DEMO MANUAL DC1753B LTC3880EUJ Dual Phase Step-Down DC/DC Controller with Digital Power Management Description Demonstration circuit 1753B is a dual phase single-output, synchronous buck converter featuring the LTC(R)3880EUJ, a dual phase current mode controller with digital power system management. There are two versions of the board available: n n DC1753B-A: senses inductor current across a sense resistor and has a default switching Freq of 350kHz. DC1753B-B: senses inductor current with the inductor DCR and has a default switching Freq of 425kHz. Either version can be populated with the LTC3880EUJ-1, which allows the user to provide bias power to the IC from an external power supply. The output voltage of the board can be programmed from 0.5V to 3.3V, with output current up to 40A. The factory default setting for the output is 1.8V. The DC1753B powers up to default settings and produces power based on configuration resistors without the need for any serial bus communication. This allows easy Performance Summary evaluation of the DC/DC converter aspects of the LTC3880. To fully explore the extensive digital power management features of the part, download the LTpowerPlayTM GUI software onto your PC and use LTC's I2C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on-the-fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status. GUI DOWNLOAD The software can be downloaded from: http://www.linear.com/ltpowerplay For more details and instructions of LTpowerPlay, please refer to the LTpowerPlay for LTC3880 Quick Start Guide. Design files for this circuit board are available at http://www.linear.com/demo/DC1753B L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25C SYMBOL PARAMETER VIN Input Supply Range CONDITIONS MIN TYP MAX 6.5 12 24 V VOUT Output Voltage Range IOUT = 0A to 20A, VIN = 6.5V to 24V 0.5 1.8 3.3 V VOUT_ACCURACY Output Voltage Accuracy IOUT = 0A to 20A, VIN = 6.5V to 24V VOUT for 0.5V to 3.3V IOUT Output Current Range fSW, A Factory Default Switching, Freq: A (RSENSE) 350 kHz fSW, B Factory Default Switching, Freq: B (DCR) 425 kHz EFFICIENCY Peak Efficiency 91.8 % 0.5 0 VOUT = 1.8V, See Figures 6 and 7 UNITS % 40 A dc1753bf 1 DEMO MANUAL DC1753B Quick Start Procedure Demonstration circuit 1753B makes it easy to evaluate the performance of the LTC3880. Refer to Figure 3 for proper measurement 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 directly across the C20 or C23. See Figure 5 for the proper scope probe technique. 1. Make sure jumpers are in the following positions: JUMPER JP1 Write Protection of LTC3880 JP3 ON LED Indicator JP4 OFF EXTVCC_DRV: External VCC for the LTC3880-1 JP5 C NOTE: If there is no output, temporarily disconnect the load to make sure that the load is not set too high. 7. Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. CONNECTING A PC TO DC1753B GPIO0B to GPIO1B: Tie GPIOs Together 2. With power off, connect the input power supply to VIN and GND. Connect active load to outputs. 