Linear Technology DC2125 Quick setup guide

1
dc2125f
DEMO MANUAL DC2125
Description
LT4275, LT4321, LTM8027
Small Highly-Integrated Highly-Efficient
Non-Isolated PoE Powered Device
Demonstration circuit 2125 is a small, highly-integrated,
non-isolatedPoEPowered Device (PD) solution. Itfeatures
a PD Interface Controller (LT
®
4275), which interfaces with
a PoE Power Sourcing Equipment (PSE), an ideal diode
bridgecontroller(LT4321),whichminimizesbridgelosses,
and a DC/DC µModule
®
regulator (LT M
®
8027).
The DC2125 is initially configured as a 38.7W LTPoE++
™
PD that is capable of providing 12V and 3A at the output.
Users can configure the PD circuit to be an IEEE802.3
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
performance summary
BoarD photos
compliant Type 2 (25.5W, “at”) or Type 1 (13W, “af”) PD
by changing the RCLASS and RCLASS++ resistors. See
the LT4275 data sheet for further information. The output
voltage of the LTM8027 can be easily configured for differ-
ent output voltages as shown in the LTM8027 data sheet.
Gerber files for this circuit board are available. Call
the LT C factory.
Specifications are at TA= 25°C
SYMBOL CONDITIONS UNITS
VPORT RJ-45 Port Voltage Range 37V to 57V
IOUT(MAX) Maximum Current from VOUT+to VOUT–3A
VOUT Output Voltage 12V (typ)
ΔVOUT(RIPPLE) Output Voltage Ripple at VPORT = 50V, IOUT = 3A 58mVpp (typ)
ΔVOUT(REG) Output Voltage Regulation, IOUT = 0A to 3A, VPORT ±0.031% (typ)
Efficiency Maximum Efficiency, VPORT = 41V, IOUT = 3A 90% (typ)
fSW Switching Frequency 300kHz (typ)
Top Side Bottom Side

2
dc2125f
DEMO MANUAL DC2125
typical performance characteristics
Figure 1. Thermal Pictures – VPORT = 50V, IOUT = 3A
Efficiency and Regulation
Top Side Bottom Side

3
dc2125f
DEMO MANUAL DC2125
Quick start proceDure
NOTE:HandletheDC2125printedcircuitboard bytheedges.
1. Refer to Figure 2 below to evaluate the DC2125 while
powering a 12V Load such as power resistors or an
electronic load.
2. Connect the positive terminal of the 12V Load to the
VOUT+turret, E1. Connect the negative terminal of the
12V Load to the VOUT–turret, E2. If using an electronic
load, power it on and turn the load current down to 0A.
3. Check the power delivery capability of the LTPoE++
PSE to ensure it can power the PD and the 12V Load.
Power-up the LTPoE++ PSE. NOTE: The DC1814A-A
LTPoE++ PSE demo board can power the DC2125 to
its full rated power.
4. Connect the output of the PSE to the input RJ45 connec-
tor, J1, of the DC2125 with a CAT5e or CAT6 Ethernet
cable ≤ 100 meters in length.
5. After connection has been established, verify that the
LED (D2) is lit. This indicates the PSE has successfully
detected and powered the PD.
6. The 12V Load can now be adjusted to exercise the
DC2125 over its full operating load range.
Figure 2. Setup Diagram for the DC2125 Using an LTPoE++ PSE and a Load
+
–
LTPoE++
PSE
EXAMPLE:
DC1814A-AE
CAT-5E
OR
CAT-6
CABLE
12V
LOAD
DC2125 F01

