Linear Technology LTC4266A User manual

1
dc1815afc
DEMO MANUAL DC1815A
Description
LTC4266A
Quad LTPoE++ PSE Controller
Demonstrationcircuit1815AfeaturestheLTC
®
4266Aquad
power sourcing equipment (PSE) controller, capable of
delivering up to 90W of LTPoE++™ power to a compatible
LTPoE++ powered device (PD). A proprietary detection/
classificationschemeallowsmutualidentificationbetween
an LTPoE++ PSE and LTPoE++ PD while remaining com-
patible and interoperable with existing Type 1 (13W) and
Type2(25.5W)PDs.TheLTC4266Afeaturesetisasuperset
of the popular LTC4266. These PSE controllers utilize low
RON external MOSFETs and 0.25Ω sense resistors which
are especially important at the LTPoE++ current levels to
maintain the lowest possible heat dissipation.
TheLTC4266Aisavailableinmultiple powergrades,allow-
ingdeliveredPDpowerof13W,25.5W,38.7W,52.7W,70W
and 90W. The DC1815A has four variations DC1815A-A,
DC1815A-B, DC1815A-C, and DC1815A-D which accom-
modate the four LTPoE++ power levels (Table 1).
Advanced power management features of the LTC4266A
include: a 14-bit current monitoring ADC, DAC-program-
mable current limit, and versatile quick port shutdown.
Advanced power management host software is available
under a no-cost license. PD discovery uses a proprietary
dualmode4-pointdetectionmechanismensuringexcellent
immunityfrom falsePD detection.The LTC4266Aincludes
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTPoE++ and QuikEval are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
an I2C serial interface operable up to 1MHz. Optional
I2C control is accessed on the DC1815A either with test
points or a 14-pin ribbon cable for DC590B QuikEval™
GUI operation.
TheLTC4266AisconfigurableontheDC1815AasanAUTO
pinhigh, MID pin high,autonomous midspan power injec-
tor;input datafrom anexisting networksystem issent out,
along with power
, to a PD. The LTC4266A autonomously
detects a PD, turns power on to the port, and discon-
nects port power without the need for a microcontroller.
OUTnLEDs indicate that port power is present. A single
55V supply is required to power the DC1815A. A simple
LDO regulator circuit on the board powers the digital sup-
ply of the LTC4266A. A SHDN pushbutton for each port
shuts down the respective port and disables detection.
Pre-programmed masked shutdown ports are shut down
with the MSD pushbutton. A RESET pushbutton resets the
LTC4266A to its AUTO pin logic state. Ports shut down
with the SHDN or MSD pushbutton must be re-enabled
via I2C or a device reset with the AUTO pin high.
Design files for this circuit board are available at
http://www.linear.com/demo
Table 1. DC1815A Power Levels and Power Supply
DEMO BOARD PSE CONTROLLER MAX DELIVERED PD POWER POWER SUPPLY*
DC1815A-A LTC4266A-1 38.7W 300W
DC1815A-B LTC4266A-2 52.7W 300W
DC1815A-C LTC4266A-3 70W 420W
DC1815A-D LTC4266A-4 90W 540W
*Recommended DC1815A power supply minimum to avoid drooping in a worst-case scenario with ILIM current at all four ports. Set the voltage between
54.75V to 57V for LTPoE++ compliance

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dc1815afc
DEMO MANUAL DC1815A
quick start proceDure
Figure 1. DC1815A Setup
Demonstration circuit 1815A is easy to set up for evaluat-
ing the performance of the LTC4266A. Refer to Figure 1
for proper test equipment setup and follow the procedure
below.
1. Set MID jumper JP5 to LO which disables midspan
mode.
2. Set AUTO jumper JP4 to HI which enables AUTO pin
high mode.
3. Connect a 55V to 57V power supply across AGND (+)
and VEE (–). Size the power supply considering the
maximum power delivered to the PDs.
4. Connect with an Ethernet cable an 802.3at Type 1 or
Type 2, or LTPoE++ compatible PD to one of the four
bottom ports of 2x4, RJ45 connector J1.
5. (Optional) For data tests, connect a PHY with an
Ethernet cable to one of the four top ports of 2x4, RJ45
connector J1.
