Linear Technology 1814A Quick setup guide

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dc1814afe
DEMO MANUAL
DC1814A
Description
LTC4274A
Single LTPoE++ PSE Controller
Demonstration circuit 1814A features the LTC
®
4274A,
single port power sourcing equipment (PSE) controller,
capable of delivering up to 90W of LTPoE++
®
power to a
compatible LTPoE++ powered device (PD). A proprietary
detection/classification scheme allows mutual identifica-
tion between an LTPoE++ PSE and LTPoE++ PD while
remaining compatible and interoperable with existing
Type 1 (13W) and Type2 (25.5W) PDs. The LTC4274A
feature set is a superset of the popular LTC4274. 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.
The LTC4274A is available in multiple power grades,
allowing delivered PD power of 13W, 25.5W, 38.7W,
52.7W, 70W and 90W. The DC1814A has four variations
DC1814A-A, DC1814A-B, DC1814A-C, and DC1814A-D
which accommodate the LTPoE++ power levels (Table 1).
L, LT, LTC, LTM, LTPoE++, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
The LTC4274A is configured in the DC1814A as an AUTO
pinhigh,MIDpinhigh,autonomousmidspanpowerinjec-
tor;inputdata from anexistingnetworksystem is sentout,
along with power
, to a PD. The LTC4274A autonomously
detects a PD, turns power on to the port, and disconnects
port power without the need for a microcontroller. A single
55V supply is required to power the DC1814A. A simple
LDO regulator circuit on the board powers the digital sup-
ply of the LTC4274A. A SHDN pushbutton shuts down the
port and disables detection. A RESET pushbutton resets
the LTC4274A to the AUTO pin high state.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1814A
Table 1. DC1814A Power Levels
DEMO BOARD PSE CONTROLLER MAXIMUM DELIVERED PD POWER POWER SUPPLY*
DC1814A-A LTC4274A-1 38.7W 72W
DC1814A-B LTC4274A-2 52.7W 72W
DC1814A-C LTC4274A-3 70W 120W
DC1814A-D LTC4274A-4 90W 140W
*Recommended DC1814A power supply minimum to avoid drooping in a worst-case scenario with ILIM current at the port. Set the voltage between
54.75V to 57V for LTPoE++ compliance.
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dc1814afe
DEMO MANUAL
DC1814A
Quick start proceDure
Figure 1. DC1814A Setup
Demonstration circuit 1814A is easy to set up for evaluat-
ing the performance of the LT C4274A. Refer to Figure 1
for proper test equipment setup and follow the procedure
below.
1. Connect a 55V to 57V power supply across AGND (+)
and VEE (–). Size the power supply considering the
maximum power delivered to the PD.
2. Connectan802.3Type1orType2,orLTPoE++compat-
ible PD to RJ45 connector J1 with an Ethernet cable.
3. Measure the port output voltage to the PD across
VPORT+ and VPORT– test points.
4. (Optional) Connect a PHY to RJ45 connector J2 with
an Ethernet cable for data tests.
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dc1814afe
DEMO MANUAL
DC1814A
BoarD Layout
Proper components placement and board layout with
respect to the LTC4274A is important to provide electrical
robustnessandcorrectoperation.Thefollowingmentioned
components,also showninFigure2,mustbeclosetotheir
respective LTC4274A pins with no other components in
between on the connection path. Place a 0.1µF capacitor
(C1) directly across the LTC4274A VDD and DGND pins.
Place a 1µF, 100V capacitor (C4) and a SMAJ58A TVS (D3)
directly across the LTC4274A AGND and VEE pins. Place
a 0.22µF, 100V capacitor (C5) directly to the OUT pin and
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
readings.Thesenseresistorusedwith theLTC4274Amust
be 0.25Ω, 1% or better, and with a power rating that can
handle the maximum DC current passed through it. A
dedicatedsensetracefromtheSENSEpinoftheLT C4274A
must go directly to the sense resistor solder pad. Avoid
connecting to copper cutouts and other traces. The VEE
side of the sense resistor must also connect to the VEE
pins of the LTC4274A either through a direct trace (Figure
3A), or a VEE copper plane (Figure 3B), without any other
components in between on this connection.
