DC2475A-A - LT4295, LT4321 High Efficiency IEEE802.3bt ...

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DEMO MANUAL DC2475A-A

DESCRIPTION

LT4295, LT4321 High Efficiency IEEE802.3bt (PoE++, Type 3,

40W) PD with PoE Ideal Diode Bridge

Demonstration circuit 2475A-A is an IEEE802.3bt (Draft 2.0) compliant Power over Ethernet (PoE) powered device (PD). It features the LT®4295 PD interface and switching regulator controller with the LT4321 PoE ideal diode bridge controller.

The LT4295 provides IEEE802.3af (PoE, Type 1), IEEE802.3at (PoE+, Type 2), and IEEE802.3bt (PoE++, Type 3 and 4) compliant interfacing and power supply control. It utilizes an external, low RDS(ON) (57mΩ typi-cal) N-channel FET for the Hot Swap function to improve efficiency. The LT4295 controls a DC/DC converter that utilizes a highly efficient flyback topology with synchro-nous rectification.

The LT4321 controls eight low RDS(ON) (57mΩ typical) N-channel FETs to further improve end-to-end power

L, LT, LTC, LTM, Linear Technology, the Linear logo and LTPoE++ are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

BOARD PHOTO

delivery efficiency and ease thermal design. This solution replaces the eight diodes typically found in a passive PoE rectifier bridge.

The DC2475A-A accepts up to 40W of delivered power from a power sourcing equipment (PSE) via the RJ45 connector (J1) or a local 48VDC power supply using the auxiliary supply input. When both supplies are connected, the auxiliary supply input has priority over the PoE input. The DC2475A-A supplies a 12V output at up to 3A.

Design files for this circuit board are available at http://www.linear.com/demo/DC2475A-A

Top Side

PARAMETER CONDITIONS VALUE

Port Voltage (VPORT) At RJ45 37V to 57V

Auxiliary Voltage From AUX+ to AUX– Terminals 37V to 57V

Output Voltage (VOUT) 12V (Typical)

Output Current (IOUT) 3A (Max)

Output Voltage Ripple VPORT = 44V, IOUT = 3A 85mVP-P (Typical)

Load Regulation ±0.1% (Typical)

Efficiency VPORT = 50V, IOUT = 3A, End-to-End 92% (Typical)

Switching Frequency 250kHz (Typical)

Bottom Side

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TYPICAL PERFORMANCE CHARACTERISTICS

Top Side Bottom Side

Figure 1. Thermal Pictures (Conditions: VPORT = 44V, VOUT = 12V, IOUT = 3A)

Figure 2. Efficiency (End-to-End)

LOAD CURRENT (A)

0 0.5 1 1.5 2 2.5 30

10

20

30

40

50

60

70

80

90

100

EFF

ICIE

NC

Y (

%)

DC2475AA F02

44V

50V

57V

VPORT

Figure 3. Load Regulation

LOAD CURRENT (A)

0 0.5 1 1.5 2 2.5 311.80

11.85

11.90

11.95

12.00

12.05

12.10

12.15

12.20

VO

UT (

V)

DC2475AA F03

44V

50V

57V

VPORT

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Figure 4. Switch Node Waveforms (Conditions: VPORT = 57V, VOUT = 12V, IOUT = 3A)

Figure 5. Output Voltage Ripple (Conditions: VPORT = 44V, VOUT = 12V, IOUT = 3A)


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Figure 6. Load Transient Response (Conditions: VPORT = 44V, Load Step: 1.5A to 3A to 1.5A)

Figure 7. Gain and Phase Margin of the Flyback DC/DC Converter (Conditions: VPORT = 44V, VOUT = 12V, IOUT = 3A)


CROSSOVER FREQUENCY (kHz) GAIN MARGIN (dB) PHASE MARGIN (deg)

5 20 64

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QUICK START PROCEDURE

Power over Ethernet (PoE) Input

1. Disconnect auxiliary supply if it is connected to AUX+ and AUX– inputs of the DC2475A-A.

2. Place and connect test equipment (voltmeter, ammeter, oscilloscope, and electronic load) as shown in Figure 8.

3. Turn down the electronic load to a minimum value and turn off the electronic load.

4. Connect the DC power supply to the DC1814A-B. Turn on the DC power supply and set its current limit to 2A. Then increase its output voltage to 57V.

