Linear Technology DC1788B Quick setup guide

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DEMO MANUAL DC1788B
Description
LT4275
LTPoE++, IEEE 802.3at/
IEEE 802.3af Compliant
PD Controller
Demonstrationcircuit1788BfeaturestheLT
®
4275,afourth
generation powered device (PD) controller for Power over
Ethernet (PoE) applications.
TheDC1788B isavailable inDC1788B-A, DC1788B-B,and
DC1788B-C versions to meet the power level required by
the PD application. The DC1788B-A features the LT4275A
PD controller. This controller supports the IEEE 802.3at
(Type 2, PoE+), IEEE 802.3af (Type 1, PoE) and LTPoE++™
specification. LTPoE++ adds four power levels to the ex-
isting IEEE standard with 38.7W, 52.7W, 70W, and 90W
of delivered PD power at the RJ45 jack. The DC1788B-B
features the LT4275B PD controller and is compliant with
the IEEE 802.3at and IEEE 802.3af specifications. The
DC1788B-C features the LT4275C PD controller and is
compliant with the IEEE 802.3af specification.
The DC1788B includes an RJ45 Ethernet port, a high
power Ethernet magnetic, a discrete active bridge recti-
fier, a surge protector, an external N-channel FET, and the
LT4275. The discrete active bridge rectifier is used to
achieve higher efficiency than a conventional diode bridge
rectifier. Many of the main features from the previous gen-
eration PD controller are included in this generation PD
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTPoE++ and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
controller. These include a power good indicator, a power
sourcing equipment (PSE) type indicator, and support
for an auxiliary power input. The major difference from
the previous generation PD controller is that the LT4275
drives an external N-channel Hot Swap™ FET at the PoE
high side voltage rail. This allows the user to choose a low
RDS(ON) N-channelMOSFETto maximizepower efficiency,
reduce heat dissipation, and ease thermal design. An LED
status indicator is included to indicate the Hot Swap FET
is fully turned on and the PSE is powering the PD. A suf-
ficient load to sink more than 10mA is also included to
assure the PSE maintains power to the PD and to meet
the DC maintain power signature current required by the
IEEE 802.3at/IEEE 802.3af specification.
Simply connect the output of the DC1788B to the DC/DC
converterthatisrightfortheapplication.LinearTechnology
offers a variety of DC/DC converter solutions that can be
used with the DC1788B (eg DC894, DC1317, etc).
Design files for this circuit board are available at
http://www.linear.com/demo
Table 1. Summary of Features Supported by the DC1788B Assemblies
ASSEMBLY PoE STANDARD
MAXIMUM POWER
LEVEL
POWER GOOD
INDICATOR (PWRGD)
PSE TYPE INDICATOR
(T2P)
AUXILIARY SUPPLY
SUPPORT
DC1788B-A LTPoE++
PoE+
PoE
90W Yes Yes No
DC1788B-B PoE+
PoE 25.5W Yes Yes Yes
DC1788B-C PoE 13W Yes No Yes

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DEMO MANUAL DC1788B
Table 2. DC1788B Performance Summary
PARAMETER CONDITION VALUE
PD Input Voltage After Start-Up (VPORT) At the PD Ethernet Port
LTPoE++ 38.7W 49.8V to 57V
LTPoE++ 52.7W 47.8V to 57V
LTPoE++ 70W 45.1V to 57V
LTPoE++ 90W 41.0V to 57V
IEEE 802.3at (Type 2, 25.5W) 42.5V to 57V
IEEE 802.3af (Type 1, 13W) 37V to 57V
Efficiency DC1788B-A, VPORT = 48V, ILOAD = 1.1A 99.1% (Typical)
DC1788B-B, VPORT = 48V, ILOAD = 600mA 98.9% (Typical)
DC1788B-C, VPORT = 48V, ILOAD = 350mA 99.1% (Typical)
PoE Type Switching Frequency An LTPoE++ PSE is Powering a DC1788B-A 840Hz
performance summary
theory of operation
WhenanLTPoE++PSEis connected tothe DC1788Bdemo
board RJ45 connector, J1, via a CAT5e or CAT6 Ethernet
cable, the PSE initiates the detection process. During this
process, the discrete active bridge acts as a standard
diode bridge and the PD solution presents a 25k resistive
load to the PSE. After the PD has passed the detection
process, the PSE uses an IEEE 802.3at/IEEE 802.3af or
LTPoE++ classification method to determine the power
level the PSE can deliver to the PD. The PSE turns on the
port and provides power to the PD if the classification is
successful. During turn on, the MOSFETs of the discrete
active bridge are fully enhanced with low RDS(ON) in the
highcurrentpath.Thisreducesthepowerandheatdissipa-
tion compared to the conventional diode bridge. Once the
LT4275 detects the PSE has turned on the port, it drives
an external N-channel MOSFET to ramp up the output
voltage. After a successful PD controller output turn on,
the LT4275 drives a power good indicator (PWRGD) and
a PSE Type indicator (T2P) (DC1788B-A and DC1788B-B
only).The PWRGDindicator signals the loadto startdraw-
ing current and the T2P indicator signals the load the type
of PSE powering the PD.
Classification Signaling
The resistors at RCLS and RCLS++ determine the clas-
sification signature and sequence. The DC1788B-A in-
cludes user-selectable jumpers to support IEEE 802.3af,
IEEE 802.3at, and LTPoE++ power levels from 3.84W to
90W. Refer to Table 3 for the power levels. If an LTPoE++
power level is selected, an IEEE 802.3af or IEEE 802.3at
compliant PSE will classify this PD as a Class 4 PD. The
DC1788B-BincludesapreselectedRCLS resistortosupport
IEEE802.3at2-eventclassificationandthisboarddoesnot
contain jumper blocks. The DC1788B-C includes multiple
jumpers to support all IEEE 802.3af power levels. Table 3
showseachshuntpositionanditsassociatedclassnumber
and power level for the DC1788B-A and -C boards. Use
Table3 as a selection guide to choose a suitable power
level for the load.
Table 3. DC1788B-A and DC1788B-C Shunt Positions for PoE
Power Levels
ASSEMBLY
PoE
CLASS
POWER LEVEL AT
THE PD INPUT RCLASS JUMPERS
DC1788B-A & -C 0 13W JP1 JP2
DC1788B-A & -C 1 3.84W JP3 JP4
DC1788B-A & -C 2 6.49W JP5 JP6
DC1788B-A & -C 3 13W JP7 JP8
DC1788B-A 4 25.5W JP9 JP10
DC1788B-A 4* 38.7W JP11 JP12
DC1788B-A 4* 52.7W JP13 JP14
DC1788B-A 4* 70W JP15 JP16
DC1788B-A 4* 90W JP17 JP18
*An LTPoE++ PD will be classified as Class 4 by an IEEE 802.3at/af
compliant PSE.