Figure 2. LTC4274A Key Application Components for Board Placement
Figure 3. LTC4274IUHF VEE and SENSE Kelvin Connection to Sense Resistor
U1
LTC4274AIUHF
AGND SENSE GATE OUT VEE VEE VEE VEE VEE VEE
VDDVDD
VEE
DGND
C1
0.1µF
DGND
DGND
DGND
DGND
13
10
15
16
17
C4
0.1µF
100V
OUT
DC1814A F02
C5
0.22µF
100V
Q1
FDMC86102
RS1
0.25Ω
CSRN2512FKR250
D3
SMAJ58A
18 2219 25 26 27 39 30 31 32
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dc1814afe
DEMO MANUAL
DC1814A
Figure 4. DC1814A LDO Circuit for the LTC4274A Digital Supply
U1
LTC4274AIUHF
AGND VEE VEE VEE VEE VEE VEE
VDD
VEE
C1
0.1µF
D23
5.6V
R5
100k
Q2
CMPTA92
DGND
R10
1Ω
DGND
DGND
DGND
DGND
13
10
15
16
17
DC1814A F04
18 2219 25 26 27 39
D1
3.8V
MMSZ4686T1
R11
1k
1/4W
suppLy VoLtages
Select a VEE supply with enough power to sustain the port
at maximum load. Table 1 shows the maximum delivered
PD power as well as a recommended VEE power supply
minimum to avoid drooping in a worst case scenario with
ILIM current.
The LTC4274A also requires a digital 3.3V supply. The
DC1814A uses a simple LDO regulator circuit to power the
3.3VdigitalsupplyfromtheVEEsupply.TheLTC4274AVDD
supplyis allowedtobe within5Vabove orbelowAGND. On
theDC1814A, VDD is tied toAGND and DGND is anegative
voltage below AGND. D1, R5, Q2, and R11 generate the
negative voltage referenced to AGND (Figure4). These
components are sized to handle the power required to
supply the LTC4274A and LEDs on the DC1814A. Contact
Linear Technology Applications for 3.3V options.
Surge Protection
Ethernet ports can be subject to significant cable surge
events.To keepPoEvoltagesbelowa safelevelandprotect
the application against damage, protection components
are required at the main supply, at the LT C4274A supply
pins and at the port. Refer to Figure 5.
Bulk transient voltage suppression devices and bulk
capacitance are required across the main PoE supply
and should be sized to accommodate system level surge
requirements. Across the LTC4274A AGND pin and VEE
pin are an SMAJ58A, 58V TVS and a 1μF, 100V bypass
capacitor. These components must be placed close to the
LTC4274A pins.
Inahighsurgeenvironment,a 10Ω,0805resistorinseries
from supply AGND to the LTC4274A AGND and VDD pin is
recommended. The bulk TVS and capacitance remain on
the supply side of this 10Ω resistor. The LT C4274A supply
pins local TVS and capacitance remain at the LTC4274A
side of this 10Ω resistor.
The port requires a pair of S1B clamp diodes:one from
OUT to supply AGND and one from supply VEE to OUT. The
diodes at the ports steer harmful surges into the supply
rails where they are absorbed by the surge suppressors
and the VEE bypass capacitance. The layout of these paths
must be low impedance.