Note: In the interim, an LTPoE++® compliant PSE (DC1814A-B) is used to provide power to the DC2475A-A. T2P output of the DC2475A-A is different from the behavior stated in Table 1.

Figure 8. Setup Diagram for PoE Input

It is recommended to use an IEEE802.3bt compliant PSE for the proper handshaking sequence and the correct T2P output behavior when such a PSE is available in the market.

5. Connect the output of the DC1814A-B to the RJ45 connector (J1) of the DC2475A using a CAT5e or CAT6 Ethernet cable.

6. After the LED (D4) on the DC2475A is lit, check the output voltage using a voltmeter. Output voltage should be within 12.0V ± 0.2V.

7. Turn on the electronic load and increase its load cur-rent up to 3A. Observe the output voltage regulation, efficiency, and other parameters.

8. Verify T2P response with an oscilloscope as shown in Figure 8. The T2P response to the type of PSE connected to the DC2475A-A is provided in Table 1.

Table 1. T2P Response vs PSE Type

PSE TYPE T2P RESPONSE PD OUTPUT POWER (W)

1 (PoE, 15.4W) Logic High 10.8

2 (PoE+, 30W) Logic Low 22.8

3 (PoE++, 60W) 50% Logic High/50% Logic Low, Toggle at 970Hz ±7% 36

4 (PoE++, 90W) 75% Logic High/25% Logic Low, Toggle at 970Hz ±7% 36

LTPoE++, 52.7W Logic Low 36

DC1814A-BLTPoE++ PSE

+

–

DC POWERSUPPLY

+

–

AMMETER

+

–

VOLTMETER

+

–

ELECTRONICLOAD

+

–

OSCILLOSCOPE+

–

CAT5eOR CAT6CABLE

J1

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Figure 9: Setup Diagram for Auxiliary Supply Input

Auxiliary Supply Input

1. Place and connect test equipment (voltmeter, ammeter, oscilloscope, and electronic load) as shown in Figure 9.

2. Turn down the electronic load to a minimum value and turn off the electronic load.

3. Connect the output of the auxiliary supply to the DC2475A as shown in Figure 9. Turn on the auxiliary supply and set its current limit to 2A. Then increase its output voltage to 48V.

QUICK START PROCEDURE4. Once the LED (D4) on the DC2475A is lit, check the

output voltage using a voltmeter. Output voltage should be within 12.0V ± 0.2V.

5. Turn on the electronic load and increase its load cur-rent up to 3A. Observe the output voltage regulation, efficiency, and other parameters.

6. Verify T2P response with an oscilloscope as shown in Figure 9. The T2P response during auxiliary power operation is provided in Table 2.

Table 2. T2P Response During Auxiliary Power Operation

T2P RESPONSE PD OUTPUT POWER (W)

75% Logic High/25% Logic Low, Toggle at 976Hz ±7% 36

AMMETER

+

–

VOLTMETER

+

–

ELECTRONICLOAD

+

–

OSCILLOSCOPE+

–

J1

AUXILIARY SUPPLY+ –

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PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