6. (Optional) Connect a DC590B via ribbon cable to the
DC1814A and via USB to a PC. Open the QuikEval
software for I2C GUI interfacing.

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dc1815afc
DEMO MANUAL DC1815A
operation
Introduction
The DC1815A demonstrates the features and capabilities
of the LTC4266A, a quad controller for LTPoE++ power
sourcing equipment. The DC1815A provides a quick and
simple PSE solution requiring only a VEE supply.
Supply Voltages
Select a VEE supply with enough power to sustain all four
ports at maximum load. Table 1 shows the maximum
delivered PD power of a single port as well as a recom-
mended VEE power supply minimum to avoid drooping in
a worst-case scenario with ILIM current at all four ports.
The LTC4266A also requires a digital 3.3V supply. The
DC1815A uses a simple LDO regulator circuit to power the
3.3V digital supply from the VEE supply. The LTC4266A
VDD supply is allowed to be within 5V above or below
AGND. On the DC1815A, VDD is tied to AGND and DGND
is a negative voltage below AGND. D1, R5, Q5, R14, R15,
and R25 generate the negative voltage referenced to
AGND (Figure 2). These components are sized to handle
the power required to supply the LTC4266A and LEDs on
the DC1815A. Contact Linear Technology Applications
for 3.3V options.
AUTO Pin
The LTC4266A AUTO pin is set high or low with jumper
JP4 on the DC1815A. With the AUTO pin high after a
device reset or power on, the LTC4266A operates in fully
autonomous mode without the need for a microcontroller.
The LTC4266A will automatically detect, classify, and
power on IEEE 802.3at Type 1, Type 2 and LTPoE++ PDs
up to the power level rating of the LTC4266A version used.
For full control via I2C, the AUTO pin is to be pulled low.
Modification of the AUTO pin jumper requires a device
reset or power cycle.
Endpoint vs Midspan
The LTC4266A can be configured either for endpoint or
midspan operation by setting the MID pin high or low
respectively. This is selected with jumper JP5 on the
DC1815A. The MID pin high state enables a two second
detection back-off timer. The LTC4266A must be reset or
power-cycled for the MID pin to be detected. For proper
midspan operation the AUTO pin must also be high.
I2C Control
The LTC4266A is a slave-only I2C device, and commu-
nicates with a host using a standard SMBus/I2C 2-wire
interface. On the DC1815A, a host can be connected to
the SCL and SDA test points. Optionally, a DC590B board
can be connected with a 14-pin ribbon cable to header J6.
TheLTC4266AhasseparatepinsforSDAINandSDAOUTto
facilitatetheuseofopto-couplers.TheSDAINandSDAOUT
lines are tied together on the DC1815A with a shunt resis-
tor (R10) to provide a traditional bi-directional SDA line.
The 7-bit I2C address of the LTC4266A is 010A3A2A1A0b,
where A3through A0are determined by pins AD3 through
AD0 respectively. On the DC1815A board the state of
these pins are controlled by the quad DIP switch, S1.
All LTC4266 chips also respond to the global address
0110000b regardless of the state of their AD3-AD0 pins.
Interrupts are signaled by the LTC4266A to the host via
the INT pin. A red LED on the DC1815A indicates if the
INT line is being pulled low.
Figure 2. DC1815A LDO Circuit for the LTC4266A Digital Supply.

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dc1815afc
DEMO MANUAL DC1815A
operation
Board Layout
Proper components placement and board layout with the
LTC4266Aisimportanttoprovideelectricalrobustnessand
correct operation. The following mentioned components,
also shown in Figure 3, must be close to their respective
LTC4266A pins with no other components in between on
the connection path. Place a 0.1µF capacitor (C1) directly
across VDD and DGND. Place a 1µF, 100V capacitor (C4)
and a SMAJ58A TVS (D3) directly across AGND and VEE.
Place the OUT 0.22µF, 100V capacitors (C22, C36, C47,
and C58) directly to their respective OUT pins all going
to an AGND plane.
The power path is from VEE to the sense resistor, to the
MOSFET, and out to the port. Select a trace width appro-
priate for the maximum current.
