Intel 317698-001 manual Example Switching Voltage Regulator for 1.0 V and 1.8

Page 22

82575 Ethernet Controller Design Guide

VCC3V3

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC1V8_SWITCHING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vout=1.8v (2.5A)

 

 

 

 

 

 

22p Y C104

 

 

 

 

 

 

 

 

 

 

 

 

 

X5R

R112

Y 232K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Y

R110

Y 10K

R109

 

U9

 

 

 

C66

 

 

 

 

1

SVin

 

PVin2

16

22u

 

 

 

C103

560p

 

C102

100K

 

 

 

Y X5R

 

 

 

 

 

 

 

 

 

 

 

 

 

X7R

 

 

47p

Y

2

PGOOD

 

SW4

15

 

 

 

 

 

 

 

 

Y

 

3

ITH

 

SW3

14

 

 

 

 

 

 

 

 

 

 

 

 

1u

 

 

R113

Y 75K

R111

Y 110K

 

 

 

 

L2

Y

 

 

4

VFB

 

PGND2

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R95

Y 301K

 

 

 

 

 

 

 

 

 

 

 

 

5

RT

 

PGND1

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

SYNC/MODE

SW2

11

 

 

C56

C65

R92

Y 1M

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

RUN/SS

PAD

SW1

10

 

 

22u

22u

 

 

 

 

C85

 

 

 

 

 

 

 

 

 

 

X5R

 

Y

Y

 

 

 

 

 

 

8

SGND

E_

PVin1

9

 

X5R

 

 

 

 

Y

470p

 

22u Y C64

 

 

 

 

 

 

 

 

 

Y

 

 

 

 

 

 

 

X7R

 

 

 

17

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<<Regulator Resistor Selection>>

 

 

 

 

GND

 

 

Vout=0.8*(1+Rup/(Rright+Rleft))

 

 

 

 

 

 

 

 

 

Rup=((Vout/0.8)-1)*(Rright+Rleft)

 

 

 

 

 

 

 

 

 

Rup=((1.8/0.8)-1)*(110k+75k)=231.25k=232Kohm

 

 

 

 

 

3.3v -> 1.8v Step-Down Switching Regulator

 

 

 

 

 

 

VCC1V0_SWITCHING

Rise after

VCC1V8_SWITCHING

VCC3V3

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC1V0_SWITCHING

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vout=1.0v (2.5A)

 

 

 

 

 

 

22p Y C101

 

 

 

 

 

 

 

 

 

 

 

 

 

X5R

R107

Y 49.9K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Y

R105

Y 10K

R104

 

U8

 

 

 

C61

 

 

 

 

1

SVin

 

PVin2

16

22u

 

 

 

C100

560p

 

C99

100K

 

 

 

Y X5R

 

 

 

 

 

 

 

 

 

 

 

 

 

X7R

 

 

47p

Y

2

PGOOD

 

SW4

15

 

 

 

 

 

 

 

 

Y

 

3

ITH

 

SW3

14

 

 

 

 

 

 

 

 

 

 

 

 

1u

 

 

R108

Y 75K

R106

Y 110K

 

 

 

 

L1

Y

 

 

4

VFB

 

PGND2

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R94

Y 301K

 

 

 

 

 

 

 

 

 

 

 

 

5

RT

 

PGND1

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

SYNC/MODE

SW2

11

 

 

C55

C62

R91

Y 5.11M

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

RUN/SS

PAD

SW1

10

 

 

22u

22u

 

 

 

 

C84

 

 

 

 

 

 

 

 

 

 

X5R

 

Y

Y

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

SGND

E_

PVin1

9

 

X5R

 

 

 

 

Y

470p

 

22u Y C63

 

 

 

 

 

 

 

 

 

Y

 

 

 

 

 

 

 

X7R

 

 

 

17

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

<<Regulator Resistor Selection>>

 

 

 

 

 

GND

 

 

Vout=0.8*(1+Rup/(Rright+Rleft))

 

 

 

 

 

 

 

 

 

Rup=((Vout/0.8)-1)*(Rright+Rleft)

 

 

 

 