3. Make sure RUN switch is OFF. 4. Turn on the power at the input. 6. Check for the correct output voltages. VOUT = 1.8V 0.5%. 8. Connect the dongle and control the output voltages from the GUI. See next section for details. POSITION FUNCTION OFF 5. Turn on the RUN switch as desired. . You can use a PC to reconfigure the power management features of the LTC3880, such as: nominal VOUT, margin set points, OV/UV limits, temperature fault limits, sequencing parameters, the fault log, fault responses, GPIOs and other functionality. The DC1613A dongle may be plugged in regardless of whether or not VIN is present. NOTE: Make sure that the input voltage does not exceed 24V. +12V Power Supply USB CABLE VIN 12-PIN J10 USB to I2C/PMBus Dongle CONNECTOR DC1613A LTC3880 Demo Board DC1753B VOUT LOAD dc1753b F01 Figure 1. Demo Setup with PC 2 dc1753bf DEMO MANUAL DC1753B quick start procedure Plug the dongle into the correct connector. The dongle can be hot plugged. DC1613A CONNECTOR dc1753b F02 Figure 2. Dongle Connector Locations RUN SWITCH1 - + - + + + + - - SHUNT VOUT LOAD - POWER SUPPLY dc1753b F03 Figure 3. Dual Phase Single-Output Test Setup dc1753bf 3 DEMO MANUAL DC1753B quick start procedure Combining DC1753B with Other Digital Power Demo Boards The DC1753B may be plugged together in a multiboard array with other digital power boards using J7 and J8. Measuring Efficiency To accurately measure efficiency of any configuration, do the following: n n n Remove R65 (bleeder resistor on bottom side of board). Set JP3 to OFF to disable the regulator that provides power to LEDs. Measure VIN across the input ceramic capacitor (C18, C19). Measure VOUT across the output ceramic capacitor (C24, C25). To use the on-board LDO to drive INTVCC, make the following modifications to the demo board: n n For applications that require the highest possible efficiency, the LTC3880-1 allows the user to supply the bias current and gate driver current from an external power supply. Connect the power supply, 4.8V to 5.2V, to the INTVCC/EXTVCC pin. Obtain a DC1753B with an LTC3880-1 installed from your Linear Technology Field Applications Engineer. 4 Install R60. To accurately measure efficiency of a demo board containing an LTC3880-1: n n n n Evaluating the LTC3880-1 Set JP4 to ON so that U7 provides the drive to INTVCC. U7 takes the place of the external power supply. Drive INTVCC from an external source through the pin named: INTVCC/EXTVCC. Install R60, R65 if installed Set JP4 to OFF to disable U7. Set JP3 to OFF to disable the regulator that provides power to LEDs. Measure VIN across the input ceramic capacitor (C18, C19). Measure VOUT across the output ceramic capacitor (C24, C25). Measuring Output Ripple Voltage An accurate ripple measurement may be performed by using the configuration in Figure 5 across C20 or C23. dc1753bf DEMO MANUAL DC1753B quick start procedure