DEMO MANUAL DC2046A-A LT4276, LT4321 PoE PD with Synchronous Flyback and Ideal Diode Bridge Description Demonstration circuit 2046A-A is a PoE powered device (PD) with an isolated power supply using synchronous flyback topology, featuring the LT®4276 and ideal diode bridge controller (LT4321). The LT4276 provides IEEE802.3af (PoE, Type 1), IEEE802.3at (PoE+, Type 2), and LTPoE++™ PD interfacing and power supply control. When the PD is fully powered, the PD interface switches power over from the power sourcing equipment (PSE) to the switcher through an external, low resistance, high power N-channel FET. The highly integrated LT4276 controls a high power, smallsized power supply that utilizes a highly efficient flyback Performance Summary topology with synchronous rectification. The LT4321 provides further efficiency improvement by minimizing the bridge losses. The DC2046A-A supplies a 3.3V output at up to 6.8A. It also demonstrates the use of an optional auxiliary power supply input of 48V. When present, the auxiliary supply becomes the dominant supply over PoE to provide power. Design files for this circuit board are available at http://www.linear.com/demo/DC2046A-A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTPoE++ is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C PARAMETER CONDITIONS VALUE Port Voltage (VPORT) At Ethernet Port 37V to 57V Auxiliary Voltage From AUX+ to AUX– Terminals 37V to 57V Output Voltage 3.3V (Typ) Output Current 6.8A (Max) VPORT = 42.5V, IOUT = 6.8A Output Voltage Ripple 25mVP-P (Typ) Output Regulation ±0.15% (Typ) VPORT = 50V, IOUT = 6.8A, End to End Efficiency 90% (Typ) Switching Frequency 250kHz (Typ) Board Photos Top Side Bottom Side dc2046aaf 1 DEMO MANUAL DC2046A-A Typical Performance Characteristics Top Side Bottom Side Figure 1. Thermal Pictures, VPORT = 57V, IOUT = 6.8A 92 3.6 90 88 3.5 84 VOUT (V) EFFICIENCY (%) 86 82 80 3.4 3.3 78 76 72 0.7 3.2 VPORT = 42.5V VPORT = 50V VPORT = 57V 74 1.4 2.1 2.8 3.5 4.2 4.9 LOAD CURRENT (A) 5.6 6.3 7 dc2047a F02 Figure 2. Efficiency (End to End) 3.1 0.7 VPORT = 42.5V VPORT = 50V VPORT = 57V 1.4 2.1 2.8 3.5 4.2 4.9 LOAD CURRENT (A) 5.6 6.3 7 dc2047a F03 Figure 3. Output Voltage Regulation dc2046aaf 2 DEMO MANUAL DC2046A-A Typical Performance Characteristics Figure 4. Stresses (VPORT = 57V, 3.3V/ 6.8A) Figure 5. Output Voltage Ripple (VPORT = 42.5V, 3.3V/6.8A) Figure 6. Load Transient Response (VPORT = 42.5V, 3.8A to 6.8A to 3.8A) Figure 7. Gain and Phase Margin of the Flyback Loop (VPORT = 42.5V, 3.3V/0.7A) dc2046aaf 3 DEMO MANUAL DC2046A-A Quick Start Procedure Demonstration circuit 2046A-A is easy to set up to evaluate the performance of the LT4276 in a PoE+ application. Refer to Figure 8 for proper 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 output voltage ripple by touching the probe tip and probe ground directly across the +VOUT and –VOUT terminals. See Figure 9 for proper scope probe technique. 1. Place test equipment (voltmeter, ammeter, power supplies, and electronic load) as shown in Figure 8. b. Or, connect a 37V to 57V capable power supply (power supply in Figure 8) across VPORTP and VPORTN. c. If evaluating the auxiliary power supply (auxiliary supply in Figure 8), connect a 37V to 57V capable power supply across AUX+ to AUX–. 