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DEMO MANUAL DC1788B
Power Good Indicator and Power Supply Start-Up
The LT4275 limits the inrush current to the output bulk
capacitor by controlling the output voltage slew rate
during turn-on. The slew rate is preprogrammed via a
resistor and a capacitor at the LT4275 HSGATE pin on the
DC1788B to limit the inrush current to the bulk capacitor
on board. If more capacitance is desired at the output,
refer to Inrush and Powered On section in the LT4275
data sheet to recalculate the inrush current and ensure it
is below the IEEE requirement of approximately 100mA.
The inrush current limit will cause startup problems if an
attached load draws more than 100mA of current during
inrush. Therefore, it is strongly recommended to use the
PWRGD indicator on the DC1788B to interface to a load
such as a DC/DC converter as shown in Figures 1, 2 and 4.
PSE Type Indicator
Refer to Table 4 for the summary of T2P indicator signals
supported by the DC1788B assembly. The T2P signal is
validafterPWRGDisactive.Thisindicatorisnotconnected
on the DC1788B-C.
Table 4. Summary of T2P Signals Supported by the DC1788B
Assemblies
ASSEMBLY PSE TYPE T2P SIGNAL
DC1788B-A LTPoE++ 840Hz, 50% Duty Cycle
IEEE 802.3at (Type 2, PoE+) Logic Low
IEEE 802.3af (Type 1, PoE) Logic High
DC1788B-B LTPoE++ Logic Low
IEEE 802.3at (Type 2, PoE+) Logic Low
IEEE 802.3af (Type 1, PoE) Logic High
DC1788B-C Any PSE Not Supported
theory of operation
Auxiliary Supply Support
The DC1788B-B and DC1788B-C versions support an
auxiliary supply input. The auxiliary supply input has pri-
ority over the PoE input. When the PD controller detects
a valid voltage from the auxiliary supply input, it turns off
the N-channel MOSFET (Q2) to cut the power from the
PSE and lets the auxiliary supply take over powering the
load. The PSE may detect the disconnected PD and turn
off the port. The PWRGD indicator outputs a logic high
signal when an auxiliary supply is present. The T2P indi-
cator outputs a logic low signal on the DC1788B-B board
when an auxiliary supply is present. The auxiliary supply
input is an assembly option on the DC1788B-A board.
DC1788B Companion PSE Demo Boards
Linear Technology offers a variety of PSE solutions to
evaluate with DC1788B. Refer to Table 5 to select a PSE
demo board based on the DC1788B assembly and the
application power requirement.
Table 5. Selection of Companion PSE Demo Board depending
on the DC1788 Assembly and the PoE Power Level
DC1788
ASSEMBLY
PoE POWER
LEVEL
COMPANION PSE DEMO
BOARD
DC1788B-A 90W DC1814A-D
70W DC1814A-C
52.7W DC1814A-B
38.7W DC1814A-A
DC1788B-B 25.5W DC1567A
DC1788B-C 13W DC981A/B
**Contact Linear for multi-port PSE demo board options.

