Linear Technology DC2641A Quick setup guide

dc2641af

DEMO MANUAL DC2641A

DESCRIPTION

LTC7801EUFD

High Input Voltage

Synchronous Buck Converter

Demonstration circuit 2641A is a single output synchro-

nous buck converter featuring the LTC7801EUFD in the

24-lead QFN package. The input voltage range is from

16V to 100V and the output is 12V/10A. The DC2641A is

configured with a sense resistor for overcurrent protec-

tion. Inductor DCR current sensing is optional.

The board has a lot of features including an optional

onboard NMOS LDO for DRVCC, a switch-mode power

supply for EXTVCC, jumper selectable 100% duty cycle

operation in dropout, a mode selector pin that allows

the converter to run in CCM, pulse-skip, adjustable burst

L, LT, LTC, LTM, Linear Technology, Burst Mode, PolyPhase and the Linear logo are registered

trademarks of Analog Devices, Inc. All other trademarks are the property of their respective

owners.

PERFORMANCE SUMMARY

clamp or default Burst Mode®operation, a PGOOD output

voltage monitor and PLLIN for PolyPhase®operation.

The LTC7801 data sheet gives a complete description

of the part, operation and application information and

must be read in conjunction with this demo manual for

DC2641A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2641A

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Input Voltage Range 16V ~ 100V

Output Voltage VOUT VIN = 16~100V, IOUT = 0~10A, JP4: FCM 12V ± 2% (11.76V ~ 12.24V)

Maximum Output Current IOUT,MAX VIN = 16~100V 10A

Default Operating Frequency (Typical) 150kHz

External Clock Sync. Frequency Range 75kHz – 850kHz

Typical Full Load Efficiency (See Figure 4) VIN = 48V, VOUT = 12V, IOUT = 10A, fSW = 150 kHz 95.3%

dc2641af

DEMO MANUAL DC2641A

QUICK START PROCEDURE

Demonstration circuit DC2641A is easy to set up to

evaluate the performance of the LTC7801EUFD. Refer to

Figure 1 for proper measurement equipment setup and

follow the procedure below:

NOTE:When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. Measure the input or output voltage

ripple by touching the probe tip directly across the V

or V

OUT

and GND terminals or directly across relevant

capacitor. See Figure 2 for proper scope probe technique.

1. Place jumpers in the following positions:

JP1 ON

JP4 FCM

JP5 ON

JP8 OFF

2. With power off, connect the input power supply to VIN

and GND.

3. Turn on the power at the input.

NOTE:Make sure that the input voltage is higher than

16V and does not exceed 100V.

4. Check the output voltage. The output voltage should

be between 11.76V and 12.24V.

Once the proper output voltage is established, adjust

the load within the operating range and observe the

output voltage regulation, output voltage ripple, effi-

ciency and other parameters.

NOTE:If there is no output, temporarily disconnect the

load to make sure that the load is not set too high.

dc2641af

DEMO MANUAL DC2641A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

IIN

IOUT

–

VIN SUPPLY

–

LOAD

DC2641A F01

+ –

VOUT GND

COUT

Figure 2. Measuring Input or Output Ripple Across Terminals or Directly Across Ceramic Capacitor

dc2641af

DEMO MANUAL DC2641A

FREQUENCY SYNCHRONIZATION AND MODE SELECTION

Table 1. Mode Selection and Synchronized Operation Options

CONFIGURATION JP4 MODE WITH SYNC. SIGNAL APPLIED TO PLLIN

Forced Continuous Operation FCM FCM

Pulse-Skipping Operation P.S. P.S.

Burst Mode Operation with Adjustable Clamp Level Burst ADJ. FCM

Burst Mode Operation with Default Clamp Burst Default FCM

Table 2. Optional Inductor DCR Current Sensing

CONFIGURATION RS1 R24 R28 C16 R37 R38 R39 R40

Current Sense Resistor (Default) Ref. Sch. Ref. Sch. Ref. Sch. OPEN OPEN OPEN OPEN OPEN

Inductor DCR Current Sensing 0Ω Copper OPEN OPEN Calculated Value from Data Sheet 0Ω 0Ω

Demonstration circuit 2641A’s Mode selector allows the

converter to run in forced continuous operation, pulse-

skipping operation, Burst Mode or Burst mode with

adjustable clamp level by changing the position of JP4.

To synchronize the DC2641A to an external clock, apply

the sync signal to the PLLIN turret. Depending upon the

JP4 setting, the DC2641A will operate in different modes.

See Table 1 for the detailed description.