4
dc2125f
DEMO MANUAL DC2125
parts list
QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
2 C1, C3 CAP., X7S, 0.047µF 100V, 10%, 0603 TDK, C1608X7S2A473K
1 C2 CAP., X7R, 47nF 100V, 10%, 0805 AVX, 08051C473KAT2A
1 C4 CAP., X7R, 22µF 16V, 20%, 1210 AVX, 1210YC226MAT2A
2 C5, C6 CAP., TQC, 68µF 16V, 7343 PANASONIC, 16TQC68MYF
1 C7 CAP., X7R, 0.1µF 50V, 10%, 0603 MURATA, GRM188R71H104KA93D
1 C8 CAP., ALUMINUM, 22µF 63V,C-CE-BS-6.3X7.7 SUN ELECT., 63CE22BS
1 C9 CAP., X7R, 2.2µF 100V, 1210 AVX, 12101C225KAT2A
1 C10 CAP., X7R, 1500pF 100V, 5%, 0603 AVX, 06031C152JAT2A
1 D1 DIODE, 600W TRANSIENT VOLTAGE SUPPRESSOR, SOD128 NXP, PTVS58VP1UP
1 J1 CONN., MAGJACK 1PORT 1000BASE-T WE, 7499511001
1 L1 IND, 10µH, DO1608C COILCRAFT, DO1608C-103MLB
9 Q1-Q9 MOSFET, N-CH, LFPAK33 NXP, PSMN075-100MSE
1 R2 RES., CHIP, 8.2Ω, 5%, 0603 VISHAY, CRCW06038R20JNEA
1 R3 RES., CHIP, 3.3k, 5%, 0603 VISHAY, CRCW06033K30JNEA
2 R4, R5 RES., CHIP, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA
1 R9 RES., CHIP, 34.8Ω, 1%, 0805 VISHAY, CRCW080534R8FKEA
1 R12 RES., CHIP, 56.2k, 1%, 0603 VISHAY, CRCW060356K2FKEA
1 R13 RES., CHIP, 49.9k, 1%, 0603 VISHAY, CRCW060349K9FKEA
1 U1 IC, LT4275AIDD#PBF, DFN10DD-3X3 LINEAR TECHNOLOGY CORPORATION, LT4275AIDD#PBF
1 U2 IC, LT4321IUF#PBF, QFN16UF-4X4 LINEAR TECHNOLOGY CORPORATION, LT4321IUF#PBF
1 U3 IC, µModule REGULATOR, LGA113-15X15X4.32 LINEAR TECHNOLOGY CORPORATION, LTM8027EV#PBF
Optional Circuit Components
1 CG1 CAP., X7R, 1000pF, 2KV, 10% 1808 TDK, C4520X7R3D102K
1 D2 LED, GREEN ROHM, SML-010FTT86L
1 J2 CONN., SS-7188S-A-NF STEWART CONNECTOR, SS-7188S-A-NF
4RT1-RT4 RES., CHIP, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA
3 R1, R6, R7 RES., CHIP, 0Ω, 5%, 0603 VISHAY, CRCW06030000Z0EA
0 R8 RES., 0805 OPT
1 R11 RES., CHIP, 2k, 5%, 0805 VISHAY, CRCW08052K00JNEA
2 R10, R14 RES., CHIP, 0Ω, 5%, 0402 VISHAY, CRCW04020000Z0ED
Hardware: For Demo Board Only
2 E1, E2 TP, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0
4 MH1-MH4 STANDOFF, NYLON, 0.5, 1/2" KEYSTONE, 8833 (SNAP ON)