Kelvin sensing is necessary to provide accurate current
readingsparticularlywithDCDisconnect. Thesense resis-
tors used with the LTC4266A must be 0.25Ω, 1% or better,
and with a power rating that can handle the maximum DC
current passed through them. A dedicated sense trace
from each SENSE pin of the LTC4266A must go directly
to the respective sense resistor solder pad (Figure 4). Do
not connect to a copper area or trace between the sense
resistor and the MOSFET.
Figure 3. LTC4266A Key Application Components
for Board Placement
The VEE side of the sense resistor must connect to a thick
VEE plane through several large vias. At the LTC4266A,
the VEE pins and exposed pad tie together on the top layer
and connect to the VEE plane as well through its own
multiple large vias. The via size, number of vias, copper
thickness, trace width, and number of layers that connect
VEE between the sense resistors and the LTC4266A VEE
pins must total less than 15mΩ. A 2oz. copper thickness
for the VEE copper plane must be used if there is only a
single VEE plane connecting the LTC4266A VEE pins to
the sense resistors.
The VEE current path from the sense resistors to the
main VEE power supply must be either through a copper
plane, or a thick trace. If a trace is used, it must not pass
under the LTC4266A. Instead the path must go out to VEE
from the sense resistors as shown in Figure 4. The VEE
connection is from the VEE supply to the sense resistors
to the LTC4266A VEE pins and must stay in that order.
Figure 4. LTC4266A VEE Pins and Sense Resistors Connect to a
VEE Inner Layer Plane. A Kelvin Sense Trace from each SENSE
Pin Runs to the Respective Sense Resistor Pad. Connect the VEE
Supply Path to the Sense Resistors First, Then to the LTC4266A
VEE Pins

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dc1815afc
DEMO MANUAL DC1815A
operation
When laying out multiple LTC4266A devices, group the
four sets of port MOSFET and sense resistor with their
respectiveLTC4266AasshowninFigure5.EachLTC4266A
has its own copper fill area on the surface that connects
to the VEE plane with multiple large vias. The net effect
is to reduce the layout problem down to 4-port groups;
this arrangement is expandable to any number of ports.
Figure 5. Multiple LTC4266 Layout Strategy
to Reduce Mutual Resistance
pcB Layout
Top Silkscreen Layer 1: Top Layer

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dc1815afc
DEMO MANUAL DC1815A
pcB Layout
Layer 2: Plane Layer Layer 3: Plane Layer
Layer 4: Bottom Layer Bottom Silkscreen

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dc1815afc
DEMO MANUAL DC1815A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 2 C4, C65 CAP, 0603 0.1µF 10% 25V X7R TDK C1608X7R1E104K
2 16 CT1-CT16 CAP, 0805 0.01µF 5% 100V X7R AVX 0805C103JAT2A
3 2 C64, C66 CAP, 0805 1µF 10% 100V X7S TDK C2012X7S2A105K
