Linear Technology LT8705 Quick setup guide

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DEMO MANUAL DC1924A
DESCRIPTION
LT8705
80V VIN and VOUT Synchronous
4-Switch Buck-Boost DC/DC
Controller
Demonstration circuit 1924A is a high performance buck-
boost converter featuring the LT
®
8705 that can operate
from input voltages above, below or equal to the output
voltage. The demo board input range is 36V to 80V. The
output is optimized for 48V at 5A, with the output current
limit set at 7A. (The circuit will operate with lower input
voltage than 36V if load current is reduced).
The controller has integrated input current, input voltage,
output current and output voltage regulators. The one
regulator that wants to decrease current gets control over
thecompensationpinVC.Theinductorcurrentiscontrolled
by the VC signal that is fed into a current comparator
together with a ramp compensation signal.
While the current mode control limits the inductor current
both in normal and in reverse direction, these current
limits have some variation as input voltage changes. The
input and output current regulators offer more accurate
current limits.
The input voltage regulator is typically used in applica-
tions with solar panels or other high impedance power
sources, and will reduce the current if the input voltage
drops below the set point.
The operating mode of the controller is determined
through the MODE pin (jumper JP1) and can be set to
discontinuous mode, forced continuous mode and Burst
Mode
®
operation.
The LT8705 is capable of bidirectional operation when
operating in forced continuous mode. Additional circuitry
may be needed depending on the application.
L, LT, LTC, LTM, Linear Technology Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
The CLKOUT output and the SYNC input can be used
to synchronize two DC1924A circuits with 180 degree
phase shift.
By feeding the LT8705 from a separate low voltage sup-
ply, the power dissipation can be reduced. To supply the
LT8705 chip from an external voltage supply (> 6.4V), cut
thetraceasmarkedontheboardtodisconnecttheEXTVCC
pin from VOUT. The LT8705 will start when voltage is ap-
plied at the input (VIN pin), and when it is running it will
draw current from the EXTVCC pin if the voltage is > 6.4V.
Typical efficiency with 5A load is above 97% across a 36V
to 72V input range using the supplied inductor. Lower
core loss can be achieved by using a ferrite core inductor.
The LT8705 data sheet gives a complete description of
the part, operation and application information. The data
sheet should be read in conjunction with this quick start
guide for demo circuit 1924A. The input voltage range of
the LT8705 itself is 2.8V(need EXTVCC > 6.4V) to 80V
and the output range is 1.3V to 80V.
The LT8705EUHF is assembled in a 38-Lead (5mm ×
7mm) plastic QFN package with a thermal pad underneath
the chip. Proper board layout is essential for maximum
thermal and electrical performance. See the data sheet
section Circuit Board Layout Checklist.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1924A
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DEMO MANUAL DC1924A
Figure 1a. Efficiency and Power Loss as Function of Input
Voltage at 5A Load. Dotted Lines Show Increased Efficiency
When the Inductor Is Replaced by a Ferrite Core Inductor
(Coiltronics SER2918H-223KL)
Figure 1b. Efficiency and Power Loss in CCM Buck Mode.
VIN = 56V. Dotted Lines Show Increased Efficiency When
the Inductor Is Replaced by a Ferrite Core Inductor
(Coiltronics SER2918H-223KL)
VIN (V)
30 36 42 48 54 60 66 72
EFFICIENCY (%)
100
99
97
95
98
96
94
93
92
91
90
89
88
DISSIPATION (W)
12
11
9
7
10
8
6
5
4
3
2
1
0
DC1924a F01a
78
EFFICIENCY
EFFICIENCY FERRITE
DISSIPATION
DISSIPATION FERRITE
EFFICIENCY
EFFICIENCY FERRITE
POWER LOSS
POWER LOSS FERRITE
LOAD CURRENT (A)
0.01
EFFICIENCY (%)
100
90
70
50
80
60
40
95
75
55
85
65
45
POWER LOSS (W)
6
5
3
1
4
2
0
0.1
DC1924a F01b
101
PERFORMANCE SUMMARY
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Input Supply Range Note: Output Power Is Limited When VIN < 30V 36 48 80 V
VOUT Output Voltage 48 V
IIN Maximum Load Current 5 A
IOUT Output Current Limit 7 A
fSW Switching Frequency 200 kHz
EFF Efficiency at DC Input VIN = 36V, VOUT = 48V, IOUT = 5A
VIN = 48V, VOUT = 48V, IOUT = 5A
VIN = 72V, VOUT = 48V, IOUT = 5A
97.5
97.2
97.5
%
%
%
Specifications are at TA= 25°C
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DEMO MANUAL DC1924A
1. Demonstration circuit 1924A is easy to set up to evalu-
ate the performance of the LT8705. Refer to Figure 2
for proper measurement equipment setup and follow
the procedure below.
