FAN5250QSCX_SM2E203

FAN5250QSCX_SM2E203 Datasheet

FAN5250

Part	Datasheet
FAN5250QSCX_SM2E203	FAN5250QSCX_SM2E203 (pdf)

Related Parts	Information
FAN5250QSCX	FAN5250QSCX
FAN5250QSC	FAN5250QSC

PDF Datasheet Preview
FAN5250 Mobile Processor Core-Voltage Regulator • High 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 VDC to VDC in 25mV Steps, and from VDC to 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 • Transmeta’s Crusoe CPU core power • Intel P3-M processor IMVP-2 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 inductor current becomes discontinuous, the controller operates in a hysteretic mode dramatically improving system 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. LongRun is a trademark of Transmeta Corporation. FAN5250 PVCC AGND 1 PGOOD 3 R7 ALTV 6 START DSX ILIM R5 15 FPWM 5 FREQ 7 VID0 12 VID1 11 VID2 10 VID3 9 VID4 8 FAN5250 18 BOOT VIN BATTERY = 5 to 24V 13 VIN Q1 19 HDRV 20 SW 21 ISNS Q2 23 LDRV CBOOT L OUT V CORE COUT 22 PGND 16 VCORE+ 17 N/C Pin Assignments Figure AGND VCC PGOOD EN FPWM ALTV FREQ VID4 VID3 VID2 VID1 VID0 QSOP-24 ΘJA = 90°C PVCC LDRV PGND ISNS SW HDRV BOOT NC VCORE+ ILIM SS VIN FAN5250 Pin Description Pin Number Pin Name Pin Function Description AGND Analog Ground. This is the signal ground reference for the IC. All voltage levels are Ordering Information Part Number FAN5250QSC Temperature Range -10°C to 85°C Package QSOP-24 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. 3/12/03 0.0m 003 Stock#DS30005250 2001 Fairchild Semiconductor Corporation

PDF Datasheet Preview

FAN5250

Mobile Processor Core-Voltage Regulator
• High 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 VDC to VDC in 25mV Steps, and from VDC to 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
• Transmeta’s Crusoe CPU core power
• Intel P3-M processor IMVP-2

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 inductor current becomes discontinuous, the controller operates in a hysteretic mode dramatically improving system 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.

LongRun is a trademark of Transmeta Corporation.

FAN5250

PVCC

AGND 1

PGOOD 3

R7 ALTV 6

START DSX

ILIM R5
15 FPWM 5 FREQ 7

VID0 12 VID1 11 VID2 10 VID3 9 VID4 8

FAN5250
18 BOOT

VIN BATTERY = 5 to 24V
13 VIN

Q1 19 HDRV 20 SW 21 ISNS

Q2 23 LDRV

CBOOT

L OUT

V CORE

COUT
22 PGND
16 VCORE+ 17 N/C

Pin Assignments

Figure

AGND VCC

PGOOD EN

FPWM ALTV FREQ VID4 VID3 VID2 VID1 VID0

QSOP-24 ΘJA = 90°C

PVCC LDRV PGND ISNS SW HDRV BOOT NC VCORE+ ILIM SS VIN

FAN5250

Pin Description

Pin Number Pin Name Pin Function Description

AGND Analog Ground. This is the signal ground reference for the IC. All voltage levels are
Ordering Information

Part Number FAN5250QSC

Temperature Range -10°C to 85°C

Package QSOP-24

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:

Life support devices or systems are devices or systems which, a are intended for surgical implant into the body, or b support or sustain life, and c whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.

A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
3/12/03 0.0m 003 Stock#DS30005250 2001 Fairchild Semiconductor Corporation

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Datasheet ID: FAN5250QSCX_SM2E203 513931