LT8705A

LT8705A LINER

Document overview

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Technical content

DESCRIPTION

80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller L, L T , L TC, L TM, Linear Technology , the Linear logo and Burst Mode are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Demonstration circuit 2285A features two high power high performance buck-boost LT®8705A converters operating in master-slave configuration. The circuit can operate with input voltages above, below or equal to the output voltage. The demo board input range is 36V to 75V. The output is optimized for 48V at 18A, with the output current limit set at 20A. The circuit will operate with lower input voltage than 36V if load current is reduced. The LT8705A controller has integrated input current, input voltage, output current and output voltage regulators. The one regulator that wants to decrease current gets control over the compensation pin V C. The inductor current is controlled by the VC signal that is fed into a current com- parator together with a ramp compensation signal. While the current mode control limits the inductor both in normal and in reverse direction, these current limits have some variation as input voltage changes. The input and output current regulators offer more accurate current limits. The input voltage regulator is typically used in applica - tions with solar panels or high impedance power sources, and will reduce the current if input voltage drops below the set point. The operating mode of the controller is determined through the MODE pin (jumper JP1) and can be set to discontinuous mode, forced continuous mode and Burst Mode® operation. The LT8705A is capable of bidirectional current flow when operating in forced continuous operation. It is important to know that additional circuitry is required for controlled reverse current operation, and this additional circuitry can be elaborate in high power applications where tight con- trol of current amplitude is required. The SYNC inputs are used to synchronize the two LT8705A power stages with 180-degree phase shift. The DC2285A demo board contains a multiphase clock. The LT8705A has internal series regulators that provide INTVCC voltage (6.3V Typ) from VIN or EXTVCC. Especially in high power applications the internal dissipation of these series regulators can be high. The DC2285A demo board includes an LT8631 buck regulator that is configured for 7.8V. By connecting this low voltage to V IN and EXTVCC the power dissipation is reduced. The auxiliary 7.8V can also be used to power external circuitry. The LT8705A data sheet gives a complete description of the part, operation and application information. The data sheet should be read in conjunction with this quick start guide for demo circuit 2285A. The input voltage range of the LT8705A itself is 2.8V (with external auxiliary voltage > 6.4V) to 80V and the output range is 1.3V to 80V. The DC2285A demo board has an optional signal interface that makes it easy to add potentiometers and switches (or a microcontroller) for accurate external control of the power stages. The LT8705AEUHF is assembled in a 38-lead (5mm × 7mm) plastic QFN package with a thermal pad underneath the chip. Proper board layout is essential for maximum thermal and electrical performance. The DC2285A circuit board has mounting holes for an optional heat sink and NTC resistor for monitoring heat sink temperature. Design files for this circuit board are available at http://www.linear .com/demo/DC2285A

Figure 1. Efficiency and Dissipation at 18A Load

1. Demonstration circuit 2285A is easy to set up to evalu- ate the performance of the LT8705A. Refer to Figure 2 for proper measurement equipment setup and follow the procedure below. Make sure the configuration jumpers are set correctly. 2. With power off, connect the input power supply to VIN (J3) and GND (J4). 3. Connect the SHUTDOWN pin (J7: 10) to VAUX (J7:12) to disable the board. 4. Apply 48V to the input. The power source must have greater than 38A capability if you want to evaluate the board with full load over the input range. 5. Open the connection from SHUTDOWN to V AUX to enable the board. 6. Note that the demo circuit will operate at V IN down to 32V, as set by the FB IN loop. If operation at this low input voltage is not preferred, increase the value of R67. 7. Once the proper output voltage is established, adjust the load and the input voltage within the operating range and observe the output voltage regulation, effi - ciency and other parameters as needed. When measur- ing input/output voltages, measure at the input/output terminals of the board to avoid measurement error caused by voltage drops in cables. 8. To measure input/output voltage ripple, avoid a long ground lead on the oscilloscope probe. A commonly accepted method is to remove the oscilloscope probe end cap and ground lead and set the 20MHz bandwidth limit on the oscilloscope. Measure the input/output voltage ripple by touching the probe tip directly to the positive terminal of the input or output capacitor . Con- nect the probe ground terminal to the board ’s GND plane near the capacitor with a very short wire.