100% DUTY

Demonstration circuit 2641A features 100% duty cycle

operation in dropout. Set the JP5 to “ON”position to acti-

vate this feature. Set JP5 to “OFF” position disables the

internal charge pump and enables boost refresh, allowing

for 99% duty cycle operation in dropout.

OPTIONAL INDUCTOR DCR CURRENT SENSING

Demonstration circuit 2641A provides an optional circuit

for Inductor DCR Current Sensing. Inductor DCR Cur-

rent Sensing uses the DCR of the inductor to sense the

inductor current instead of discrete sense resistors. The

advantages of DCR sensing are lower cost, reduced board

space and higher efficiency, but the disadvantage is a less

accurate current limit. If DCR sensing is used, be sure to

select an inductor current with a sufficiently high satura-

tion current or use an iron powder type material.

Refer to Table 2 for Optional Inductor DCR Current Sens-

ing setup and to the data sheet for more details.

Low Quiescent Current Applications and Measurement

The typical quiescent current (I

) of the LTC7801 control-

ler is 40µA in sleep mode as specified in the LTC7801

data sheet. However, the input current of the DC2641A

board can be higher than this value because of additional

circuit outside of the IC. To reduce the total input current,

large value FB divider resistors should be used. In addi-

tion, some jumpers and resistors should be configured

accordingly. Refer to Table 3 for the low input quiescent

current setup.

Table 3. Low Input Quiescent Current Configuration

REFERENCE DESIGNATOR R1 R2 R23 JP3 JP4 JP5 JP8

Function OVLO PGOOD INTVCC Jumper MODE Selector 100% DUTY BIAS supply

Stuffing Option OPEN 0Ω OPEN OPEN BURST ADJ. or

BURST DEFAULT

OFF OFF

dc2641af

DEMO MANUAL DC2641A

EXTVCC BIAS SUPPLY

By default, the DC2641A EXTVCC turret is tied to the 12V

VOUT.

To power the EXTVCC from on-board bias supply:

1. Leave the JP7 OPEN. This step disconnects the EXTVCC

from VOUT.

2. Keep the JP8 at the “ON” position. The on-board BIAS

supply output voltage is 12V.

Alternatively, EXTVCC can also be powered by an external

power supply:

1. Leave the JP7 OPEN.

2. Keep the JP8 at the “OFF” position.

3. Apply a DC voltage (<14V) between the EXTVCC and

GND turret, after the input voltage is established.

Ensure that EXTVCC ≤ VIN.

100

012345678910

Efﬁciency (%)

IOUT (A) DC2641A F03

VIN = 100V

VIN = 72V

VIN = 48V

VIN = 16V

Figure 3. DC2641A VOUT Typical Efficiency vs Load Current

dc2641af

DEMO MANUAL DC2641A

EXTVCC BIAS SUPPLY

Figure 4. DC2641A VOUT 0~2.5A Load Transient at VIN = 48V

Figure 5. Thermal Image VIN 48V, VO12V at 10A No Air Flow, TA= 25°C

20MHz BW

100mV/DIV

DC2641 F04

50µs/DIV

VOUT

dc2641af

DEMO MANUAL DC2641A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP., 100µF, ELECT, 200V, 20%, 16×20mm, THT, NRB-XS Series NIC NRB-XS101M200V16x20TBF