4 1 C2 CAP, 10uF 20% 100V ALUM. PANASONIC EEE-2AA100UP
5 4 C22, C36, C47, C58 CAP, 1206 0.22µF 5% 100V X7R AVX 12061C224JAT2A
6 10 C5, C6, CG1-CG8 CAP, 1808 1000pF 10% 2KV X7R TDK C4520X7R3D102K
7 2 J2, J3 CONN, JACK, BANANA KEYSTONE 575-4
8 1 J1 CONN, RJ45, 8-PORT DUAL ROW SHIELDED TE CONNECTIVITY, 5569262-1
9 1 CLD1 DIODE, CURRENT LIMITING, 2.7mA, SOD-80 CENTRAL SEMI CCLM2700
10 8 D8-D11, D24-D27 DIODE, RECTIFIER, 100V 1A, SMA FAIRCHILD S1B
11 1 D3 DIODE, TVS, 400W, 58V, SMA DIODES INC. SMAJ58A
12 2 D18, D20 DIODE, TVS, 5000W, 60V, SMC LITTLEFUSE 5.0SMDJ60A
13 1 D1 DIODE, ZENER 3.9V SOD-123 ON SEMI, MMSZ4686T1G
14 1 D23 DIODE, ZENER, 5.6V, SOT23 FAIRCHILD, BZX84C5V6
15 1 J6 HEADER, 2 ×7 2mm MOLEX 87831-1420
16 2 JP4, JP5 HEADER, 3-PIN, 2mm SAMTEC TMM-103-02-L-S
17 1 U3 IC, 24LC025, EEPROM, TSSOP MICROCHIP 24LC025-I/ST
18 2 D5, D7 LED, AMBER ROHM SML-010DTT86L
19 4 D12-D15 LED, GREEN ROHM SML-010FTT86L
20 1 D6 LED, RED ROHM SML-010VTT86L
21 16 F-1-F16 FUSE, 3A, 63VDC 1206 BEL FUSE C1Q3
22 1 R9 RES, 0603 1Ω 5% 1/10W VISHAY CRCW06031R00JNEA
23 1 R10 RES, 0603 10Ω 5% 1/10W VISHAY CRCW060310R0JNEA
24 1 R5 RES, 0603 100k 5% 1/10W VISHAY CRCW0603100KJNEA
25 2 R1, R2 RES, 0603 10k 5% 1/10W VISHAY CRCW060310K0JNEA
26 6 R8, R13, R18, R21, R24, RL1 RES, 0603 1.0k 5% 1/10W VISHAY CRCW06031K00JNEA
27 4 R7, R17, R20, R23 RES, 0603 10M 5% 1/10W VISHAY CRCW060310M0JNEA
28 4 R6, R16, R19, R22 RES, 0603 2M 5% 1/10W VISHAY CRCW0603910KJNEA
29 3 REP3-REP5 RES, 0603 5.1k 5% 1/10W VISHAY CRCW06035K10JNEA
30 32 RT1-RT32 RES, 0603 75Ω 5% 1/10W VISHAY CRCW060375R0JNEA
31 3 R14, R15, R25 RES, 1206 4.7k 5% 1/4W VISHAY CRCW12064K70JNEA
32 4 RS1-RS4 RES, 2512, 0.25Ω 1% 2W STACKPOLE, CSRN2512FKR250
33 4 MH1-MH4 STAND-OFF, NYLON 0.75" KEYSTONE, 8834(SNAP ON)
34 1 S1 SWITCH, DIP 4-POSITION TYCO/ALCOSWITCH ADE04
35 6 S2-S7 SWITCH, MOMENTARY WÜRTH 434 123 050 816
36 16 E1-E16 TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0
37 4 T1-T4 TRANSFORMER, POE++
(OPTION)
MIDCOM WÜRTH 749022016
COILCRAFT ETH1-460L
38 4 Q9-Q12 XSTR, MOSFET P-CHANNEL 30V (D-S), SOT-23 VISHAY Si2343DS
39 4 Q1-Q4 XSTR, MOSFET, N-CHANNEL 100V FAIRCHILD FDMC86102
40 1 Q5 XSTR, PNP, 100V, SOT223 ZETEX ZXTP19100CG

8
dc1815afc
DEMO MANUAL DC1815A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
41 3 XJP4, XJP5 SHUNT, 2mm SAMTEC 2SN-BK-G
42 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1815A-2
43 2 STENCIL TOP & BOTTOM DC1815A-2
DC1815A-A
1 1 DC1815A GENERAL BOM
2 16 FB1-FB16 FERRITE BEAD, 1k, 0805 TDK MPZ2012S102A
3 1 U1 IC, LTC4274A-1, QUAD PORT 38.7W PSE CONTROLLER LINEAR LTC4274AIUHF-1
4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1815A
DC1815A-B
1 1 DC1815A GENERAL BOM
2 16 FB1-FB16 FERRITE BEAD, 1k, 0805 TDK MPZ2012S102A
3 1 U1 IC, LTC4266A-2 QUAD PORT 52.7W PSE CONTROLLER LINEAR LTC4266AIUHF-2
