DEMO MANUAL DC2253A LTC3789EGN 300W 2-Phase Interleaved Synchronous Buck-Boost Converter Description Demonstration circuit 2253A is a high power, high efficiency, 2-phase interleaved synchronous buck-boost converter with a 6V to 36V input range. It can supply a 25A maximum load current with a 12V output. This demo board features 2x LTC3789EGN controllers. The LTC®3789 is a high performance current-mode buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage, while an output current feedback loop provides support for output current limit and battery charging. With a wide 4V to 38V (40V maximum) input and output range and seamless, low noise transitions between operating regions, the LTC3789 is ideal for automotive, telecom and battery-powered systems. Performance Summary PARAMETER The light load operating mode of the controller is determined through the MODE/PLLIN pin. By default, the forced continuous mode (CCM) operation is pre-selected on this demo board. Switching frequency is preset at about 200kHz. Two paralleling schemes are available for this demo board and by default the method of shared ITH pins is adopted. Please refer to the Quick Start Procedure section for the optional Master-Slave paralleling scheme. To shut down the converter, force the RUN pin below 1.2V (JP1: OFF) Please refer to LTC3789 data sheet for more detailed information. Design files for this circuit board are available at http://www.linear.com/demo/DC2253A L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25°C CONDITION Input Voltage Range 6V to 36V Output Voltage, VOUT VIN = 6V to 36V, IOUT = 0A to 25A Maximum Output Current, IOUT VIN = 6V to 36V, VOUT = 12V Typical Output Ripple VIN = 36V, IOUT = 25A (20MHz BW) VIN = 12V, IOUT = 25A (20MHz BW) VIN = 6V, IOUT = 25A (20MHz BW) Typical Efficiency VIN = 12V, VOUT = 12V, IOUT = 25A, see Figure 3 Typical Switching Frequency VALUE 12V ±2% 25A 36mVP-P 200mVP-P 380mVP-P 97.8% 200kHz dc2253af 1 DEMO MANUAL DC2253A Quick Start Procedure Demonstration circuit 2253A is easy to set up to evaluate the performance of the LTC3789EGN. Refer to Figure 1 for the proper measurement equipment setup and follow the procedure below: 1.With power off, connect the input power supply to VIN (6V to 36V) and GND (input return). 2.Connect the 12V output load between VOUT and GND (Initial load: no load). 3.Connect the DVMs to the input and output. Set the default jumper position, JP1: ON. 4.Turn on the input power supply and check for the proper output voltages. VOUT should be 12V ±2%. 5.Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage and other parameters. Optional Master-Slave Paralleling Scheme Besides the default paralleling scheme by tying the ITH pins together, another optional Master-Slave scheme can be achieved on the demo board to obtain a better sharing of the inductor currents and output currents between phases. Please refer to the schematic in Page 8. To implement it, 1.Remove R67, R69 and R70. 