DEMO MANUAL DC2088A High Density LTC3880 Step-Down DC/DC Converter with Power System Management Description Demonstration circuit 2088A is a high current, high density, two-phase single output synchronous buck converter featuring the LTC3880EUJ, a dual-phase current mode controller. The LTC®3880 has the PMBus interface and power system management functions. The layout of DC2088A is very compact and the total solution is within a 1.0" × 1.0" area. The DrMOS is used on the board for high current, high efficiency. The input range of this board is from 7V to 14V, and the output voltage can be programmed from 0.8V to 1.8V, with an output current up to 50A. The factory default setting for the output is 1.0V. The DC2088A also has an on-board dynamic load circuit, which makes it easy for the customer to evaluate the transient performances. The DC2088A powers up to default settings and produces power based on configuration resistors or NVM without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter aspects of the LTC3880. To fully explore the extensive power system management features of the parts, download the GUI software LTpowerPlay 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: www.linear.com/ltpowerplay For more details and instructions on LTpowerPlay, please refer to “LTpowerPlay for LTC3880 Quick Start Guide”. 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. Performance Summary Specifications are at TA = 25°C SYMBOL PARAMETER CONDITIONS VIN Input Supply Range VOUT Output Voltage Range IOUT Output Current Range fSW Factory Default Switching EFF Peak Efficiency IOUT = 0A TO 50A, VIN = 7.0V to 14V MIN TYP MAX 7 12 14 V 0.8 1.0 1.8 V 50 A 0 VOUT = 1.0V, See Figures 4. UNITS 425 kHz 87.8 % dc2088af 1 DEMO MANUAL DC2088A Quick Start Procedure Demonstration circuit 2088A makes it easy to set up to evaluate the performances of the LTC3880. Refer to Figure 2 for proper measurement equipment setup and follow the procedure below: 3. Make sure RUN switch (SW) is OFF. 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 C14. See Figure 3 for proper scope probe technique. 5. Turn on RUN switch as desired. 1. Make sure jumpers are in the following positions: JUMPER POSITION FUNCTION JP1 ON Drives ON JP2 OFF LED 2. With power off, connect the input power supply to VIN and GND. Connect active load to the output. 2 4. Turn on the power at the input. NOTE. Make sure that the input voltage does not exceed 16V. 6. Check for the correct output voltage from E4 to E6. VOUT = 1.0V ± 0.5% (1.005V ~ 0.995V) 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 voltage is established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. 