DC2475A General BOM

1 1 CG1 CAP, CER, X7R 1000pF 2kV 10% 1808 MURATA GR442QR73D102KW01L

2 1 CG2 CAP, CER, X7R 0.01µF 100V 20% 1206 AVX 12061C103MAT2A

3 0 C1 CAP, CER, OPT 2kV 1812 OPT

4 0 C5 CAP, CER, X7U OPT 6.3V 10% 1210 OPT

5 1 C6 CAP, ELEC, 10µF 100V 10% 6.3x7.7 SUNCON 100CE10BS

6 1 C7 CAP, CER, X7R 2.2µF 100V 10% 1210 MURATA GRM32ER72A225KA35

7 1 C10 CAP, CER, X7R 10nF 100V 20% 0603 MURATA GRM188R72A103KA01D

8 1 C11 CAP, CER, X7R 0.047µF 100V 20% 0603 KEMET C0603C473M1RACTU

9 1 C12 CAP, CER, X7R 0.047µF 100V 10% 0805 MURATA GRM21BR72A473KA01L

10 1 C13 CAP, CER, X7R 10µF 10V 10% 1206 MURATA GRM31CR71A106KA01L

11 0 C15, C18, C19, C21 CAP, CER, X5R OPT 2kV 20% 1812 OPT

12 1 C17 CAP, CER, X7R 1µF 25V 10% 0603 MURATA GRM188R71E105KA12

13 1 C20 CAP, CER, X7R 2.2nF 25V 10% 0603 MURATA GRM188R71E222KA01

14 1 C23 CAP, CER, X7R 4.7nF 2kV 1812 MURATA GR443DR73D472KW01L

15 1 C26 CAP, CER, X7R 100pF 16V 0402 AVX, 0402YC101KAT2A

16 0 C27 CAP, CER, X7R OPT 6.3V 10% 0402 OPT

17 1 D1 DIODE, SCHOTTKY, B2100 100V SMB DIODES INC B2100-13-F

18 1 D2 DIODE, TVS, PTVS58VS1UR 58V SOD123 NXP PTVS58VS1UR

19 1 D3 DIODE, ZENER, MMSZ5252BS 24V SOD323 DIODES INC MMSZ5252BS

20 1 D4 DIODE, LED GREEN ROHM SML-010FTT86L

21 1 D13 DIODE, SCHOTTKY, NXP, BAT46W 100V SOD323 NXP BAT46WJ,115

22 1 D15 DIODE, DIODE INC, BAV19WS 120V SOD323 DIODE INC BAV19WS


24 1 D17 DIODE, SCHOTTKY, PMEG1020EA 10V SOD323 NXP PMEG1020EA


26 7 E1, E2, E3, E4, E9, E10, E12

TP, TURRET, PAD150-094 0.094" MILL-MAX 2501-2-00-80-00-00-07-0

27 1 J1 CONN, INTEGRATED JACK, 7499511001 WURTH 7499511001A

28 1 J2 CONN, RJ45 JACK, SS-6488-NF-K1 STEWART CONNECTOR SS-6488-NF-K1 ALTERNATE SS-6488S-A-NF

29 1 L2 IND, 10µH COILCRAFT DO1608C-103

30 1 L4 IND, 100µH COILCRAFT DO1608C-104

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31 9 Q1, Q11, Q12, Q13, Q14, Q15, Q16, Q17, Q18