2. With power off, connect the input power supply to VIN
(TP1) and GND (TP3).
3. Connect the SHDN terminal to ground with a clip-on
lead to disable the board.
4. Apply 48V to the input. The power source must have
greater than 12A capability if you want to evaluate the
board with full load over the input range.
5. Removetheclip-onleadfromSHDNtoenabletheboard.
6. Note that the demo circuit will be enabled at VIN > 5.6V,
when VIN is rising. If operation at very low input volt-
age is not wanted, increase the value of R11 to set the
undervoltage shutdown at the wanted level.
7. Oncetheproperoutputvoltageisestablished,adjustthe
load and the input voltage within the operating range
andobservetheoutputvoltageregulation,ripplevoltage
and efficiency and other parameters as needed. When
measuring input/output voltages, measure at the input/
output terminals of the board to avoid measurement
error caused by voltage drops in cables.
8. To measure input/output voltage ripple, avoid a long
ground lead on the oscilloscope probe, as it may pick
up switching noise. A commonly accepted method is to
removetheoscilloscopeprobeendcapandgroundlead
and set the 20MHz bandwidth limit on the oscilloscope.
Measurethe input/outputvoltageripple bytouchingthe
probe tip directly to the positive terminal of the input or
output capacitor. Connect the probe ground terminal to
the board’s GND plane near the capacitor with a very
short wire.
QUICK START PROCEDURE
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DEMO MANUAL DC1924A
QUICK START PROCEDURE
Figure 2. Test Setup
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DEMO MANUAL DC1924A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C13, C47 CAP CERM 0.22µF 10% 16V X5R 0603 TAIYO YUDEN EMK107BJ224KA-T
2 2 C14, C15 CAP CER 1000pF 16V 20% X7R 0603 AVX CORPORATION 0603YC102MAT4A
3 8 C41-C44, C48, C49-C51 CAP CER 4.7µF 100V X7S 1812 TDK C4532X7S2A475M
4 2 C46, C65 CAP CER 1.0µF 100V X7S 0805 TDK C2012X7S2A105K
5 4 C45, C52, C55, C64 CAP ALUM 220µF 100V 20% RADIAL UCC EKY-101ELL221MK25S
6 3 C56, C57, C58 CAP CER 4.7µF 16V 10% X5R 0603 TAIYO YUDEN, EMK107ABJ475KA-T
7 1 C59 CAP CER 1µF 16V 10% X7R 0603 TDK C1608X7R1C105K
8 1 C61 CAP CER 100nF 16V 10% X7R 0603 TDK C1608X7R1C104K
9 1 C62 CAP CER 220pF 25V 5% NP0 0603 NIC NMC0603NPO221J50TRPF
10 1 C63 CAP CER 3300pF 25V 5% NP0 0603 KEMET C0603C332J3GAC
11 2 D1, D2 RECTIFIERS ULTRA FAST RECTIFIER SINGLE CENTRAL SEMI CMMR1U-02 TR
12 4 D3, D4, D5, D6 LED SMARTLED GREEN 570NM 0603 LG L29K-G2J1-24-Z
13 1 L1 INDUCTOR POWER 22µH 11.0A SMD WÜRTH ELECTRONICS 74435572200
14 2 M1, M2 MOSFET N-CH 80V 55A TDSON-8 INFINEON BSC123N08NS3 G
15 2 M3, M4 MOSFET N-CH 60V 19A TDSON-8 INFINEON BSC039N06NS
16 2 R8, R9 RES 10.0Ω 1/10W 1% 0603 SMD VISHAY CRCW060310R0FKEA
17 1 R11 RES 71.5k 1/10W 1% 0603 SMD PANASONIC ERJ-3EKF7152V
18 1 R13 RES 392k 1/10W 0.1% 0603 SMD VISHAY MCT06030D3923BP100
19 1 R14 RES 20.0k 1/10W 1% 0603 SMD VISHAY CRCW060320K0FKEA
20 1 R16 RES 10.0k 1/10W 0.1% 0603 SMD PANASONIC ERA-3AEB103V