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DEMO MANUAL DC1788B
Dc1788B-a quick start proceDure
NOTE: Handle the DC1788B-A by the edge of the board.
Power over Ethernet Input
1. Refer to Figure 1 to evaluate the DC1788B-A with a
DC/DCconverter.Ifaresistiveloadisusedtoevaluatethe
DC1788B-A, connect the load by hand between VOUT+
and VOUT– after the LED (D3) is lit. It is recommended
to disconnect the resistive load before powering down
theDC1788B-A,soatthenextturnontheloadisdiscon-
nected. If the load is not connected and disconnected
by hand properly, the PD may not power on. Contact
field applications engineers for further details.
2. Default class select shunt positions are at JP1 and JP2
onthe DC1788B-Aboard.Inthisconfiguration,anyPSE
will turn on this PD. Choose a power level from Table3
and select the corresponding shunt positions.
3. Check the power delivery capability of the LTPoE++
PSE to ensure it can power the PD and the load. Do
not select a jumper position corresponding to a higher
power level than the LTPoE++ PSE can provide. Oth-
erwise, the LTPoE++ PSE will not turn on the PD after
classification.
4. Connect the output of the PSE to the RJ45 connector
(J1) on the DC1788B-A board with a CAT5e or CAT6
Ethernet cable.
5. After connection has been established, verify that the
LED (D3) is lit. This indicates the PSE has successfully
detected and powered the PD
Figure 1. Setup Diagram for the DC1788B-A with a DC/DC Converter, a Microprocessor, and an LTPoE++ PSE

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DEMO MANUAL DC1788B
Dc1788B-B quick start proceDure
NOTE: Handle the DC1788B-B by the edge of the board.
Power over Ethernet Input
1. Refer to Figure 2 to evaluate the DC1788B-B with a
DC/DCconverter.Ifaresistiveloadisusedtoevaluatethe
DC1788B-B, connect the load by hand between VOUT+
and VOUT– after the LED (D3) is lit. It is recommended
to disconnect the resistive load before powering down
theDC1788B-B,soatthenextturnontheloadisdiscon-
nected. If the load is not connected and disconnected
by hand properly, the PD may not power on. Contact
field applications engineers for further details.
2. Connect the output of the PSE to the RJ45 connector
(J1) on the DC1788B-B board with a CAT5e or CAT6
Ethernet cable.
3. After connection has been established, verify that the
LED (D3) is lit. This indicates the PSE has successfully
detected and powered the PD.
Auxiliary Supply Input
1. Refer to Figure 3 to evaluate the DC1788B-B with a
DC/DC converter and an auxiliary DC power supply.
2. Connect the auxiliary supply to the AUX+ to AUX– in-
puts. Check to make sure the voltage polarity is correct
before turning on the auxiliary power supply.
3. Turn on the auxiliary power supply and verify that the
LED (D3) is lit.
Figure 2. Setup Diagram for the DC1788B-B with a DC/DC Converter, a Microprocessor, and a Type 2 PSE

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DEMO MANUAL DC1788B
Dc1788B-B quick start proceDure
Figure 3. Setup Diagram for the DC1788B-B with a DC/DC Converter, a Microprocessor, and an Auxiliary DC Power Supply

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DEMO MANUAL DC1788B
NOTE: Handle the DC1788B-C by the edge of the board.
Power over Ethernet Input
1. Refer to Figure 4 to evaluate the DC1788B-C with a
DC/DCconverter.Ifaresistiveloadisusedtoevaluatethe
DC1788B-C, connect the load by hand between VOUT+
and VOUT– after the LED (D3) is lit. It is recommended
to disconnect the resistive load before powering down
theDC1788B-C,soatthenextturnontheloadisdiscon-
nected. If the load is not connected and disconnected
by hand properly, the PD may not power on. Contact
field applications engineers for further details.
2. Connect the output of the PSE to the RJ45 connector
(J1) on the DC1788B-C board with a CAT5e or CAT6
Ethernet cable.
3. After connection has been established, verify that the
LED (D3) is lit. This indicates the PSE has successfully
detected and powered the PD.
Auxiliary Supply Input
1. Refer to Figure 5 to evaluate the DC1788B-C with a
DC/DC converter and an auxiliary DC power supply.
2. Connect the auxiliary supply to the AUX+ to AUX– in-
puts. Check to make sure the voltage polarity is correct
before turning on the auxiliary power supply.
3. Turn on the auxiliary power supply and verify that the
LED (D3) is lit.
Figure 4. Setup Diagram for the DC1788B-C with a DC/DC Converter and a Type 1 PSE
Dc1788B-c quick start proceDure

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DEMO MANUAL DC1788B
Dc1788B-c quick start proceDure
Figure 5. Setup Diagram for the DC1788B-C with a DC/DC Converter and an Auxiliary DC Power Supply

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DEMO MANUAL DC1788B
quick start proceDure
Figure 6. DC1788B-A Efficiency at Various PoE Load Currents (without LED D3)
Figure 7. Thermal Image. DC1788B-A with 90W Load. Top View

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DEMO MANUAL DC1788B
quick start proceDure
Figure 8. Thermal Image. DC1788B-A with 90W Load. Bottom View

