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DEMO MANUAL DC2093A
Description
LT4275/LT4321
LTPoE++/IEEE 802.3at/
IEEE 802.3af Compliant
Powered Device Interface
Demonstration circuit 2093A features the LT
®
4275, a
fourth generation powered device (PD) controller and the
LT4321, an ideal diode bridge controller for Power over
Ethernet (PoE) applications.
The DC2093A is available in DC2093A-A, DC2093A-B, and
DC2093A-C versions to meet the power level required by
the PD application. The DC2093A-A features the LT4275A
PD controller. This controller supports the IEEE 802.3at
(Type 2, PoE+), IEEE 802.3af (Type 1, PoE) and LTPoE++™
specifications. LTPoE++ adds four power levels to the
existing IEEE standard with 38.7W, 52.7W, 70W, and 90W
of delivered PD power at the RJ45 jack. The DC2093A-B
features the LT4275B PD controller and is compliant with
the IEEE 802.3at and IEEE 802.3af specifications. The
DC2093A-C features the LT4275C PD controller and is
compliant with the IEEE 802.3af specification.
All three assemblies of the DC2093A include a PoE ideal
diode bridge controller, LT4321, and eight N-channel FETs
to reduce heat, maximize power efficiency, and increase
delivered power compared to a conventional diode bridge
rectifier. This controller is designed to be used in PoE ap-
plications without corrupting the PD’s signature resistance
during detection and prevent reverse current during a short
at the Ethernet cable.
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.
Many of the main features from the previous generation
PD controller are included in the LT4275 PD controller.
These include a power good indicator, a power sourcing
equipment (PSE) type indicator, and support for an auxil-
iary 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-channel MOSFET to maximize power efficiency, reduce
heat dissipation, and ease thermal design. An LED status
indicator is included to indicate that 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 DC2093A to the DC/DC
converter that is right for the application. Linear Technology
offers a variety of DC/DC converter solutions that can be
used with the DC2093A (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 DC2093A Assemblies
ASSEMBLY PoE STANDARD
MAXIMUM POWER
LEVEL
POWER GOOD
INDICATOR (PWRGD)
PSE TYPE INDICATOR
(T2P)
AUXILIARY SUPPLY
SUPPORT
DC2093A-A LTPoE++
PoE+
PoE
90W Yes Yes No
DC2093A-B PoE+
PoE 25.5W Yes Yes Yes
DC2093A-C PoE 13W Yes No Yes
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DEMO MANUAL DC2093A
Table 2. DC2093A 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 DC2093A-A, VPORT = 48V, ILOAD = 1.1A 99.2% (Typical)
DC2093A-B, VPORT = 48V, ILOAD = 600mA 98.9% (Typical)
DC2093A-C, VPORT = 48V, ILOAD = 350mA 98.5% (Typical)
PoE Type Switching Frequency An LTPoE++ PSE is Powering a DC2093A-A 840Hz
performance summary
theory of operation
When an LTPoE++ PSE is connected to the DC2093A demo
board RJ45 connector, J1, via a CAT5e or CAT6 Ethernet
cable, the PSE initiates the detection process. During this
process, the PoE ideal diode bridge controller is inac-
tive and the body diodes of the PoE ideal diode bridge
MOSFETs form a silicon diode bridge. 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. 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) (DC2093A-A and DC2093A-B only). The PWRGD
indicator signals the load to start drawing current and the
LT4321 to turn on the appropriate PoE ideal diode bridge
MOSFETs with low RDS(ON) in the high current path. This
reduces heat dissipation and increases delivered power
compared to the conventional diode bridge. The T2P in-
dicator 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 DC2093A-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
DC2093A-B includes a preselected RCLS resistor to support
IEEE 802.3at 2-event classification and this board does not
contain jumper blocks. The DC2093A-C includes multiple
jumpers to support all IEEE 802.3af power levels. Table 3
shows each shunt position and its associated class number
and power level for the DC2093A-A and -C boards. Use
Table3 as a selection guide to choose a suitable power
level for the load.