3. Check for the proper output voltage of 3.3V. 4. Once the proper output voltage is confirmed, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency, and other parameters. 2. Input supplies: a. Connect a PoE+ capable PSE with a CAT-5 cable to the RJ45 connector, J1. See Figure 8. DC1366A PoE+ PSE Ethernet Cable + V - J1 + Scope Probe + Power Supply - - Electronic Load + A - + V - A+ + V + Auxiliary Supply Figure 8. Proper Measurement Equipment Setup Figure 9. Measurement Input or Output Ripple dc2046aaf 4 DEMO MANUAL DC2046A-A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Cap, Cer, X7R 1000pF 2kV 10% 1808 Murata GR442QR73D102KW01L DC2046A General BOM 1 1 CG1 2 1 CG2 Cap, Cer, X7R 0.01µF 100V 20% 1206 AVX 12061C103AT2A 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 10% 1812 Murata GR443DR73D472KW01L 15 1 C26 Cap, Cer, X5R 100pF 16V 10% 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 Diodes Inc BAV19WS 23 1 D16 Diode, TVS, PTVS58VS1UR 58V SOD123 NXP PTVS58VS1UR 24 1 D17 Diode, Schottky, BAT54WS 30V SOD323 Diodes Inc BAT54WS 25 1 D19 Diode, TVS, PTVS58VS1UR 58V SOD123 NXP PTVS58VS1UR 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 Würth 7499511001 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 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 Transistor, PNP, FMMT723 100V SOT23 Diodes Inc FMMT723TA 34 0 Q7 (Alternate) Transistor, PNP, PBSS9110T 100V SOT23 NXP PBSS9110T 35 4 RT1, RT2, RT3, RT4 Res, Chip, 75 5% 0603 NIC NRC06J750TRF dc2046aaf 5 DEMO MANUAL DC2046A-A Parts List ITEM QTY 36 1 REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R5 Res, Chip, 8.2 5% 0805 NIC NRC10J8R2TRF 37 1 R6 Res, Chip, 3.3K 5% 0603 NIC NRC06J332TRF 38 1 R7 Res, Chip, 20Ω 5% 0805 VISHAY CRCW080520R0JNEA 39 1 R12 Res, Chip, 0 5% 0603 NIC NRC06ZOTRF 40 1 R13 Res, Chip, 100 5% 0603 VISHAY CRCW0603100RFKEA 41 1 R15 Res, Chip, 15 5% 0603 NIC NRC06J150TRF 42 1 R17 Res, Chip, 2k 1% 0603 NIC NRC06F2001TRF 43 1 R18 Res, Chip, 10k 5% 0603 YAGEO RC0603JR-0710KL 44 1 R21 Res, Chip, 174k 1% 0603 VISHAY CRCW0603174KFKEA 45 1 R22 Res, Chip, 107k 1% 0603 NIC NRC06F1073TRF 46 1 R27 Res, Chip, 0 5% 0402 NIC NRC04ZOTRF 47 1 R28 Res, Chip, 0 5% 0603 NIC NRC06ZOTRF 48 1 R29 Res, Chip, 52.3k 1% 0603 VISHAY CRCW060352K3FKEA 49 0 R32 Res, Chip, OPT 5% 1812 OPT 50 1 T3 XFMR, SMD Gate Drive, PE-68386NL PULSE PE-68386NL 50 0 T3 (Alternate) XFMR, SMD Gate Drive, EPA4271GE PCA EPA4271GE 51 0 T4 XFMR, SMD Gate Drive, OPT OPT 52 1 U3 IC, PoE Ideal Bridge Controller, LT4321IUF QFN16 LINEAR TECHNOLOGY LT4321IUF DC2046A-A BOM 1 1 C2 Cap, Cer, X7R 22µF 6.3V 10% 1206 Murata GRM31CR70J226KE19 2 1 C3 Cap, Cer, X7R 22µF 6.3V 10% 1206 Murata GRM31CR70J226KE20 3 1 C4 Cap, Elec, 68µF 4V 20% 5.0X5.3 Panasonic 4SVPA68MAA 4 1 C8 Cap, Cer, U2J 1nF 630V 5% 1206 Murata GRM31A7U2J222JW31 5 1 C9 Cap, Cer, U2J 100pF 630V 5% 1206 Murata GRM31A7U2J101JW31 6 1 C16 Cap, Cer, X7R 1µF 25V 10% 0805 Murata GRM21BR71E105KA99L 7 1 C22 Cap, Cer, X7R 4.7nF 25V 10% 0603 Murata GRM18871E472KA01D 8 1 C24 Cap, Cer, X7R 0.1µF 25V 20% 0603 Murata GRM188R71E104KA01D 9 1 C25 