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DEMO MANUAL DC1788B
parts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
DC1788B General BOM
1 1 C1 Cap., X7R, 0.1µF, 100V, 10%, 0805 TDK, C2012X7R2A104K
2 1 C3 Cap., X7R, 47nF, 100V, 10%, 0805 AVX, 08051C473KAT2A
3 1 CG1 Cap., X7R, 1nF, 2KV, 10%, 1808 TDK, C4520X7R3D102K
4 4 CT1, CT2, CT3, CT4 Cap., X7R, 0.01µF, 10%, 200V, 0805 AVX, 08052C103KAZ2A
5 1 D2 Diode, SMBJ58A, SMB-DIODE DIODES INC., SMBJ58A-13-F
6 8 D4-D7, D17-D20 Diode, MMSZ5242BS, SOD-323 DIODES INC., MMSZ5242BS
7 8 D8-D11, D13-D16 Diode, MMBD4148, SOT23 FAIRCHILD, MMBD4148
8 4 Q3-Q6 Trans., MMBT3904, SOT23 FAIRCHILD, MMBT3904
9 4 Q9-Q12 Trans., MMBT3906, SOT23 FAIRCHILD, MMBT3906
10 1 R12 Res., Chip, 8.2Ω, 5%, 0603 VISHAY, CRCW06038R20JNEA
11 1 R13 Res., Chip, 3.3k , 5%, 0603 VISHAY, CRCW06033K3JNEA
12 1 R14 Res., Chip, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA
13 8 R18-R21, R43-R46 Res., Chip, 100k, 5%, 0402 VISHAY, CRCW0402100KJNEA
14 8 R23, R25, R27, R29, R34, R36, R38, R40 Res., Chip, 4.3k , 5%, 0402 VISHAY, CRCW04024K30JNEA
15 8 R24, R26, R28, R30, R35, R37, R39, R41 Res., Chip, 3.6k , 5%, 0402 VISHAY, CRCW04023K60JNEA
16 4 RT1-RT4 Res., Chip, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA
17 2 U2, U3 Quad MOSFETs, FDMQ8203 FAIRCHILD, FDMQ8203
DC1788B-A BOM
1 1 Q1 Trans., FDMC86102, POWER33 FAIRCHILD, FDMC86102
2 1 R10 Res., Chip, 0Ω, 5%, 0603 VISHAY, CRCW06030000Z0EA
3 1 R15 Res., Chip, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA
4 1 R31 Res., Chip, 10k, 1%, 0805 VISHAY, CRCW080510K0FKEA
5 2 RC1, RC6 Res., Chip, 140Ω, 1%, 0805 VISHAY, CRCW0805140RFKEA
6 2 RC2, RC8 Res., Chip, 76.8Ω, 1%, 0805 VISHAY, CRCW080576R8FKEA
7 2 RC3, RC10 Res., Chip, 49.9Ω, 1%, 0805 VISHAY, CRCW080549R9FKEA
8 2 RC4, RC5 Res., Chip, 34.8Ω, 1%, 0805 VISHAY, CRCW080534R8FKEA
9 1 RC7 Res., Chip, 46.4Ω, 1%, 0805 VISHAY, CRCW080546R4FKEA
10 1 RC9 Res., Chip, 64.9Ω, 1%, 0805 VISHAY, CRCW080564R9FKEA
11 1 RC11 Res., Chip, 118Ω, 1%, 0805 VISHAY, CRCW0805118RFKEA
12 1 T1 XFMR, Würth 749022016 WÜRTH, 749022016
13 1 U1 IC, LT4275AIDD, DFN10DD LINEAR TECHNOLOGY, LT4275AIDD
Optional Circuit Components
1 0 C2 Cap., OPT, 0402 OPT
3 0 C5 Cap., OPT, 0603 OPT
4 0 D1 Diode, OPT, SMA OPT
5 0 D12 Diode, OPT, SOD-123 OPT
6 0 E5,E6 TP, OPT OPT
7 0 Q2 Trans., FDN8601, SOT23 FAIRCHILD, FDN8601
8 0 Q7,Q8 Trans., OPT, SOT23 OPT
9 0 R9, R22, R33, R42 Res., 0603, OPT OPT
6 0 R16, R17, R32 Res., 0805, Opt OPT
2 0 RV1-RV4 Varistor, Opt SANKOSHA, SD4-90, OPT