2 5 CIN3, CIN4, CIN8, C14,

C15

CAP., 2.2µF, X7R, 100V, 10%, 1812 TDK, C4532X7R2A225K230KA

3 3 CIN2, CIN6, CIN7 CAP, 1µF, X7R, 10V, 10%, 0805 AVX 0805ZC105KAT2A

4 1 COUT1 CAP, 22µF, X7R, 16V, 10%, 1210 TDK, C3225X7R1C226K250AC

5 2 COUT2, COUT3 CAP., 150µF, TANT, 16V, 20%, 7343, D-CASE AVX TPSD157M016R0125

6 3 C2, C4, C13 CAP, 0.1µF, X7R, 25V, 10%, 0603 AVX, 06033C104KAT2A

7 1 C3 CAP, 1000pF, X7R, 50V, 10%, 0603 AVX 06035C102KAT2A

8 1 C6 CAP, 4700pF, X7R, 50V, 10%, 0603 AVX 06035C472KAT2A

9 1 C7 CAP, 1µF, X7R, 16V, 20%, 0603 TDK, C1608X7R1C105M080AC

10 1 C9 CAP, 10pF, X7R, 50V, 10%, 0603 AVX 06035C100KAT2A

11 1 C10 CAP., 100pF, C0G, 50V, 5%, 0603 AVX 06035A101JAT2A

12 1 C11 CAP, 0.1µF, X7R, 100V, 10%, 1206 AVX 12061C104KAT2A

13 1 C12 CAP, 4.7µF, X5R, 16V, 20%, 0603 TDK C1608X5R1C475M080AC

14 1 L1 IND., 33µH, PWR, 15%, 12A, 11.4mΩ, 2013 WURTH ELEKTRONIK 7443633300

15 1 L2 IND., 470µH, PWR, 10%, 0.72A, 886mΩ, 10.0×10.2×4.8mm,

MSS1048T Series, AEC-Q200

COILCRAFT MSS1048T-474KLB

16 2 Q2, Q3 XSTR., PWR MOSFET, N-CH, 120V, 44A, PG-TDSON-8, SuperSO8 INFINEON BSC190N12NS3 G

17 1 Q4 XSTR., PWR MOSFET, N-CH, 120V, 98A, PG-TDSON-8, SuperSO8 INFINEON BSC077N12NS3 G

18 1 RS1 RES, 0.006Ω, 1%, 2W, 2512, HIGH PWR, SENSE, AEC-Q200 VISHAY WSL25126L000FEA18

19 1 R6 RES., 301kΩ, 1%, 1/10W, 0603 VISHAY CRCW0603301KFKEA

20 1 R9 RES., 10MΩ, 5%, 1/8W, 0805, AEC-Q200 VISHAY CRCW080510M0JNEA

21 1 R12 RES., 2.2Ω, 5%, 1/8W, 0805, AEC-Q200 VISHAY CRCW08052R20JNEA

22 2 R13, R14 RES., 10kΩ, 5%, 1/10W, 0603, AEC-Q200 VISHAY CRCW060310K0JNEA

23 1 R15 RES., 140kΩ, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCW0603140KFKEA

24 3 R16, R17, R23 RES., 100kΩ, 1%, 1/10W, 0603 VISHAY CRCW0603100KFKEA

25 1 R18 RES., 49.9kΩ, 1%, 1/10W, 0603 VISHAY CRCW060349K9FKEA

26 1 R25 RES., 30.1kΩ, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCW060330K1FKEA

27 1 R26 RES., 80.6kΩ, 1%, 1/10W, 0603 VISHAY CRCW060380K6FKEA

28 2 R30, R36 RES., 10Ω, 1%, 1/10W, 0603 VISHAY CRCW060310R0FKEA

29 1 R31 RES., 2MΩ, 1%, 1/10W, 0603, AEC-Q200 VISHAY CRCW06032M00FKEA

30 1 R32 RES., 267kΩ, 1%, 1/10W, 0603 VISHAY CRCW0603267KFKEA

31 1 R34 RES., 196kΩ, 1%, 1/10W 0603 VISHAY CRCW0603196KFKEA

32 1 U1 IC, HIGH VOLTAGE DC/DC BUCK REG., QFN-24 (4mm×5mm) LINEAR TECH. LTC7801UFD#PBF

33 1 U2 IC, SYNCHRONOUS STEP DOWN REGULATOR, 150V, 100mA,

MSOP-16

LINEAR TECH LTC3639EMSE#PBF

dc2641af

DEMO MANUAL DC2641A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Additional Demo Board Circuit Components

1 0 CIN5 (OPT) CAP, OPT 1812 OPTION

2 0 COUT4 (OPT) CAP, OPTION 7343 OPTION

3 0 C1, C5, C8, C16 (OPT) CAP, OPTION 0603 OPTION

4 0 D1 (OPT) DIODE, OPTION SOD-123 OPTION

5 0 D2 (OPT) DIODE, OPTION SOD-323 OPTION

6 0 L4 (OPT) IND., 22µH, PWR, 10%, 30A, 2.05mΩ, 27.9×19.8×15.36mm,

SER2915H Series, AEC-Q200

COILCRAFT SER2915H-223KL OPTION

7 0 Q1, Q6, Q7 (OPT) XSTR, OPTION TO252-3 OPTION

8 0 Q5 (OPT) XSTR, OPTION LFPAK OPTION

9 0 Q12, Q13 (OPT) XSTR, OPT IN_PG_TS OPTION

10 0 R1 (OPT) RES, OPTION 0805 OPTION

11 8 R2, R8, R22, R24, R27,

R28, R29, R35

RES, 0Ω 1/10W 0603 VISHAY CRCW06030000Z0EA

12 0 R7, R11, R19, R20,

R21, R37, R38, R39,

R40(OPT)

RES, OPTION 0603 OPTION

13 0 R33 (OPT) RES, OPTION 1206 OPTION

Additional

1 10 E1-E10 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX 2501-2-00-80-00-00-07-0