Cap, Cer, X7R 470pF 25V 5% 0603 AVX 06033A471JAT2A 10 1 D18 Diode, Diode Inc, B0540WS-7 40V SOD323 Diode Inc B0540WS-7 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, 3.3mH Würth 744 272 332 13 0 L3 (Alternate) IND, CMC, 3.3mH PCA EPA4411 14 1 Q2 MOSFET, N-CH, PSMN2R4-30MLD 30V LFPAK33 NXP PSMN2R4-30MLD 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, 360 5% 0805 NIC NRC10J381TRF 18 1 R3 Res, Chip, 200 5% 1206 Vishay CRCW1206200RFKEA 19 1 R4 Res, Chip, 200 5% 1206 Vishay CRCW1206200RFKEA 20 1 R8 Res, Chip, 5.1 5% 1206 NIC NRC12J5R1TRF dc2046aaf 6 DEMO MANUAL DC2046A-A Parts List ITEM QTY 21 0 REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R9 Res, Chip, OPT 5% 1206 OPT 22 1 R10 Res, Chip, 6.49k 1% 0603 Vishay CRCW06036K49FKEA 23 1 R11 Res, Chip, 6.81k 1% 0603 Vishay CRCW06036K81FKEA 24 1 R14 Res, Chip, 40m 1% 1206 Vishay WSL1206R0400FEA 25 0 R16 Res, Chip, OPT, Shunt, 0805 OPT 26 0 R19 Res, Chip, OPT 1% 0805 OPT 27 1 R20 Res, Chip, 35.7Ω 1% 0805 Vishay CRCW080535R7FKEA 28 0 R23 Res, Chip, OPT 5% 0603 OPT 29 1 R24 Res, Chip, 8.25k 1% 0603 Vishay CRCW06038K25FKEA 30 1 R25 Res, Chip, 47k 5% 0603 NIC NRC06J473TRF 31 1 R26 Res, Chip, 10k 5% 0603 YAGEO RC0603JR-0710KL 32 1 R30 Res, Chip, 47Ω 5% 0805 Vishay CRCW080547R0JNEA 33 0 R31 Res, Chip, OPT, Shunt, 2512 OPT 34 1 T1 XFMR, Flyback Tran, 750310743 Würth 750310743 34 0 T1 (Alternate) XFMR, Flyback Tran, EPC3408G PCA EPC3408G 35 0 T2 XFMR, Flyback Tran, OPT OPT 36 1 U1 IC, PD & Switcher Controller, LT4276BIUFD QFN28 Linear Technology LT4276BIUFD 37 1 U2 38 1 OPTO, MOC207 SO8 Fairchild MOC207M FAB, Printrd Circuit Board Demo Circuit 2046A dc2046aaf 7 A B C D REV 4 E4 VAUX_P AUX- GND VPORTN VPORTN 5 R32 OPT E10 E12 E9 37V-57V VPORTP VPORTP VPORTP DATE 4 1 3.3mH 744272332 L3 1-7-2015 3 2 2 VPRI_SW3 VPRI_P 4 T2 * 6 5 8 7 VSEC_SW VSEC_P OPTIONAL COMPONENTS C21 OPT C19 OPT VSEC_P VAUX_P 1 37V-57V E1 KAUNG H. PRODUCTION AUX+ APPROVED DESCRIPTION R29 52.3K R21 174K C26 100pF 0402 25V 0.047uF 100V C12 D1 B2100 1 Q1 PSMN075-100MSE 3 2 1 R5 8.2 0805 8 7 6 5 4 3 OPT T4 4 1 VSEC_SG ASSEMBLY VERSION DC2046A-A DC2046A-B DC2046A-C DC2046A-D DC2046A-E DC2046A-F VPRI_SG2 C18 OPT C15 OPT 2 OUTPUT 3.3V/6.8A 5V/4.7A 12V/1.9A 24V/0.95A 5V/7A 5V/2.3A R17 2.00K RCLASS RCLASS++ AUX FB31 D17 BAT54WS U1 LT4276BIUFD LT4276BIUFD LT4276BIUFD LT4276BIUFD LT4276AIUFD LT4276CIUFD R20 35.7 0805 R19 4 3 2 14 U1 LT4276BIUFD R10 6.49K 10uF 100V 6.3x7.7 Coilcraft DO1608C-103 +C6 L2 10uH HSS OPT 0805 PG D16 PTVS58VS1UR C10 10nF 0603 100V R6 3.3K 4 1 1 2 ECO 4 28 VPORT 26 HSGATE 3 Q7 FMMT723 R11 6.81K VCC L4 DO1608C-104 C13 100uH 10uF 1206 10V C7 2.2uF 100V 1210 X7R 3 2 3 1 2 D15 BAV19WS 1 R7 20 0805 exposed pad, solder side 107K R22 ITHB ISEN- ISEN+ SG OPT R23 13 16 17 R27 0402 0 8.25K R24 4.7nF C22 C27 OPT 0402 4 3 T3 10K R26 470pF C25 1uF C17 1 VPRI_SG 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. C23 4.7nF 2KV 5 7 6 SCALE = NONE 2 C20 2.2nF R8 5.1 1206 C8 1nF 1206 D13 2 BAT46WJ,115 3 Q5 MMBT3906 4 3 47K R25 1 E2 T2P ___ E3 D4 LED R2 360 -VOUT 3.3V/6.8A +VOUT DATE: N/A SIZE DEMO CIRCUIT 2046A-A 1 SHEET 1 LT4276BIUFD, LT4321IUF Wednesday, April 01, 2015 IC NO. 4 OF 2 REV. HIGH EFFICIENCY POE