8. Connect the dongle and control the output voltages from the GUI. See “LTpowerPlay QUICK START” session for details. dc2088af DEMO MANUAL DC2088A Quick Start Procedure CONNECTING A PC TO DC2088A 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, sequenc- ing parameters, the fault log, fault responses, GPIO and other functionality. The DC1613A dongle may be plugged in regardless of whether or not VIN is present. The Dongle can be hot plugged. +12V POWER SUPPLY USB CABLE VIN USB TO 12C/PMBus DONGLE DC1613A 12-PIN CONNECTOR VOUT DEMO BOARD DC2088A LOAD dc2088a F01 Figure 1. Demo Setup with PC DC1613A CONNECTOR RUN SWITCH + + – + VIN – VOUT + SHUNT – + LOAD POWER SUPPLY IIN – – dc2088a F02 Figure 2. Power Test Setup dc2088af 3 DEMO MANUAL DC2088A Quick Start Procedure MEASURING EFFICIENCY (See Figure 2) EVALUATING THE LTC3880-1 • To accurately measure efficiency of any configuration, do the following: For applications that require the highest possible efficiency, the LTC3880-1 allows the user to supply the bias voltage and gate driver current from an external power supply. Please install R4 (0Ω). Then, the 5V gate drive for the DrMOS will also provide power to the EXTVCC. • Set JP1, JP2 to OFF position to disable all the auxiliary circuits. • Make sure R4, R10 not stuffed. • Provide an external 5V for the gate drive, and connect it to E15 and E16. • Measure VIN across the input ceramic capacitor (C29). Measure VOUT across the output ceramic capacitor (C14). Add the driver loss (VDR • IDR) to the total efficiency calculation. To accurately measure efficiency of a demo board containing the LTC3880-1, • Set JP1, JP2 to OFF to disable the LDO. • Connect an external 5V power supply to E15, E16. • Measure VIN across the input ceramic capacitor (C29). Measure VOUT across the output ceramic capacitor (C14). MEASURING OUTPUT RIPPLE VOLTAGE An accurate ripple measurement may be performed by using the below configuration across C16. + VOUT – COUT GND Figure 3. Measuring Output Voltage Ripple 4 dc2088af DEMO MANUAL DC2088A Quick Start Procedure 90 89 EFFICIENCY (%) 88 87 86 85 84 83 12VIN 1.0VOUT 425kHz 82 12VIN 0.9VOUT 425kHz 81 12VIN 1.2VOUT 425kHz 80 0 10 20 30 40 50 60 LOAD CURRENT (A) dc2088a F04 Figure 4. Typical Efficiency Curves DC2088A, 12VIN, fSW = 425kHz, VOUT = 1.2V, 1.0V, 0.9V LTpowerPlay Software GUI LTpowerPlay is a powerful Windows based development environment that supports Linear Technology power system management ICs, including the LTC3880, LTC3883, LTC2974 and LTC2978. 