Table 3. DC2093A-A and DC2093A-C Shunt Positions for PoE
Power Levels
ASSEMBLY
PoE
CLASS
POWER LEVEL AT
THE PD INPUT RCLASS JUMPERS
DC2093A-A & -C 0 13W JP1 JP2
DC2093A-A & -C 1 3.84W JP3 JP4
DC2093A-A & -C 2 6.49W JP5 JP6
DC2093A-A & -C 3 13W JP7 JP8
DC2093A-A 4 25.5W JP9 JP10
DC2093A-A 4* 38.7W JP11 JP12
DC2093A-A 4* 52.7W JP13 JP14
DC2093A-A 4* 70W JP15 JP16
DC2093A-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 DC2093A
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
DC2093A 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 DC2093A 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 DC2093A assembly. The T2P signal is
valid after PWRGD is active. This indicator is not connected
on the DC2093A-C.
Table 4. Summary of T2P Signals Supported by the DC2093A
Assemblies
ASSEMBLY PSE TYPE T2P SIGNAL
DC2093A-A LTPoE++ 840Hz, 50% Duty Cycle
IEEE 802.3at (Type 2, PoE+) Logic Low
IEEE 802.3af (Type 1, PoE) Logic High
DC2093A-B LTPoE++ Logic Low
IEEE 802.3at (Type 2, PoE+) Logic Low
IEEE 802.3af (Type 1, PoE) Logic High
DC2093A-C Any PSE Not Supported
theory of operation
Auxiliary Supply Support
The DC2093A-B and DC2093A-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 DC2093A-B board
when an auxiliary supply is present. The auxiliary supply
input is an assembly option on the DC2093A-A board.
DC2093A Companion PSE Demo Boards
Linear Technology offers a variety of PSE solutions to
evaluate with DC2093A. Refer to Table 5 to select a PSE
demo board based on the DC2093A assembly and the
application power requirement.
Table 5. Selection of Companion PSE Demo Board depending
on the DC2093 Assembly and the PoE Power Level
DC2093
ASSEMBLY
PoE POWER
LEVEL
COMPANION PSE DEMO
BOARD
DC2093A-A 90W DC1814A-D
70W DC1814A-C
52.7W DC1814A-B
38.7W DC1814A-A
DC2093A-B 25.5W DC1567A
DC2093A-C 13W DC981A/B
**Contact Linear for multi-port PSE demo board options.
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DEMO MANUAL DC2093A
Dc2093a-a quick start proceDure
NOTE: Handle the DC2093A-A by the edge of the board.
Power over Ethernet Input
1. Refer to Figure 1 to evaluate the DC2093A-A with a DC/
DC converter. If a resistive or an active load is used
to evaluate the DC2093A-A, use the setup diagram as
shown in Figure 2.
2. Default class select shunt positions are at JP1 and JP2
on the DC2093A-A board. In this configuration, any
PSE with enough power will turn on this PD. Choose a
power level from Table3 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 DC2093A-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 DC2093A-A with a DC-DC Converter, a Microprocessor, and an LTPoE++ PSE
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DEMO MANUAL DC2093A
Dc2093a-a quick start proceDure
Figure 2. Setup Diagram for DC2093A-A with a Resistive or an Active Load
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DEMO MANUAL DC2093A
Dc2093a-B quick start proceDure
NOTE: Handle the DC2093A-B by the edge of the board.
Power over Ethernet Input
1. Refer to Figure 3 to evaluate the DC2093A-B with a DC/
DC converter. If a resistive or an active load is used
to evaluate the DC2093A-B, use the setup diagram as
shown in Figure 4.