MOSFET, N-CH, PSMN075-100MSE 100V LFPAK33 NXP PSMN075-100MSE

32 1 Q5 TRANSISTOR, PNP, MMBT3906 40V SOT23 FAIRCHILD MMBT3906

33 1 Q6 TRANSISTOR, NPN, MMBT3904 40V SOT23 FAIRCHILD MMBT3904

34 1 Q7 TRAN, PNP, FMMT723 100V SOT23 DIODES INC FMMT723TA

35 0 Q7 (ALTERNATE) TRAN, PNP, PBSS9110T 100V SOT23 NXP PBSS9110T

36 4 RT1, RT2, RT3, RT4 RES, CHIP, 75Ω 5% 0603 NIC NRC06J750TRF

37 1 R5 RES, CHIP, 8.2Ω 5% 0805 NIC NRC10J8R2TRF

38 1 R6 RES, CHIP, 3.3k 5% 0603 NIC NRC06J332TRF

39 1 R7 RES, CHIP, 20Ω 5% 0805 VISHAY CRCW080520R0JNEA

40 1 R12 RES, CHIP, 0Ω 5% 0603 NIC NRC06ZOTRF

41 1 R13 RES, CHIP, 100Ω 5% 0603 VISHAY CRCW0603100RFKEA

42 1 R15 RES, CHIP, 15Ω 5% 0603 NIC NRC06J150TRF

43 1 R17 RES, CHIP, 2.00k 1% 0603 NIC NRC06F2001TRF

44 1 R18 RES, CHIP, 10k 5% 0603 YAGEO RC0603JR-0710KL

45 1 R21 RES, CHIP, 174k 1% 0603 VISHAY CRCW0603174KFKEA

46 1 R22 RES, CHIP, 107k 1% 0603 NIC NRC06F1073TRF



49 1 R29 RES, CHIP, 52.3k 1% 0603 VISHAY CRCW060352K3FKEA

50 0 R32 RES, CHIP, OPT 5% 1812 OPT

51 1 T3 XFMR, SMD GATE DRIVE, PE-68386NL PULSE PE-68386NL

52 0 T3 (ALTERNATE) XFMR, SMD GATE DRIVE, EPA4271GE PCA EPA4271GE

53 1 U3 IC, PoE IDEAL BRIDGE CONTROLLER, LT4321IUF QFN16 LINEAR TECH LT4321IUF#PBF

54 2 STENCIL (TOP AND BOTTOM) STENCIL DC2475A

DC2475A-A

1 DC2475A – GENERAL BOM

1 1 C2 CAP, CER, X5R 10µF 16V 10% 1206 MURATA GRM31CR61C106KA88

2 1 C3 CAP, CER, X5R 10µF 16V 10% 1206 MURATA GRM31CR61C106KA88

3 1 C4 CAP, ELEC, 33µF 25V 20% 5.0X5.8 PANASONIC EEHZA1E330R

4 1 C8 CAP, CER, U2J 470pF 630V 5% 1206 MURATA GRM31A7U2J471JW31D

5 1 C9 CAP, CER, U2J 100pF 630V 5% 1206 MURATA GRM31A7U2J101JW31D

6 1 C16 CAP, CER, X7R 1µF 25V 10% 0805 MURATA GRM21BR71E105KA99L

7 1 C22 CAP, CER, X7R 3.3nF 25V 10% 0603 AVX 06033C332KAT2A

8 1 C24 CAP, CER, X7R 0.1µF 25V 20% 0603 MURATA GRM188R71E104KA01D

9 1 C25 CAP, CER, X7R 220pF 25V 10% 0603 AVX 06033C221KAT4A

10 0 D18 DIODE, DIODE INC, OPT 40V SOD323 DIODE INC OPT

11 1 E11 TP, TURRET, PAD150-094 0.094" MILL-MAX 2501-2-00-80-00-00-07-0

12 1 L1 IND, 180nH COILCRAFT DO1813P-181HC

13 1 L3 IND, CMC, 1mH WURTH 744 272 102

PARTS LIST

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14 1 Q2 MOSFET, N-CH, 100V TSON TOSHIBA TPN1600ANH