4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1815A
DC1815A-C
1 1 DC1815A GENERAL BOM
2 16 FB1-FB16 FERRITE BEAD, 1k, 0805 TDK MPZ2012S102A
3 1 U1 IC, LTC4266A-3, QUAD PORT 70W PSE CONTROLLER LINEAR LTC4266AIUHF-3
4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1815A
DC1815A-D
1 1 DC1815A GENERAL BOM
2 16 FB1-FB16 FERRITE BEAD, 1300Ω, 1812 TAIYO YUDEN FBMH4532HM132-T
3 1 U1 IC, LTC4266A-4, QUAD PORT 90W PSE CONTROLLER LINEAR LTC4266AIUHF-4
4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1815A

9
dc1815afc
DEMO MANUAL DC1815A
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
VEE
( 55V to 57V )
AGND (+)
VEE (-)
MSD
RESET
VDD
CSRN2512FKR250
CSRN2512FKR250
CSRN2512FKR250
CSRN2512FKR250
ADDRESS
LO
HI
100V 100V 100V 100V
AD0
AD1
AD2
AD3
INT
DGND
VDD
SD1 SD2 SD3 SD4
VEE AGND
INT
AGND
AGND
OUT1 OUT2
OUT3 OUT4
MAIN SUPPLY IN
TM
2. INSTALL SHUNTS AS SHOWN. 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
MPZ2012S102A
FBMH4532HM132-T
ASSEMBLY VERSION -WATT PSE U1
-A 38.7W LTC4266AIUHF-1
-B 52.7W LTC4266AIUHF-2 -C 70W LTC4266AIUHF-3 -D 90W LTC4266AIUHF-4
MPZ2012S102A MPZ2012S102A
FB1 - FB16
2
_PRODUCTION DILIAN R. 5/4/11
1206 1206 1206
1808
1808
2KV
2KV 0805
0805 1206 1206 1206 1206
(-3.3V)
_2a PWR LEVEL UPDATE DILIAN R. 10/5/11 _2b T1-T4 OPTION DILIAN R. 3/28/13
MID
AUTO
SCL
SDAOUT
SCL
SDAIN
OUT4
OUT1
OUT3
OUT2
SCL
SDAIN
SDAOUT
VDD
VDD
VEE
VEE
VEE
VEE
VDD
VDD
VEE
VDD VDD
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
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
2
Thursday, March 28, 2013
1 3
QUAD PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
N/A
LTC4266AIUHF FAMILY
DEMO CIRCUIT 1815A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
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
2
Thursday, March 28, 2013
1 3
QUAD PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
N/A
LTC4266AIUHF FAMILY
DEMO CIRCUIT 1815A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
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
2
Thursday, March 28, 2013
1 3
QUAD PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
N/A
LTC4266AIUHF FAMILY
DEMO CIRCUIT 1815A
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
E6E6
R2 10K R2 10K
RS3 0.25 RS3 0.25
R1
10K
R1
10K
S7S7
RS2 0.25 RS2 0.25
R13 1.0K R13 1.0K
C47 0.22uF X7R C47 0.22uF X7R
Q3
FDMC86102
Q3
FDMC86102
JP5
HI LO
MID JP5
HI LO
MID
1 3 2
D10 S1B D10 S1B
C36 0.22uF X7R C36 0.22uF X7R
D7
AMBER
D7
AMBER
D27 S1B D27 S1B
E5E5
C66 1uF 100V C66 1uF 100V
+
C2
10uF 100V
+
C2
10uF 100V
C22 0.22uF X7R C22 0.22uF X7R D9
S1B D9 S1B
D5
AMBER
D5
AMBER
S3S3
C5
1000pF
C5
1000pF
J3J3
R5
100K
R5
100K
D1 3.9V D1 3.9V
E9E9
R25 4.7K R25 4.7K
S4S4
S5S5
E8E8
E4E4
E1E1
J2J2
RL1 1.0K RL1 1.0K
SMAJ58A
D3
SMAJ58A
D3
D26 S1B D26 S1B
5.0SMDJ60A
D18
5.0SMDJ60A
D18 D8
S1B D8 S1B
RS1 0.25 RS1 0.25
Q5
ZXTP19100CG
Q5
ZXTP19100CG
5.0SMDJ60A