JP3 JP4 R60 dc1753b F04 INTVCC EXTVCC Figure 4. Jumper Locations: JP3, JP4, R60, INTVCC/EXTVCC Turret + VOUT - COUT GND dc1753b F05 Figure 5. Measuring Output Voltage Ripple dc1753bf 5 DEMO MANUAL DC1753B quick start procedure 92 91 90 89 EFFICIENCY (%) 88 87 86 85 84 12VIN, 1.8VOUT, 350kHz, RSENSE 83 12VIN, 1.5VOUT, 350kHz, RSENSE 82 12VIN, 1.2VOUT, 350kHz, RSENSE 81 12VIN, 1.0VOUT, 350kHz, RSENSE 80 0 5 10 15 20 25 30 35 OUTPUT CURRENT (A) 40 dc1753b F06 Figure 6. Typical Efficiency Curves, Sense Resistor Current Sensing, 12VIN, fSW = 350kHz 92 91 90 89 EFFICIENCY (%) 88 87 86 85 84 12VIN, 1.8VOUT, 425kHz, DCR SENSE 83 12VIN, 1.5VOUT, 425kHz, DCR SENSE 82 12VIN, 1.2VOUT, 425kHz, DCR SENSE 81 12VIN, 1.0VOUT, 425kHz, DCR SENSE 80 0 5 10 15 20 25 30 35 OUTPUT CURRENT (A) 40 dc1753b F07 Figure 7. Typical Efficiency Curves, DCR Current Sensing, 12VIN, fSW = 425kHz 6 dc1753bf DEMO MANUAL DC1753B quick start procedure LTpowerPlay Software GUI LTpowerPlay is a powerful Windows based development environment that supports Linear Technology digital power ICs with EEPROM, including the LTC3880, LTC2974 and LTC2978, the quad and octal PMBus power supply managers. The software supports a variety of different tasks. You can use LTpowerPlay to evaluate Linear Technology ICs by connecting to a demo board system. LTpowerPlay can also be used in an offline mode (with no hardware present) in order to build a multichip configuration file that can be saved and reloaded at a later time. LTpowerPlay provides unprecedented diagnostic and debug features. It becomes a valuable diagnostic tool during board bring-up to program or tweak the power management scheme in a system, or to diagnose power issues when bringing up rails. LTpowerPlay utilizes the DC1613A USB-to-SMBus controller to communicate with one of many potential targets, including the LTC2974's DC1978A demo system, or a customer board. The software also provides an automatic update feature to keep the software current with the latest set of device drivers and documentation. The LTpowerPlay software can be downloaded from: http://linear.com/ltpowerplay To access technical support documents for LTC Digital Power Products visit Help. View online help on the LTpowerPlay menu. Figure 8. LTpowerPlay Software GUI dc1753bf 7 DEMO MANUAL DC1753B GUI quick start procedure LTpowerPlay Software GUI The following procedure describes how to use LTpowerPlay to monitor and change the settings of LTC3880. 1. Download and install the LTPowerPlay GUI: http://linear.com/ltpowerplay 2. Launch the LTpowerPlay GUI. a. The GUI should automatically identify the LTC3880. The system tree on the left hand side should look like this: Then, click the "W" (PC to RAM) icon to write these register values to the LTC3880. After finishing this step, you will see the output voltage will change to 1.5V. b. A green message box shows for a few seconds in the lower left hand corner, confirming