pins     33 V
BOOT to SW     6.5 V
All Other Pins -0.3   VCC + 0.3 V
Junction Temperature (TJ) -10   150 °C
Storage Temperature -65 150   °C
Lead Soldering Temperature, 10 seconds     300 °C



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 a proprietary architecture with integrated compensation providing excellent static and dynamic core voltage regulation.

With nominal currents, the controller operates at a selectable frequency of 300kHz or 600kHz. At light loads, when the filter inductor current becomes discontinuous, the controller operates in a hysteretic mode dramatically improving system efficiency. The hysteretic mode of operation can be inhibited by the FPWM control pin.

The FAN5250 monitors the output voltage and issues a PGOOD (Power-Good) when soft start is completed and the output is in regulation. A built-in over-voltage protection (OVP) forces the lower MOSFET on to prevent output voltages from exceeding 1.9V. Undervoltage protection latches the chip off when the output drops below 75% of the set value. The PWM controller's overcurrent circuitry monitors the converter load by sensing the voltage drop across the lower MOSFET. The overcurrent threshold is set by an external resistor. If precision overcurrent protection is required, an optional external current-sense resistor may be used.




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