Figure 2. Proper Measurement Equipment Setup

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 3 CIN4, CIN5, CIN6 CAP ., ALUM., 33μF, 80V, 20% PANASONIC, EEHZA1K330P 2 3 COUT1, COUT2, COUT3 CAP ., ALUM., 56μF, 63V, 20% SUN ELEC., 63HVH56M 3 3 C1, C53, C56 CAP ., CER., 10000pF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E103KA01D 4 4 C2, C3, C25, C26 CAP ., CER., 0.22μF, X7R, 16V, 10%, 0603 TDK, C1608X7R1C224K080AC 5 2 C4, C27 CAP ., CER., 0.1μF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C104KA01D 6 1 C5 CAP ., CER., 0.47μF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C474KA88D 7 4 C6, C7, C28, C29 CAP ., CER., 1μF, X7R, 16V, 10%, 0805 MURATA, GRM21BR71C105KA01L 8 8 C8, C9, C10, C11, C30-C33 CAP ., CER., 10μF, X7S, 100V, 20%, 2220 TDK, CKG57KX7S2A106M335JH 9 4 C12, C13, C34, C35 CAP ., CER., 1000pF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E102KA01D 10 2 C14, C36 CAP ., CER., 1μF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C105KA12D 11 1 C15 CAP ., CER., 6800pF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E682KA01D 12 2 C16, C38 CAP ., CER., 220pF, NP0, 25V, 10%, 0603 AVX, 06033A221KAT2A 13 6 C19, C20, C21, C40, C41, C42 CAP ., CER., 4.7μF, X5R, 16V, 10%, 0603 TDK, C1608X5R1C475K080AC 14 1 C37 CAP ., CER., 4700pF, NP0, 50V, 5%, 0603 MURATA, GRM1885C1H472JA01D 15 4 D1, D2, D3, D4 DIODE, 200V, 1A, SOD123F CENTRAL SEMI., CMMR1U-02 16 2 L1, L2 IND., PWR., HIGH CURRENT , 15μH, ±10% COILCRAFT , SER2918H-153KL 17 4 M1, M4, M7, M8 XSTR., MOSFET , N-CH, 80V, 100A, PG-TDSON-8 INFINEON, BSC040N08NS5 18 4 M2, M3, M9, M10 XSTR., MOSFET , N-CH, 80V, PG-TDSON-8 INFINEON, BSC117N08NS5 19 1 RSNS1 RES, CHIP , SENSE, 0.003Ω, 3W, 1%, WIDE 2512 SUSUMU, KRL6432E-M-R003-F-T1 20 2 RSNS2, RSNS4 RES, CHIP , SENSE, 0.004Ω, 3W, 1%, WIDE 2512 SUSUMU, KRL6432E-M-R004-F-T1 21 2 RSNS3, RSNS5 RES, CHIP , SENSE, 0.006Ω, 3W, 1%, WIDE 2512 SUSUMU, KRL6432E-M-R006-F-T1 22 8 R1-R4, R30-R33 RES, CHIP , 1Ω, 1/10W, 1%, 0603 VISHAY, CRCW06031R00FKEA 23 2 R8, R37 RES, CHIP , 3.3Ω, 1/10W, 1%, 0603 VISHAY, CRCW06033R30FKEA 24 4 R9, R10, R38, R39 RES, CHIP , 10Ω, 1/10W, 1%, 0603 VISHAY, CRCW060310R0FKEA 25 2 R11, R40 RES, CHIP , 22.1Ω, 1/10W, 1%, 0603 VISHAY , CRCW060322R1FKEA 26 1 R12 RES, CHIP , 49.9Ω, 1/10W, 1%, 0603 VISHAY, CRCW060349R9FKEA 27 1 R16 RES, CHIP , 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA 28 1 R65 RES, CHIP , 10k, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA 29 1 R21 RES, CHIP , 23.7k, 1/10W, 1%, 0603 VISHAY, CRCW060323K7FKEA 30 2 R22, R43 RES, CHIP , 365k, 1/10W, 1%, 0603 VISHAY, CRCW0603365KFKEA 31 1 R23 RES, CHIP , 20k, 1/10W, 1%, 0603 VISHAY, CRCW060320K0FKEA 32 1 R26 RES, CHIP , 750k, 1/10W, 1%, 0603 VISHAY, CRCW0603750KFKEA 33 1 R42 RES, CHIP , 12.1k, 1/10W, 1%, 0603 VISHAY, CRCW060312K1FKEA 34 1 R45 RES, CHIP , 590k, 1/10W, 1%, 0603 VISHAY, CRCW0603590KFKEA 35 1 R44 RES, CHIP , 16.9k, 1/10W, 1%, 0603 VISHAY, CRCW060316K9FKEA 36 1 R73 RES, CHIP , 34.8k, 1/10W, 1%, 0603 VISHAY, CRCW060334K8FKEA 37 1 R75 RES, CHIP , 36.5k, 1/10W, 1%, 0603 VISHAY, CRCW060336K5FKEA 38 2 R79, R80 RES, CHIP , 38.3k, 1/10W, 1%, 0603 VISHAY, CRCW060338K3FKEA