that the LTC3880 is communicating: If the write is successful, this message appears: e. To save the changes into the NVM: In the tool bar, click the "RAM to NVM" button: c. In the tool bar, click the "R" (RAM to PC) icon to read the RAM from the LTC3880. This reads the configuration from the RAM of LTC3880 and loads it into the GUI. f. Save the demo board configuration to a (*.proj) file by clicking the Save icon and save the file with a new file name. d. To change the output voltage to a different value, like 1.5V: In the Config tab, type 1.5 in the VOUT_COMMAND box, like this: 8 dc1753bf DEMO MANUAL DC1753B GUI quick start procedure Loading a LTC3880 Configuration (*.proj) File with the GUI n n In the upper left hand corner of the GUI: File > Open > browse to your *.proj file. This will load the file into the GUI. Click the "Go On Line" button to link the GUI to the existing LTC3880, as this: Parts List n n Click on the "W" (PC to RAM) button. This loads the configuration into LTC3880 RAM. Then, you can save the configuration to the EEPROM. Please see previous step f for details. DC1753B-A ITEM QTY REFERENCE Required Circuit Components 1 3 C1, C2, C6 2 1 C17 3 2 C3, C9 4 1 C5 5 1 C8 6 4 C10, C29, C11, C30 7 1 C13 8 4 C20, C23-25 9 2 C12, C14 10 2 C21, C22 11 2 C15, C16 12 4 C18, C19, C27, C28 13 1 C48 14 2 D1, D2 15 2 Q1, Q3 16 2 Q2, Q4 17 2 Q5, Q6 1 Q11 18 19 9 R5, R17, R39, R40-R42, R44, R45, R57 20 1 R66 21 10 R8, R25, R56, R59, R6, R29, R30, R34, R67, R63 22 1 R3 23 1 R24 24 1 R52 25 2 R10, R16 26 4 R11, R12, R13, R14 27 2 L1, L2 28 1 U4 PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., X7R, 0.1F, 50V, 10%, 0603 CAP., X7R, 0.22F, 25V, 10%, 0603 CAP., X7R, 1F, 16V, 10%, 0603 CAP., X5R, 4.7F, 25V, 0805 CAP., X7R, 4700PF, 10%, 50V, 0603 CAP, POSCAP, 330F, 6.3V, D3L CAP, OS-CON 150F, 35V CAP., X5R, 100F, 6.3V, 1210 CAP., X7R, 0.01F, 10%, 50V, 0603 CAP., X5R, 1000pF, 25, 10%, 0603 CAP., X7R, 100pF, 5%, 50V, 0603 CAP., X5R, 10F, 35V, 1210 CAP., X5R, 10F, 6.3V 0603 DIODE, SCHOTTKY, SOD-323 OPTIMOS3 POWER-TRANSISTOR, PG-TDSON-8 OPTIMOS3 POWER-TRANSISTOR, PG-TDSON-8 TRANS, GP, SS, PNP, 40V, SOT-23 MOSFET P-CH, 20V, 0.58A, SOT-23 RES., CHIP, 10k, 5%, 0603 RES., CHIP, 24.3k, 1%, 0603 RES., CHIP, 0 0603 AVX, 06035C104KAT2A TDK, C1608X7R1E224K AVX, 0603YC105KAT2A TAIYO YUDEN, TMK212BJ475KG-T AVX, 06035C472KAT2A SANYO, 6TPF330M9L SUNCON, 35HVP150M AVX, 12106D107MAT2A AVX, 06035C103KAT2A AVX, 06035C102JAT2A AVX, 06035C101KAT2A TAIYO YUDEN, GMK325BJ106KN TDK, C1608X5R0J106M CENTRAL CMDSH-3TR INFINEON, BSC050N03LS INFINEON., BSC011N03LSI ON SEMI MMBT3906LT1G VISHAY TP0101K-T1-E3 VISHAY, CRCW060310K0JNEA VISHAY, CRCW060324K3FKEA YAGEO, RC0603FR-070RL RES., CHIP, 4.87k, 1%, 0603 RES., CHIP, 15.8k, 1%, 0603 RES., CHIP, 2, 1%, 0603 RES., 0.002, 2512, 1% RES., CHIP, 100, 1%, 0603 INDUCTOR, 0.4H IC, LTC3880EUJ, QFN 6mm x 6mm AAC, CR16-4871FM VISHAY, CRCW060315K8FKEA YAGEO, RC0603FR-072RL