D20
5.0SMDJ60A
D20
Q2
FDMC86102
Q2
FDMC86102
R9 1 R9 1
C6
1000pF
C6
1000pF
D23
5.6V
D23
5.6V
1 3
C64 1uF 100V C64 1uF 100V
E3E3
CLD1
CCLM2700
CLD1
CCLM2700
Q4
FDMC86102
Q4
FDMC86102
JP4
HI LO
AUTO JP4
HI LO
AUTO
1
3 2
R10 10 R10 10
D24 S1B D24 S1B
RS4 0.25 RS4 0.25
D25 S1B D25 S1B
E10E10
D11 S1B D11 S1B
R14 4.7K R14 4.7K
C65 0.1uF C65 0.1uF
Q1
FDMC86102
Q1
FDMC86102
D6 RED D6 RED
E2E2
S6S6
E7E7
R15 4.7K R15 4.7K
E14E14
U1
LTC4266AIUHF
U1
LTC4266AIUHF
VEE
26
AGND
18
OUT 4
21
GATE 4
20
SENSE 4
19
SENSE 3
22
GATE 3
23
OUT 3
24
SENSE 2
27
GATE 2
28
OUT 2
29
SENSE 1
30
GATE 1
31
OUT 1
32
VEE
25
DGND
10
AD0 7
AD1 6
AD2 5
AD3 4
SCL 38
SDAIN 3
SDAOUT 1
INT37
SD1 14
SD2 15
SD3 16
SD4 17
VDD
13
AUTO33
MID36
RESET35
MSD34
VEE
39
S2S2
S1S1
1
2
3 4
8
7
6 5
C58 0.22uF X7R C58 0.22uF X7R

10
dc1815afc
DEMO MANUAL DC1815A
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
DATA IN
DATA IN
POWER AND DATA OUT
DATA IN
DATA IN
TM
CONNECTOR SHIELDING
PORT 1
POWER AND DATA OUT
POWER AND DATA OUT
POWER AND DATA OUT
PORT 2
PORT 3
PORT 4
2
_PRODUCTION DILIAN R. 5/4/11
_2a PWR LEVEL UPDATE DILIAN R. 10/5/11 _2b T1-T4 OPTION DILIAN R. 3/28/13
T1,T2,T3,T4: WURTH 749022016 COILCRAFT ETH1-460L NOTE: FOR TEMPERATURE SENSITIVE 90W APPLICATIONS, TWO OF THE 749012013 MAY BE USED AS AN ALTERNATE TO EACH T1, T2, T3, and T4 WHICH HAS A HIGHER CURRENT RATING
OUT1
OUT2
OUT3
OUT4
OUT1
OUT2
OUT3
OUT4
SIZE DATE:
.VER.ONCI
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TITLE:
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PCB DES.
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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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Thursday, March 28, 2013
2 3
QUAD PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
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LTC4266AIUHF FAMILY DEMO CIRCUIT 1815A
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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
Thursday, March 28, 2013
2 3
QUAD PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
N/A
LTC4266AIUHF FAMILY DEMO CIRCUIT 1815A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
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Phone: [phone]
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
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2
Thursday, March 28, 2013
2 3
QUAD PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
N/A
LTC4266AIUHF FAMILY DEMO CIRCUIT 1815A
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
CT5 0.01uF
0805
CT5 0.01uF
0805
FB3FB3
J1-4
RJ45 5569262-1
J1-4
RJ45 5569262-1
4-1
31
4-2
32
4-3
33
4-4
34
4-5
35
4-6
36
4-7
37
4-8
38
RT32 75RT32 75
FB13FB13
F12
3A, 1206
C1Q 3
F12
3A, 1206
C1Q 3
CT12 0.01uF
0805
CT12 0.01uF
0805
F10
3A, 1206
C1Q 3
F10
3A, 1206
C1Q 3
RT12 75RT12 75
SHIELD
J1-13
RJ45 5569262-1