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DEMO MANUAL DC1788B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Hardware for Demo Board Only
1 1 C4 Cap., 22µF, 100V, OS-CON SUN ELECT., 100CE22BS
2 1 CG2 Cap., X7R, 1nF, 2kV, 10%, 1808 TDK, C4520X7R3D102K
3 1 D3 LED, LN1351C-(TR), J-Type-LN1351CTR PANASONIC, LN1351C-(TR)
4 3 E1, E2, E4 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
5 1 E3 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
6 2 J1, J2 Conn., SS-7188S-A-NF STEWART CONNECTOR, SS-7188S-A-NF
7 18 JP1-JP18 HDR, 1x2 2mm, HD1X2-079 SAMTEC, TMM-102-02-L-S
8 1 R11 Res., Chip, 0Ω, 5%, 0603 VISHAY, CRCW06030000Z0EA
9 1 RMPS1 Res., Chip, 5.1k, 5%, 2512 VISHAY,CRCW25125K10JNEA
10 4 RT5-RT8 Res., Chip, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA
11 1 Fab, Printed Circuit Board DEMO CIRCUIT 1788B
DC1788B-B BOM
1 1 C5 Cap., X5R, 0.1µF, 25V, 10%, 0603 TDK, C1608X5R1E105K
2 1 D1 Diode, B1100A, 100V, SMA DIODES INC., B1100A
3 1 D12 Diode, 30V, Zener, SOD-123 CENTRAL SEMI, CMHZ5256B
4 1 E3 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
5 2 E5, E6 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
6 1 Q2 Trans, FDN8601, SOT23 FAIRCHILD, FDN8601
7 2 Q7, Q8 Trans, MMBTA42, 300V, SOT23 FAIRCHILD, MMBTA42
8 1 R9 Res., Chip, 82.5k, 1%, 0603 VISHAY, CRCW060382K5FKEA
9 1 R10 Res., Chip, 20k, 1%, 0603 VISHAY, CRCW060320KFKEA
10 2 R15, R22 Res., Chip, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA
11 1 R16 Res., Chip, 34.8Ω, 1%, 0805 VISHAY, CRCW080534R8FKEA
12 1 R32 Res., Chip, 10k, 5%, 0805 VISHAY, CRCW080510K0JNEA
13 1 R33 Res., Chip, 56k, 5%, 0603 VISHAY, CRCW080556K0JNEA
14 1 R42 Res., Chip, 62k, 5%, 0402 VISHAY, CRCW040262K0JNED
15 1 RMPS1 Res., Chip, 4.7k, 5%, 2512 VISHAY, CRCW25124K70JNEG
16 1 T1 XFMR, Würth 749022017 WÜRTH, 749022017
17 1 U1 IC, LT4275BIDD, DFN10DD LINEAR TECHNOLOGY, LT4275BIDD
Optional Circuit Components
1 0 C2 Cap., OPT, 0402 OPT
2 0 JP1-JP18 HDR, 1x2 2mm, Opt OPT
3 0 Q1 Trans., Opt OPT
4 0 R17, R31 Res., 0805, Opt OPT
5 0 RC1-RC11 Res., 0805, Opt OPT
6 0 RV1-RV4 Varistor, Opt Sankosha, SD4-90, OPT
Hardware for Demo Board Only
1 1 C4 Cap., 22µF, 100V, OS-CON SUN ELECT., 100CE22BS
2 1 CG2 Cap., X7R, 1nF, 2KV, 10% 1808 TDK, C4520X7R3D102K
3 1 D3 LED, LN1351C-(TR), J-Type-LN1351CTR PANASONIC, LN1351C-(TR)
4 3 E1, E2, E4 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
5 1 E3 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
6 2 J1, J2 Conn., SS-7188S-A-NF STEWART CONNECTOR, SS-7188S-A-NF
7 18 JP1-JP18 HDR, 1x2 2mm, HD1X2-079 SAMTEC, TMM-102-02-L-S
parts list

