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82575 Ethernet Controller Design Guide
The 1.8 V rail has a lower current requirement; however, the use of a SVR is still
recommended for adequate margin. Using an LVR in this application is acceptable as
long as adequate margin exists in the design, and sequencing can be controlled. Figure
3 shows an example of a compact low-part -count LVR that could be used for the 1.8 V
supply.
Figure 4. Example of Linear Voltage Regulator for 1.8 V power rail
3.4.1 82575 Ethernet Controller Power Sequencing
Regardless of which type of regulator used, all regulators need to adhere to the
sequencing shown in Figure 5 to avoid latch-up and forward-biased internal diodes.
RAENIL_0V1CCV
DNG
8V1CCV_
3V3CCV
RAENIL_8V1CCV
3V3CCV
DNG
DNG
eb dluohS
mhoK5<
R5X
R5X
R5X
rotalugeR raeniL v0.1 >- v8.1
>>noitceleS rotsiseR rotalugeR<<
))nwodR/puR(+1(*bfV=tuoV
nwodR*)1-)bfV/tuoV((=puR
mhoK1=K1*)1-)5.0/0.1((=puR
)A2( v0.1=tuoV
rotalugeR raeniL v8.1 >- v3.3
>>noitceleS rotsiseR rotalugeR<<
)nwodR*jdaI(+))puR/nwodR(+1(*bfV=tuoV
:mho002=nwodR nehW
mho074~=464=)1-)52.1/))002*u55(-8.1(((/)002(=puR
v8.1=tuoV
1206
6021
tupni v3.3 roF
bfV egnahC
srotsiseR
mhoK2.1 ot egnahC
roF
92C
u22
Y
92C
u22
Y
54R
K1
Y
54R
K1
Y
96R
002
Y
96R
002
Y
64R
K1
Y
64R
K1
Y
76R
0
N
76R
0
N
93C
u01
Y
93C
u01
Y
03C
u01
Y
03C
u01
Y
74R
K001
Y
74R
K001
Y
08R
0
N
08R
0
N
83C
u01
Y
83C
u01
Y
74C
u2.2
Y
74C
u2.2
Y
86R
0
Y
86R
0
Y
Vout
2
Adj
1
Vin
3
Vout
4
1U
Y
1U
Y
07R
074
Y
07R
074
Y
77R
0
Y
77R
0
Y
1NI
2
2NI
3
3NI
4
4NI
5
NE
1
1TUO
01
2TUO
11
3TUO
21
4TUO
31
BF
9
KOP
6
GND
8
2PT
41
1PT
7
E_PAD
15
3U3U
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82575