2. Connect the output of the PSE to the RJ45 connector
(J1) on the DC2093A-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 5 to evaluate the DC2093A-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 3. Setup Diagram for the DC2093A-B with a DC/DC Converter, a Microprocessor, and a Type 2 PSE
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DEMO MANUAL DC2093A
Dc2093a-B quick start proceDure
Figure 4. Setup Diagram for DC2093A-B with a Resistive or an Active Load
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DEMO MANUAL DC2093A
Dc2093a-B quick start proceDure
Figure 5. Setup Diagram for the DC2093A-B with a DC/DC Converter
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DEMO MANUAL DC2093A
NOTE: Handle the DC2093A-C by the edge of the board.
Power over Ethernet Input
1. Refer to Figure 6 to evaluate the DC2093A-C with a
DC/DC converter. If a resistive or an active load is used
to evaluate the DC2093A-C, use the setup diagram as
shown in Figure 7.
2. Connect the output of the PSE to the RJ45 connector
(J1) on the DC2093A-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 8 to evaluate the DC2093A-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 6. Setup Diagram for the DC2093A-C with a DC/DC Converter and a Type 1 PSE
Dc2093a-c quick start proceDure
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DEMO MANUAL DC2093A
Figure 8. Setup Diagram for the DC2093A-C with a DC/DC Converter and an Auxiliary DC Power Supply
Dc2093a-c quick start proceDure
Figure 7. Setup Diagram for DC2093A-C with a Resistive or an Active Load
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DEMO MANUAL DC2093A
quick start proceDure
Figure 9. DC2093A-A Efficiency at Various PoE Load Currents (without LED D3)
Figure 10. Thermal Image. DC2093A-A with 90W Load. Top View
LOAD CURRENT (A)
0
PERCENT EFFICIENCY (%)
99.4
99.2
99.0
98.8
99.3
99.1
98.9
98.7
98.6 21
dc 2093a F09
2.50.5 1.5
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DEMO MANUAL DC2093A
quick start proceDure
Figure 11. Thermal Image. DC2093A-A with 90W Load. Bottom View
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DEMO MANUAL DC2093A
parts list
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
DC2093A General BOM
1 2 C1, C5 CAP, X7S, 0.047µF, 100V, 10%, 0603 TDK, C1608X7S2A473K080AB
2 0 C2 CAP, OPT, 0402 OPT
3 1 C3 CAP, X7R, 47nF, 100V, 10% 0805 AVX, 08051C473KAT2A
4 1 CG1 CAP, X7R, 1nF, 2kV, 10% 1808 TDK, C4520X7R3D102K
5 4 CT1, CT2, CT3, CT4 CAP, X7R 0.01µF 10% 200V 0805 AVX, 08052C103KAZ2A
6 1 D2 DIODE, SMBJ58A, SMA-DIODE DIODE, INC, SMBJ58A-13-F
7 8 Q3 TO Q10 TRANS, PSMN075-100MSE LFPAK33 NXP, PSMN075-100MSE