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DEMO MANUAL DC1788B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
8 1 R11 Res., Chip, 0Ω, 5%, 0603 VISHAY, CRCW06030000Z0EA
9 1 RMPS1 Res., Chip, 5.1k, 5%, 2512 VISHAY, CRCW25125K10JNEA
10 4 RT5-RT8 Res., Chip, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA
11 1 Fab, Printed Circuit Board DEMO CIRCUIT 1788B
DC1788B-C BOM
1 1 C5 Cap., X5R, 0.1µF, 25V, 10%, 0603 TDK, C1608X5R1E105K
2 1 D1 Diode, B1100A, 100V, SMA DIODES INC., B1100A
3 1 D12 Diode, 30V Zener, SOD-123 CENTRAL SEMI, CMHZ5256B
4 2 E5,E6 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
5 1 Q2 Trans., FDN8601, SOT23 FAIRCHILD, FDN8601
6 2 Q7,Q8 Trans., MMBTA42, 300V, SOT23 FAIRCHILD, MMBTA42
7 1 R9 Res., Chip, 82.5k, 1%, 0603 VISHAY, CRCW060382K5FKEA
8 1 R10 Res., Chip, 20k, 1%, 0603 VISHAY, CRCW060320KFKEA
9 1 R22 Res., Chip, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA
10 1 R32 Res., Chip, 10k, 5%, 0805 VISHAY, CRCW080510K0JNEA
11 1 R33 Res., Chip, 56k, 5%, 0603 VISHAY, CRCW060356K0JNEA
12 1 R42 Res., Chip, 62k, 5%, 0402 VISHAY, CRCW040262K0JNED
13 1 RC1 Res., Chip, 140Ω, 1%, 0805 VISHAY, CRCW0805140RFKEA
14 1 RC2 Res., Chip, 76.8Ω, 1%, 0805 VISHAY, CRCW080576R8FKEA
15 1 RC3 Res., Chip, 49.9Ω, 1%, 0805 VISHAY, CRCW080549R9FKEA
16 1 RMPS1 Res., Chip, 4.3k, 5%, 2512 VISHAY, CRCW25124K30JNEA
17 1 T1 XFMR, Würth 749023015 WÜRTH, 749023015
18 1 U1 IC, LT4275CIDD, DFN10DD LINEAR TECHNOLOGY, LT4275CIDD
Optional Circuit Components
1 0 C2 Cap., OPT, 0402 OPT
2 0 E3 TP, Turret, 0.094", Opt OPT
3 0 JP2, JP4, JP6, JP8, JP9-JP18 HDR, 1x2 2mm, Opt OPT
4 0 Q1 Trans., Opt OPT
5 0 R15 Res., 0603, Opt OPT
6 0 R16, R17, R31 Res., 0805, Opt OPT
7 0 RC4-RC11 Res., Opt OPT
8 0 RV1-RV4 Varistor, Opt SANKOSHA, SD4-90, OPT
Hardware for Demo Board Only
1 1 C4 Cap., 22µF, 100V, OS-CON SUN ELECT., 100CE22BS
2 1 CG2 Cap., X7R, 1nF, 2KV, 10% 1808 TDK, C4520X7R3D102K
3 1 D3 LED, LN1351C-(TR), J-Type-LN1351CTR PANASONIC, LN1351C-(TR)
4 3 E1, E2, E4 TP, Turret, 0.094" MILL-MAX, 2501-2-00-80-00-00-07-0
5 2 J1, J2 Conn., SS-7188S-A-NF STEWART CONNECTOR, SS-7188S-A-NF
6 4 JP1, JP3, JP5, JP7 HDR, 1x2 2mm SAMTEC, TMM-102-02-L-S
7 1 R11 Res., Chip, 0Ω, 5%, 0603 VISHAY, CRCW06030000Z0EA
8 1 RMPS1 Res., Chip, 5.1k, 5%, 2512 VISHAY, CRCW25125K10JNEA
9 4 RT5-RT8 Res., Chip, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA
10 1 Fab, Printed Circuit Board DEMO CIRCUIT 1788B
parts list