2.Populate R68, R71 with 0Ω. 3.Set RFB3 5~10% higher than RFB1 and set RFB4 = RFB2. 4.Choose the current reference divider R65 and R66 so that when the Vout is regulated, the voltage drop on R65 is equal to VILIM, where VILIM is the output current limit threshold voltage. For example, when ILIM pin is grounded, VILIM = 50mV. For VOUT = 12V, select R65 = 100Ω and R66 = 24kΩ and then the voltage drop on R65 will be 50mV. Note: When measuring the output or input voltage ripple, do not use the long ground lead on the oscilloscope probe. See Figure 2 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead. 2 dc2253af DEMO MANUAL DC2253A Quick Start Procedure Figure 1. Proper Measurement Equipment Setup + VOUT – COUT GND Figure 2. Measuring Output Voltage Ripple dc2253af 3 DEMO MANUAL DC2253A Quick Start Procedure 100 14 EFFICIENCY (%) 96 94 92 90 88 86 84 36VIN 12VIN 6VIN 82 80 0 5 10 15 20 LOAD CURRENT (A) 25 PHASE OUTPUT CURRENT (A) 98 ±2% 12 10 8 6 4 2 0 30 0 5 10 15 20 TOTAL OUTPUT CURRENT (A) DC2253A F04 DC2253A F03 Figure 3. Efficiency vs Load Current (VOUT = 12V, CCM) 14 ±1.4% 12 10 8 6 4 2 0 ±3.7% 12 10 8 6 4 2 0 5 10 15 20 TOTAL OUTPUT CURRENT (A) 25 DC2253A F05 Figure 5. Output Current Sharing (VIN = 12V, VOUT = 12V) 4 Figure 4. Output Current Sharing (VIN = 6V, VOUT = 12V) PHASE OUTPUT CURRENT (A) PHASE OUTPUT CURRENT (A) 14 25 0 0 5 10 15 20 TOTAL OUTPUT CURRENT (A) 25 DC2253A F06 Figure 6. Output Current Sharing (VIN = 36V, VOUT = 12V) dc2253af DEMO MANUAL DC2253A Quick Start Procedure Figure 7. Thermal Performance (VIN = 12V, VOUT = 12V, 25A Load, No Air Flow) Figure 8. Thermal Performance (VIN = 6V, VOUT = 12V, 25A Load, 200LFM) dc2253af 5 DEMO MANUAL DC2253A Quick Start Procedure Figure 9. Thermal Performance (VIN = 36V, VOUT = 12V, 25A Load, 200LFM) 6 dc2253af DEMO MANUAL DC2253A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 2 2 CC1, CC4 CAP., C0G, 100pF, 50V, 10% 0603 AVX, 06035A101KAT2A 2 CC2, CC3 CAP., X7R, 0.01µF, 50V, 10% 0603 AVX, 06035C103KAT2A 3 5 CSS1, C15, C39, C61, CSS CAP., X7R, 0.1µF, 50V, 10% 0603 AVX, 06035C104KAT2A 4 0 CF1, CF2, CF3, C7, C8, CF, C23 CAP., 0603 OPTIONAL 5 C29, C30, C31-C34 6 C12, C13, C59, C60 CAP., 1206 OPTIONAL 7 C14, C35, C36, C41, C46-C50 CAP., 1210 OPTIONAL 8 4 C62, C63, C66, C67 CAP., X7R, 2.2µF, 50V, 10% 1206 KEMET C1206C225K5RACTU 9 4 C64, C65, C68, C69 CAP., X7R, 2.2µF, 25V, 10% 1206 AVX 12063C225KAT2A 10 2 C11, C51 CAP., NPO, 68pF, 50V, 10% 0603 AVX, 06035A680KAT2A 11 2 C10, C38 CAP., X5R, 4.7µF, 10V, 10% 0603 AVX, 0603ZD475KAT2A 12 2 C24, C55 CAP., X7R, 1µF, 16V, 20% 0603 AVX, 0603YC105MAT2A 13 4 CIN1, CIN2, CIN3, CIN4 CAP., ALUM, 270µF, 50V, 20% SUN ELECTRONICS, 50ME270WX+T 14 4 COUT1, COUT2, COUT3, COUT4 CAP., OS-CON, 330µF, 25V, 20% SANYO, 25SEPF330M 15 12 C16, C17, C19, C20, C21, C28 CAP., X7R, 22µF, 16V, 20% 1210 AVX, 1210YC226MAT2A 16 C40, C42, C43, C44, C53, C58 17 4 C4, C5, C22, C52 CAP., X7R, 0.22µF, 16V, 20% 0603 AVX, 0603YC224MAT2A 18 8 C9, C25, C26, C27 CAP., X7R, 3.3µF, 50V, 20% 1210 AVX, 12105C335MAT2A 19 C37, C45, C54, C56 20 2 C18, C57 CAP., X5R, 10µF, 6.3V, 20% 1206 AVX, 12066D106MAT2A 21 4 D4, D7, D12, D13 DIODE, SCHOTTKY 1A 60V POWERDI123 DIODE INC., DFLS160-7 22 4 D5, D6, D10, D11 DIODE, SCHOTTKY 3A 40V SMA DIODE INC., B340A-13-F 23 1 D8 DIODE, ZENER 5.1V 350MW SOT23-3 DIODE INC., BZX84C5V1-7-F 24 1 JP1 HEADER, 3 PIN 0.079 SINGLE ROW SAMTEC, TMM-103-02-L-S 25 1 XJP1 SHUNT, .079" CENTER SAMTEC, 2SN-BK-G 26 4 J2, J4, J5, J6 STUD, TESTPIN PEM KFH-032-10 27 8 J1, J2, J3, J4 (x2) NUT, BRASS 10-32 ANY #10-32 28 4 J1, J2, J3, J4 RING, LUG #10 KEYSTONE, 8205, #10 29 4 J1, J2, J3, J4 WASHER, TIN PLATED BRASS ANY #10, #10EXT BZ TN 30 2 L1, L2 INDUCTOR, 3µH COILCRAFT LNC. XAL1580-302ME 31 6 Q2, Q4, Q6, Q16, Q17, Q12 MOSFET N-CHANNEL INFINEON, BSC027N04LS MOSFET N-CHANNEL INFINEON, BSC010NE2LS 32 6 Q3, Q5, Q10, Q15, Q9, Q14 33 0 Q7, Q8, Q11, Q13 OPT 34 1 RFB1 RES., CHIP., 113k, 0.1W, 1% 0603 YAGEO, RC0603FR-07113KL 35 1 RFB2 RES., CHIP., 8.06k, 0.1W, 1% 0603 YAGEO, RC0603FR-078K06L 36 4 R18, R32, R35, R64 RES., CHIP., 0.006Ω, 2W, 1% 2512 SUSUMU., KRL3264E-C-R006 37 2 R2, R59 Sense RES 0.003Ω 1W 1% 2512 SMD YAGEO, PR2512FKF070R003L 38 12 R3, R4, R9, R10, R13, R14, R36 RES., CHIP., 100Ω, 0.1W, 1% 0603 YAGEO, RC0603FR-07100RL YAGEO, RC0805JR-075R1L 39 R37, R40, R41, R53, R54 40 2 R5, R58 RES., CHIP, 5.1Ω, 0.1W, 5% 0805 41 0 R6, R12, R15, R22, R28, R29, R38, R39 RES., 0603, OPTIONAL 42 R63, R68, R71, R74, R75, R65, R66, R73 dc2253af 7 DEMO MANUAL DC2253A Parts List ITEM QTY REFERENCE PART DESCRIPTION 43 RFB3, RFB4 44 R28, R29, R60, R61 RES., 1206, OPTIONAL MANUFACTURER/PART NUMBER 45 2 R7, R50 RES., CHIP., 100k, 0.1W, 1% 0603 YAGEO, RC0603FR-07100KL 46 1 R8 RES., CHIP., 10Ω, 0.1W, 5% 0603 YAGEO, RC0603JR-0710RL 47 2 R26, R55 RES., CHIP., 10Ω, 0.1W, 5% 0805 YAGEO, RC0805JR-0710RL 48 17 R1, R11, R17, R23, R25 RES., CHIP., 0Ω 1% 0603 YAGEO, RC0603FR-070RL 49 R27, R43, R46, R48, R51, R76 50 R57, R62, R67, R69, R70, R72 51 1 R20, R33 RES., CHIP., 0Ω 2512 TEPRO, RN5326 52 2 R16, R45 RES., CHIP., 1k, 0.1W, 1% 0603 YAGEO, RC0603FR-071KL 53 6 RC1, R21, R24, R34, R44, RC RES., CHIP., 10k, 0.1W, 1% 0603 YAGEO, RC0603FR-0710KL 54 1 R30 RES., CHIP., 41.2k, 0.1W, 1% 0603 YAGEO, RC0603FR-0741K2L 55 1 R31 RES., CHIP., 12.1k, 0.1W, 1% 0603 YAGEO, RC0603FR-0712K1L 56 1 R56 RES., CHIP., 499k, 0.1W, 1% 0603 YAGEO, RC0603FR-07499KL 57 5 TP1, TP2, TP3, TP7, TP20 TESTPOINT, TURRET, .061" PBF MILL-MAX, 2308-2-00-80-00-00-07-0 58 6 TP4, TP5, TP6, TP10-TP12 TESTPOINT, TURRET, .094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0 59 2 U1, U2 I.C.,LTC3789EGN SSOP N LINEAR TECH., LTC3789EGN#PBF 60 1 U3 I.C.,LTC6908CDCB-1 2mm × 3mm LINEAR TECH., LTC6908CDCB-1 MTGS AT 4 CORNERS 61 4 62 1 63 2 8 STENCILS STAND-OFF, NYLON 0.5" KEYSTONE, 8833 (SNAP ON) FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT FT228A STENCIL BOTH SIDES STENCIL FT228A dc2253af A B C D TP6 TP5 CSS 0.1uF TP11 TP4 SS EXTVCC1 PLLIN1 OFF TP12 TP10 PLLIN1 3 5 R25 0 R22 OPT INTVCC1 RUN CC2 100 OPT VIN1+ VOUT R14 100 OPT C8 0.01uF C7 R10 R9 RC 10K R21 10K 2. INSTALL SHUNTS AS SHOWN. 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 4 4.7uF C10 0805 14 13 12 11 10 9 8 7 6 5 3 2 1 C11 68pF 4 CC1 100pF R13 100 100 VFB1 NOTE: UNLESS OTHERWISE SPECIFIED R24 10K R75 OPT INTVCC1 EXTVCC R16 1K R31 12.1K 41.2K OPT CF OPT VOS+ ITH1 RFB1 113K D8 BZX84C5V1 R15 CF1 OPT RFB2 8.06K JP1 VIN1+ RUN 1 R30 ON 2 ITH1 SS SGND PGOOD1 R7 100K INTVCC1 4 U1 IOSENSE- IOSENSE+ ILIM VOUTSNS VINSNS RUN FREQ MODE/PLLIN SGND ITH SENSE1- SENSE1+ SS VFB TRIM SW2 TG2 BOOST2 BG2 EXTVCC INTVCC VIN BG1 PGND BOOST1 TG1 SW1 PGOOD LTC3789EGN R3 100 15 16 17 18 19 20 21 22 23 24 25 26 27 28 0 R4 100 0805 R26 10 16V C24 1uF G VIN1+ C22 0.22uF 16V R6 OPT 3 R12 OPT R18 0.006 2W 6.3V D7 DFLS160 R1 0 C18 10uF G Q4 BSC027N04LS Q7 (OPT) C4 0.22uF 16V VOUT INTVCC1 D4 DFLS160 R27 0 R11 R23 0 R17 0 5.1 R5 Q2 Q6 BSC027N04LS C15 0.1uF 50V 3 D S D S R32 0.006 2W D5 B340A C12 (OPT) 1206 R28 (OPT) 1206 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE R29 (OPT) C13 (OPT) R66 (OPT) Jeoffrey W. SCALE = NONE APP ENG. HZ __ ECO 1 330uF 25V + COUT2 VOUT CIN2 270uF 50V + VOUT GND GND 6V - 36V VIN VIN1+ J4 TP1 TP2 GND VOS- VOS+ 12V @ 25A MAX R8 10 VOS+ J3 J2 TP7 J1 TP3 DATE CHARLIE Z. 6-9-11 APPROVED DATE: N/A SIZE 1 SHEET 1 LTC3789EGN DEMO CIRCUIT 2253A Wednesday, September 03, 2014 IC NO. 1 OF 3 REV. HIGH EFFICIENCY 2-PHASE BUCK-BOOST CONVERTER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only VIN PRODUCTION DESCRIPTION REVISION HISTORY TECHNOLOGY 330uF 25V CIN1 270uF 50V + + COUT1 2 REV TITLE: SCHEMATIC 1W 2512 R2 0.003 R20 0 APPROVALS C64 C65 2.2uF 1206 50V PCB DES. C31 C30 C29 C23 (OPT) 1210 C32 C63 2.2uF 50V 1206 IREF1 C62 2.2uF 50V 1206 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. G Q9 Q5 BSC010NE2LS XAL1580-302ME L1 3uH D6 2 C28 C21 C20 C19 C17 C16 22uF 16V 1210 R65 (OPT) C14 3.3uF 50V (OPT) 1210 B340A VOUT1 C35 3.3uF 50V (OPT) 1210 Q3 BSC010NE2LS Q8 (OPT) G C9 C25 C26 C27 3.3uF 50V 1210 D S D S 5 A B C D DEMO MANUAL DC2253A Schematic Diagram dc2253af 9 A B C EXTVCC Run R76 0 PLLIN2 SS 5 R45 1K CSS1 0.1uF R62 0 R63 OPT CC3 VIN2+ VOUT R41 100 C34 OPT C33 OPT 2. INSTALL SHUNTS AS SHOWN. 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 4 RC1 10K R44 10K 4 4.7uF C38 2 1 U2 0805 14 13 12 11 10 9 8 7 6 5 IOSENSE- IOSENSE+ ILIM VOUTSNS VINSNS RUN FREQ MODE/PLLIN SGND ITH SENSE1- SS VFB TRIM SW2 TG2 BOOST2 BG2 EXTVCC INTVCC VIN BG1 PGND BOOST1 TG1 SW1 15 16 17 18 19 20 21 22 23 24 25 26 27 28 R36 100 PGOOD LTC3789EGN 3 SENSE1+ C51 68pF 4 R67 0 VFB1 CC4 100pF R40 100 100 100 0.01uF R53 R54 R68 OPT NOTE: UNLESS OTHERWISE SPECIFIED R73 R34 10K R74 OPT INTVCC2 CF2 OPT VOS+ (OPT) R69 0 INTVCC2 0 R72 ITH1 CF3 OPT RFB4 (OPT) RFB3 (OPT) R50 100K INTVCC2 0 5.1 C52 0.22uF 16V R38 OPT 0 3 R35 0.006 2W 6.3V D13 DFLS160 R460 C57 10uF G Q12 BSC027N04LS Q13 (OPT) VOUT R70 G C5 0.22uF 16V R39 OPT R71 OPT IREF1 R37 100 0805 R55 10 C55 1uF 16V INTVCC2 D12 DFLS160 R57 0 R51 R48 0 R43 0 VIN2+ R58 Q16 Q17 BSC027N04LS C39 0.1uF 50V 3 D S D S R64 0.006 2W D11 B340A C60 (OPT) 1206 R61 (OPT) 1206 L2 3uH 2 Jeoffrey W. APP ENG. SCALE = NONE HZ 1 330uF 16V + COUT4 TP20 DATE VIN2+ CHARLIE Z. 6-9-11 APPROVED DATE: N/A SIZE 1 SHEET 2 LTC3789EGN DEMO CIRCUIT 2253A Wednesday, September 03, 2014 IC NO. 1 OF 3 REV. HIGH EFFICIENCY 2-PHASE BUCK-BOOST CONVERTER 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only CIN3 270uF 50V VOUT + VIN PRODUCTION DESCRIPTION REVISION HISTORY TECHNOLOGY 330uF 16V + + COUT3 CIN4 270uF 50V 2 REV TITLE: SCHEMATIC 1W 2512 __ ECO R59 0.003 APPROVALS C68 C69 2.2uF 50V 1206 C67 2.2uF 50V 1206 R33 0 PCB DES. (OPT) 1210 C50 C47 C49 C46 C48 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE R60 (OPT) C59 (OPT) C53 C44 C42 C40 C43 C58 22uF 16V 1210 C66 2.2uF 50V 1206 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. G Q14 Q15 BSC010NE2LS XAL1580-302ME 2 C41 3.3uF 50V (OPT) 1210 D10 B340A C36 3.3uF 50V (OPT) 1210 VOUT2 Q10 BSC010NE2LS Q11 (OPT) G C37 C56 C45 C54 3.3uF 50V 1210 D S D 10 S D 5 A B C D DEMO MANUAL DC2253A Schematic Diagram dc2253af 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 5 SET GND V+ THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 4 3 4 5 6 SCALE = NONE 3 PLLIN1 PLLIN2 TECHNOLOGY 2 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only 1 DATE: N/A SIZE 2 1 SHEET 3 LTC3789EGN DEMO CIRCUIT 2253A Tuesday, May 06, 2014 IC NO. OF 3 1 REV. HIGH EFFICIENCY 2-PHASE BUCK-BOOST CONVERTER Jeoffrey W. TITLE: SCHEMATIC HZ APPROVALS OUT1 OUT2 MOD U3 LTC6908CDCB-1 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. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 3 2 1 CUSTOMER NOTICE C61 0.1uF R56 499K INTVCC1 4 GND 7 D 5 A B C D DEMO MANUAL DC2253A Schematic Diagram dc2253af 11 DEMO MANUAL DC2253A 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 12 Linear Technology Corporation dc2253af LT 1014 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014