8 1 R11, R18 RES, CHIP, 0Ω, 5%, 0603 VISHAY, CRCW06030000Z0EA
9 1 R12 RES, CHIP, 8.2Ω, 5%, 0603 VISHAY, CRCW06038R20JNEA
10 1 R13 RES, CHIP, 3.3k, 5%, 0603 VISHAY, CRCW06033K3JNEA
11 0 R17 RES, OPT OPT
12 1 R14 RES, CHIP, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA
13 4 RT1 TO RT4 RES, CHIP, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA
14 0 RV1 TO RV4 VARISTOR, OPT SANKOSHA, SD4-90, OPT
15 1 U2 IC, LT4321IUF, QFN16UF LINEAR TECHNOLOGY, LT4321IUF
16 2 XJP1, XJP2 SHUNT, 0.079'' CENTER SAMTEC, 2SN-BK-G
17 2 STENCILS (TOP & BOTTOM) STENCIL DC2093A
DC2093A-A BOM
1 1 DC2093A DC2093A GENERAL BOM
2 1 Q1 TRANS, PSMN040-100MSE, LFPAK33 NXP, PSMN040-100MSE
3 1 R10 RES, CHIP, 0, 5%, 0603 VISHAY, CRCW06030000Z0EA
4 1 R15 RES, CHIP, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA
5 2 RC1, RC6 RES, CHIP, 140, 1%, 0805 PANASONIC, ERJ-6ENF1400V
6 2 RC2, RC8 RES, CHIP, 76.8, 1%, 0805 PANASONIC, ERJ-6ENF76R8V
7 2 RC3, RC10 RES, CHIP, 49.9, 1%, 0805 VISHAY, CRCW080549R9FKEA
8 2 RC4, RC5 RES, CHIP, 34.8, 1%, 0805 VISHAY, CRCW080534R8FKEA
9 1 RC7 RES, CHIP, 46.4, 1%, 0805 PANASONIC, ERJ-6ENF46R4V
10 1 RC9 RES, CHIP, 64.9, 1%, 0805 VISHAY, CRCW080564R9FKEA
11 1 RC11 RES, CHIP, 118, 1%, 0805 VISHAY, CRCW0805118RFKEA
12 1 T1 XFMR, WÜRTH 749022016 WÜRTH 749022016
13 1 U1 IC, LT4275AIDD DFN10DD/MSOP10MS LINEAR TECHNOLOGY, LT4275AIDD
Optional Circuit Components
1 0 D1 DIODE, OPT, SMA OPT
2 0 E5, E6 TP, OPT OPT
3 0 Q2 TRANS, Si2328DS-T1-GE3, SOT23 VISHAY, Si2328DS-T1-GE3
4 0 R9, R16 RES, OPT OPT
Hardware for Demo Board Only
1 1 C4 CAP, 22µF, 100V, OSCON SUN ELECT, 100CE22BS
2 1 CG2 CAP, X7R, 1nF, 2kV, 10% 1808 TDK, C4520X7R3D102K
3 1 D3 LED, GREEN ROHM, SML-010FTT86L
4 1 D4 DIODE, MMSZ5242BS-7-F, SOD323 DIODES INC, MMSZ5242BS-7-F
5 4 E1, E2, E4, E7 TP, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0
6 1 E3 TP, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0
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DEMO MANUAL DC2093A
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
7 2 J1, J2 CONN, SS-7188S-A-NF STEWART CONNECTOR, SS-7188S-A-NF
8 18 JP1 TO JP18 HDR, 1X2 2MM, HD1X2-079 SULLINS, NRPN021PAEN-RC
9 1 Q11 TRANS, PSMN040-100MSE, LFPAK33 NXP, PSMN040-100MSE
10 1 R19 RES, CHIP, 30k, 5%, 0603 VISHAY, CRCW060330K0JNEA
11 1 RMPS1 RES, CHIP, 5.1k, 5%, 2512 VISHAY, CRCW25125K10JNEA
12 4 RT5 TO RT8 RES, CHIP, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA
13 1 FAB, PRINTED CIRCUIT BOARDS DEMO CIRCUIT 2093A
DC2093A-B BOM
1 1 DC2093A DC2093A GENERAL BOM
2 1 D1 DIODE, B1100A, 100V, SMA DIODE INC B1100A
3 1 E3 TP, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0
4 2 E5, E6 TP, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0