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 LTC3880’s DC2088A 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: www.linear.com/ltpowerplay To access technical support documents for LTC Digital Power Products visit Help. View online help on the LTpowerPlay menu. dc2088af 5 DEMO MANUAL DC2088A Quick Start Procedure Figure 3. Measuring Output Voltage Ripple LTpowerPlay QUICK START PROCEDURE 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 DC2088A. The system tree on the left hand side should look like this: 6 dc2088af DEMO MANUAL DC2088A Quick Start Procedure b. A green message box shows for a few seconds in the lower left hand corner, confirming that the LTC3880 and the LTC3883 are communicating: Then, click the “W” (PC to RAM) icon to write these register values to the LTC3880 and the LTC3883. After finishing this step, you will see the output voltage will change to 1.5V. If the write is successful, you will see the following message: c. In the Toolbar, click the “R” (RAM to PC) icon to read the RAM from the LTC3880 and the LTC3883. This reads the configuration from the RAM of LTC3883 and loads it into the GUI. d. If you want to change the output voltage to a different value, like 1.5V. In the Config tab, type in 1.5 in the VOUT_COMMAND box, like this: e. You can save the changes into the NVM. In the tool bar, click “RAM to NVM” button, as following f. Save the demo board configuration to a (*.proj) file. Click the Save icon and save the file. Name it whatever you want. dc2088af 7 DEMO MANUAL DC2088A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 4 C1, C2, C28, C29 CAP., X5R, 22µF, 25V, 10%,1210 AVX, 12103D226KAT 2 2 C5, C30 CAP., X5R, 1µF, 10V, 20%, 0603 AVX, 0603ZD105MAT2A 3 6 C4, C10, C11, C16, C27, C36 CAP., X5R, 1µF, 10V, 20%, 0402 AVX, 0402ZD105MAT2A 4 1 C6 CAP., X5R, 10µF, 10V, 20%, 0603 SAMSUNG, CL10A106MP8NNNC 5 3 C3, C9, C26 CAP., X7R, 0.1µF, 25V, 10%, 0603 AVX, 06033C104KAT 6 2 C7, C8 CAP., OS-CON, 330µF, 16V, 20% SANYO, 16SVP330M 7 20 C12-C15, C17, C31-C35, C43-C52 CAP., X5R, 100µF, 6.3V, 20%,1206 TAYO YUDEN, JMK316BJ107ML-T 8 2 C18, C19 CAP., POSCAP, 470µF, 2.5V, D2E SANYO 2R5TPE470M9 9 2 C22, C37 CAP., X5R, 0.22µF, 16V, 20%, 0402 TDK, C1005X5R1C224M 10 1 C23 CAP., X7R, 1nF, 25V, 10%, 0402 AVX, 04023C102KAT2A 11 1 C24 CAP., NPO, 100pF,25V, 10%, 0402 AVX,04023A101KAT2A 12 1 C25 CAP., X5R, 10nF, 25V, 10%, 0402 AVX, 04023D103KAT2A 13 2 L1, L2 INDUCTOR, SMT POWER IND. 0.16µH COILCRAFT., XAL7070-161ME 14 1 Q1 TRANS GP SS PNP 40V SOT-23 ON SEMI MMBT3906LT1G 15 1 Q3 MOSFET P-CH 20V, 0.58A, SOT-23 VISHAY, TP0101K-T1-E3 16 6 R2, R11, R12, R16, R17, R30 RES., CHIP, 0, 1%, 0402 VISHAY, CRCW04020000Z0ED 17 4 R1, R13, R36, R66 RES., CHIP, 0, 1%, 0603 VISHAY, CRCW06030000Z0EA 18 2 R3, R15 RES., CHIP, 10, 1%, 0603 VISHAY, CRCW060310R0FKEA 19 2 R7, R19 RES., CHIP, 10k, 1%, 0402 VISHAY, CRCW040210K0FKED 20 5 R18, R20, R22, R24, R39 RES., CHIP, 10k, 1%, 0603 VISHAY, CRCW060310K0FKEA 21 1 R6 RES., CHIP, 1, 1%, 0402 VISHAY, CRCW04021R00FKED 22 4 R8, R9, R25, R27 RES., CHIP, 825, 1%, 0402 VISHAY, CRCW0402825RJNED 23 1 R14 RES., CHIP, 6.81k, 1%, 0402 VISHAY, CRCW04026K81FKED 24 1 R23 RES., CHIP, 20k, 