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dc1814afe
DEMO MANUAL
DC1814A
U1
LTC4274AIUHF
AGND SENSE GATE OUT VEE VEE VEE VEE VEE VEE
VDD
VEE
C1
0.1µF
D23
5.6V
Q2
CMPTA92
R5
100k
R10
1Ω
10Ω
0805
DGND
DGND
DGND
DGND
13
10
15
16
17
CBULK
VEE
TVSBULK
C4
1µF
100V
OUT
VEE
DC1814A F05
C5
0.22µF
100V
Q1
FDMC86102
RS1
0.25Ω
CSRN2512FKR250
D3
SMAJ58A
18 2219 25 26 27 39 30 31 32
D4
S1B
D5
S1B
D1
3.9V
MMSZ4686T1
R11
1k
1/4W
Figure 5. High Surge Environment Recommended LTC4274A Protection
suppLy VoLtages
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dc1814afe
DEMO MANUAL
DC1814A
pcB Layout
Layer 1. Top LayerTop Silkscreen
Layer 2. –VIN 1 Layer 3. –VIN 2
Layer 4. Bottom Layer Bottom Silkscreen
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dc1814afe
DEMO MANUAL
DC1814A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
1 1 C1 CAP, 0603 0.1µF 10% 25V X7R TDK C1608X7R1E104K (BAL. FR#1807)
2 1 C2 CAP, 4.7µF 20% 63V ALUM. PANASONIC, EEEFK1J4R7R
3 1 C5 CAP, 1206 0.22µF 20% 100V X7R AVX 12061C224MAT
4 1 C4 CAP, 1210 1.0µF 10% 100V X7R AVX, 12101C105KAT
5 2 C3, C6 CAP, 1808 1000pF 10% 2KV X7R TDK C4520X7R3D102K
6 4 CT1-CT4 CAP, 0805 0.01µF 5% 100V X7R AVX 08051C103JAT
7 2 D4, D5 DIODE, RECTIFIER, 100V 1A, SMA VISHAY S1B
8 1 D3 DIODE, TVS 58V 400W SMA DIODES INC., SMAJ58A-13-F
9 1 D2 DIODE, TVS, 64V 600W SMB DIODES INC., SMBJ64A-13-F
10 1 D1 DIODE, ZENER 3.9V SOD-123 ON SEMI MMSZ4686T1G
11 1 D23 DIODE, ZENER 5.6V 5% SOT23 FAIRCHILD, BZX84C5V6
12 4 E1-E4 TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0
13 4 F7-F10 FUSE, 3A, 63VDC 1206 BEL FUSE C1Q 3
14 2 J3, J4 CONN, JACK, BANANA KEYSTONE 575-4
15 2 J1, J2 CONN, RJ45, SINGLE PORT STEWART CONN., SS-7188S-A-NF
16 1 R10 RES, 0603 1.0Ω 5% 1/10W VISHAY CRCW06031R00JNEA
17 4 R6-R9 RES, 0603 10k 5% 1/10W YAGEO, RC0603JR-0710KL
18 1 R5 RES, 0603 100k 5% 1/10W YAGEO, RC0603JR-07100KL
19 8 R1-R4, RT1-RT4 RES, 0603 75Ω 5% 1/10W YAGEO, RC0603JR-0775RL
20 1 R11 RES, THICK FILM 0805 1.0k 5% 1/4W PANASONIC, ERJ-P06J102V
21 1 RS1 RES, 2512 0.25Ω 1% 2W STACKPOLE, CSRN2512FKR250
22 4 MH1-MH4 STAND-OFF, NYLON 0.75" KEYSTONE, 8834(SNAP ON)
23 2 SW1, SW2 SWITCH, MOMENTARY PUSHBUTTON WÜRTH, 434 123 050 816
24 1 Q1 XSTR, MOSFET, N-CHANNEL 100V 2.3A POWER-33 FAIRCHILD FDMC86102
25 1 Q2 XSTR, PNP, 300V 500MA SOT23 CMPTA92 CENTRAL SEMI CMPTA92
26 1 T1 XFMR, POE+ 1.5A
(Option) WÜRTH ELECTRONICS, 749022016
COILCRAFT ETH1-460L
DC1814A-A
1 1 DC1814A GENERAL BOM
2 4 FB1-FB4 FERRITE BEAD, 1k, 0805 TDK MPZ2012S102A
3 1 U1 IC, LTC4274A-1, SINGLE PORT 38.7W PSE CONTROLLER LINEAR LTC4274AIUHF-1
4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1814A
DC1814A-B
1 1 DC1814A GENERAL BOM
2 4 FB1-FB4 FERRITE BEAD, 1k, 0805 TDK MPZ2012S102A
3 1 U1 IC, LTC4274A-2, SINGLE PORT 52.7W PSE CONTROLLER LINEAR LTC4274AIUHF-2
4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1814A
DC1814A-C
1 1 DC1814A GENERAL BOM
2 4 FB1-FB4 FERRITE BEAD, 1k, 0805 TDK MPZ2012S102A
3 1 U1 IC, LTC4274A-3, SINGLE PORT 70W PSE CONTROLLER LINEAR LTC4274AIUHF-3
4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1814A
DC1814A-D
1 1 DC1814A GENERAL BOM
24 FB1-FB4 FERRITE BEAD, 1300Ω, 1812 TAIYO YUDEN FBMH4532HM132-T