PANASONIC, ERJ-M1WTF2M0U VISHAY, CRCW0603100RFKEA VITEC., 59PR9875 LINEAR TECH., LTC3880EUJ#010J-1PBF dc1753bf 9 DEMO MANUAL DC1753B Parts List DC1753B-A ITEM QTY REFERENCE Additional Circuit Components 1 1 C50 2 1 C49 3 0 C42-C45 4 0 C4, C38 5 0 C32, C34 6 1 C46 7 1 C35 8 1 C36 9 2 C37, C40 10 1 C41 11 1 D3 12 1 D5 13 0 D6, D9 14 1 Q15 15 0 Q7, Q8, Q9, Q10 16 1 Q14 17 1 Q12 18 4 R49, R62, R64, R66 19 4 R48, R90, R83, R77 20 0 R18, R20, R22, R23, R32, R73, R70, R1, R2, R7, R15, R94, R95, R81, R82, R96, R79, R80 2 R84, R85 21 22 2 R50, R61 23 1 R53 24 1 R55 25 0 R65 26 1 R68 27 0 R60 28 1 R38 29 1 U5 30 1 U6 31 1 U7 Hardware 1 4 JP1, JP3-JP5 2 3 4 5 6 7 8 9 10 11 12 4 1 2 4 4 1 1 0 1 1 28 10 JP1, JP3-JP5 SW1 J1, J2 J3, J4(x2) J3, J4(x2) J14 J15 J9 (OPT) J10 J11 E1-E21, E23, E24, E25, E27, E31, E33 PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., X7R, 0.1F, 50V, 10%, 0603 CAP., X5R, 4.7F, 10V, 0603 CAP, POSCAP, 330F, 6.3V, D3L CAP., 0603 CAP., 1210 CAP., X7R, 0.01F, 10%, 50V, 0603 CAP., X5R, 10F, 35V, 1206 CAP., TANT LOW ESR, 3.3F, 25V, 10% CAP., X7R, 1F, 50V, 1206 CAP., X7R, 2.2F, 16V, 0805 LED GREEN S-GW TYPE SMD LED RED S-TYPE GULL WING SMD DIODE, SCHOTTKY, SOD-323 MOSFET SPEED SRS 30V, 30A, LFPAK OPTIMOS3 POWER-TRANSISTOR, PG-TDSON-8 MOSFET P-CH, 20V, 0.58A, SOT-23 MOSFET N-CH, 60V, 115MA, SOT-23 RES CHIP, 10k, 5%, 0603 RES CHIP, 0, 0603 RES., CHIP, 0603 AVX, 06035C104KAT2A AVX, 0603ZD475KAT2A AVX, 06035C103KAT2A TAIYO YUDEN, GMK316BJ106ML AVX, TPSB335K025R2000 AVX, 12065C105KAT2A AVX, 0805YC223KAT2A PANASONIC LN1371SGTRP PANASONIC LN1271RTR CENTRAL CMDSH-3TR RENESAS RJK0305DPB-00#J0 VISHAY TP0101K-T1-E3 FAIRCHILD 2N7002A VISHAY, CRCW060310K0JNEA YAGEO, RC0603FR-070RL RES., CHIP, 4.99k, 1%, 0603 RES., CHIP, 1.5k, 1%, 0603 RES., CHIP, 200, 1%, 0603 RES., CHIP, 127, 1%, 0603 RES., CHIP, 30, 1%, 1W 2512 RES., CHIP, 0.01, 1%, 2010 RES., 0805 RES., CHIP, 49.9, 1%, 0603 IC, 24LC025-I/ST, SOIC IC, LT1129CS8-3.3 S8 PACKAGE IC, LT1129CS8-5, S8 PACKAGE YEGEO, RC0603FR-074K99L VISAY, CRCW06031K50FKEA YAGEO, RC0603FR-07200RL VISHAY, CRCW0603127RFKEA 0.100" SINGLE ROW HEADER, 3 PIN SAMTEC, TSW-103-07-L-S SHUNT .100" BLK CONNECTOR, SUB MINIATURE SLIDE SWITCHES JACK, BANANA STUD, TESTPIN NUT, BRASS 10-32 CONN., HEADER, 2 x 7, 2mm, R/A (F) CONN., HEADER, 2 x 7, 2mm, R/A (M) HEADER 14POS 2mm VERT GOLD CONN HEADER 12POS 2mm, STR DL PCB CONN, BNC, 5 PINS TESTPOINT, TURRET, .062" SAMTEC, SNT-100-B-G C&K.,JS202011CQN KEYSTONE 575-4 PEM KFH-032-10 ANY #10-32 SULLINS, NPPN072FJFN-RC MOLEX, 87760-1416 MOLEX 87831-1420 FCI 98414-G06-12ULF CONNEX, 112404 MILL-MAX, 2308-2-00-80-00-00-07-0 VISHAY, WSL2010R0100FEA MICROCHIP, 24LC025-I/ST LINEAR TECH. LT1129CS8-3.3 LINEAR TECH, LT1129CS8-5 dc1753bf A B C D E9 E3 J2 J1 E2 JP1 WP ON Q5 MMBT3906LT C15 100pF ITH GND GND VIN 6.5V - 24V VIN SGND OFF E11 ALERTB SYNC SDA SCL ITH C12 10nF R42 10K R23 OPT R24 15.8K 23 16 14 15 40 28 5 26 17 R73 OPT R20 OPT R32 OPT R22 OPT 