1%, 0402 VISHAY,CRCW040220K0FKED 25 1 R28 RES., CHIP, 17.8k, 1%, 0402 VISHAY,CRCW040217K8FKED 26 1 R31 RES., CHIP, 16.2k, 1%, 0603 VISHAY, CRCW060316K2FKEA 27 1 R33 RES., CHIP, 24.9k, 1%, 0603 VISHAY, CRCW060324K9FKEA 28 1 R34 RES., CHIP, 4.32k, 1%, 0603 VISHAY, CRCW06034K32FKEA 29 1 R40 RES., CHIP, 15.8k, 1%, 0603 VISHAY, CRCW060315K8FKEA 30 2 U1, U3 IC, HIGH FREQUENCY DrMOS MOUDLE FAIRCHILD, FDMF6823A 31 1 U2 IC, LTC3880EUJ, QFN 6mm × 6mm LTC., LTC3880EUJ#PBF Additional Circuit Components 1 2 CBYP1, CBYP2 CAP., X7R, 0.01µF,16V, 10%, 0603 AVX, 0603YC103KAT 2 2 COUT1, COUT2 CAP., X5R, 10µF,25V, 20%,1206 TDK, C3216X7R1E106M 3 1 C40 CAP., X7R, 1µF, 16V, 10%, 1206 AVX, 1206YC105KAT 4 1 C41 CAP., X7R, 0.1µF, 25V, 10%, 0603 AVX, 06033C104KAT 5 1 C39 CAP., X5R, 1µF, 16V, 20%, 0805 AVX, 0805YD105MAT 6 0 C20, C21, C53, C54 CAP., POSCAP, 470µF, 2.5V, D2E SANYO 2R5TPE470M9 7 1 C38 CAP., X5R, 2.2µF, 16V, 10%, 0805 AVX, 0805YD225KAT 8 1 C42 CAP., X5R, 10nF, 25V, 10%, 0603 AVX, 06033D103KAT 9 1 C55 CAP., X7R, 0.1µF,16V, 10%, 0603 AVX, 0603YC104KAT 8 dc2088af DEMO MANUAL DC2088A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 10 11 1 D1 LED GREEN S-GW TYPE SMD ROHM, SML-010FTT86L 1 D2 LED RED S-TYPE GULL WING SMD ROHM, SML-010VTT86L 12 1 D3 DIODE, SCHOTTKY, SOD-323 CENTRAL CMDSH-3TR 13 1 Q2 MOSFET SPEED SRS 30V 30A LFPAK RENESAS, RJK0305DPB-00#J0 14 1 Q3 MOSFET P-CH 20V 0.58A SOT-23 VISHAY, TP0101K-T1-E3 15 1 Q5 MOSFET N-CH 60V 115MA SOT-23 FAIRCHILD, 2N7002A-7-F 16 7 R54-R60 RES., CHIP, 0, 1%, 0603 VISHAY, CRCW06030000Z0EA 17 1 R51 RES., CHIP, 10, 1%, 0603 VISHAY, CRCW060310R0FKEA 18 2 R38, R48 RES., CHIP, 10k, 1%, 0603 VISHAY, CRCW060310K0FKEA 19 2 R43, R44, RES., CHIP, 100k, 1%, 0603 VISHAY, CRCW0603100KFKEA 20 1 R10 RES., CHIP, 30, 1%, 2512 VISHAY, CRCW251230R0FKEA 21 0 R21, R62, R63 (OPT) RES., 0402 22 0 R4, R5, R26, R29, R32, R35 (OPT) RES., 0603 23 0 R47 (OPT) RES., 0805 24 1 R37 RES., CHIP, 200, 1%, 0603 VISHAY, CRCW0603200RFKEA 25 1 R41 RESISTOR .010Ω 1W, 1% 2512 PANASONIC, ERJ-M1WSF10MU 26 1 R42 RES., CHIP, 127, 1%, 0603 VISHAY, CRCW0603127RFKEA 27 2 R45, R46 RES., CHIP, 4.99k, 1%, 0603 VISHAY, CRCW06034K99FKEA 28 1 R49 RES., CHIP, 6.19k, 1%, 0603 VISHAY, CRCW06036K19FKEA 29 1 R50 RES., CHIP, 3.4k, 1%, 0603 VISHAY, CRCW06033K40FKEA 30 2 R52, R53 RES., CHIP, 2k, 1%, 0603 VISHAY, CRCW06032K00FKEA 31 1 U4 IC, SERIAL EEPROM MICROCHIP 24LC025-I/ST 32 1 U5 IC, LT3029IMSE, MSOP, 16 PIN LTC., LT3029IMSE#PBF 1 8 E1, E2, E4, E6, E11, E12, E15, E16 TESTPOINT, TURRET, .062" MILL-MAX, 2308-2-00-80-00-00-07-0 2 2 J1, J2 JACK, BANANA KEYSTONE 575-4 3 2 J3, J4 STUD, TEST PIN PEM KFH-032-10 4 4 J3, J4(X2) NUT, BRASS 10-32 ANY #10-32 5 2 J3, J4 RING, LUG #10 KEYSTONE, 8205, #10 6 2 J3, J4 WASHER, TIN PLATED BRASS ANY #10 7 2 J5, J7 CONN, BNC, 5-PINS CONNEX, 