Instruction Manual

MAX5945
Quad Network Power Controller
for Power-Over-LAN
40 ______________________________________________________________________________________
Figure 17. -48V to +3.3V (300mA) Boost Converter Solution for V
DIG
GND
-48V
-48V
GND
C6
0.47µF
100V
R10
2Ω
R6
1Ω
C3
15nF
Q4
MMBTA56
R5
1kΩ
L1
68µH, DO3308P-683
MAX5020
1
2
3
4
8
7
6
5
V+
V
DD
FB
V
CC
NDRV
GND
CS
C2
0.022µF
R8
30Ω
C1
0.1µF
C8
2.2µF
R4
1Ω
R9
1Ω
GATE
SOURCE
DRAIN
Q1
Si2328 DS
C9
4.7µH
C7
0.22µF
R7
1.02kΩ
R2
6.81kΩ
R3
2.61kΩ
Q3
MMBTA56
D1
DIODES INC.: B1100
C4
220µF
Sanyo 6SPS220M
R1
2.6kΩ
Q2
MMBTA56
C5
4.7µF
+3.3V
+3.3V
GND
300mA
SS_SHDN
Figure 18. Layout Example for Boost Converter Solution for V
DIG
1700 (mils)
965 (mils)
1700 (mils)
965 (mils)
1700 (mils)
965 (mils)