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FAN5240QSC Datasheet

  • FAN5240QSC

  • Multi-Phase PWM Controller for AMD Mobile Athlon TM and Duro...

  • 19頁

  • FAIRCHILD

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www.fairchildsemi.com
FAN5240
Multi-Phase PWM Controller for AMD Mobile
Athlon
TM
and Duron
TM
Features
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鈥?/div>
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鈥?/div>
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CPU Core power: 0.925V to 2.0V output range
鹵1% reference precision over temperature
Dynamic voltage setting with 5-bit DAC
5V to 24V input voltage range
2 phase interleaved switching
Active droop to reduce output capacitor size
Differential remote voltage sense
High ef鏗乧iency:
>90% ef鏗乧iency over wide load range
>80% ef鏗乧iency at light load
Excellent dynamic response with Voltage Feed-Forward
and Average Current Mode control
Dynamic duty cycle clamp minimizes inductor current
build up
Lossless current sensing on low-side MOSFET or
Precision current sensing using sense resistor
Fault protections: Over-voltage, Over-current, and
Thermal Shut-down
Controls: Enable, Forced PWM, Power Good, Power
Good Delay
QSOP28, TSSOP28
General Description
The FAN5240 is a single output 2-Phase synchronous buck
controller to power AMD鈥檚 mobile CPU core. The FAN5240
includes a 5-bit digital-to-analog converter (DAC) that
adjusts the core PWM output voltage from 0.925VDC to
2.0VDC, which may be changed during operation. Special
measures are taken to allow the output to transition with
controlled slew rate to comply with AMD鈥檚 Power Now
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technology. The FAN5240 includes a precision reference,
and a proprietary architecture with integrated compensation
providing excellent static and dynamic core voltage regula-
tion. The regulator includes special circuitry which balances
the 2 phase currents for maximum ef鏗乧iency.
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 FAN5240 monitors the output voltage and issues a
PGOOD (Power-Good) when soft start is completed and the
output is in regulation. A pin is provided to add delay to
PGOOD with an external capacitor.
A built-in over-voltage protection (OVP) forces the lower
MOSFET on to prevent the output from exceeding a set
voltage. The PWM controller's overcurrent circuitry moni-
tors the converter load by sensing the voltage drop across the
lower MOSFET. The overcurrent threshold is set by an exter-
nal resistor. If precision overcurrent protection is required,
an optional external current-sense resistor may be used.
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Applications
鈥?AMD Mobile Athlon
餂?/div>
CPU V
CORE
Regulator
鈥?AMD Mobile Duron
餂?/div>
CPU V
CORE
Regulator
REV. 1.1.7 8/29/02

FAN5240QSC 產(chǎn)品屬性

  • 94

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - 專用型

  • -

  • 控制器，AMD 移動式 Athlon?，Duron?

  • 6 V ~ 24 V

  • 1

  • 0.93 V ~ 2 V

  • -10°C ~ 85°C

  • 表面貼裝

  • 28-TSSOP（0.173"，4.40mm 寬）

  • 28-QSOP

  • 管件

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