2 3 JP1, JP2, JP5 CONN., HDR, MALE, 1×3, 2mm, THT, STR WURTH ELEKTRONIK, 62000311121

3 3 JP3, JP6, JP7 CONN., HDR, MALE, 1×2, 2mm, THT, STR WURTH ELEKTRONIK, 62000211121

4 1 JP4 CONN., HDR, MALE, 2×4, 2mm, THT, STR WURTH ELEKTRONIK, 62000821121

5 4 J1, J2, J3, J4 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED, SWAGE KEYSTONE 575-4

6 7 XJP1, XJP2, XJP3,

XJP4, XJP5, XJP6,

XJP7

CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

7 4 MH1, MH2, MH3, MH4 STANDOFF, NYLON, SNAP-ON, 0.50" WURTH ELEKTRONIK, 702935000

dc2641af

DEMO MANUAL DC2641A

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

A A

B B

C C

D D

VOUT

GND

FCM

P.S.

BURST ADJ.

BURST DEFAULT

7443633300

MSS104BT

EXTVCC

INTVCC

VIN

INTVCC

VIN

VOSP

2SW

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

Monday, April 10, 2017

HIGH VOLTAGE DC-DC BUCK REGULATOR

D L

N/A

LTC7801UFD

DEMO CIRCUIT 2641A

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

Monday, April 10, 2017

HIGH VOLTAGE DC-DC BUCK REGULATOR

D L

N/A

LTC7801UFD

DEMO CIRCUIT 2641A

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

Monday, April 10, 2017

HIGH VOLTAGE DC-DC BUCK REGULATOR

D L

N/A

LTC7801UFD

DEMO CIRCUIT 2641A

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

PRODUCTION

304/10/17

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

PRODUCTION

304/10/17

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

PRODUCTION

304/10/17

E10

RUN

R11

OPT

R38

OPT

JP2

OFF

VBIAS

LTC7801UFD

INTVCC 20

OVLO

DRVSET

DRVUV

10 TG 11

FREQ

PGOOD

RUN 19

SENSE1-

GND

BG 14

BOOST 13

PLLIN

SENSE1+

NDRV 16

DRVCC 15

GND

MODE

EXTVCC 18

VIN 17

VFB

ITH

CPUMP_EN

SW 12

R36

C13

0.1uF

C14

4.7uF

100V

1812

JP7

VIN-

R27

10M

0805

R29

BSC190N12NS3G

R31

COUT1

22uF

16V

1210

R14

10k

JP3

RS1

0.006

2512

C1 OPT

R32

267k

R37 OPT

C9 10pF

L1 33uH

PGOOD

VIN

16V - 100V

1nF

CIN4

4.7uF

100V

1812

C8 OPT

JP6

JP4

MODE

1 2

3 4

5 6

7 8

BSC190N12NS3G

R33

OPT

1206

OPT

COUT2

150uF

16V

7343

CIN5

OPT

100V

1812

PLLIN

CIN6

1uF

100V

0805

R21

OPT

1uF

R24 0

R34

196k

OPT

C12

4.7uF

OPT

R35

C16 OPT

R17

100k

CIN3

4.7uF

100V

1812

R13

10K

COUT3

150uF

16V

7343

GND

0.1uF

C2 0.1uF

R15

140k 1%

R25

30.1k

L2 470uH

R8 0

R40 OPT

COUT4

OPT

7343

R18

49.9k

R28 0

OPT

R16

100k

EXTVCC

R26

80.6k

OPT

R12

2.2

0805

GND

CIN7

1uF

100V

0805

CIN2

1uF

100V

0805

CIN8

4.7uF

100V

1812

C6 4700pF

JP1

OFF

RUN

R39

OPT

CIN1

100uF

200V

OPT

C11

0.1uF

100V

1206

R2 0

R30

OPT

C10 100pF

MODE

R23

100K

R22 0

OPT

0805

R20

OPT

VOUT

12V/10A

LTC3639EMSE

SW 1

VIN

FBO

VPRG1 7

VPRG2 6

GND

VFB 9

SS 10

ISET

OVLO

RUN

GND

301k

JP5

OFF

100% DUTY

VIN

R19

OPT

C15

4.7uF

16V

1812

BSC077N12NS3G

SENSE1-

SENSE1+

VOUT

SENSE1+

SENSE1-

EXTVCC

dc2641af

DEMO MANUAL DC2641A

 LINEAR TECHNOLOGY CORPORATION 2017

LT 0517 • 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 application

engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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