FAN5240QSCX

FAN5240QSCX Datasheet

FAN5240 Multi-Phase PWM Controller for AMD Mobile Athlon and Duron

Part	Datasheet
FAN5240QSCX	FAN5240QSCX (pdf)

Related Parts	Information
FAN5240QSC	FAN5240QSC
FAN5240MTCX	FAN5240MTCX
FAN5240MTC	FAN5240MTC

PDF Datasheet Preview
FAN5240 Multi-Phase PWM Controller for AMD Mobile Athlon and Duron March 2006 FAN5240 Multi-Phase PWM Controller for AMD Mobile Athlon and Duron • CPU Core power 0.925V to 2.0V output range • ±1% reference precision over temperature • Dynamic voltage setting with 5-bit DAC • 6V to 24V input voltage range • 2 phase interleaved switching • Active droop to reduce output capacitor size • Differential remote voltage sense • High >90% over wide load range >80% 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 • AMD Mobile CPU VCORE Regulator • Graphic chip VCORE Regulator The FAN5240 is a single output 2-Phase synchronous buck controller to power AMD’s 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’s Power technology. The FAN5240 includes a precision reference, and a proprietary architecture with integrated compensation providing excellent static and dynamic core voltage regulation. The regulator includes special circuitry which balances the 2 phase currents for maximum 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 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 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. Ordering Information Part Number FAN5240QSC FAN5240QSCX FAN5240MTC FAN5240MTCX Temperature Range -10°C to 85°C -10°C to 85°C -10°C to 85°C -10°C to 85°C Package QSOP-28 QSOP-28 TSSOP-28 TSSOP-28 Packing Rails Tape and Reel Rails Tape and Reel 2006 Fairchild Semiconductor Corporation FAN5240 Multi-Phase PWM Controller for AMD Mobile Athlon and Duron VIN BATTERY = 5 to 24V VCC 28 C3 C4 R1 PGOOD 19 EN 14 C5 FPWM 12 VID0 11 VID1 10 VID2 9 VID3 8 VID4 7 C11 SS 20 C10 DELAY 16 R4 ILIM 13 AGND 15 VIN 21 Phase 1 Phase 2 25 BOOT1 Q1 24 HDRV1 23 SW1 +5 C7 LDRV1 27 R2 26 PGND1 22 ISNS1 18 VCORE + R6 C12 C13 C14 17 VCORE D 3 BOOT2 VIN C9 Q4 4 HDRV2 5 SW2 D1 +5 V CORE C16 LDRV2 1 R3 2 PGND2 6 ISNS2 Figure AMD Mobile Athlon/Duron CPU Core Supply Table BOM for Figure 1 Description Capacitor 22µF, Ceramic X7R 25V Capacitor 1µF, Ceramic Capacitor 0.1µF, Ceramic Capacitor 0.22µF, Ceramic Capacitor 270µF, 2V, ESR 5% Resistor 1% Resistor 1% Resistor Schottky Diode 40V Inductor 1.6µH, 20A, N-Channel SO-8 MOSFET, N-Channel SO-8 SyncFET MOSFET, Ref. 2 C1, C2

PDF Datasheet Preview

FAN5240 Multi-Phase PWM Controller for AMD Mobile Athlon and Duron

March 2006

FAN5240 Multi-Phase PWM Controller for AMD Mobile Athlon and Duron
• CPU Core power 0.925V to 2.0V output range
• ±1% reference precision over temperature
• Dynamic voltage setting with 5-bit DAC
• 6V to 24V input voltage range
• 2 phase interleaved switching
• Active droop to reduce output capacitor size
• Differential remote voltage sense
• High
>90% over wide load range >80% 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
• AMD Mobile CPU VCORE Regulator
• Graphic chip VCORE Regulator

The FAN5240 is a single output 2-Phase synchronous buck controller to power AMD’s 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’s Power technology. The FAN5240 includes a precision reference, and a proprietary architecture with integrated compensation providing excellent static and dynamic core voltage regulation. The regulator includes special circuitry which balances the 2 phase currents for maximum

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 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 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.
Ordering Information

Part Number FAN5240QSC FAN5240QSCX FAN5240MTC FAN5240MTCX

Temperature Range -10°C to 85°C -10°C to 85°C -10°C to 85°C -10°C to 85°C

Package QSOP-28 QSOP-28 TSSOP-28 TSSOP-28

Packing Rails

Tape and Reel Rails

Tape and Reel
2006 Fairchild Semiconductor Corporation

FAN5240 Multi-Phase PWM Controller for AMD Mobile Athlon and Duron

VIN BATTERY = 5 to 24V

VCC 28

C3 C4

R1 PGOOD 19

EN 14 C5

FPWM 12 VID0 11 VID1 10 VID2 9 VID3 8 VID4 7

C11 SS 20 C10

DELAY 16 R4 ILIM 13

AGND 15

VIN 21 Phase 1

Phase 2
25 BOOT1

Q1 24 HDRV1 23 SW1
+5 C7

LDRV1 27

R2 26 PGND1
22 ISNS1 18 VCORE + R6

C12 C13 C14
17 VCORE D
3 BOOT2 VIN

C9 Q4
4 HDRV2 5 SW2

D1 +5

V CORE C16

LDRV2 1

R3 2 PGND2
6 ISNS2

Figure AMD Mobile Athlon/Duron CPU Core Supply

Table BOM for Figure 1 Description

Capacitor 22µF, Ceramic X7R 25V Capacitor 1µF, Ceramic Capacitor 0.1µF, Ceramic Capacitor 0.22µF, Ceramic Capacitor 270µF, 2V, ESR 5% Resistor 1% Resistor 1% Resistor Schottky Diode 40V Inductor 1.6µH, 20A, N-Channel SO-8 MOSFET, N-Channel SO-8 SyncFET MOSFET,

Ref.
2 C1, C2

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Datasheet ID: FAN5240QSCX 513930