5 1 Q2 TRANS, Si2328DS-T1-GE3, SOT23 VISHAY, Si2328DS-T1-GE3
6 1 R9 RES, CHIP, 82.5k, 1%, 0603 VISHAY, CRCW060382K5FKEA
7 1 R10 RES, CHIP, 20k, 1%, 0603 VISHAY, CRCW060320KFKEA
8 1 R15 RES, CHIP, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA
9 1 R16 RES, CHIP, 34.8Ω, 1%, 0805 VISHAY, CRCW080534R8FKEA
10 1 RMPS1 RES, CHIP, 4.7k, 5%, 2512 VISHAY, CRCW25124K70JNEG
11 1 T1 XFMR, WÜRTH 749022017 WÜRTH 749022017
12 1 U1 IC, LT4275BIDD DFN10DD/MSOP10MS LINEAR TECHNOLOGY, LT4275BIDD
13 1 FAB, PRINTED CIRCUIT BOARDS DEMO CIRCUIT 2093A
Optional Circuit Components
1 0 JP1 TO JP18 HDR, 1X2 2MM, OPT OPT
2 0 Q1 TRANS, OPT OPT
3 0 RC1 TO RC11 RES, OPT OPT
Hardware for Demo Board Only
1 1 C4 CAP, 22µF, 100V, OSCON SUN ELECT, 100CE22BS
2 1 CG2 CAP, X7R, 1nF, 2kV, 10% 1808 TDK, C4520X7R3D102K
3 1 D3 LED, GREEN ROHM, SML-010FTT86L
4 1 D4 DIODE, MMSZ5242BS-7-F, SOD323 DIODES INC, MMSZ5242BS-7-F
5 4 E1, E2, E4, E7 TP, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0
6 1 E3 TP, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0
7 2 J1, J2 CONN, SS-7188S-A-NF STEWART CONNECTOR, SS-7188S-A-NF
8 1 Q11 TRANS, PSMN040-100MSE, LFPAK33 NXP, PSMN040-100MSE
9 1 R19 RES, CHIP, 30k, 5%, 0603 VISHAY, CRCW060330K0JNEA
10 1 RMPS1 RES, CHIP, 4.7k, 5%, 2512 VISHAY, CRCW25124K70JNEG
11 4 RT5 TO RT8 RES, CHIP, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA
12 1 FAB, PRINTED CIRCUIT BOARDS DEMO CIRCUIT 2093A
DC2093A-C BOM
1 1 DC2093A DC2093A GENERAL BOM
2 1 D1 DIODE, B1100A, 100V, SMA DIODE INC. B1100A
3 2 E5, E6 TP, TURRET, 0.094" MILL-MAX 2501-2-00-80-00-00-07-0
4 4 JP1, JP3, JP5, JP7 HDR, 1X2 2MM SAMTEC, TMM-102-02-L-S
5 1 Q2 TRANS, Si2328DS-T1-GE3, SOT23 VISHAY, Si2328DS-T1-GE3
6 1 R9 RES, CHIP, 82.5k, 1%, 0603 VISHAY, CRCW060382K5FKEA
parts list
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DEMO MANUAL DC2093A
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
7 1 R10 RES, CHIP, 20k, 1%, 0603 VISHAY, CRCW060320KFKEA
8 1 RC1 RES, CHIP, 140, 1%, 0805 PANASONIC, ERJ-6ENF1400V
9 1 RC2 RES, CHIP, 76.8, 1%, 0805 PANASONIC, ERJ-6ENF76R8V
10 1 RC3 RES, CHIP, 49.9, 1%, 0805 VISHAY, CRCW080549R9FKEA
11 1 RMPS1 RES, CHIP, 4.3K, 5%, 2512 PANASONIC, ERJ-1TYJ432U
12 1 T1 XFMR, WÜRTH 749023015 WÜRTH 749023015
13 1 U1 IC, LT4275CIDD DFN10DD/MSOP10MS LINEAR TECHNOLOGY, LT4275CIDD
14 1 FAB, PRINTED CIRCUIT BOARDS DEMO CIRCUIT 2093A
Optional Circuit Components
1 0 E3 TP, TURRET, 0.094", OPT OPT
2 0 JP2, JP4, JP6, JP8, JP9 TO JP18 HDR, 1X2 2MM, OPT OPT
3 0 Q1 TRANS, OPT OPT
4 0 R15 RES, OPT OPT
5 0 R16 RES, OPT OPT
6 0 RC4 TO RC11 RES, OPT OPT
Hardware for Demo Board Only
1 1 C4 CAP, 22µF, 100V, OSCON SUN ELECT, 100CE22BS