21 20 19 VOUT_CFG18 FREQ_CFG U4 VTRIM1_CFG VTRIM0_CFG VOUT1_CFG VOUT0_CFG FREQ_CFG SC WP ASEL RUN0 RUN1 TSNS0 TSNS1 ITH0 ITH1 E6 TG0 BG0 ISNS0+ ISNS0- 6 7 ISNS1+ ISNS1- 3 4 12 13 4 * C22 4 4 Q1 * * * * L2 VIN C19 10uF L1 * * R6 * R10 2512 * 1 REV 2512 * R30 C32 C24 OPT 100uF 1210 C34 C25 C23 OPT 100uF 100uF R34 1210 1210 1210 __ ECO CURRENT SENSE CONNECTIONS R7 * C27 10uF 0 OPT THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 0 2 SCALE = NONE YI S. HZ APPROVALS OPT 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 * * R16 R29 C18 10uF * R15 C28 10uF 2 + 1.4K C30 330uF D3L D3L OPT + C43 + C45 D3L OPT D3L OPT + C42 VOUT + DATE: N/A 1 LTC3880EUJ DEMO CIRCUIT 1753B-A/B Monday, July 21, 2014 IC NO. J3 GND GND_SNS R25 0 E8 J4 VOUT_SNS SHEET 1 DUAL-PHASE SINGLE OUTPUT STEP-DOWN DC/DC CONVERTER WITH DIGITAL POWER MANAGEMENT SIZE DATE 6-6-14 D 1 OF 3 REV. A B C VOUT R8 ADJ., MAX 40A 0 E7 C44 D3L OPT YI S. APPROVED 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only 0.56uH TECHNOLOGY 0.22uF 1.0 uF TITLE: SCHEMATIC 0 + 330uF D3L + C29 C11 C20 100uF 330uF 1210 D3L 330uF D3L + C10 PRODUCTION 1 REVISION HISTORY DESCRIPTION R7,R15 R6,R29 R30,R34 R10,R16 R11,R13 R12,R14 C21,C22 C4,C38 L1,L2 OPT 1nF OPEN 0.4uH 0 0 0.002 100 100 * R1 Q7 OPT R2 Q8 OPT CUSTOMER NOTICE 1.4K R1,R2 * R11 OPT FSW * C4 R12 4 4 VIN 350KHz R SENSE * C21 * C38 * R14 OPT Q9 R13 VIN Q10 OPT -B VERSION DCR SENSE 425KHz -A VERSION ASSY 4 4 EXTVCC_DRV VSENSE0+ Q2 BSC011N03LSI 4 C1 100nF VDD33 * 100nF BSC011N03LSI Q4 4 C2 BSC050N03LS Q3 D1 CMDSH-3TR R60 OPT 3 Figure 9. Demo Circuit 1753B Dual-Phase, Single-Output, Step-Down DC/DC Converter with Digital Power Management 2. INSTALL SHUNTS AS SHOWN. 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. GPIO0B R56 0 R67 0 R44 10K BOOST0 VSENSE0- R59 0 R45 10K GPIO1B BG1 32 27 SW1 29 31 30 2 1 SW0 36 TG0 39 37 38 SGND AND PGND CONNECTED AT A SINGLE NODE NEAR U1 GPIO0 GPIO1 VSENSE1 ISNS1- ISNS1+ BG1 SW1 BOOST1 TG1 VSENSE0- VSENSE0+ ISNS0- ISNS0+ BG0 SW0 BOOST0 C48 10uF R63 0 C6 D2 100nF CMDSH-3TR E10 INTVCC/EXTVCC INTVCC VDD33 C5 4.7uF 0805 C9 C3 1uF 1uF ALERT LTC3880EUJ SYNC SDA SCL E5 NOTE: UNLESS OTHERWISE SPECIFIED R18 OPT 8 11 SHARE_CLK 24 WP RUN ASEL C14 10nF R17 10K VDD25 5 R5 10K TSNS0 9 10 VDD33 C17 0.22uF R41 R57 R40 R39 10K 10K 10K 10K R52 2 PLACE Q5,Q6 NEAR L1,L2. RESPECTIVELY R3 4.87K C8 4.7nF C13 150uF 35V Q6 MMBT3906LT VDD33 2 TSNS1 C16 100pF ITH_TP R48 0 + VIN E4 4 2 1 VDD25 GND 2 VDD33 5 1 BOOST1 5 1 2 3 5 5 E1 3 1 VDD25 GND 41 VTRIM_CFG 35 VIN 33 INTVCC 25 VDD33 22 VDD25 PGND 34 BSC050N03LS 5 5 1 2 3 5 51 2 3 1 2 3 1 2 3 1 2 3 5 1 2 3 1 2 3 GND DEMO MANUAL DC1753B Schematic Diagram 11 dc1753bf A B C D E21 GND 4 3 2 1 WP SCL A1 A2 AUXVCC EEWP EESCL EESDA 7 6 5 5 100nF C50 3V3 8 1 2 3 4 5 6 7 8 9 10 11 12 R84 4.99K R85 4.99K 2 ALERTB 4 SCL E14 SDA OPT OPT R82 E15 SCL 1 FAULTB 2 CTRL 3 ALERTB 4 SDA 5 SHARE_CLK 6 SCL 7 RESETB 8 AUXP 9 UNUSED 10 UNUSED 11 GND 