PD INTERFACE WITH INTEGRATED SWITCHING REGULATOR 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E11 C16 1uF 0805 25V R16 OPT 0805 +VOUT +VOUT R30 47 0805 TECHNOLOGY 10K R18 15 R15 2 C5 OPT +VOUT D18 B0540WS-7 68uF 4V 4SVPA68MAA +C4 Q6 MMBT3904 Q2 PSMN2R4-30MLD C3 22uF X7R 6.3V 1206 L1 180nH COILCRAFT DO1813P-181HC R31 OPT 2512 TITLE: SCHEMATIC 6VSEC_SG 4 C2 22uF X7R 6.3V 1206 VSEC_P VSEC_SW APPROVALS U2 MOC207 1 3 PE-68386NL R14 40m 1206 100 R13 R9 OPT 1206 6 7 8 10 9 5 1 Q4 BSZ900N20NS3 VPRI_SW R4 200 1206 VAUX_P C9 100pF 1206 R3 200 1206 CUSTOMER NOTICE C24 0.1uF R12 0 OPT 1 Q3 D19 PTVS58VS1UR VPRI_P T1 750310743 C1 OPT 2 2 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. K. HTOO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. K. HTOO APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. VCC 1 20 PG 5 1 2 T2P 5 VCC VCC VCC VCC 6 7 8 9 NC DNC GND GND_EP GND 27 22 19 29 1 25 HSSRC 12 FFSDLY 21 VCC 23 SWVCC SFST 11 3 2 2 18 SG 24 PG VIN ROSC 10 RLDCMP 15 1 5 6 7 8 1 2 3 8 7 6 5 3 2 1 1 2 2 1 8 1 REVISION HISTORY A B C D DEMO MANUAL DC2046A-A Schematic Diagram dc2046aaf 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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. A B C D IN FROM PoE+ PSE CG2 0.01uF 100V 1206 J1 SHIELD SHIELD 5 Q12 DATA1-1 Q11 7499511001 18 17 8 7 5 4 6 3 2 Q14 PSMN075-100MSE 4BG12 Q13 DATA1-2 PSMN075-100MSE 4TG12 1nF 2kV TRD1- 11 4TG36 13 14 15 16 9 7 8 2 1 3 5 6 4 10 12 Q15 Q16 DATA2-1 4 PSMN075-100MSE 4BG36 DATA1-1 DATA1-2 DATA2-1 DATA2-2 DATA1-1 DATA1-2 DATA2-1 DATA2-2 RT1 75 RT3 75 CG1 1000pF 1808 2KV RT2 75 RT4 75 1 2 3 4 5 6 7 8 SS-6488S-A-NF J2 3 4BG45 PSMN075-100MSE Q18 DATA2-2 PSMN075-100MSE 4TG45 Q17 PSMN075-100MSE 4BG78 PSMN075-100MSE 4TG78 3 VPORTN VPORTP 3 4 TG45 TG45 IN45 IN36 TG36 OUT TO PHY EP 9 17 10 11 VPORTP VPORTN CUSTOMER NOTICE OUTN OUTN EN EN OUTP 12 0 R28 APPROVALS D3 MMSZ5252BS 24V 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 SCALE = NONE LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES. K. HTOO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. K. HTOO APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 2 DATA2-1 1 DATA1-2 TG36 U3 LT4321IUF PoE IDEAL DIODE BRIDGE PSMN075-100MSE VC1 VC2 VC3 VC4 TRD4- TRCT4 TRD4+ TRD3- TRCT3 TRD3+ TRD2- TRCT2 TRD2+ 4 X 75 Ohms 4 X 12nF TRD1+ TRCT1 8 7 6 5 9 10 1 8 7 6 5 3 2 1 8 7 6 5 3 2 1 8 7 6 5 3 2 1 8 7 6 5 3 2 1 3 2 1 8 7 6 5 3 2 1 4 5 8 7 6 5 BG12 TG78 3 2 1 8 7 6 5 3 2 1 TG12 16 DATA1-1 15 IN12 TG12 TG78 6 IN78 BG36 13 BG36 DATA2-2 1 2 14 BG12 BG78 7 BG78 BG45 8 BG45 DESCRIPTION DATE 1-7-2015 APPROVED KAUNG H. DATE: N/A SIZE DEMO CIRCUIT 2046A-A 1 SHEET 2 LT4276BIUFD, LT4321IUF Tuesday, March 31, 2015 IC NO. 4 OF 2 REV. HIGH EFFICIENCY POE PD INTERFACE WITH INTEGRATED SWITCHING REGULATOR 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only PRODUCTION 1 REVISION HISTORY TECHNOLOGY D2 PTVS58VS1UR 4 REV TITLE: SCHEMATIC C11 0.047uF 100V 1 ECO 1 2 5 A B C D DEMO MANUAL DC2046A-A Schematic Diagram dc2046aaf 9 DEMO MANUAL DC2046A-A 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 dc2046aaf 10 Linear Technology Corporation LT 0515• PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015