SHIELD
J1-13
RJ45 5569262-1
S1
121
S2
122
S3
123
S4
124
S5
125
S6
126
S7
127
S8
128
S9
129
RT23 75 RT23 75
RT8 75RT8 75
RT25 75RT25 75
RT10 75 RT10 75
RT13 75RT13 75
RT1 75RT1 75
CG6 1000pF 2kV 1808 CG6 1000pF 2kV 1808
J1-2
RJ45 5569262-1
J1-2
RJ45 5569262-1
2-1
11
2-2
12
2-3
13
2-4
14
2-5
15
2-6
16
2-7
17
2-8
18
FB7FB7
CT2 0.01uF
0805
CT2 0.01uF
0805
CT7 0.01uF
0805
CT7 0.01uF
0805
FB6FB6
FB2FB2
F13
3A, 1206
C1Q 3
F13
3A, 1206
C1Q 3
FB4FB4
RT15 75 RT15 75
F1
3A, 1206
C1Q 3 F1
3A, 1206
C1Q 3
FB11FB11
F15
3A, 1206
C1Q 3
F15
3A, 1206
C1Q 3
FB10FB10
RT21 75 RT21 75
CT14 0.01uF
0805
CT14 0.01uF
0805
RT19 75 RT19 75
RT28 75 RT28 75
CT9 0.01uF
0805
CT9 0.01uF
0805
CG3
1000pF
2kV
1808
CG3
1000pF
2kV
1808
F6
3A, 1206
C1Q 3
F6
3A, 1206
C1Q 3
RT2 75RT2 75
FB14FB14
CT16 0.01uF 0805 CT16 0.01uF 0805
RT5 75RT5 75
CG8 1000pF 2kV 1808 CG8 1000pF 2kV 1808
J1-8
RJ45 5569262-1
J1-8
RJ45 5569262-1
8-1
71
8-2
72
8-3
73
8-4
74
8-5
75
8-6
76
8-7
77
8-8
78
F8
3A, 1206
C1Q 3 F8
3A, 1206
C1Q 3
CT11 0.01uF
0805
CT11 0.01uF
0805
F11
3A, 1206
C1Q 3 F11
3A, 1206
C1Q 3
RT31 75 RT31 75
RT22 75 RT22 75
CG4 1000pF 2kV 1808 CG4 1000pF 2kV 1808
T4T4
2
22
3
24
23
1
5 4
6
8
7
9
11 10 12
20
21
19
17
18 16 14 15 13
RT4 75RT4 75
J1-6
RJ45 5569262-1
J1-6
RJ45 5569262-1
6-1
51
6-2
52
6-3
53
6-4
54
6-5
55
6-6
56
6-7
57
6-8
58
FB16FB16
F9
3A, 1206
C1Q 3
F9
3A, 1206
C1Q 3
CT1 0.01uF
0805
CT1 0.01uF
0805
J1-5
RJ45 5569262-1
J1-5
RJ45 5569262-1
5-1 41
5-2 42
5-3 43
5-4 44 5-5 45 5-6 46
5-7 47
5-8 48
RT30 75RT30 75
CT3 0.01uF
0805
CT3 0.01uF
0805
J1-7
RJ45 5569262-1
J1-7
RJ45 5569262-1
7-1 61
7-2 62
7-3 63
7-4 64
7-5 65
7-6 66
7-7 67
7-8 68
FB1FB1
CT6 0.01uF
0805
CT6 0.01uF
0805
RT18 75 RT18 75
RT11 75 RT11 75
FB15FB15
F3
3A, 1206
C1Q 3
F3
3A, 1206
C1Q 3
F2 3A, 1206 C1Q 3 F2 3A, 1206 C1Q 3
FB12FB12
RT16 75 RT16 75
RT7 75RT7 75
F14
3A, 1206
C1Q 3
F14
3A, 1206
C1Q 3
CG1
1000pF
2kV
1808
CG1
1000pF
2kV
1808
RT14 75RT14 75
CT8 0.01uF
0805
CT8 0.01uF
0805
RT20 75 RT20 75
F16
3A, 1206
C1Q 3
F16
3A, 1206
C1Q 3
RT29 75 RT29 75
F4
3A, 1206
C1Q 3
F4
3A, 1206
C1Q 3
RT24 75 RT24 75
CG5
1000pF
2kV
1808
CG5
1000pF
2kV
1808
RT9 75RT9 75
RT17 75 RT17 75
CG2 1000pF 2kV 1808 CG2 1000pF 2kV 1808
CT10 0.01uF
0805
CT10 0.01uF
0805
F5
3A, 1206
C1Q 3
F5
3A, 1206
C1Q 3
RT27 75 RT27 75
CG7
1000pF
2kV
1808
CG7
1000pF
2kV
1808
CT13 0.01uF
0805
CT13 0.01uF
0805
J1-3
RJ45 5569262-1
J1-3
RJ45 5569262-1
3-1 21
3-2 22
3-3 23 3-4 24
3-5 25
3-6 26
3-7 27 3-8 28
T2T2
2
22
3
24
23
1
5 4
6
8
7
9
11
10
12
20 21
19
17
18
16
14
15
13
RT26 75 RT26 75
FB9FB9
CT4 0.01uF
0805
CT4 0.01uF
0805
T3T3
2
223 24
23
1
5 4
6
8 7
9
11
10 12
20 21
19
17 18
16 14
15
13
CT15 0.01uF
0805
CT15 0.01uF
0805
F7
3A, 1206
C1Q 3
F7
3A, 1206
C1Q 3
RT6 75RT6 75
J1-1
RJ45 5569262-1
J1-1
RJ45 5569262-1
1-1 1 1-2 2
1-3 3 1-4 4
1-5 5
1-6 6
1-7 7 1-8 8
FB5FB5
RT3 75RT3 75
FB8FB8
T1T1
2
223
24
23
1
