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

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Image 22
Intel 317698-001 manual Example Switching Voltage Regulator for 1.0 V and 1.8

317698-001 specifications

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