3 1 U1 IC, LTC4274A-4, SINGLE PORT 90W PSE CONTROLLER LINEAR LTC4274AIUHF-4
4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1814A
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dc1814afe
DEMO MANUAL
DC1814A
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
DATA AND POWER OUT
VEE
AGND
MAIN PS INPUTS
(+)
(-)
(55V TO 57V)
DATA IN
CSRN2512FKR250
RESET
SHDN
MMSZ4686T1
1/4W
1
VDD
DGND
TP2
TP1
SDA
SCL
ASSEMBLY VERSION -WATT PSE U1
-A 38.7W LTC4274AIUHF-1 -B 52.7W LTC4274AIUHF-2 -C 70W LTC4274AIUHF-3 -D 90W LTC4274AIUHF-4
MPZ2012S102A MPZ2012S102A
FBMH4532HM132-T
NOTE: FOR TEMPERATURE SENSITIVE 90W APPLICATIONS, TWO OF THE 749012013 MAY BE USED AS AN ALTERNATE TO T1 WHICH HAS A HIGHER CURRENT RATING
VPORT +
VPORT -
PRODUCTION DILIAN R. 4/29/11
_
2. INSTALL SHUNTS AS SHOWN. 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. NOTE: UNLESS OTHERWISE SPECIFIED
TM
MPZ2012S102A
FB1, FB2, FB3, FB4
SEE TABLE
SEE TABLE
1a
_POWER LEVEL UPDATE DILIAN R. 9/26/11
T1: WURTH 749022016 COILCRAFT ETH1-460L
1b
_T1 OPTION DILIAN R. 3/28/13
FOR HIGH SURGE ENVIRONMENTS
ADD A 10 OHM, 0805 RESISTOR
AT THIS LOCATION
1c SURGE RESISTOR DILIAN R. 12/8/15
VEE
VEE
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
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
Tuesday, December 08, 2015
11
SINGLE PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
N/A
LTC4274AIUHF FAMILY DEMO CIRCUIT 1814A
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
Tuesday, December 08, 2015
11
SINGLE PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
N/A
LTC4274AIUHF FAMILY DEMO CIRCUIT 1814A
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
Tuesday, December 08, 2015
11
SINGLE PORT LTPoE++ PSE CONTROLLER
JK
DILIAN R.
N/A
LTC4274AIUHF FAMILY DEMO CIRCUIT 1814A
FB3
R6 10K
E2
RT4
75
J2 SS-7188S-A-NF
1 2 3 4 5 6 7 8
9
10
CT2 0.01uF
100V
0805
R2 75
E3
C5
0.22uF 100V
D23
5.6V
1 3
D1
3.9V
C3
1000pF
2kV
U1 LTC4274AIUHF
SDAOUT 1
SDAIN 3
SCL 38
AD0 7
AD1 6
AD2 5
AD3 4
AGND
18
VEE
19
VEE
22
VEE
25
VEE
26
VEE
27
VEE
39
SENSE
30
GATE
31
OUT
32
INT 37
SHDN 14
DGND
17 DGND 16 DGND 15 DGND 10
VDD
13
AUTO
33
MID
36
RESET 35
MSD 34
NC 2 NC 11 NC 12 NC 20 NC 21 NC 23 NC 24 NC 28 NC 29
DNC 8
NC 9
R5 100K
F8
3A, 1206
C1Q 3
J4
J3
RT1
75
SMAJ58A
D3
C4
1.0uF
100V
F10 3A, 1206 C1Q 3
RS1 0.25
D5 S1B
FB2
R7
10K
E4
R11 1.0K
CT3 0.01uF
100V
0805
R10
1
F7 3A, 1206 C1Q 3
CT1 0.01uF
100V
0805
SMBJ64A
D2
F9
3A, 1206
C1Q 3
R4 75
RT3
75
R9 10K
C6
1000pF
2kV
T1
2
223 24 23
1 5 4 6 8 7 9
11 10 12
20 21 19 17 18 16 14 15 13
Q2 CMPTA92
FB1
D4
S1B
E1
R8
10K
Q1
FDMC86102
C1
0.1uF
+
C2
4.7uF
63V
J1 SS-7188S-A-NF
1 2 3 4 5 6 7 8
9 10
SW1
1 2
SW2
1 2
CT4 0.01uF
100V
0805
R1 75 R3 75
RT2
75
FB4
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dc1814afe
DEMO MANUAL
DC1814A
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.
assemBLy Drawing
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DEMO MANUAL
DC1814A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2011
LT 0116 REV E • 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)kitbeing sold orprovidedby Linear Technologyis intended for useforENGINEERING 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
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