2 1 CG2 CAP, X7R, 1nF, 2kV, 10% 1808 TDK, C4520X7R3D102K
3 1 D3 LED, GREEN ROHM, SML-010FTT86L
4 1 D4 DIODE, MMSZ5242BS-7-F, SOD323 DIODES INC, MMSZ5242BS-7-F
5 4 E1, E2, E4, E7 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 4 JP1, JP3, JP5, JP7 HDR, 1X2 2MM SULLINS, NRPN021PAEN-RC
8 1 Q11 TRANS, PSMN040-100MSE, LFPAK33 NXP, PSMN040-100MSE
9 1 R19 RES, CHIP, 30k, 5%, 0603 VISHAY, CRCW060330K0JNEA
10 1 RMPS1 RES, CHIP, 4.3k, 5%, 2512 PANASONIC, ERJ-1TYJ432U
11 4 RT5 TO RT8 RES, CHIP, 75Ω, 5%, 0603 VISHAY, CRCW060375R0JNEA
12 1 FAB, PRINTED CIRCUIT BOARDS DEMO CIRCUIT 2093A
parts list
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DEMO MANUAL DC2093A
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
37V - 57V
DEMO CIRCUIT 2093A
1. ALL RESISTORS AND CAPACITORS ARE 0603
2. ALL RESISTORS TOLERANCE RATING ARE 5%
NOTE 1: UNLESS OTHERWISE SPECIFIED
37V-57V
IN FROM 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
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
USE VOUT+ AND VOUT- TERMINALS
TO CONNECT TO A PWRGD ENABLED
POWER SUPPLY ONLY.
USE VOUT+ AND LAB_TEST_VOUT-
TERMINALS FOR LAB TESTING
WITH ELECTRONIC OR RESISTIVE
LOAD ONLY. NOT NEEDED FOR
FINAL CIRCUIT.
RCLASS++
RCLASS
PWRGD
VPORTN
RCLASS
RCLASS++
PWRGD
DATA1
DATA2
SPARE1
SPARE2
VPORTP
VPORTN
PWRGD
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
2
Wednesday, August 14, 2013
12
LTPOE + + POWERED DEVICE
KAUNG H.
KAUNG H.
N/A
LT4275XIDD, LT4321IUF
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
2
Wednesday, August 14, 2013
12
LTPOE + + POWERED DEVICE
KAUNG H.
KAUNG H.
N/A
LT4275XIDD, LT4321IUF
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
2
Wednesday, August 14, 2013
12
LTPOE + + POWERED DEVICE
KAUNG H.
KAUNG H.
N/A
LT4275XIDD, LT4321IUF
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
KAUNG H.PRODUCTION2 06-26-13
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
KAUNG H.PRODUCTION2 06-26-13
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
KAUNG H.PRODUCTION2 06-26-13
__
CT3
0.01uF
200V
0805S
CT3
0.01uF
200V
0805S
R11
0
R11
0
RMPS
1W
2512
*
RMPS
1W
2512
*
JP14JP14
JP1JP1
JP18JP18
TP5TP5
CT2
0.01uF
200V
0805S
CT2
0.01uF
200V
0805S
RC9
**
08051%
RC9
**
08051%
RC10
**
0805 1%
RC10
**
0805 1%
JP8JP8
JP3JP3
CT1
0.01uF
200V
0805S
CT1
0.01uF
200V
0805S
RC4
**
0805 1%
RC4
**
0805 1%
R14
100K
R14
100K
R16*
1%
0805S
RCLS
R16*
1%
0805S
RCLS
RT4
75
RT4
75
C3
47nF
X7R
100V
0805S
C3
47nF
X7R
100V
0805S
RC6
**
0805 1%
RC6
**
0805 1%
+
C4
22uF
100V
+
C4
22uF
100V
D3
LED
D3
LED
12
Q11
PSMN040-100MSE
Q11
PSMN040-100MSE
6
4
5
8
7
1
2
3
JP2JP2
Q1
*
Q1
*
6
4
5
8
71
2
3
E7
LAB_TEST_VOUT-
E7
LAB_TEST_VOUT-
TP1TP1
JP15JP15
RT3
75
RT3
75
C1
0.047uF
100V
0603
C1