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 39 1 R81 RES, CHIP , 48.7k, 1/10W, 1%, 0603 VISHAY, CRCW060348K7FKEA 40 1 R82 RES, CHIP , 60.4k, 1/10W, 1%, 0603 VISHAY, CRCW060360K4FKEA 41 2 U1, U2 I.C., BUCK BOOST DC/DC CONTROLLER, 38-QFN LINEAR TECH., LT8705AEUHF#PBF 42 1 U4 I.C., OP AMP , SO14 LINEAR TECH., LTC2052CS#PBF Additional Demo Board Circuit Components 1 7 C1, C55, C57, C58, C59, C60, C61 CAP ., CER., 10000pF, X7R, 25V, 10%, 0603 MURATA, GRM188R71E103KA01D 2 1 C46 CAP ., CER., 0.1μF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C104KA01D 3 1 C47 CAP ., CER., 1μF, X7R, 16V, 10%, 0603 MURATA, GRM188R71C105KA12D 4 3 C17, C18, C39 CAP ., CER., 22pF, NP0, 25V, 5%, 0603 AVX, 06033A220JAT2A 5 1 C45 CAP ., CER., 0.1μF, X7R, 10V, 10%, 0402 MURATA, GRM155R71A104KA01D 6 1 C48 CAP ., CER., 1μF, X7R, 100V, 10%, 1210 AVX, 12101C105KAT2A 7 1 C49 CAP ., CER., 2.2μF, X5R, 10V, 10%, 0402 MURATA, GRM155R61A225KE95D 8 1 C50 CAP ., ALUM., 22μF, 100V, 20% SUNCON, 100CE22BS 9 1 C51 CAP ., CER., 4.7pF, NP0, 50V, ±0.25pF, 0603 MURATA, GRM1885C1H4R7CA01D 10 1 C52 CAP ., CER., 47μF, X5R, 10V, 10%, 1210 MURATA, GRM32ER61A476KE20K 11 2 D5, D6 DIODE, SCHOTTKY, 100V, POWERDI123 DIODES INC., DFLS1100-7 12 5 D9, D10, D11, D12, D13 DIODE, 75V, 150mA, SOD-323 VISHAY, 1N4148WS-E3-08 13 1 JP1 HEADER 4-PIN 0.079 SINGLE ROW WURTH ELEKTRONIK, 62000411121 14 4 JP2, JP3, JP4, JP5 HEADER 3-PIN 0.079 SINGLE ROW WURTH ELEKTRONIK, 62000311121 15 4 XJP1, XJP2, XJP3, XJP4 SHUNT , 2mm WURTH ELEKTRONIK, 60800213421 16 0 J1, J2 (OPT) RIGHT ANGLE CONTACT , 45A ANDERSON POWER, 1336G1 17 0 J1, J2 (OPT) HOUSING, +PIN, RED ANDERSON POWER, 1327-BK 18 0 J1, J2 (OPT) HOUSING, –PIN, BLACK ANDERSON POWER, 1327G6-BK 19 0 J1, J2 (OPT) STAPLES FOR PCB ASSY. ANDERSON POWER, 114555P2 20 1 J7 HEADER 13-PIN 0.100 DOUBLE ROW WURTH ELEKTRONIK, 61302621121 21 1 J8 HEADER 4-PIN 0.100 SINGLE ROW WURTH ELEKTRONIK, 61300411121 22 1 J9 HEADER 3-PIN 0.100 SINGLE ROW WURTH ELEKTRONIK, 61300311121 23 1 J10 HEADER 4-PIN 0.100 DOUBLE ROW WURTH ELEKTRONIK, 61300821121 24 0 J11 (OPT) HEADER 4-PIN , OPTION 25 1 L3 IND., PWR., 22μH VISHAY, IHLP2525CZER220M11 26 0 M5, M6, M11, M12 (OPT) XSTR., MOSFET , OPTION, PG-TDSON-8 27 1 Q1 TRANS, NPN, 40V, 0.6A, SOT-23 FAIRCHILD SEMI., MMBT3904 28 2 Q2, Q3 TRANS, PNP , 40V, 0.2A , SOT-23 FAIRCHILD SEMI., MMBT3906 29 1 Q4 XSTR., MOSFET , N-CH, 60V, 150MA, SOT-23 DIODES INC., BS170FTA 30 1 RT1 THERMISTOR, 10k, NTC, 0603 