5
dc2125f
DEMO MANUAL DC2125
Figure 3. DC2125 Demo Circuit Schematic, Sheet 1
schematic Diagram
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
1. ALL RESISTORS AND CAPACITORS ARE 0603. 2. ALL RESISTORS TOLERANCE RATING ARE 5%. NOTE: UNLESS OTHERWISE SPECIFIED
37V-57V
IN FROM PSE,
OUT TO PHY
IN FROM LTPoE++ OR PoE PSE
RCLASS++ RCLASS
DATA1 DATA2 SPARE1 SPARE2
PWRGD
VPORTP VPORTN
VIN
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
RYAN H.2ND PROTOTYPE2 03-05-14
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
RYAN H.2ND PROTOTYPE2 03-05-14
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
RYAN H.2ND PROTOTYPE2 03-05-14
__
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
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2
03/05/2014, 10:30 AM
13
SMALL-SIZED PoE PD WITH POWER SUPPLY uMODULE
KIM T.
RYAN H.
N/A
LT4275AIDD, LT4321IUF, LTM8027EV
DEMO CIRCUIT 2125A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
03/05/2014, 10:30 AM
13
SMALL-SIZED PoE PD WITH POWER SUPPLY uMODULE
KIM T.
RYAN H.
N/A
LT4275AIDD, LT4321IUF, LTM8027EV
DEMO CIRCUIT 2125A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
03/05/2014, 10:30 AM
13
SMALL-SIZED PoE PD WITH POWER SUPPLY uMODULE
KIM T.
RYAN H.
N/A
LT4275AIDD, LT4321IUF, LTM8027EV
DEMO CIRCUIT 2125A
R6
0
R6
0
PWRGDPWRGD
C2 47nF X7R 100V 0805 C2 47nF X7R 100V 0805
R8 OPT 1% 0805 R8 OPT 1% 0805
R4 100k R4 100k
1 2 3 6 4
5 7
8
4 X 12nF
4 X 75 Ohms
1nF 2kV
J1 7499511001
1 2 3 6 4
5 7
8
4 X 12nF
4 X 75 Ohms
1nF 2kV
J1 7499511001
TRD1+ 11
TRCT1 12
TRD1- 10
TRD2+ 4
TRCT2 6
TRD2- 5
TRD3+ 3
TRCT3 1
TRD3- 2
TRD4+ 8
TRCT4 7
TRD4- 9
VC2 14 VC1 13 VC3 15 VC4 16
SHIELD
20 SHIELD 19
C1
0.047uF
100V
C1
0.047uF
100V
Q1
PSMN075-100MSE
Q1
PSMN075-100MSE
2
4
73
16
8 5
CG1 1000pF 2KV 1808 CG1 1000pF 2KV 1808
R5 100k R5 100k
RT3 75 RT3 75
R3 3.3k R3 3.3k
RT1 75 RT1 75
R7 0 R7 0
U1
LT4275AIDD
U1
LT4275AIDD
IEEUVLO
1
AUX
2
RCLASS
3
RCLASS++
4
GND
5T2P 6
PWRGD 7
HSSRC 8
HSGATE 9
VPORT 10
GND
11
T2PT2P
R9 34.8 0805 1% R9 34.8 0805 1%
R1 0 R1 0
R2 8.2 R2 8.2
D1
PTVS58VP1UP
SOD128
D1
PTVS58VP1UP
SOD128
2 1
RT4 75 RT4 75
J2
SS-7188S-A-NF
J2
SS-7188S-A-NF
1 2 3 4 5 6 7 8
910
RT2 75 RT2 75

6
dc2125f
DEMO MANUAL DC2125
schematic Diagram
Figure 4. DC2125 Demo Circuit Schematic, Sheet 2
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
TG36 DATA2 SPARE1 TG45
TG78
SPARE2
BG78
BG45
TG12
DATA1
BG12
BG36
VPORTN VPORTP
TG12 BG12
TG36 BG36
TG45 BG45
TG78 BG78
PWRGD
DATA1 DATA2 SPARE1 SPARE2
VPORTP
VPORTN
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
03/05/2014, 10:30 AM
23
SMALL-SIZED PoE PD WITH POWER SUPPLY uMODULE
KIM T.
RYAN H.
N/A
LT4275AIDD, LT4321IUF, LTM8027EV
DEMO CIRCUIT 2125A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
03/05/2014, 10:30 AM
23
SMALL-SIZED PoE PD WITH POWER SUPPLY uMODULE
KIM T.
RYAN H.
N/A
LT4275AIDD, LT4321IUF, LTM8027EV
DEMO CIRCUIT 2125A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
03/05/2014, 10:30 AM
23
SMALL-SIZED PoE PD WITH POWER SUPPLY uMODULE
KIM T.
RYAN H.
N/A
LT4275AIDD, LT4321IUF, LTM8027EV
DEMO CIRCUIT 2125A
Q6
PSMN075-100MSE
Q6
PSMN075-100MSE
2
4
7
3
1 6
8
5
Q5
PSMN075-100MSE
Q5
PSMN075-100MSE
2
4
7
3
1 6
8
5
C3 0.047uF 100V C3 0.047uF 100V
Q8
PSMN075-100MSE
Q8
PSMN075-100MSE
2
4
7
3
1 6
8
5
Q4
PSMN075-100MSE
Q4
PSMN075-100MSE
2
4
7
3
1 6
8
5
U2
LT4321IUF
U2
LT4321IUF
TG36
1
IN36
2
IN45
3
TG45
4
TG78
5
IN78
6
BG78
7
BG45
8
OUTP 12
EN 11 EN 10
OUTN 9
TG12 16
IN12 15
BG12 14
BG36 13
EP 17
Q7
PSMN075-100MSE
Q7
PSMN075-100MSE
2
4
7
3
1 6
8
5
Q2
PSMN075-100MSE
Q2
PSMN075-100MSE
2
4
7
3
1 6
8
5
VPORTPVPORTP
R10 0 0402 R10 0 0402
Q3
PSMN075-100MSE
Q3
PSMN075-100MSE
2
4
7
3
1 6
8
5
Q9
PSMN075-100MSE
Q9
PSMN075-100MSE
2
4
7
3
1 6
8
5

