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FAN5250QSC Datasheet

  • FAN5250QSC

  • Mobile Processor Core-Voltage Regulator

  • 17頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN5250
Mobile Processor Core-Voltage Regulator
Features
鈥?High ef鏗乧iency over wide load range
鈥?Non dissipative current-sense; uses MOSFET R
DS(ON)
or
can use optional Current-Sense resistor for greater
precision
鈥?Overcurrent protection
鈥?Powerful drivers for N-Channel MOSFETs with adaptive
dead time
鈥?Precision core voltage control
鈥?Remote 鈥淜elvin鈥?sensing
鈥?Summing current-mode control with programmable
Active Droop for Optimum Transient Response and
Lower Processor Power Dissipation
鈥?5-Bit Digital Output Voltage Selection
鈥?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
鈥?鈥淥n-the-Fly鈥?VID code change with programmable slew
rate
鈥?Alternative input to set output voltage during start-up or
power saving modes
鈥?Forced continuous conduction mode of operation
鈥?Output voltage (Power-Good) monitor
鈥?No negative core voltage on turn-off
鈥?Over-Voltage, Under-Voltage and Over-Current fault
monitors
鈥?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-to-
analog 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鈥檚 LongRun鈩?and Intel鈥檚 P3-M Speed-Step鈩?/div>
requirements. The FAN5250 includes a precision reference,
and a proprietary architecture with integrated compensation
providing excellent static and dynamic core voltage regula-
tion.
With nominal currents, the controller operates at a selectable
frequency of 300kHz or 600kHz. At light loads, when the
鏗乴ter inductor current becomes discontinuous, the controller
operates in a hysteretic mode dramatically improving system
ef鏗乧iency. 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 volt-
ages 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.
Applications
鈥?Transmeta鈥檚 Crusoe鈩?CPU core power
鈥?Intel P3-M鈩?processor (IMVP-2)
LongRun is a trademark of Transmeta Corporation.
REV. 1.1.6 3/12/03

FAN5250QSC 產(chǎn)品屬性

  • 54

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 轉(zhuǎn)換器，移動式 Intel Pentium? III

  • 5 V ~ 24 V

  • 1

  • 0.6 V ~ 1.75 V

  • -10°C ~ 85°C

  • 表面貼裝

  • 24-SSOP（0.154"，3.90mm 寬）

  • 24-QSOP

  • 管件

  • FAN5250QSC_NLFAN5250QSC_NL-ND

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