112404 8 1 J6 CONN HEADER 12POS 2mm STR DL PCB FCI 98414-G06-12ULF 9 1 J8 HEADER., DOUBLE ROW, RIGHT ANGLE 2 × 5 PIN MILL-MAX 802-40-010-20-001000 10 1 J9 SOCKET, DOUBLE ROW, 2 × 5 PIN MILL-MAX 803-43-010-20-001000 11 2 JP1, JP2 HEADER 3 PIN 0.079 SINGLE ROW SULLIN, NRPN031PAEN-RC 12 2 JP1, JP2 SHUNT SAMTEC, 2SN-BK-G 13 1 SW SWITCH SLIDE 1PDT 6VDC 0.3A SMT C & K JS102011SAQN 14 4 STANDOFF STANDOFF, SNAP ON KEYSTONE_8831 15 1 STENCIL STENCIL Hardware dc2088af 9 A B C VDD25 VDD33 GND GND VIN 7V-14V E2 J2 R35 OPT R33 24.9k R31 16.2k R29 OPT R26 OPT R24 10k R22 10k R20 10k R18 10k E1 J1 WP GPIO1B GPIO0B R36 0 5 VTRIM_CFG R34 4.32k VOUT_CFG R32 17.4k FREQ_CFG R66 0 ALERTB SDA SCL + C7 330uF 16V SVP + C8 330uF 16V SVP VIN R17 0 VDD33 R14 6.81K C23 1nF Q1 24 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. 2. INSTALL SHUNTS AS SHOWN. NOTE: UNLESS OTHERWISE SPECIFIED R28 17.8K R23 20K VDD25 17 16 23 14 15 40 28 5 26 11 8 WP RUN 9 10 SHARE_CLOCK C25 10nF ITH SHARE_CLOCK R19 10K ADDRESS: 0X4B C24 100pF ALERTB SYNC_A SDA SCL R7 10k VDD33 1 FREQ_CFG ASEL SC WP RUN0 RUN1 TSNS0 TSNS1 ITH0 ITH1 ALERT SYNC SDA SCL R6 4 C9 100nF 35 U2 LTC3880EUJ TG0 ISNS0- ISNS0+ BG0 SW0 BOOST0 VSENSE1 ISNS1- ISNS1+ BG1 SW1 BOOST1 TG1 VSENSE0- VSENSE0+ VDD33 C11 1uF VDD33 C10 1uF INTVCC VDD25 INTVCC VDD25 22 VIN FREQ_CFG 33 INTVCC 25 VDD33 R30 0 GPIO1B SGND AND PGND CONNECTED AT GPIO0B A SINGLE NODE NEAR U2 27 4 3 32 29 31 30 2 1 7 6 36 39 37 38 C6 10uF BG0 BG1 R4 OPT VDR VIN VIN 3 C2 22uF 1210 C28 22uF 1210 C1 22uF 1210 3 PGND PGND PGND PGND PGND VSWH VIN VIN VIN VIN 20 19 18 17 16 15 14 13 12 11 PGND PGND PGND PGND PGND VSWH VIN VIN VIN VIN C29 22uF 1210 20 19 18 17 16 15 14 13 12 11 C3 100nF 7 C26 100nF R1 6 U1 FDMF6823A PHASE D 18 VOUT0_CFG VOUT0_CFG VOUT1_CFG 19 VIN VTRIM1_CFG 21 VTRIM0_CFG 20 VTRIM_CFG GPIO1 VDD25 GND 41 PGND 34 GPIO0 12 4 PGND 21 13 PGND 21 10 9 42 8 VIN VIN VIN NC C4 1uF 16V 0 5 41 CGND GND 10 9 42 8 VIN VIN VIN NC PGND 22 PGND 23 7 C27 1uF 16V R13 0 U3 FDMF6823A PHASE PGND 23 PGND 22 GH PGND 24 PGND 26 5 41 4 27 4 PGND 25 6 GH R3 10 VDR 1 C30 1uF VDR R15 10 PWM VSWH VSWH VSWH VSWH VSWH GL CGND NC DISB# PWM 31 32 33 34 35 36 37 38 39 40 BG0 31 32 33 34 35 36 37 38 39 40 BG1 VSWH VSWH VSWH VSWH VSWH GL CGND NC DISB# C5 1uF CGND GND 26 PGND 24 2 VCIN PGND 27 PGND 25 BOOT PGND BOOT PGND 2 VCIN VDRV PGND 3 SMOD# 3 VDRV PGND 28 VSWH VSWH VSWH 43 29 30 1 SMOD# VSWH VSWH VSWH 28 10 43 29 30 5 L1 L2 0 0.22uF R9 825 C37 C49 100uF 1210 C31 100uF 1210 C51 100uF 1210 C32 100uF 1210 C43 100uF 1210 C13 100uF 1210 C52 100uF 1210 C33 100uF 1210 C46 100uF 1210 C17 100uF 1210 C50 100uF 1210 C34 100uF 1210 C45 100uF 1210 C14 100uF 1210 C48 100uF 1210 C35 100uF 1210 C44 100uF C15 100uF 1210 2 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE 1uF C36 C47 100uF 