7
dc2125f
DEMO MANUAL DC2125
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
schematic Diagram
Figure 5. DC2125 Demo Circuit Schematic, Sheet 3
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
12V @ 3A
VOUT+
PWRGD
VPORTN
VIN
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
03/05/2014, 10:30 AM
33
SMALL-SIZED PoE PD WITH POWER SUPPLY uMODULE
KIM T.
RYAN H.
N/A
LT4275AIDD, LT4321IUF, LTM8027EV
DEMO CIRCUIT 2125A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
03/05/2014, 10:30 AM
33
SMALL-SIZED PoE PD WITH POWER SUPPLY uMODULE
KIM T.
RYAN H.
N/A
LT4275AIDD, LT4321IUF, LTM8027EV
DEMO CIRCUIT 2125A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] 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
2
03/05/2014, 10:30 AM
33
SMALL-SIZED PoE PD WITH POWER SUPPLY uMODULE
KIM T.
RYAN H.
N/A
LT4275AIDD, LT4321IUF, LTM8027EV
DEMO CIRCUIT 2125A
+
C6 68uF 16V 7343
+
C6 68uF 16V 7343
C10
1500pF
C10
1500pF
+
C8 22uF 63V
+
C8 22uF 63V
U3
LTM8027EV
U3
LTM8027EV
VIN
H1
RT
B1
GND
A1
GND
E1
VOUT E9
BIAS1 A6
GND
A8
GND
A9
GND
A10
GND
A11
GND
B2
GND
B4
GND
B5
GND
B6
GND
B7
GND
B8
GND
B9
GND
B10
GND
B11
GND
C2
GND
C3
GND
C4
GND
C5
GND
C6
GND
C7
GND
C8
GND
C9
GND
C10
GND
C11
GND
D1
GND
D2
GND
D3
GND
D4
GND
D5
GND
D6
GND
D7
GND
D8
GND
D9
GND
D10
GND
D11
GND
E2
GND
E3
GND
E4
GND
E5
GND
E6
GND
E7
GND
E8
GND F1 GND F2 GND F3 GND F4 GND F5 GND F6 GND F7 GND F8 GND G5 GND G6 GND G7 GND G8 GND H5 GND H6 GND H7 GND H8 GND J5 GND J6 GND J7 GND J8 GND K5 GND K6 GND K7 GND K8 GND L5 GND L6 GND L7 GND L8
AUX A7
VOUT E10 VOUT E11
VOUT F9
VOUT F10
VOUT F11
VOUT G9
VOUT G10
VOUT G11
VOUT H9
VOUT H10
VOUT H11
VOUT J9
VOUT J10
VOUT J11
VOUT K9
VOUT K10
VOUT K11
VOUT L9
VOUT L10
VOUT L11
VIN
H2 VIN H3 VIN
J1 VIN J2 VIN J3 VIN
K1 VIN K2 VIN K3 VIN
L1 VIN L2 VIN L3
RUN
A4
SYNC
C1
SS
A5
BIAS2
A3
ADJ
A2
GND
B3
C9 2.2uF 100V 1210 C9 2.2uF 100V 1210
R11 2k 0805 R11 2k 0805
D2
GREEN
D2
GREEN
2 1
R12 56.2k
1%
R12 56.2k
1%
C7 0.1uF 50V C7 0.1uF 50V
E2
VOUT-
E2
VOUT-
C4 22uF 16V 1210 C4 22uF 16V 1210
VINVIN L1
10uH L1 10uH
+
C5 68uF 16V 7343
+
C5 68uF 16V 7343
E1
VOUT+
E1
VOUT+
R14
0
0402 R14
0
0402
R13 49.9k 1% R13 49.9k 1%

8
dc2125f
DEMO MANUAL DC2125
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
LT 0614 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation

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