 

 

 

 

 

Rup=((1.0/0.8)-1)*(110k+75k)=46.25k=49.9Kohm

 

 

 

 

 

3.3v -> 1.0v Step-Down Switching Regulator

 

 

 

 

 

 

Figure 3. Example Switching Voltage Regulator for 1.0 V and 1.8 V

16

Image 22
Contents Intel 82575 Gigabit Ethernet Controller Design GuidePage Contents Design and Layout Checklists Revision History Date Revision DescriptionThis page intentionally left blank Introduction ScopeReference Documents Link Width Configuration Other PCI Express SignalsPhysical Layer Features PCI Express Port Connection to the DevicePolarity Inversion Lane ReversalPCI Express Routing Lane Reversal supported modesThis page left intentionally blank Clock Source Ethernet Component Design GuidelinesGeneral Design Considerations for Ethernet Controllers Magnetics for 1000 BASE-TThird-Party Magnetics Manufacturers Designing with the 82575/EB/ES Gigabit Ethernet ControllerModules for 1000 BASE-T Ethernet Manufacturer Part NumberPCI/LAN Function Index PCI Function # SelectSerial Eeprom Symbol Ball # Name and functionFunction Default Control options General RegionsSPI EEPROMs for 82575 Ethernet Controller Controller Eeprom Map InformationManufacturer Size Manufacturers Part Number Eeupdate FlashFlash Write Control Flash Erase ControlFlash Device Information SMBus and NC-SIManufacturer Device Power Supplies for the 82575 Ethernet Controller Controllers Example Switching Voltage Regulator for 1.0 V and 1.8 1 82575 Ethernet Controller Power Sequencing Vout=1.0v 2AY Using Regulators With Enable Pins 2 82575 Ethernet Controller Device Power Supply FilteringPower Rail 7uF or 1uF 10uF Power Management PCIe Power Management4.2 82575 Ethernet Controller Power Management L0s D0u D0a82575 Ethernet Controller Device Test Capability Auto Cross-over for MDI and MDI-X resolutionPHY Functionality Smartspeed Low-Power Link UpUsing SmartSpeed Flow ControlPolarity Correction Link Energy Detect25.6 Reg Copper PHY Link Configuration Auto-Negotiation differences between PHY, SerDes and SgmiiCopper/Fiber Switch SerDes-Detect Mode PHY is activeDevice Disable Internal PHY-to-SerDes TransitionSoftware-Definable Pins SDPs Bios handling of Device DisableEthernet Controller Design Guide Quartz Crystal Frequency Control Device Design ConsiderationsFrequency Control Component Types Fixed Crystal OscillatorProgrammable Crystal Oscillators Ceramic ResonatorCrystal Selection Parameters Vibrational ModeTemperature Stability and Environmental Requirements Nominal FrequencyCalibration Mode Load CapacitanceDrive Level Shunt CapacitanceEquivalent Series Resistance AgingReference Crystal Selection Temperature ChangesCircuit Board This page is intentionally left blank Specifications Symbol Parameter Units Min Typical Max Oscillator SolutionOscillator Support VGG=0.6V Rpar =100MΩ Cpar =20pF Ethernet Component Layout Guidelines Guidelines for Component PlacementLayout Considerations for 82575 Ethernet Controllers LAN Layout for Integrated Magnetics Crystals and Oscillators Crystal layout considerationsBoard Stack Up Recommendations CrystalDifferential Pair Trace Routing for 10/100/1000 Designs Trace RoutingSignal Termination and Coupling Signal Trace Geometry for 1000 BASE-T DesignsTrace Length and Symmetry for 1000 BASE-T Designs Routing 1.8 V to the Magnetics Center Tap Signal IsolationSignal Detect Impedance DiscontinuitiesPower and Ground Planes Traces for Decoupling CapacitorsThermal Design Considerations Physical Layer Conformance TestingTroubleshooting Common Physical Layout Issues Conformance Tests for 10/100/1000 Mbps DesignsEthernet Controller Design Guide Symbol Design and Layout ChecklistsReference Schematics Thermal Management

317698-001 specifications

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