1210 C12 100uF 1210 VOUT OPT HZ SCALE = NONE YI S. 0 OPT R12 R62 + 1 VSNSN VSNSP C20 OPT + VOUT R10 30 1W J4 E6 E4 J3 VOUT- VOUT+ GND VOUT YI S. DATE 2-13-13 DATE: N/A SIZE DEMO CIRCUIT 2088A LTC3880EUJ 1 Monday, May 20, 2013 IC NO. SHEET 1 1 REV. OF 2 HIGH DENSITY DC / DC CONVERTER WITH POWER SYSTEM MANAGEMENT 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only C21 OPT + PRODUCTION APPROVED REVISION HISTORY DESCRIPTION TECHNOLOGY C18 C19 470uF 470uF + 1 REV TITLE: SCHEMATIC R21 C54 470uF C53 470uF 0 + __ ECO + R11 APPROVALS 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. 0.22uF 1uF C16 GPIO0B GPIO0B R25 825 0.16uH R16 R27 825 0 0.16uH C22 R8 825 R2 R63 OPT R5 OPT 2 A B C D DEMO MANUAL DC2088A Schematic Diagram dc2088af 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 SDA SCL WP VCC 5 6 7 8 MILL MAXX DNI DNI DNI SYNC SHARE_CLK RUN GPIO SDA SCL GND RIGHT ANGLE HEADER 24LC025-I/ST VSS A2 A1 A0 U4 1 2 3 4 5 6 7 8 9 10 11 12 5 802-40-008-20-001000 J8 4 3 2 1 TO DC1613A AUXP SDA GND SCL LGKPWR ALERTB GPIO_1 OUTEN_0 OUTEN_1 GND AUXSCL AUXSDA J6 3V3 4 10 7 6 5 4 3 2 1 10 SHARE_CLK SYNC OFF ON 9 EXT DRIVER 9 SCL SDA GPIO0B RUN R46 4.99K DNI DNI DNI SYNC SHARE_CLK RUN GPIO SDA SCL GND J9 E16 E15 RIGHT ANGLE SOCKET GND C55 VDR 0.1uF D3 MILL MAXX 803-43-008-20-001000 2 R43 100K 8 R60 0 R59 0 R58 0 R57 0 R56 0 R55 0 R54 0 EESDA EESCL R45 4.99K JP1 8 7 6 5 4 3 2 1 100nF AUXVCC C41 VIN PULSE IN 1206 COUT2 10uF VDR GND VIN E12 R52 2K R49 6.19K CBYP1 0.01uF C40 1uF U5 LT3029IMSE DO NOT EXCEED 5% DUTY CYCLE! E11 16 1 3 4 15 R41 0.01 2512 ADJ1 BYP1 VOUT1 VOUT1 SHDN1 VIN 10K R38 4 Q2 RJK0305DPB DYNAMIC LOAD CIRCUIT 3 C38 2.2uF 0805 VOUT ADJ2 BYP2 VOUT2 VOUT2 SHDN2 J5 VOUT J7 9 8 6 7 10 R53 2K R50 3.4K IOUT TST VOUT CBYP2 0.01uF NOTE: PULSE OUT 10mV / AMP C39 1uF 0805 1 1 2 3 4 5 2 3 4 5 SCL SDA 3 2 OFF ON R44 100K Q3 TP0101K R39 10K 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 2 R40 15.8K 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. CUSTOMER NOTICE JP2 LED COUT1 10uF 1206 +5V VIN VIN 3V3 2 1 ALERTB 4 1 3 1 2 GPIO0B YI S. APP ENG. SCALE = NONE HZ PCB DES. APPROVALS VDD33 SW RUN OFF ON 2 R47 OPT C42 10nF R51 10 R48 10K VDD33 ALERTB 1 D2 RED ALERT TP0101K Q4 R42 127 +5V DATE: N/A SIZE 1 DEMO CIRCUIT 2088A LTC3880EUJ Monday, May 20, 2013 IC NO. SHEET 2 1 OF 2 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 HIGH DENSITY DC / DC CONVERTER WITH POWER SYSTEM MANAGEMENT TECHNOLOGY Q5 2N7002A GREEN GPIO0B TITLE: SCHEMATIC RUN GPIO0B 1 D1 R37 200 +5V 3 2 5 1 2 3 14 VIN1 12 VIN2 13 VIN1 NC 2 GND 5 1 3 11 VIN2 GND 17 1 3 2 3 5 A B C D DEMO MANUAL DC2088A Schematic Diagram dc2088af 11 DEMO MANUAL DC2088A 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 dc2088af LT 0114 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2014