15 0 Q3 MOSFET, N-CH, OPT SOT23 OPT

16 1 Q4 MOSFET, N-CH, 200V TDSON-8 INFINEON BSZ900N20NS3

17 1 R2 RES, CHIP, 1.5k 5% 0805 NIC NRC10J152TRF

18 1 R3 RES, CHIP, 200Ω 5% 1206 NIC NRC12F2000TRF

19 1 R4 RES, CHIP, 200Ω 5% 1206 NIC NRC12F2000TRF



22 1 R10 RES, CHIP, 6.65k 1% 0603 NIC NRC06F6651TRF


24 1 R14 RES, CHIP, 25mΩ 1% 1206 VISHAY WSL1206R0250FEA

25 1 R16 RES, CHIP, 0Ω, SHUNT, 0805 VISHAY CRCW08050000Z0EA

26 1 R19 RES, CHIP, 37.4Ω 1% 0805 VISHAY CRCW080537R4FKEA

27 1 R20 RES, CHIP, 1.00Ω 1% 0805 VISHAY CRCW08051K00FKEA



30 1 R25 RES, CHIP, 10k 5% 0603 YAGEO RC0603JR-0710KL

31 1 R26 RES, CHIP, 5.1k 5% 0603 YAGEO RC0603JR-075K1L


33 0 R31 RES, CHIP, SHUNT, 2512 OPT

34 1 T1 XFMR, FLYBACK TRAN, 750316115 WURTH 750316115

35 0 T1 (ALTERNATE) XFMR, FLYBACK TRAN, EPC3634G PCA EPC3634G

36 0 T2 XFMR, FLYBACK TRAN, OPT OPT

37 1 U1 IC, PD AND SWITCHER CONTROLLER, LT4295IUFD QFN28 LINEAR TECH LT4295IUFD

38 1 U2 IC, TRANSISTOR OUTPUT OPTOCOUPLER, SO-8 FAIRCHILD SEMI, MOC207M

39 4 MH1-MH4 STAND-OFF, NYLON 0.50" TALL (SNAP ON) KEYSTONE 8833

40 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2475A

PARTS LIST

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C2

47

5A

-A

SCH

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ATIC

DIA

GR

AM

5

5

4

4

3

3

2

2

1

1

D D

C C

B B

A A

VPORTP

T2P

-VOUT

+VOUT

VPORTN

___

GND

AUX+

AUX-

12V/3A

OPTIONAL COMPONENTS

37V-57V

37V-57V

+VOUT

+VOUT

VPORTP

+VOUT

VCC

VCC

VPORTP

VPORTN

REVISION HISTORYDESCRIPTION DATEAPPROVEDECO REV

KAUNG H.PRODUCTION1 2 3-3-2016





SIZE

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TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035Phone: (408)432-1900

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LTC Confidential-For Customer Use Only

CUSTOMER NOTICELINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN ACIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TOVERIFY PROPER AND RELIABLE OPERATION IN THE ACTUALAPPLICATION. COMPONENT SUBSTITUTION AND PRINTEDCIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUITPERFORMANCE OR RELIABILITY. CONTACT LINEARTECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE

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2

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HIGH EFFICIENCY IEEE802.3bt PD WITH PoE IDEAL DIODE BRIDGE

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N/ALT4295IUFD, LT4321IUFDEMO CIRCUIT 2475A-A

