5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
VPORTP
-VOUT
+VOUT
VPORTN
GND
NOTES:
1. Unless otherwise noted, all resistors on this sheet are 0603, 5%
2. Unless otherwise noted, all capacitors on this sheet are 0603 and 50V
GND
+12V/5.5A
T2P
Optional Footprints
AUX+
AUX-
Auxilliary Supply
37V - 57V
AUX OFF: 27.3V
AUX ON: 28.3V
AUX HYS: 1.0V
WITH FORWARD DC-DC CONVERTER
37V - 57V
+VOUT
VCC
VCC
+VOUT
VCC
+VOUT
T2P
T2P
+VOUT
VCC
+VOUT
+VOUT
+VOUT
VPORTP
VPORTN
VGS_FWD
VDS_FREE
VDS_FWD
VGS_FREE
VDS_FREE
VDS_FWD
VDS_PRI
VIN
VIN
VDS_PRI
V3RD
V3RDVDS_FREE
CT
CT
VDS_FREE
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
KAUNG H.
PRODUCTION1 1 09-06-2016
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
KAUNG H.
PRODUCTION1 1 09-06-2016
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
KAUNG H.
PRODUCTION1 1 09-06-2016
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, February 27, 2017
12
IEEE 802.3bt POWERED DEVICE INTERFACE
K. HTOO
K. HTOO
N/A
LT4295IUFD, LT4321IUF
DEMO CIRCUIT 2584A-A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, February 27, 2017
12
IEEE 802.3bt POWERED DEVICE INTERFACE
K. HTOO
K. HTOO
N/A
LT4295IUFD, LT4321IUF
DEMO CIRCUIT 2584A-A
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, February 27, 2017
12
IEEE 802.3bt POWERED DEVICE INTERFACE
K. HTOO
K. HTOO
N/A
LT4295IUFD, LT4321IUF
DEMO CIRCUIT 2584A-A
100pF
C37
0.1uF
C18
D27
ZR431F01TA
3 2
1
100pF
C33
D30
PMEG6010ER
21
D24
PTVS58VS1UR
2 1
33nF
C15
1206
250V
C34
100pF
E1
R57
10K
R49
52.3
1%
0805
E5
Q12
BSC123N08NS3 G
6
4
5
8
7
1
2
3
J3
C7
22uF
16V
1210
2.2uF
C10
100V
1210
E9
HSS
R63
174k
1%
N/C
N/C
N/C
U5
MOC207M
1
5
6
2
7
8
3
4
E4
0.047uF
C23
100V
C35
6.8nF
D29
BAT54WS
2 1
OPT
C26
0402
R31
2K
1206
E3
OPT
L5
0.1uF
C5
R39
29.4K
OPT
C28
1206
+
C27
16V
16HVA100M
R34
100 1206
+
C8
6.3V
OPT
R52
20K
R66
20
4.9uH
L2
744314490
Q13
FMMT723
3
1
2
C13
22uF
16V
1210
2.2uF
C11
100V
1210
D26
CMHZ4700
13V
2 1
R45
13K
E7
R53
107K
C21
10nF
0603
100V
R41
8.2
0805
E2
R44
15m
2010
1%
R58
10.0K
1%
+
22uF
C9
100V
E6
R42
0
L4
2.2mH
7446632002
1 2
34
Q14
BSC123N08NS3 G
6
4
5
8
7
1
2
3
R30
OPT
1206
D22
BAV19WS
2 1
D25
PTVS58VS1UR
2 1
R38
10K
Q11
PSMN040-100MSE
6
4
5
8
7
1
2
3
C31
0.1uF
LIP1
C29
0.1uF
R62
52.3k
1%
R59
820
R51
100k
1uF
C32
0805
R48
118
1%
100uH
L3
R50
0
0402
C17
10uF
1206
10V
R28
10k
PDS5100H
D12
2
1
3
R64
OPT
2.2nF
C24
2KV
1812
2.2nF
C19
2KV
1812
R47
38.3K
1%
R35
OPT
1206
exposed pad, solder side
U1
LT4295IUFD
VPORT
28
HSGATE
26
HSSRC
25
SWVCC
23
DNC
22
VCC
21
VIN
24
PG
20
FB31
14
ISEN-
16
ISEN+
17
SG
18
AUX
2
RCLASS++
3
RCLASS
4
GND
19
VCC
6
VCC
7
VCC
8
T2P
5
SFST
11
RLDCMP
15
VCC
9
GND
1
ITHB
13
FFSDLY
12
NC
27
ROSC
10
GND_EP
29
E8
Q15
FDMC2523P
6
4
5
8
7
1
2
3
R43
0
0402
2.2nFC38
2KV 1812
T3
OPT
2
10
8
6
5
7
11
1
4
3
8.2uH
L1
XAL1010-822ME
R40
0
C30
330pF
R60
0
0402
2.2nFC40
2KV 1812
D23
CMMSH1-40L
21
R65
0
R29
4.7k
OPT
C12
1206
250V
R56
750
Q16
BSC190N12NS3
6
4
5
8
7
1
2
3
LIP2
N/C
N/C
N/C
U3
MOC207M
1
5
6
2
7
8
3
4
D21
LN1351C
GREEN
1nF
C22
100V
R46
10
0805
R36
3.3K
0.22uF
C14
250V1210
J4
T2
EPC3577G-LF
2
11
8
6
5
7
12
1
4
3
9
10
MMBT3904
Q25
PG
PG
