FAN5250

更新时间： 2024-11-10 22:50:59

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		调节器
页数	文件大小	规格书
17页	470K
描述
Mobile Processor Core-Voltage Regulator

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FAN5250 数据手册

www.fairchildsemi.com

FAN5250

Mobile Processor Core-Voltage Regulator

Features

Description

• High efﬁciency over wide load range

• Non dissipative current-sense; uses MOSFET R_DS(ON)or

can use optional Current-Sense resistor for greater

precision

• Overcurrent protection

• Powerful drivers for N-Channel MOSFETs with adaptive

dead time

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’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 regula-

tion.

• 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

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.

• “On-the-Fly” VID code change with programmable slew

rate

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.

• 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

Applications

• Transmeta’s Crusoe™ CPU core power

• Intel P3-M™ processor (IMVP-2)

LongRun is a trademark of Transmeta Corporation.

REV. 1.1.6 3/12/03

12 3 4 5 6 7...17

中文翻译

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与FAN5250相关器件

型号	品牌	获取价格	描述	数据表
FAN5250QSC	FAIRCHILD	获取价格	Mobile Processor Core-Voltage Regulator
FAN5250QSCX	FAIRCHILD	获取价格	Mobile Processor Core-Voltage Regulator
FAN5307	FAIRCHILD	获取价格	High-Efficiency Step-Down DC-DC Converter
FAN5307MP15X	FAIRCHILD	获取价格	High-Efficiency Step-Down DC-DC Converter
FAN5307MP18X	FAIRCHILD	获取价格	High-Efficiency Step-Down DC-DC Converter
FAN5307MP18X_NL	FAIRCHILD	获取价格	Switching Regulator, Current-mode, 0.7A, 1200kHz Switching Freq-Max, 3 X 3 MM, LEAD FREE,
FAN5307MPX	FAIRCHILD	获取价格	High-Efficiency Step-Down DC-DC Converter
FAN5307MPX_NL	FAIRCHILD	获取价格	Switching Regulator, Current-mode, 0.7A, 1200kHz Switching Freq-Max, 3 X 3 MM, LEAD FREE,
FAN5307S15X	FAIRCHILD	获取价格	High-Efficiency Step-Down DC-DC Converter
FAN5307S18X	FAIRCHILD	获取价格	High-Efficiency Step-Down DC-DC Converter

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