0.047uF
100V
0603
RC2
**
0805 1%
RC2
**
0805 1%
RT2
75
RT2
75
E2
VOUT-
E2
VOUT-
C2
OPT
0402S
C2
OPT
0402S
RC11
**
08051%
RC11
**
08051%
R19
30K
R19
30K
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
0805S
1%
RCLS++
R17
OPT
0805S
1%
RCLS++
JP13JP13
E1
VOUT+
E1
VOUT+
RC7
**
08051%
RC7
**
08051%
E3
T2P
*
E3
T2P
*
RC8
**
0805 1%
RC8
**
0805 1%
JP10JP10
RC3
**
0805 1%
RC3
**
0805 1%
R9
1%
R9
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
D2
SMBJ58A
D2
SMBJ58A
2 1
JP9JP9
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
D4
MMSZ5242BS, 12V
D4
MMSZ5242BS, 12V
2 1
TP2TP2
CG1
1000pF
2KV
1808
CG1
1000pF
2KV
1808
RV1
SD4-90
OPT
RV1
SD4-90
OPT
CT4
0.01uF
200V
0805S
CT4
0.01uF
200V
0805S
JP12JP12
RT6
75
RT6
75
E6
AUX-
*
E6
AUX-
*
17
dc2093af
DEMO MANUAL DC2093A
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 2093A
-A
*
U1
-B
-C
LT4275AIDD
LT4275BIDD
LT4275CIDD
T1
749022016
D1
OPT
B1100A
B1100A
Q1
PSMN040-100MSE
OPT
OPT
R9
OPT
82.5K
82.5K
R10
0
20K
E5
OPT
STUFF
E6
OPT
749022017
749023015
ASSY
20K
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
Si2328DS-T1-GE3
Si2328DS-T1-GE3
NOTE 2: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS AND CAPACITORS ARE 0603
2. ALL RESISTORS TOLERANCE RATING ARE 5%
TG36
DATA2
SPARE1
TG45
TG12
BG12
TG36
BG36
TG45
BG45
TG78
BG78
VPORTP
VPORTN
TG78
SPARE2
BG78
BG45
TG12
DATA1
BG12
BG36
SPARE2SPARE1DATA2DATA1
VPORTP
VPORTN
PWRGD
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
2
Monday, August 19, 2013
22
LTPOE + + POWERED DEVICE
KAUNG H.
KAUNG H.
N/A
LT4275XIDD, LT4321IUF
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
2
Monday, August 19, 2013
22
LTPOE + + POWERED DEVICE
KAUNG H.
KAUNG H.
N/A
LT4275XIDD, LT4321IUF
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
2
Monday, August 19, 2013
22
LTPOE + + POWERED DEVICE
KAUNG H.
KAUNG H.
N/A
LT4275XIDD, LT4321IUF
VPORTPVPORTP
Q8
PSMN075-100MSE
Q8
PSMN075-100MSE
6
4
5
8
7
1
2
3
Q9
PSMN075-100MSE
Q9
PSMN075-100MSE
6
4
5
8
7
1
2
3
C5
0.047uF
100V
C5
0.047uF
100V
Q4
PSMN075-100MSE
Q4
PSMN075-100MSE
6
4
5
8
7
1
2
3
Q3
PSMN075-100MSE
Q3
PSMN075-100MSE
6
4
5
8
7
1
2
3
EP
U2
LT4321IUF
EP
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
17
OUTN
Q7
PSMN075-100MSE
Q7
PSMN075-100MSE
6
4
5
8
7
1
2
3
Q6
PSMN075-100MSE
Q6
PSMN075-100MSE
6
4
5
8
7
1
2
3
R18
0
R18
0
Q5
PSMN075-100MSE
Q5
PSMN075-100MSE
6
4
5
8
7
1
2
3
Q10
PSMN075-100MSE
Q10
PSMN075-100MSE
6
4
5
8
7
1
2
3
18
dc2093af
DEMO MANUAL DC2093A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2013
LT 0913 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) 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 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