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D19PTVS58VS1UR

21

HSS

R31OPT2512

E12

1uFC16

080525V

R13

100

470pFC8

1206

R160

0805

R827

1206

T4

OPT

1

4

2

3

T1750316115

5

6

91

3

10

7

2

82.2uF100V1210X7R

C7

C5OPT

E9

R19

37.4

0805

R21.5K

R32OPT

OPTC27

04021uF

C17

D1B2100

2 1

0.047uF

C12

100V

E4

exposed pad, solder side

U1LT4295IUFD

VP

OR

T28

HS

GA

TE

26

HS

SR

C25

SW

VC

C23

DN

C22

VC

C21

VIN

24

PG

20

FB3114

ISEN-16

ISEN+17

SG

18

AUX2

RCLASS++3

RCLASS4

GN

D19

VC

C6

VC

C7

VC

C8

T2

P5

SF

ST

11

RL

DC

MP

15

VC

C9

GN

D1

ITHB13

FF

SD

LY

12

NC

27

RO

SC

10

GN

D_E

P29

R117.50K

PE-68386NL

T31

3

6

4

E3

D16PTVS58VS1UR

21

100pFC26

25V0402

100uH

L4DO1608C-104

U2MOC2071 7

2

6

5

D13

BAT46WJ,115

12

R2952.3K

220pF

C25

10uHL2

CoilcraftDO1608C-103

L3

1mH744272102

1 2

34

OPTC1

R12

0

+10uF100V6.3x7.7

C6

R1425m1206

E2

E10

R58.20805

C10

10nF0603100V

R17

2.00K

R22

107K

MMBT3906

Q5

1

23OPTC15

E1

R7200805

180nHL1

COILCRAFTDO1813P-181HC

R32001206

Q2TPN1600ANH

6

4

58 7123

4.7nFC23

2KV

R15

15

OPTC21

Q3OPT

3

1

2

Q1PSMN075-100MSE

6

4

5

87

123

0.1uFC24

R25

10K

R4

2001206

D18

OPT

21

R30OPT

0805

R24

26.1K

E11

Q7FMMT723A

32

1

R20

1.00K

0805

R18

10K

+C433uF25V

EEHZA1E330R

D15

BAV19WS

21

OPTC19

C310uFX5R16V1206

R27

00402

T2

*

4

6

71

3

8

5

2

R927

1206

3.3nF

C22

R26

5.1K

2.2nF

C20

C2

X5R16V1206

10uF

D4LED

R21174K

Q4BSZ900N20NS3

6

4

5 871 2 3

100pF

C9

1206

MMBT3904

Q6

1

2 3

D17

PMEG1020EA

21

OPTC18

10uF

C13

10V1206

R63.3K

R106.65K

R23

OPT

VSEC_P

VPRI_SG

VAUX_P

SG

VPRI_SW

PG

VPRI_P

VAUX_P

VSEC_SW

VSEC_SW

VSEC_P

VPRI_SW

VSEC_P

VPRI_P

PGVPRI_SG VSEC_SG

VSEC_SG

VAUX_P VSEC_P

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Information furnished by Linear Technology C

orporation is believed to be accurate and reliable. H

owever, no responsibility is assum

ed for its use. Linear Technology Corporation m

akes no representa-tion that the interconnection of its circuits as described herein w

ill not infringe on existing patent rights.

SCH

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ATIC

DIA

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4

3

3

2

2

1

1

D D

C C

B B

A A

OUT

TO

PHY

IN FROM

PoE+

PSE

PoE IDEAL DIODE BRIDGE

VPORTN

VPORTP







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RT475

Q16

PSMN075-100MSE

6

4

58 7123

J2

SS-6488S-A-NF

12345678

910

Q18

PSMN075-100MSE

6

4

58 7123

R28

0

Q15

PSMN075-100MSE

6

4

58 7123

Q17

PSMN075-100MSE

6

4

58 7123

C110.047uF100V

DATA2-1

CG1

1000pF18082KV

RT375

Q14

PSMN075-100MSE

6

4

58 7123

DATA1-1

D3MMSZ5252BS24V

21

Q13

PSMN075-100MSE

6

4

58 7123

Q12

PSMN075-100MSE

6

4

58 7123

Q11

PSMN075-100MSE

6

4

58 7123

CG20.01uF100V1206

EP

U3LT4321IUF

TG361

IN362

IN453

TG454

TG

78

5

IN78

6

BG

78

7

BG

45

8

OUTP12

EN11

EN10

OUTN9

TG

12

16

IN12

15

BG

12

14

BG

36

13

17OUTN

DATA2-2

RT175

RT275

1

2

3

6

4

5

7

8

4 X 12nF

4 X 75 Ohms

1nF 2kV

J1

7499511001A

TRD1+11

TRCT112

TRD1-10

TRD2+4

TRCT26

TRD2-5

TRD3+3

TRCT31

TRD3-2

TRD4+8

TRCT47

TRD4-9

VC214VC113

VC315

VC416

SHIELD17 SHIELD18

D2PTVS58VS1UR

21

DATA1-2

DATA2-1

DATA2-2

DATA1-1

DATA1-2

BG

12

BG

36

DATA1-2

TG36

TG45

DATA2-1DATA1-1 DATA2-2

TG12

BG45

TG45

BG36

TG36

BG12

TG78

BG78

VPORTN

BG

78

DA

TA

2-2

TG

78

DATA2-1

DA

TA

1-1

DATA1-2

TG

12

BG

45

VPORTN

VPORTP

12

dc2475aafa


Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com © LINEAR TECHNOLOGY CORPORATION 2016

LT 1216 REV A • 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

Copyright © 2004, Linear Technology Corporation

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