12 GND 13 12V 14 12V J15 DEMO HEADER (M) SDA R81 E13 ALERTB 1206 R86 OPT R90 0 OPT R87 E17 CUSTOMER NOTICE VIN R96 OPT 3V3 E16 SYNC R80 R79 0 OPT OPT 0 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 SCALE = NONE YI S. HZ APPROVALS 1 OPT R94 OFF 2 ON RUN GPIO0B SGND RUN1 E31 RUN1 RUN E33 RUN E20 GPIO0B E19 GPIO1B GPIO1B E25 DATE: N/A SIZE 1 LTC3880EUJ DEMO CIRCUIT 1753B-A/B Monday, July 21, 2014 IC NO. SHEET 2 1 OF 3 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only C46 10nF R77 10 R49 10.0K VDD33 TECHNOLOGY 5 SW1 D6 OPT R95 OPT 1 DUAL-PHASE SINGLE OUTPUT STEP-DOWN DC/DC CONVERTER WITH DIGITAL POWER MANAGEMENT TITLE: SCHEMATIC D9 OPT C NC GPIO0-GPIO1 JP5 3 FAULTB CTRL ALERTB SDA SHARE_CLK SCL RESETB AUXP UNUSED UNUSED GND GND 12V 12V J14 DEMO HEADER (F) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 R83 R70 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. VIN SHARE_CLK SYNC SHARE_CLK Figure 10. Demo Circuit 1753B Dual-Phase, Single-Output, Step-Down DC/DC Converter with Digital Power Management 24LC025-I/ST VSS SDA VCC A0 U5 TO DC1613A AUXP SDA GND SCL LGKPWR ALERTB GPIO_1 OUTEN_0 OUTEN_1 GND AUXSCL AUXSDA J10 3 2 ALL PARTS ON THIS PAGE ARE FOR DEMO BOARD ONLY, NOT NEEDED IN CUSTOMER DESIGN 4 4 1 12 6 3 5 A B C D DEMO MANUAL DC1753B Schematic Diagram dc1753bf 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 E24 VIN ON OFF JP3 LED R50 1.5K 3.3uF 3528 + C36 2 R62 10K 4 VIN 3V3 C37 1uF 1206 8 7 6 5 R68 0.01 GND NC 2 R64 10K Q11 TP0101K R66 10K 3 OUTPUT VIN LT1129CS8-3.3 4 VDD33 1 2 3 4 IOUT TST NOTE: PULSE OUT 10mV / AMP GND SENSE/ADJ GND U6 SHDN C41 0.22uF 0805 R38 49.9 1 E27 3 J11 C35 10uF 1206 +3.3V VOUT R65 30 1W 2512 OPT VOUT OFF ON R61 1.5K C40 1uF 1206 8 7 6 5 GND VIN 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 2 3 4 2 2 SCALE = NONE YI S. HZ APPROVALS OUTPUT LT1129CS8-5 GND SENSE/ADJ NC GND U7 SHDN Q12 2N7002A CUSTOMER NOTICE 2 JP4 EXTVCC_DRV VIN 1 ALERTB 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. VIN GPIO0B D3 GREEN GPIO0B R53 200 +3.3V ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN 4 1 TP0101K Q14 TECHNOLOGY DATE: N/A SIZE 1 LTC3880EUJ DEMO CIRCUIT 1753B-A/B Friday, August 29, 2014 IC NO. SHEET 3 1 OF 3 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only 1 DUAL-PHASE SINGLE OUTPUT STEP-DOWN DC/DC CONVERTER WITH DIGITAL POWER MANAGEMENT TITLE: SCHEMATIC EXTVCC_DRV C49 4.7uF R55 127 D5 ALERTB RED +3.3V Figure 11. Demo Circuit 1753B Dual-Phase, Single-Output, Step-Down DC/DC Converter with Digital Power Management GND DO NOT EXCEED 5% DUTY CYCLE! PULSE IN E23 Q15 RJK0305DPB VOUT 5 1 2 3 DYNAMIC LOAD CIRCUIT 3 1 2 3 4 5 D 1 3 1 1 2 3 2 2 3 1 2 5 A B C D DEMO MANUAL DC1753B Schematic Diagram dc1753bf 13 DEMO MANUAL DC1753B 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 (c) 2004, Linear Technology Corporation 14 Linear Technology Corporation dc1753bf LT 0715 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2015