14
dc1788bfa
DEMO MANUAL DC1788B
schematic Diagram
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
37V - 57V
DEMO CIRCUIT 1788B
1. ALL RESISTORS AND CAPACITORS ARE 0603 2. ALL RESISTORS TOLERANCE RATING ARE 5%
NOTE 1: UNLESS OTHERWISE SPECIFIED
37V-57V
IN FROM LTPOE++ PSE
OUT TO PHY
JUMPER SELECTIONS
POE CLASS CLASS ++
CLASS POWER
* SEE OPTION TABLES ON SHEET 2
ASSY
A,C A,C A,C A,C
A A
A
A A
0 1 2 3 4
4 *** 4 *** 4 *** 4 ***
13W
3.84W 6.49W
13W
25.5W
38.7W
52.7W
70W 90W
JP1 JP3 JP5 JP7 JP9
JP11 JP13 JP15 JP17
JP2 JP4 JP6 JP8 JP10
JP12 JP14 JP16 JP18
***
AN LTPOE + + PD WILL BE CLASSIFIED AS CLASS 4
BY AN IEEE 802.3 AT COMPLIANT PSE.
*
**
**
RCLASS JUMPERS
**
**
** **
**
** **
**
**
**
**
**
**
** **
**
RCLASS++
RCLASS
VPORTN
RCLASS
RCLASS++
DATA1 DATA2
SPARE1 SPARE2
VPORTP VPORTN
AUX+
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
1
Wednesday, February 06, 2013
12
LTPOE + + POWERED DEVICE
KAUNG H.
KAUNG H.
N/A
LT4275XIDD
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
1
Wednesday, February 06, 2013
12
LTPOE + + POWERED DEVICE
KAUNG H.
KAUNG H.
N/A
LT4275XIDD
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
1
Wednesday, February 06, 2013
12
LTPOE + + POWERED DEVICE
KAUNG H.
KAUNG H.
N/A
LT4275XIDD REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
KAUNG H.PRODUCTION1 01-07-13
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
KAUNG H.PRODUCTION1 01-07-13
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
KAUNG H.PRODUCTION1 01-07-13
__
CT3
0.01uF
200V 0805
CT3
0.01uF
200V 0805
R11
0
R11
0
RMPS
1W 2512
*
RMPS
1W 2512
*
JP14JP14
JP1JP1
JP18JP18
TP5TP5
CT2
0.01uF
200V 0805
CT2
0.01uF
200V 0805
RC9
**
08051%
RC9
**
08051%
RC10
**
0805 1%
RC10
**
0805 1%
JP8JP8
JP3JP3
CT1
0.01uF
200V 0805
CT1
0.01uF
200V 0805
RC4
**
0805 1%
RC4
**
0805 1%
R14 100K R14 100K
R16* 1%
0805
RCLS R16* 1%
0805
RCLS
RT4 75 RT4 75
C3
47nF
X7R 100V 0805
C3
47nF
X7R 100V 0805
RC6
**
0805 1%
RC6
**
0805 1%
+
C4
22uF
100V
+
C4
22uF
100V
D3 LN1351C-(TR) PANASONIC D3 LN1351C-(TR) PANASONIC
12
JP2JP2
Q1
*
Q1
*
6
4
5 8 71
2 3
TP1TP1
JP15JP15
RT3 75 RT3 75
C1 0.1uF 100V 0805 C1 0.1uF 100V 0805
RC2
**
0805 1%
RC2
**
0805 1%
RT2 75 RT2 75
E2
VOUT-
E2
VOUT-
C2 OPT 0402 C2 OPT 0402
RC11
**
08051%
RC11
**
08051%
RT1 75 RT1 75
CG2
1000pF
2KV 1808
CG2
1000pF
2KV 1808
Q2
*
Q2
*
3
1
2
E5
AUX+
*
E5
AUX+
*
RC5
**
08051%
RC5
**
08051%
RV4 SD4-90 OPT RV4 SD4-90 OPT
JP5JP5
RC1
**
0805 1%
RC1
**
0805 1%
TP3TP3
RT7 75 RT7 75
R15
*
R15
*
RT5 75 RT5 75
J1
SS-7188S-A-NF
J1
SS-7188S-A-NF
1 2 3 4 5 6 7 8
910
R13 3.3K R13 3.3K
U1* U1*
IEEUVLO
1
AUX
2
RCLASS
3
RCLASS++
4
GND
5T2P 6
PWRGD 7
HSSRC 8
HSGATE 9
VPORT 10
GND
11
R10
*
R10
*
JP6JP6
RV3 SD4-90 OPT RV3 SD4-90 OPT
TP4TP4
D1* D1*
2 1
JP17JP17
JP16JP16
R17 OPT 0805 1% RCLS++ R17 OPT 0805 1% RCLS++
JP13JP13
E1
VOUT+
E1
VOUT+
RC7
**
08051%
RC7
**
08051%
E3
T2P
*
E3
T2P
*
RC8
**
0805 1%
RC8
**
0805 1%
JP10JP10
R9 1% R9 1%
RC3
**
0805 1%
RC3
**
0805 1%
RV2 SD4-90 OPT RV2 SD4-90 OPT
JP7JP7
T1
*
T1
*
D- 3
TD 1
X+
14
X-
16
D+ 11
D- 9 D- 6
D+ 8
X-
13
TD 4
D+ 5 D+ 2
TX
15 TD 10
TD 7
D- 12
TX
18
X+
17
X-
19
TX
21
X+
20
X-
22
TX
24
X+
23
E4
PWRGD
E4
PWRGD
JP4JP4
JP9JP9
D2
SMBJ58A
D2
SMBJ58A
2 1
JP11JP11
J2 SS-7188S-A-NF J2 SS-7188S-A-NF
1 2 3 4 5 6 7 8
910
RT8 75 RT8 75
R12 8.2 R12 8.2
TP2TP2
CG1
1000pF
2KV 1808
CG1
1000pF
2KV 1808
RV1 SD4-90 OPT RV1 SD4-90 OPT
CT4
0.01uF
200V 0805
CT4
0.01uF
200V 0805
JP12JP12
RT6 75 RT6 75
E6
AUX-
*
E6
AUX-
*