5
4
6
8
7
9
11 10
12
20
21
19
17 18
16
14 15 13

11
dc1815afc
DEMO MANUAL DC1815A
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
OUT1 OUT2 OUT3 OUT4
OPTIONAL LED DRIVE
TM
MOUNTING HOLES
TO DC590
WP
QUICKEVAL FOR DEMO ONLY
DGND
DGND
SCL
SDAIN
SDAOUT
2
_PRODUCTION DILIAN R. 5/4/11
_2a PWR LEVEL UPDATE DILIAN R. 10/5/11
_2b T1-T4 OPTION DILIAN R. 3/28/13
SCL
SDAIN
SDAOUT
OUT3
OUT4
OUT1
OUT2
SCL
SDAIN
SDAOUT
VDD
VDD
VDD
VDD
VDD
VDD
VDD
VDD
SIZE DATE:
.VER.ONCI
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TITLE:
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PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
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Phone: [phone]
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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
Thursday, March 28, 2013
3 3
QUAD PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
N/A
LTC4266AIUHF FAMILY DEMO CIRCUIT 1815A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
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
2
Thursday, March 28, 2013
3 3
QUAD PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
N/A
LTC4266AIUHF FAMILY DEMO CIRCUIT 1815A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
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
2
Thursday, March 28, 2013
3 3
QUAD PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
N/A
LTC4266AIUHF FAMILY DEMO CIRCUIT 1815A
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
R16
910K
R16
910K R22
910K
R22
910K
D14 GRN D14 GRN
REP5
5.1K
REP5
5.1K
E13E13
D13 GRN D13 GRN
R17 10M R17 10M
Q11
Si2343DS
Q11
Si2343DS
1
2
3
R21 1.0K R21 1.0K
R19
910K
R19
910K
REP4
5.1K
REP4
5.1K
E15E15
MH1MH1
1
R8 1.0K R8 1.0K
R7 10M R7 10M R24
1.0K R24 1.0K
U3 24LC025U3 24LC025
A0 1
A1 2
A2 3
VSS 4
VCC
8
WP
7
SCL
6
SDA
5
TP29TP29
D15 GRN D15 GRN
Q12
Si2343DS
Q12
Si2343DS
1
2
3
MH2MH2
1
E11E11
E16E16
C4 0.1uFC4 0.1uF
MH5MH5
1
D12 GRN D12 GRN
REP3
5.1K
REP3
5.1K
Q10
Si2343DS
Q10
Si2343DS
1
2 3
E12E12
R20 10M R20 10M
R18 1.0K R18 1.0K
R6
910K
R6
910K
Q9
Si2343DS
Q9
Si2343DS
1
2
3
MH3MH3
1
J6J6
1 3
2 4
5 6
7 8
9 10
11
13
12
14
R23 10M R23 10M
MH4MH4
1
MH6MH6
1

12
dc1815afc
DEMO MANUAL
DC1815A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2011
LT 0613 REV C • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
Thisdemonstration board (DEMO BOARD)kit being sold orprovidedby Linear Technology is intendedforuse for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC 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 LTC 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. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC 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 LTC applica-
tion engineer.
Mailing Address:
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Copyright © 2004, Linear Technology Corporation