MURATA, NCU18XH103J6SRB 31 5 R5, R6, R7, R35, R36 RES, CHIP , 1Ω, 1/10W, 1%, 0603 VISHAY , CRCW06031R00FKEA 32 8 R13, R14, R15, R41, R89, R90, R92, R93RES, CHIP , 100k, 1/10W, 1%, 0603 VISHAY, CRCW0603100KFKEA PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 33 0 R17, R27, R48, R53, R69, R100, R103, R104, R106-R113, R118 (OPT) RES., OPTION, 0603 34 10 R18, R56, R57, R59, R60, R91, R115, R116, R117 RES, CHIP , 10k, 1/10W, 1%, 0603 VISHAY, CRCW060310K0FKEA 35 5 R19, R55, R64, R66, R67 RES, CHIP , 1k, 1/10W, 1%, 0603 VISHAY, CRCW06031K00FKEA 36 1 R77 RES, CHIP , 365k, 1/10W, 1%, 0603 VISHAY, CRCW0603365KFKEA 37 1 R24 RES, CHIP , 46.4k, 1/10W, 1%, 0603 VISHAY, CRCW060346K4FKEA 38 1 R25 RES, CHIP , 47.5k, 1/10W, 1%, 0603 VISHAY, CRCW060347K5FKEA 39 1 R49 RES, CHIP , 115k, 1/10W, 1%, 0603 VISHAY, CRCW0603115KFKEA 40 5 R50, R51, R68, R70, R101 RES, CHIP , 1M, 1/10W, 1%, 0603 VISHAY, CRCW06031M00FKEA 41 1 R52 RES, CHIP , 25.5k, 1/10W, 1%, 0603 VISHAY, CRCW060325K5FKEA 42 1 R58 RES, CHIP , 34.8k, 1/10W, 1%, 0603 VISHAY, CRCW060334K8FKEA 43 1 R61 RES, CHIP , 150k, 1/10W, 1%, 0603 VISHAY, CRCW0603150KFKEA 44 2 R62, R63 RES, CHIP , 14.7k, 1/10W, 1%, 0603 VISHAY, CRCW060314K7FKEA 45 1 R72 RES, CHIP , 412k, 1/10W, 1%, 0603 VISHAY, CRCW0603412KFKEA 46 2 R74, R76 RES, CHIP , 36.5k, 1/10W, 1%, 0603 VISHAY, CRCW060336K5FKEA 47 1 R78 RES, CHIP , 38.3k, 1/10W, 1%, 0603 VISHAY, CRCW060338K3FKEA 48 1 R83 RES, CHIP , 576k, 1/10W, 1%, 0603 VISHAY, CRCW0603576KFKEA 49 2 R84, R85 RES, CHIP , 51.1k, 1/10W, 1%, 0603 VISHAY, CRCW060351K1FKEA 50 1 R86 RES, CHIP , 75k, 1/10W, 1%, 0603 VISHAY, CRCW060375K0FKEA 51 1 R88 RES, CHIP , 30.1k, 1/10W, 1%, 0603 VISHAY, CRCW060330K1FKEA 52 1 R102 RES, CHIP , 383k, 1/10W, 1%, 0603 VISHAY, CRCW0603383KFKEA 53 2 R54, R105, R119 RES, CHIP , 0Ω, 1/10W, 1%, 0603 VISHAY, CRCW06030000Z0EA 54 1 R114 RES, CHIP , 422k, 1/10W, 1%, 0603 VISHAY, CRCW0603422KFKEA 55 1 U3 I.C. REGULATOR, 20-TSSOP LINEAR TECH., LT8631EFE#PBF 56 1 U5 I.C., OP AMP , SO14 LINEAR TECH., LTC2052CS#PBF Hardware: For Demo Board Only 1 4 J3, J4, J5, J6 STUD, TEST PIN PEM, KFH-032-10ET 2 8 J3, J4, J5, J6 NUT , BRASS NUTS # 10-32 ANY, 10-32M/S BR PL 3 8 J3, J4, J5, J6 RING, LUG RING # 10 KEYSTONE, 8208 4 4 J3, J4, J5, J6 WASHER, TIN PLATED BRASS ANY, #10EXT- BZ TN 5 4 MH1-MH4 STAND-OFF , NYLON 0.375" WURTH ELEKTRONIK, 702933000 6 1 PCB, DC2285A DEMO CIRCUIT 2285A 7 2 STENCIL, DC2285A (TOP & BOTTOM) STENCIL DC2285A PARTS LIST

(80V) (80V) VOUTVIN VIN LDO33 LDO33 LDO33 LDO33 VIN LDO33 LDO33 LDO33 LDO33 LDO33 VCC_INT VCC_INT SYNC VAUX SHUTDOWN VOUTSNS CLKOUT2 IMONOUT2 MODE SWEN2 SHDN1 VAUX SWEN CLKOUT SYNC2 SYNC3 SYNC R113 OPT D121N4148WS 1 2 R14 100K R17 OPT 15uH SER2918H-153KL C58 0.01uF R91 10k R12 49.9 R66 R82 57.6K C17 22pF R81 48.7K R63 14.7K U4C LTC2052CS R69 R61 150K R83 576K 0.01uF R76 36.5K R117 10K R89 100K R109 OPT R16 100K R103 OPT C14 1uF M5OPT 5 3 6 2 U5A LTC2052CS 4 11 C61 0.01uF R57 10K C1110uF 100V CKG57K MMBT3904 3 2 R85 51.1K R104 OPT R55 R84 51.1K C59 0.01uF BS170F/SOT1 3 2 R74 36.5K R21 23.7K JP3 C15 6.8nF NP0 C54 0.01uF RSNS30.006

1225 Wide

0.01uF R19 R11 22.1 C194.7uF C62 0.1uF R59 10K R78 38.3K D11 1N4148WS R18 10K 0.22uFR10 U4A LTC2052CS 4 11 R22 365K BSC117N08NS5 5 3 6 2 C16 220pF NP0 C13 1nF R111 OPT R65 10K 1.0uF 0805 RSNS1 0.003 1225 1W 1% C1010uF 100V CKG57K R80 38.3k U5C LTC2052CS RSNS2 0.004 1225 1W 1% BSC040N08NS5 5 3 6 2 C18 22pF D131N4148WS 1 2 R64 C53 0.01uF J12 J11 OPT 1.0uF 0805 R115 10K R100 OPT R58 34.8K BSC117N08NS5 5 3 6 2 R60 10K R27 OPT D10 1N4148WS R25 47.5K R86 34.8k 0.22uF R23 20K R75 36.5K 1N4148WS R105 U5B LTC2052CS U4B LTC2052CS 3.3 R68 JP5 C60 0.01uF R77 365K R24 46.4K U4D LTC2052CS R13 100K BSC040N08NS5 1 7 R72 412K MMBT3906/SOT J9 13 C810uF 100V CKG57K JP2 T RT1 10K NTC C63 0.1uF C910uF 100V CKG57K R114 422K JP4 R26 750K R102 383K C12 1nF R106 OPT R79 38.3k R67 0.1uF CMMR1U-02 2 1 JP1 C56 0.01uF R120 221K R108 OPT C21 4.7uF OPT 5 3 6 2 R62 14.7K J10 1 2 5 6 7 8 C204.7uF R118 100K R90 100K 0.47uF CMMR1U-02 2 1 C55 0.01uF R88 30.1k R110 OPT U1LT8705AEUHF INTVCC35 MODE37 IMONIN38 #SHDN1 CSN2 CSP3 LDO334 FBIN5 FBOUT 6 IMONOUT7 RT 12 BG216 GATEVCC15 BG114 BOOST217 TG218 SW219 SW121 TG122 BOOST123 EXTVCC29 CSNOUT 30 CSPOUT 31 CSNIN32 CSPIN33 AGND13 VIN34 39PGND SYNC11 VC 8 SS 9 CLKOUT 10 N/C 20 N/C 24 SRVO_FBOUT 28 SRVO_FBIN 25 SRVO_IIN 26 SRVO_IOUT 27 SWEN 36 R70 R119 R112 OPT R73 34.8K U5D LTC2052CS12 R107 OPT LTC6909CMS V A1 GND2 PH03 PH14 OUT15 OUT26 OUT37 OUT48 OUT5 9 OUT6 10 OUT7 11 OUT8 12 V D 13 MOD 14 PH2 15 SET 16 CSNOUT FBOUT LDO33 IMONIN CSNIN IMONOUT SHDN1 CSPOUT LDO33 VAUX VINADJ IINADJ IOUTADJ VOUTADJ VINADJ IMONOUT IINADJ CLKOUT SHARE VOUTADJFBIN IOW IOUTADJ IMONIN IMONOUT FBOUT IMONOUT IOUTADJ ICTRL2 IMONOUT2 VC IMONIN SWEN SHUTDOWN MODE VAUX GND GND TEMP TEMP MODE LDO33 GND CLKOUT3 IMONOUT3 SWEN SWEN2 SHDN1 FBIN SWEN SWEN2 VIN VOUT PH1 PH3 PH5 PH7 PH2 PH4 PH6 PH8 CLKOUT3 SYNC3 PH2 PH3 PH4 PH5 PH6 PH7 PH8 PH1 PH1 LDO33 ICTRL2 ICTRL ICTRL IOWIMONOUT3

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 MEGACAPS CKG57KX7S2A106M335JH VIN MAX 75V VOUT 48V / 20A OVP = 60.1V (400kHz) IHLP2525CZER220M11 7.8V 0.25A (1A peak) VOUTVIN VIN VOUT VINVOUT LDO33 VCC_INT2 VCC_INT2 SYNC2 VAUX LDO33_2 VOUTSNS CLKOUT2 IMONOUT2MODE SWEN2 SHDN1 SWEN SWEN2 R54 R38 R30 OPT C45 0.1uF 0402 10V C414.7uF C26 0.22uF BSC117N08NS5 5 3 6 2 8R31 R93 100K GND R52 25.5K R49 115K R42 12.1K U2LT8705AEUHF INTVCC35 MODE37 IMONIN38 #SHDN1 CSN2 CSP3 LDO334 FBIN5 FBOUT 6 IMONOUT7 RT 12 BG216 GATEVCC15 BG114 BOOST217 TG218 SW219 SW121 TG122 BOOST123 EXTVCC29 CSNOUT 30 CSPOUT 31 CSNIN32 CSPIN33 AGND13 VIN34 39PGND SYNC11 VC 8 SS 9 CLKOUT 10 N/C 20 N/C 24 SRVO_FBOUT 28 SRVO_FBIN 25 SRVO_IIN 26 SRVO_IOUT 27 SWEN 36 D6DFLS1100 2 1 C39 22pF R33 M11OPT 5 3 6 2 C52 47uF 10V 1210 M12 OPT 5 3 6 2 R32 R36 M8BSC040N08NS5 1 7 CMMR1U-02 2 1 C27 0.1uF C28 1.0uF 0805 R39 C38 220pF NP0 15uH SER2918H-153KL +C50 22uF 100CE22BS 100V BSC040N08NS5 5 3 6 2 R51 C49 0402 2.2uF 10V C35 1nF + CIN4 33uF 80V EEHZA1K330P C29 1.0uF 0805 RSNS4 0.004 1225 1W 1% R92 100K R50 R48 OPT C3210uF 100V CKG57K LT8631EFE INTVCC 16 VIN1 NC 13 SYNC/MODE7 BST 18 FB 11 IND 14 GND RT8 NC9 NC 15 SW 20 PG5 VOUT 12 EN/UV3 NC6 TR/SS10 C51 4.7pF OPT C37 4.7nF NP0 C3310uF 100V CKG57K R44 16.9K C3010uF 100V CKG57K C48 1uF 100V 1210 +COUT2 56uF 63V 63HVH56M D5DFLS1100 2 1 +COUT3 56uF 63V 63HVH56M C34 1nF CMMR1U-02 2 1 R35 + CIN6 33uF 80V C47 1uF 10V R40 22.1 C25 0.22uF RSNS5 0.006 3.3 C46 0.1uF R43 365K C404.7uF + CIN5 33uF 80V R41 100K M10 BSC117N08NS5 5 3 6 2 R53 OPT 22uH R45 590K C42 4.7uF +COUT1 56uF 63V 63HVH56M C3110uF 100V CKG57K CSNOUT2 FBOUT2 CSPOUT2 VAUX LDO33_2 VAUX

DC2285A  LINEAR TECHNOLOGY CORPORATION 2017 LT 0817 • 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