15
dc1788bfa
DEMO MANUAL DC1788B
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
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
DEMO CIRCUIT 1788B
-A
*
U1
-B -C
LT4275AIDD LT4275BIDD
LT4275CIDD
T1
749022016
D1
OPT
B1100A B1100A
Q1
FDMC86102
OPT
OPT
R9
OPT
82.5K 82.5K
R10
0
20K
E5
OPT
STUFF
E6
OPT
749022017 749023015
ASSY
20K
R22
OPT 100K 100K
R32
OPT
10K 10K
R33
OPT
56K
56K
R31
10K
OPT OPT
R42
OPT
62K
62K
D12
OPT
CMHZ5256B CMHZ5256B
OPT
C5
0.1uF 0.1uF
STUFF
STUFF STUFF
STUFF
E3
OPT
STUFF
R15
100K
OPT
JP1,3,5,7
JP2,4,6,8
JP9-JP18
RMPS1
STUFF STUFF
OPT OPT OPT
OPT OPT
5.1K 4.7K 4.3K
R16
34.8100K
OPTOPT
STUFF STUFF
OPT
140
OPT
140
76.8 76.8
34.8 RC4
OPT
49.9 49.9
OPT
RC1 RC2 RC3
OPT
34.8 RC5 OPT OPT
140 RC6
OPT OPT
46.4
RC7
OPT OPT
76.8 RC8 OPT OPT
64.9
RC9
OPT OPT
49.9
RC10
OPT OPT
118 RC11 OPT OPT
-A
ASSY
-B -C
**
Q2
OPT
FDN8601 FDN8601 MMBTA42
Q7, Q8
OPT
MMBTA42
NOTE 2: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS ARE 0402 2. ALL RESISTORS TOLERANCE RATING ARE 5%
V1
SPARE2DATA1 SPARE1DATA2
V2
DATA1 DATA2 SPARE1 SPARE2
SPARE2 SPARE1 DATA2 DATA1
VPORTP VPORTN
AUX+
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
1
Wednesday, February 06, 2013
22
LTPOE + + POWERED DEVICE
KAUNG H. KAUNG H.
N/A
LT4275XIDD
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
1
Wednesday, February 06, 2013
22
LTPOE + + POWERED DEVICE
KAUNG H. KAUNG H.
N/A
LT4275XIDD
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
1
Wednesday, February 06, 2013
22
LTPOE + + POWERED DEVICE
KAUNG H. KAUNG H.
N/A
LT4275XIDD
R42
*
R42
*
VPORTPVPORTP
R31
*
0805 R31
*
0805
D11 MMBD4148 D11 MMBD4148
13
R29 4.3K R29 4.3K
R24 3.6K R24 3.6K
C5
*
25V
0603
C5
*
25V
0603
R21 100K R21 100K
R45
100K
R45
100K
D15 MMBD4148 D15 MMBD4148
13
R32
*
0805
R32
*
0805
D5
MMSZ5242BS
D5
MMSZ5242BS
2 1
R46
100K
R46
100K
Q3
MMBT3904
Q3
MMBT3904
1
2 3
D8 MMBD4148 D8 MMBD4148
13
N-CH
U3-4
FDMQ8203
N-CH
U3-4
FDMQ8203
G4 12
S4
10
S4
11
D3_4
16
R40 4.3K R40 4.3K
R26 3.6K R26 3.6K
D14 MMBD4148 D14 MMBD4148
13
P-CH
U2-2
FDMQ8203
P-CH
U2-2
FDMQ8203
G2
4S2 5
S2 6
D1_2 14
Q5 MMBT3904 Q5 MMBT3904
1
2 3
P-CH
U2-3
FDMQ8203
P-CH
U2-3
FDMQ8203
G3
9S3 7
S3 8
D3_4 15
D10 MMBD4148 D10 MMBD4148
13
D17
MMSZ5242BS
D17
MMSZ5242BS
2 1
R34
4.3K
R34
4.3K
Q12
MMBT3906
Q12
MMBT3906
1
23
R19 100K R19 100K
R39 3.6K R39 3.6K
R22
*
0603 R22
*
0603
R41
3.6K
R41
3.6K
Q8
*
Q8
*
R37 3.6K R37 3.6K
N-CH
U2-4
FDMQ8203
N-CH
U2-4
FDMQ8203
G4 12
S4
10
S4
11
D3_4
16
Q10
MMBT3906
Q10
MMBT3906
1
23
D16 MMBD4148 D16 MMBD4148
13
R35 3.6K R35 3.6K
D9 MMBD4148 D9 MMBD4148
13
R43 100K R43 100K D19
MMSZ5242BS D19 MMSZ5242BS
2 1
V2V2
R25 4.3K R25 4.3K
R18
100K
R18
100K
P-CH
U3-3
FDMQ8203
P-CH
U3-3
FDMQ8203
G3
9S3 7
S3 8
D3_4 15
Q9 MMBT3906 Q9 MMBT3906
1
23
R38 4.3K R38 4.3K
R20
100K
R20
100K
V1V1
Q11 MMBT3906 Q11 MMBT3906
1
23
N-CH
U2-1
FDMQ8203
N-CH
U2-1
FDMQ8203
G1 1
S1
2
S1
3
D1_2
13
R23 4.3K R23 4.3K
D7
MMSZ5242BS
D7
MMSZ5242BS
2 1
N-CH
U3-1
FDMQ8203
N-CH
U3-1
FDMQ8203
G1 1
S1
2
S1
3
D1_2
13
R30
3.6K
R30
3.6K
Q4 MMBT3904 Q4 MMBT3904
1
2 3
Q6 MMBT3904 Q6 MMBT3904
1
2 3
D4
MMSZ5242BS
D4
MMSZ5242BS
2 1
D18 MMSZ5242BS D18 MMSZ5242BS
2 1
Q7
*
Q7
*
1
2 3
AUXAUX
R44 100K R44 100K
R36 4.3K R36 4.3K
R27 4.3K R27 4.3K
D13 MMBD4148 D13 MMBD4148
13
D12*D12*
2 1
R33
*
0603
R33
*
0603
D6
MMSZ5242BS
D6
MMSZ5242BS
2 1
P-CH
U3-2
FDMQ8203
P-CH
U3-2
FDMQ8203
G2
4S2 5
S2 6
D1_2 14
R28 3.6K R28 3.6K
D20
MMSZ5242BS
D20
MMSZ5242BS
2 1

16
dc1788bfa
DEMO MANUAL DC1788B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2012
LT 0313 REV A • 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 beingsold or provided by Linear Technologyis intendedfor usefor 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:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation