DEMO MANUAL DC1997A-A/DC1997A-B LTC3838EUHF-1/ LTC3838EUHF-2 High Current, Dual Output Synchronous Buck Converter DESCRIPTION Demonstration circuits DC1997A-A/DC1997A-B are dual output synchronous buck converters featuring the LTC®3838EUHF-1/LTC3838EUHF-2. Both assemblies provide two outputs of 1.5V/20A and 1.2V/20A over an input voltage range of 4.5V to 14V at a switching frequency of 300kHz. Applications requiring the output to be adjusted with an external reference can be implemented with the DC1997A-B assembly. Such applications include adaptive voltage scaling optimization (AVSO) where the processor voltage is adjusted to achieve optimal efficiency, wide output voltage applications controlled by a DAC, or margining. The 2nd channel of the DC1997A-B assembly is regulated to an onboard 1.2V reference in the default setup. The same reference can be set from 0.8V to 1.5V with a potentiometer or the 2nd channel can regulate to a source external to the board. The 1st channel on the DC1997A-B assembly and both channels on the DC1997A-A version are regulated to the internal reference. PERFORMANCE SUMMARY PARAMETER The entire converter, excluding the bulk input and output capacitors, fits within a 1.5in2 area on the board. The high density is a result of the compact, 2-sided drop-in layout and the use of dual channel FETs. Additional features of this demo board include: • Remote sensing for each output. • PLLIN and CLKOUT pins. • PGOOD, RUN and TRK/SS pins for each output. • Optional resistors to tie the two outputs together. • Optional footprint for discrete single channel FETs for higher output current. • Optional footprints to implement DTR (detect transient) to reduce overshoot following a load release. Design files for this circuit board are available at http://www.linear.com/demo 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, No Airflow CONDITION VALUE Minimum Input Voltage 4.5V Maximum Input Voltage 14V Output Voltage VOUT1 IOUT1 = 0A to 20A, VIN = 4.5V to 14V 1.5V ± 2% Output Voltage VOUT2 IOUT2 = 0A to 20A, VIN = 4.5V to 14V 1.2V ± 2% VOUT1 Maximum Output Current, IOUT1 VIN = 4.5V to 14V, VOUT1 = 1.5V 20A VOUT2 Maximum Output Current, IOUT2 VIN = 4.5V to 14V, VOUT2 = 1.2V 20A Nominal Switching Frequency Efficiency (Measured on DC1997A-B Assembly) See Figure 2 300kHz VOUT1 = 1.5V, IOUT1 = 20A, VIN = 12V 90.4% Typical VOUT2 = 1.2V, IOUT2 = 20A, VIN = 12V 88.8% Typical dc1997a-af 1 DEMO MANUAL DC1997A-A/DC1997A-B QUICK START PROCEDURE Demonstration circuit DC1997A-A/DC1997A-B is easy to set up to evaluate the performance of the LTC3838EUHF-1/ LTC3838EUHF-2. Please refer to Figure 1 for proper measurement equipment setup and follow the procedure below. 1.With power off, connect the input supply, load and meters as shown in Figure 1. Preset the load to 0A and VIN supply to be 0V. For both assemblies, place the jumpers in the following positions: JP4 JP1 JP2 RUN1 RUN2 MODE ON ON FCM ON BD REF REF 1.Remove power from the input of the board. 2.Place these jumpers in the following positions: JP5 JP6 ON BD REF REF ADJ ON BD 3.Apply power to the input of the board. 4.Adjust reference with potentiometer at R52. Connecting a Reference External to the Board: 1.Remove power from the input of the board. The DC1997A-B assembly has additional jumpers for the reference circuit. Place these jumpers in the following positions: JP5 JP6 Adjusting the Onboard Reference: FIXED ON BD 2.Adjust the input voltage to be between 4.5V and 14V. VOUT1 should be 1.5V ± 2%. VOUT2 should be 1.2V ± 2%. 3.Next, apply 20A load to each output and re-measure VOUT. 4.Once the DC regulation is confirmed, observe the output voltage ripple, load step response, efficiency and other parameters. Note 1: Use the BNC connectors labeled VOUT1 or VOUT2 to measure the output volt-age ripple. 2.Place JP6 in the EXT position. 3.Connect the external reference between the EXTREF2+ and EXTREF2- turrets. 4.Apply power to the input of the board. 5.Turn-on the external reference. Note 3: For accurate efficiency measurements in DCM at light load at VIN greater than 5V, remove R51 and apply an external reference to the board as mentioned above. Single Output/Dual Phase Operation A single output/dual phase converter may be preferred for higher output current applications. The optional components required to tie the phases together are found on the top middle of the first sheet. To tie the two outputs together, make the following modifications: 1.Tie the two VOUT shapes together with a piece of copper at the edge of the board where the copper is exposed. Note 2: Do not connect load from the VO1_SNS+ turret to the VO1_SNS- turret or from the VO2_SNS+ turret to the VO2_SNS- turret. This could damage the converter. Only apply load across the stud connectors on the edge of the board. 2.Tie the VOUT SENSE1+ pin to INTVCC with a 0Ω jumper at R8. This will tie ITH1 to ITH2 inside the chip. Reference Circuit for Channel 2 of DC1997A-B Assembly 4.If DTR is implemented, then stuff 0Ω jumper at R9 to tie the two DTR pins together. Channel 2 of the DC1997A-B assembly is configured by default to regulate to the fixed 1.2V reference generated by the LT®6650 reference circuit. If desired, this reference can be set with a potentiometer, or an external source such as a DAC or another source. See the following instructions to set the board for either: 2 3.Tie RUN1 to RUN2 by stuffing a 0Ω jumper at R15. dc1997a-af DEMO MANUAL DC1997A-A/DC1997A-B QUICK START PROCEDURE Dynamic Load Circuit (Optional) Demonstration circuit DC1997A-A/DC1997A-B provides a simple load-step circuit consisting of a MOSFET and sense resistor for each rail. To apply a load step, follow the steps below. 1.Pre-set the amplitude of a pulse generator to 0.0V and the duty cycle to 5% or less. 3.Connect the output of the pulse generator to the PULSE turret for the rail under test and connect the return to the adjacent GND turret. 4.With the converter running, slowly increase the amplitude of the pulse generator output to provide the desired load step pulse height. The scaling for the load step signal is 5mV/Amp. 2.Connect the scope to the VOUT BNC connectors for the rail under test with a coax cable. To monitor the load-step current, connect the scope probe across the ISTEP+/- turrets for that rail. – V + VOUT2* – IIN VOUT2 LOAD A + – IOUT2 + VIN SUPPLY – + A V VIN A IOUT1 + VOUT1 LOAD – *MONITOR THE OUTPUT VOLTAGE ACROSS EITHER COUT2 OR COUT7 FOR ACCURATE EFFECIENCY MEASUREMENTS DC1997A F01 – V + VOUT1* Figure 1. Proper Measurement Equipment Setup dc1997a-af 3 DEMO MANUAL DC1997A-A/DC1997A-B QUICK START PROCEDURE LTC3838-2 1.5V/20A and 1.2V/20A Converter 95 LTC3838-2 1.5V/20A and 1.2V/20A Converter 100 FCM, VIN = 12V, fSW = 300kHz 1.5V FCM AND DCM 90 VIN = 12V f = 300kHz 80 SW 1.2V 70 85 80 BOTH RAILS: MOSFET = INFINEON BSC0911ND (DUAL) L = WÜRTH 7443330047 0.47µH, DCR = 0.8mΩ ±10% RSENSE = 1mΩ 75 70 0 5 15 10 LOAD CURRENT (A) 20 25 EFFICIENCY (%) EFFICIENCY (%) 90 50 40 30 1.5V RAIL FCM 1.2V RAIL FCM 1.5V RAIL DCM 1.2V RAIL DCM 20 10 0 0.001 DC1997A F02 Figure 2. Efficiency Curves for the 1.5V Rail and 1.2V Rail of the DC1997A-B Assembly in FCM at VIN = 12V BOTH RAILS: MOSFET = INFINEON BSC0911ND (DUAL) L = WÜRTH 7443330047 0.47µH, DCR = 0.8mΩ ±10% RSENSE = 1mΩ 60 0.01 0.1 1 LOAD CURRENT (A) 10 100 DC1997A F03 Figure 3. Efficiency Curves for the 1.5V Rail and 1.2V Rail of the DC1997A-B Assembly in FCM and DCM at VIN = 12V VOUT2 of the LTC3838-2 Demo Board Adjusted with External Reference 95 FCM, VIN = 12V, fSW = 300kHz 1.6V 90 EFFICIENCY (%) 85 109mV 1.5VO(AC) 50mV/DIV 1.2V 0.8V 20A 80 BOTH RAILS: MOSFET = INFINEON BSC0911ND (DUAL) L = WÜRTH 7443330047 0.47µH, DCR = 0.8mΩ ±10% RSENSE = 1mΩ 75 70 0 5 15 10 LOAD CURRENT (A) 20 DC1997A F05 25 102mV 10A 20µs/DIV COUT = 2× SANYO 2R5TPE330M9, 100µF X5R 1206 L = WÜRTH 7443330047 (0.47µH) fSW = 300kHz DC1997A F04 Figure 4. Efficiency Curves for VOUT2 on the DC1997A-B Assembly at Different Output Voltage Settings 1.2VO(AC) 50mV/DIV LOAD STEP 5A/DIV Figure 5. 50% to 100% to 50% Load Step Response of the 1.5V Rail on the DC1997A-A Assembly 109mV 1.5VO(AC) 50mV/DIV 20A 20A LOAD STEP 5A/DIV LOAD STEP 5A/DIV 10A DC1997A F06 20µs/DIV COUT = 2× SANYO 2R5TPE330M9, 100µF X5R 1206 L = WÜRTH 7443330047 (0.47µH) fSW = 300kHz Figure 6. 50% to 100% to 50% Load Step Response of the 1.2V Rail on the DC1997A-A Assembly 10A DC1997A F07 20µs/DIV COUT = 2× SANYO 2R5TPE330M9, 100µF X5R 1206 L = WÜRTH 7443330047 (0.47µH) fSW = 300kHz Figure 7. 50% to 100% to 50% Load Step Response of the 1.5V Rail on the DC1997A-B Assembly dc1997a-af 4 DEMO MANUAL DC1997A-A/DC1997A-B QUICK START PROCEDURE 97mV 1.2VO(AC) 50mV/DIV RUN1 2V/DIV 20A LOAD STEP 5A/DIV VOUT1 TRACK/SS1 500mV/DIV 10A 2ms/DIV DC1997A F08 20µs/DIV COUT = 2× SANYO 2R5TPE330M9, 100µF X5R 1206 L = WÜRTH 7443330047 (0.47µH) fSW = 300kHz DC1997A F09 CSS = 10nF VIN = 12V, FULL LOAD Figure 8. 50% to 100% to 50% Load Step Response of the 1.2V Rail on the DC1997A-B Assembly Figure 9. Turn-On of the 1.5V Rail of the DC1997A-A Assembly. RUN Pin Released from Ground RUN2 2V/DIV RUN1 2V/DIV VOUT2 TRACK/SS2 500mV/DIV VOUT1 TRACK/SS1 500mV/DIV DC1997A F10 2ms/DIV 2ms/DIV DC1997A F11 CSS = 10nF VIN = 12V, FULL LOAD CSS = 10nF VIN = 12V, FULL LOAD Figure 10. Turn-On of the 1.2V Rail of the DC1997A-A Assembly. RUN Pin Released from Ground Figure 11. Turn-On of the 1.5V Rail of the DC1997A-B Assembly. RUN Pin Released from Ground RUN2 2V/DIV EXTVREF 500mV/DIV VOUT2 TRACK/SS2 500mV/DIV 2ms/DIV DC1997A F12 CSS = 4.7nF VIN = 12V, FULL LOAD Figure 12. Turn-On of the 1.2V Rail of the DC1997A-B Assembly. RUN Pin Released from Ground dc1997a-af 5 DEMO MANUAL DC1997A-A/DC1997A-B PARTS LIST–DC1997A-A ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C12 CAP X7R 470pF 16V 5% 0603 AVX 0603YC471JAT2A 2 2 C21, C22 CAP X5R 10µF 16V,10% 0805 MURATA GRM21BR61C106KE15L 3 2 C3, C16 CAP NPO 1000pF 25V 5% 0603 AVX 06033A102JAT2A 4 3 C4, C10, C14 CAP X5R 0.1µF 16V 10% 0603 AVX 0603YD104KAT2A 5 2 C5, C11 CAP NPO 47pF 16V 5% 0603 AVX,0603YA470JAT2A 6 1 C6 CAP X7R 330pF 16V 0603 AVX 0603YC331JAT2A 7 2 C7, C13 CAP X5R 0.01µF 16V 10% 0603 AVX 0603YD103KAT2A 8 1 C8 CAP X5R 4.7µF 16V,10% 0805 AVX 0805YD475KAT2A 9 2 C9, C18 CAP X5R 1µF 16V,10% 0603 AVX 0603YD105KAT2A 10 4 CIN1, CIN2, CIN3, CIN4 CAP X5R 22µF 16V 1210 AVX 1210YD226MAT2A 11 1 CIN6 CAP 180µF 16V SVP-F8 SANYO 16SVP180MX 12 4 COUT1, COUT2, COUT6, COUT7 CAP X5R 100µF 6.3V 20% 1206 MURATA GRM31CR60J107ME39L 13 4 COUT4, COUT5, COUT9, COUT10 CAP 330µF 2.5V SIZE 7343 SANYO 2R5TPE330M9 14 2 D1, D2 DIODE SCHOTTKY SOD-323 CENTRAL SEMI. CMDSH-4E TR 15 2 L1, L2 IND 0.47µH 0.8mΩ DCR WÜRTH 7443330047 16 2 Q1, Q2 MOSFET 5mm x 6mm POWER STAGE INFINEON BSC0911ND 17 2 R13, R45 RES 100k 1% 0603 VISHAY CRCW0603100KFKEA 18 6 R2, R11, R19, R44, R4, R12 RES 10k 1% 0603 VISHAY CRCW060310K0FKEA 19 1 R27 RES CHIP 11k 1% 0603 VISHAY CRCW060311K0FKEA 20 2 R29, R31 RES 2.2Ω 1% 0603 VISHAY CRCW06032R20FKEA 21 1 R30 RES 133k 1% 0603 VISHAY CRCW0603133KFKEA RES 15k 1% 0603 VISHAY CRCW060315K0FKEA 22 2 R32, R40 23 12 R5, R17, R21, R23, R25, R35, R38, R41, RES 0Ω,0603 R42, R50, R14, R24 VISHAY CRCW06030000Z0EA 24 4 R6, R7, R46, R48 RES 10Ω 1% 0603 VISHAY CRCW060310R0FKED 25 2 RS1, RS2 RES 0.001Ω 1W 1% 2512 VISHAY WSL25121L000FEA 26 1 U1 LTC3838EUHF-1 QFN 38-LEAD LINEAR TECH. LTC3838EUHF-1 dc1997a-af 6 DEMO MANUAL DC1997A-A/DC1997A-B PARTS LIST–DC1997A-A ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Additional Circuit Components 1 0 C1, C2, C15, C17, C19, C23, C24 CAP 0603 OPT 2 0 C20 CAP 0805 OPT 3 0 CIN5 CAP SVP-F8 OPT 4 0 CIN7-CIN12 CAP OPT 1210 OPT 5 0 COUT3, COUT8, COUT11-COUT14 CAP OPT 7343 OPT 6 0 D3 DIODE SOD-323 OPT 7 0 E19, E20 TESTPOINT TURRET 0.095" OPT 8 0 JP5, JP6 HEADER OPT 2MM SINGLE 3-PIN OPT 9 2 Q11, Q12 MOSFET N-CH 30V TO-252 FAIRCHILD FDD8874 10 0 Q3-Q10 MOSFET LFPAK OPT 11 0 R1, R3, R8, R9, R10, R15, R16, R18, R20, R22, R26, R28, R33, R34, R36, R37, R39, R43, R47, R49, R63 RES 0603 OPT 12 0 R51, R53, R54, R59, R60, R61, R62 RES 0603 OPT 13 0 R52 RES POT-3313J-1 OPT 14 2 R55, R56 RES 10k 1% 0603 VISHAY CRCW060310K0FKEA 15 2 R57, R58 RES 0.005Ω 1/2W 1% 2010 VISHAY WSL20105L000FEA 16 0 U2 LT6650HS5 SOT23-5 OPT 1 6 J1-J6 STUD TEST PIN PEM KFH-032-10 2 12 J1-J6 NUT BRASS #10-32 ANY 3 6 J1-J6 RING LUG #10 KEYSTONE 8205 4 6 J1-J6 WASHER TIN PLATED BRASS ANY 5 2 J7,J8 CONN BNC 5 PINS CONNEX 112404 6 2 JP1, JP4 HEADER 2MM SINGLE 3-PIN SAMTEC TMM-103-02-L-S 7 2 JP2, JP3 HEADER 2MM SINGLE 4-PIN SAMTEC TMM-104-02-L-S 8 4 XJP1-XJP4 SHUNT SAMTEC 2SN-BK-G Hardware dc1997a-af 7 DEMO MANUAL DC1997A-A/DC1997A-B PARTS LIST–DC1997A-B ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C12 CAP X7R 470pF 16V 5% 0603 AVX 0603YC471JAT2A 2 2 C21, C22 CAP X5R 10µF 16V 10% 0805 MURATA GRM21BR61C106KE15L 3 2 C3, C16 CAP NPO 1000pF 25V 5% 0603 AVX 06033A102JAT2A 4 3 C4, C10, C14 CAP X5R 0.1µF 16V 10% 0603 AVX 0603YD104KAT2A 5 2 C5, C11 CAP NPO 47pF 16V 5% 0603 AVX,0603YA470JAT2A 6 1 C6 CAP NPO 680pF 16V 0603 AVX 0603YC681JAT2A 7 1 C13 CAP X5R 0.01µF 16V 10% 0603 AVX 0603YD103KAT2A 8 1 C7 CAP X7R 4.7nF 10V 0603 AVX 0603ZC472JAT2A 9 1 C8 CAP X5R 4.7µF 16V,10% 0805 AVX 0805YD475KAT2A 10 2 C9, C18 CAP X5R 1µF 16V,10% 0603 AVX 0603YD105KAT2A 11 4 CIN1, CIN2, CIN3, CIN4 CAP X5R 22µF 16V 1210 AVX 1210YD226MAT2A 12 1 CIN6 CAP 180µF 16V SVP-F8 SANYO 16SVP180MX 13 4 COUT1, COUT2, COUT6, COUT7 CAP X5R 100µF 6.3V 20% 1206 MURATA GRM31CR60J107ME39L 14 4 COUT4, COUT5, COUT9, COUT10 CAP 330µF 2.5V SIZE 7343 SANYO 2R5TPE330M9 15 2 D1, D2 DIODE SCHOTTKY SOD-323 CENTRAL SEMI. CMDSH-4E TR 16 2 L1, L2 IND 0.47µH 0.8mΩ DCR WÜRTH 7443330047 17 2 Q1, Q2 MOSFET 5mm x 6mm POWER STAGE INFINEON BSC0911ND 18 3 R13, R24, R45 RES 100k 1% 0603 VISHAY CRCW0603100KFKEA 19 4 R2, R11, R19, R44 RES 10k 1% 0603 VISHAY CRCW060310K0FKEA 20 1 R27 RES CHIP 5.23k 1% 0603 VISHAY CRCW06035K23FKEA 21 2 R29, R31 RES 2.2Ω 1% 0603 VISHAY CRCW06032R20FKEA 22 1 R30 RES 133k 1% 0603 VISHAY CRCW0603133KFKEA 23 2 R32, R40 RES 15k 1% 0603 VISHAY CRCW060315K0FKEA 24 13 R5, R17, R21, R23, R25, R35, R38, R41, RES 0Ω, 0603 R42, R50, R59, R61, R62 VISHAY CRCW06030000Z0EA 25 4 R6, R7, R46, R48 VISHAY CRCW060310R0FKED RES 10Ω 1% 0603 26 2 RS1, RS2 RES 0.001Ω 1W 1% 2512 VISHAY WSL25121L000FEA 27 1 U1 LTC3838EUHF-2 QFN 38-LEAD LINEAR TECH. LTC3838EUHF-2 dc1997a-af 8 DEMO MANUAL DC1997A-A/DC1997A-B PARTS LIST–DC1997A-B ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Additional Circuit Components 1 0 C1, C2, C15, C17 CAP 0603 OPT 2 1 C19 CAP X5R 1µF 16V 0603 AVX 0603YD105KAT2A 3 1 C20 CAP X5R 4.7µF 16V 0805 AVX 0805YD475KAT2A 4 1 C23 CAP X5R 1µF 16V 0603 AVX 0603YD105KAT2A 5 1 C24 CAP X5R 0.01µF 16V 0603 AVX 0603YD103KAT2A 6 0 CIN5 CAP SVP-F8 OPT 7 0 CIN7-CIN12 CAP OPT 1210 OPT 8 0 COUT3, COUT8, COUT11-COUT14 CAP OPT 7343 OPT 9 1 D3 DIODE BZT52C5V6S 5.6V ZENER SOD-323 DIODES BZT52C5V6S-7-F 10 2 Q11, Q12 MOSFET N-CH 30V TO-252 FAIRCHILD FDD8874 11 0 Q3-Q10 (OPT) MOSFET LFPAK OPT 12 0 R1, R3, R8, R9, R10, R15, R16, R18, R20, R22, R26, R28, R33, R34, R36, R37, R39, R43, R47, R49, R63 RES 0603 OPT 13 0 R4, R12, R14 RES 0603 OPT 14 1 R51 RES CHIP 10k 1% 0603 VISHAY CRCW060310K0FKEA 15 1 R52 RES POT 20k 1% POT-3313J-1 BOURN 3313J-1-203E 16 1 R53 RES 20k 0.1% 0603 VISHAY PTN0603E2002BST1 17 1 R54 RES 10k 0.1% 0603 VISHAY PTN0603E1002BSTS 18 2 R55, R56 RES 10k 1% 0603 VISHAY CRCW060310K0FKEA 19 2 R57, R58 RES 0.005Ω 1/2W 1% 2010 VISHAY WSL20105L000FEA 20 1 R60 RES CHIP 6.65k 0.1% 0603 VISHAY PTN0603E6651BSTS 21 1 U2 LT6650HS5 SOT23-5 LINEAR TECH. LT6650HS5 1 2 E19, E20 TESTPOINT TURRET 0.095" MILL-MAX 2501-2-00-80-00-00-07-0 Hardware 2 26 E1-E7, E9, E11-E28 TESTPOINT TURRET 0.095" MILL-MAX 2501-2-00-80-00-00-07-0 3 6 J1-J6 STUD TEST PIN PEM KFH-032-10 4 6 J1-J6 NUT BRASS #10-32 ANY 5 6 J1-J6 RING LUG #10 KEYSTONE 8205 6 12 J1-J6 WASHER TIN PLATED BRASS ANY 7 2 J7, J8 CONN BNC 5 PINS CONNEX 112404 8 2 JP1, JP4 HEADER 2MM SINGLE 3-PIN SAMTEC TMM-103-02-L-S 9 2 JP2, JP3 HEADER 2MM SINGLE 4-PIN SAMTEC TMM-104-02-L-S 10 2 JP5, JP6 HEADER 2MM SINGLE 3-PIN SAMTEC TMM-103-02-L-S 11 1 XJP1-XJP4 SHUNT SAMTEC 2SN-BK-G 12 1 XJP5,XJP6 SHUNT SAMTEC 2SN-BK-G dc1997a-af 9 DEMO MANUAL DC1997A-A/DC1997A-B SCHEMATIC DIAGRAM dc1997a-af 10 DEMO MANUAL DC1997A-A/DC1997A-B SCHEMATIC DIAGRAM dc1997a-af 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. 11 DEMO MANUAL DC1997A-A/DC1997A-B 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 dc1997a-af 12 Linear Technology Corporation LT 0113 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2012