21 2 R27, R46 RES 100k 1/10W 1% 0603 SMD VISHAY CRCW0603100KFKEA
22 4 R38, R41, R51, R58 RES 2.00Ω 1/10W 1% 0603 SMD VISHAY CRCW06032R00FKEA
23 1 R40 RES 0.01Ω 3W 2512 5% SMD TT ELECTRONICS LRF3WLF-01-R010-J
24 4 R42, R43, R44, R45 RES 549Ω 1/10W 1% 0603 SMD VISHAY CRCW0603549RFKEA
25 1 R47 RES 210k 1/10W 1% 0603 SMD VISHAY CRCW0603210KFKEA
26 1 R49 RES 24.3k 1/10W 1% 0603 SMD VISHAY CRCW060324K3FKEA
27 1 R50 RES 56.2k 1/10W 1% 0603 SMD VISHAY CRCW060356K2FKEA
28 1 R57 RES 0.007Ω 1W 1% 2512 SMD VISHAY CRCW25127L000FEA
29 1 R62 RES 4.02Ω 1/10W 1% 0603 SMD VISHAY CRCW06034R02FKEA
30 1 U1 LT8705 SYNCHRONOUS 4 SWITCH BUCK-BOOST
DC/DC CONTROLLER LINEAR TECH LT8705EUHF#PBF
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DEMO MANUAL DC1924A
Additional Demo Board Circuit Components
1 0 C12, C60 CAP 0603 OPTION CAP 0603 OPTION
2 0 C53, C54, C66-C71 CAP 1812 OPTION CAP 1812 OPTION
3 0 M1-1, M2-1, M3-1, M4-1 MOSFET POWER56 OPTION MOSFET POWER56 OPTION
4 0 R53, R54, R59, R60 RES 0603 OPTION RES 0603 OPTION
5 5 R22, R39, R48, R55 RES 0.0Ω 1/10W 0603 SMD VISHAY CRCW06030000Z0EA
6 2 R56 RES 0.0Ω 1.5W 2512 SMD VISHAY CRCW25120000Z0EG
Hardware: For Demo Board Only
1 1 JP1 CONN HEADER 4POS 2MM VERT T/H SAMTEC TMM-104-02-L-S
2 4 TP1, TP2, TP3, TP4 JACK NON-INSULATED 0.218" KEYSTONE 575-4
3 14 TP5, TP8-TP20 TERM SOLDER TURRET 0.094 MILL-MAX 25012-00-80-00-00-07-0
4 1 SHUNT1 CONN SHUNT 2MM 2POS SAMTEC 2SN-BK-G
5 4 MH1, MH2, MH3, MH4 SPACER STACKING #4 SCREW NYLON KEYSTONE ELECTRONICS 8833
6 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT #1924A
PARTS LIST
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DEMO MANUAL DC1924A
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
6
6
5
5
4
4
3
3
2
2
1
1
4
4
3
3
2
2
1
1
VIN 36V to 80V
VOUT 48V / 5A
AGND
/SHDN
MODE
LDO33
SS
SYNC
CLKOUT
SWEN
SRVO_FBOUT
SRVO_IOUT
SRVO_IIN
SRVO_FBIN
PGND PGND
AGND
SRVO_FBOUT
SRVO_IOUT
SRVO_IIN
SRVO_FBIN
EXTVCC
SEE NOTE 3
NOTES (UNLESS OTHERWISE SPECIFIED): ____________________________ 1- ALL SMD CAPACITORS ARE 16V. 2- ALL SMD CAPACITORS AND RESISTORS ARE 0603. 3- CUT TRACE TO DISCONNECT EXTVCC FROM VOUT AND SUPPLY EXTVCC THROUGH TP20.
DCM
FCM
BURST
TG2
FBIN
LDO33
TG2
TG1
LDO33
BG1
TG1
LDO33
BG2
EXTVCC
GATEVCC
VOUT
GATEVCC
VOUT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Thursday, June 26, 2014
12
80V / 48V Synchronous Buck-Boost Controller
S. M. MEHDI A.
N/A
LT8705EUHF
DEMO CIRCUIT 1924A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Thursday, June 26, 2014
12
80V / 48V Synchronous Buck-Boost Controller
S. M. MEHDI A.
N/A
LT8705EUHF
DEMO CIRCUIT 1924A
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Thursday, June 26, 2014
12
80V / 48V Synchronous Buck-Boost Controller
S. M. MEHDI A.
N/A
LT8705EUHF
DEMO CIRCUIT 1924A
R13 392K R13 392K
R55
0
R55
0
C49
4.7µF
1812
100V
C49
4.7µF
1812
100V
M4-1
OPT.
M4-1
OPT.
4
53 62
1 7
8
R50 56.2K R50 56.2K
C59 1µF C59 1µF
R54 OPT. R54 OPT.
+
C64
220µF 100V
+
C64
220µF 100V
D2
CMMR1U-02
D2
CMMR1U-02
21
C65
1.0µF
100V
0805
C65
1.0µF
100V
0805
C71 OPT. C71 OPT.
R46 100K R46 100K C60
OPT.
C60
OPT.
C58
4.7µF
C58
4.7µF
+
C55
220µF 100V
+
C55
220µF 100V
C12 OPT. C12 OPT.
TP17TP17
D3D3
12
R47 210K R47 210K
M2-1
OPT.
M2-1
OPT.
4
53
62
1 7
8
R60 OPT. R60 OPT.
R27
100K
R27
100K
TP8TP8
C53 OPT. C53 OPT.
R43
549
R43
549
R38
2
R38
2
TP11TP11
C15
1nF
C15
1nF
R56
0
2512
R56
0
2512
C56 4.7µF C56 4.7µF
C69
OPT.
C69
OPT.
TP20TP20
C54
OPT.
C54
OPT.
R45
549
R45
549
TP4TP4
C14 1nF C14 1nF
M1 BSC123N08NS3 G M1 BSC123N08NS3 G
4
5 3 6 2
17
8
R51
2
R51
2
R40
0.010
1225 Wide
R40
0.010
1225 Wide
R48 0 R48 0
R59 OPT. R59 OPT.
M1-1
OPT
M1-1
OPT
4
5 3 6 2
17
8
C48
4.7µF
100V 1812
C48
4.7µF
100V 1812
TP16TP16
TP13TP13
D4D4
12
TP3TP3
TP15TP15
TP12TP12
C46 1.0µF
100V 0805
C46 1.0µF
100V 0805
C50
4.7µF
100V
1812
C50
4.7µF
100V
1812
TP5TP5
TP10TP10
R22 0 R22 0
C43
4.7µF
100V
1812
C43
4.7µF
100V
1812
C42
4.7µF
100V
1812
C42
4.7µF
100V
1812
R57
0.007
2512
R57
0.007
2512
TP14TP14
C41
4.7µF
100V
1812
C41
4.7µF
100V
1812
R41
2
R41
2
C57
4.7µF
C57
4.7µF
R9
10
R9
10
TP18TP18
TP1TP1
R62
4.02
R62
4.02
R14
20K
R14
20K
R16 10K R16 10K
L1
22µH
L1
22µH
C63 3300pF
25V
C63 3300pF
25V
C68 OPT. C68 OPT.
D5D5
12
R58
2
R58
2
C66
OPT.
C66
OPT.
R49 24.3K R49 24.3K
TP2TP2
+
C45
220µF 100V
+
C45
220µF 100V M3
BSC039N06NS
M3
BSC039N06NS
4
53
62
1 7
8
M2
BSC123N08NS3 G
M2
BSC123N08NS3 G
4
53
62
1 7
8
+
C52
220µF 100V
+
C52
220µF 100V
R44
549
R44
549
M3-1 OPT M3-1 OPT
4
53
62
1 7
8
R42
549
R42
549
TP9TP9
R39 0 R39 0
U1
LT8705EUHF
U1
LT8705EUHF
INTVCC
35
MODE
37
IMONIN
38
#SHDN
1
CSN 2
CSP 3
LDO33
4
FBIN
5FBOUT 6
IMONOUT
7
RT
12
BG2 16
GATEVCC
15
BG1 14
BOOST2 17
TG2 18
SW2 19
SW1 21
TG1 22
BOOST1 23
EXTVCC
29
CSNOUT 30
CSPOUT 31
CSNIN
32
CSPIN
33
AGND
13
VIN
34
39 PGND
SYNC
11
VC
8
SS
9
CLKOUT 10
N/C 20 N/C 24
SRVO_FBOUT 28
SRVO_FBIN 25
SRVO_IIN 26
SRVO_IOUT 27
SWEN 36
C13
0.22µF
C13
0.22µF
C61 0.1uF C61 0.1uF
R8
10
R8
10
M4
BSC039N06NS
M4
BSC039N06NS
4
53 62
1 7
8
C67 OPT. C67 OPT.
C44
4.7µF
100V
1812
C44
4.7µF
100V
1812
R53
OPT.
R53
OPT.
TP19TP19
D6D6
12
JP1JP1
1 2 3 4
C47
0.22µF
C47
0.22µF
R11 71.5K R11 71.5K
C62 220pF
25V
C62 220pF
25V
C51
4.7µF
100V 1812
C51
4.7µF
100V 1812
C70
OPT.
C70
OPT.
D1
CMMR1U-02
D1
CMMR1U-02
21
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DEMO MANUAL DC1924A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2013
LT 0714 REV A • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C) provides the enclosed product(s) under the following AS IS conditions:
Thisdemonstrationboard(DEMO BOARD) kit being sold or provided by Linear TechnologyisintendedforuseforENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases 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. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
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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