DEMO MANUAL DC1978A LTC2974 Quad Digital Power Supply Manager with EEPROM DESCRIPTION The DC1978A is a demonstration system for the LTC®2974 quad I2C/SMBus/PMBus power supply monitor and controller with EEPROM. The DC1978A demonstrates the ability of the LTC2974 to monitor, supervise, sequence, trim, margin and log faults for four power supplies. Each power supply channel of the LTC2974 monitors current, voltage and temperature. This demonstration system is supported by the LTpowerPlay™ graphical user interface (GUI) that enables complete control of all LTC2974 features. The DC1978A consists of two circuit boards designed to work as a pair, DC1809A and DC1810A. The DC1809A contains all the circuitry needed to insert the LTC2974 into a power system and control four power supplies. The DC1810A contains four power supplies, two LTC3860 DrMOS supplies and two LTM®4620 supplies, which are configured to be controlled by the LTC2974. Together, these two boards form a sophisticated four-channel digitally programmable power supply. Together, the LTpowerPlay software and DC1978A hardware system create a powerful development environment for designing and testing LTC2974 configuration settings. These settings can be stored in the LTC2974 internal EEPROM or in a file. This file can later be used to order preprogrammed devices or to program devices in a production environment. The LTpowerPlay software displays all of the configuration settings and real time measurements from the LTC2974. Telemetry allows easy access and decoding of the fault log created by the LTC2974. The LTC2974 on the DC1809A board comes preprogrammed with the EEPROM values appropriate for the four power supplies used on the DC1810A. Just plug and play! Multiple DC1978A board sets can be cascaded together to form a high channel count power supply (see Multiboard Arrays). This cascaded configuration demonstrates features of the LTC2974 which enable timing and fault information to be shared across multiple LTC2974s allowing for the formation of a single, coherent power supply control system. This cascaded configuration is supported by the LTpowerPlay GUI and allows the user to configure up to nine LTC2974s, thereby controlling up to 36 separate power supplies. Larger arrays (>9) of LTC2974s are supported through programmable I2C base address or bus segmentation. The DC1809A/DC1810A boards are powered by an external 12V power supply. Communication with the LTpowerPlay software is via the DC1613 USB to I2C/SMBus/PMBus controller. The following is a checklist of items which can be obtained from the LTC website or LTC Field Sales. • USB to I2C/PMBus Controller (DC1613) • LTpowerPlay Software • Configuration File (.proj file) for the DC1978A Design files for this circuit board are available at http://www.linear.com/demo LTC2974 Features • I2C/SMBus Serial Interface • PMBus Compliant Command Set • Configuration EEPROM with CRC • Black Box Fault Logging to Internal EEPROM • Differential Input, 16-Bit ΔΣ ADC with Less Than ±0.25% of Total Unadjusted Error • Four Voltage Servos Precisely Adjust Supply Voltages Using 10-Bit DACs with Soft Connect • Monitors Four Output Voltages, Four Output Currents and One Input Voltage • Monitors Four External Temperature Sensors and Internal Die Temperature • 4-Channel Sequencer, Time Based or Tracking • Programmable Watchdog Timer L, LT, LTC, LTM, μModule, PolyPhase, 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. Protected by U.S. Patents Including 7382303 and 7420359. dc1978af 1 DEMO MANUAL DC1978A DESCRIPTION • Four OV/UV VOUT and One VIN Supervisor • Operates Autonomously without Additional Software • Four Overcurrent/Undercurrent Supervisors • Powered from 3.3V or 4.5V to 15V • Supports Multichannel Fault Management • Available in 64-Lead 9mm × 9mm QFN PERFORMANCE SUMMARY PARAMETER Specifications valid over full operating temperature range. CONDITIONS MIN VPWR Supply Input Voltage Range TYP 4.5 VDD33 Supply Input Voltage Range VIN_ADC ≥ 1V ADC Voltage Sensing Input Range Differential Voltage: VIN_ADC = (VSENSEP[n] – VSENSEM[n]) VSENSEM[n] 0 –0.1 ADC Voltage Sensing Resolution ISENSEP[n], ISENSEM[n] Differential Voltage: VIN_ADC = (ISENSEP[n] – ISENSEM[n]) ADC Current Sense Resolution RSENSE(IOUT_CAL_GAIN) = 1Ω 0mV ≤ |VIN_ADC| < 16mV 16mV ≤ |VIN_ADC| < 32mV 32mV ≤ |VIN_ADC| < 63.9mV 63.9mV ≤ |VIN_ADC| < 127.9mV 127.9mV ≤ |VIN_ADC| –0.1 –170 3.47 V ±0.25 % 6 0.1 V V μV/LSB 6 170 V mV 15.265 31.25 62.5 125 250 Trim DAC Resolution μA/LSB μA/LSB μA/LSB μA/LSB μA/LSB 10 Bits Buffer Gain Setting 0 (MFR_CONFIG(dac_gain) = 0) Buffer Gain Setting 1 (MFR_CONFIG(dac_gain) = 1) Temperature Sensor Resolution Voltage Supervisor Input Voltage Range Low Resolution, VIN_VS = (VSENSEP[n] – VSENSEM[n]) High Resolution, VIN_VS = (VSENSEP[n] – VSENSEM[n]) VSENSEM[n] Voltage Supervisor Sensing Resolution 0V to 3.8V Range 0V to 6V Range Voltage Supervisor Total Unadjusted Error 2V < VIN_VS < 6V, Low Resolution Mode 1.5V < VIN_VS < 3.8V, High Resolution Mode 0.8V < VIN_VS < 1.5V, High Resolution Mode Current Supervisor Input Range V 122 ADC Current Sense Input Range Trim DAC Full Scale Output Voltage UNITS 15 3.13 ADC Total Unadjusted Error MAX 1.38 2.65 V V 0.136 °C/LSB 0 0 –0.1 6 3.8 0.1 V V V 4 8 mV/LSB mV/LSB ±1.25 ±1.0 ±1.5 ISENSEP[n], ISENSEM[n] –0.1 6 Differential Voltage: VIN_CS = (ISENSEP[n] – ISENSEM[n])) –170 170 Current Supervisor Resolution IOUT_xC_FAULT_LIMIT × IOUT_CAL_GAIN Current Supervisor Total Unadjusted Error 50mV ≤ VIN_CS ≤ 170mV VIN_CS < 50mV % % % V mV 400 I2C Serial Clock Frequency 10 μV/LSB ±3 ±1.5 % mV 400 kHz DC1978A DEMO SYSTEM SPECIFICATIONS DC1978A Power Supply Specifications POWER SUPPLY CHANNEL Controller Nominal Untrimmed Output Voltage Rated Output Current Output Trim Range (VDAC_FS = 1.38V) CH0 CH1 CH2 CH3 LTC3860, VOUT1 LTC3860, VOUT2 LTM4620, VOUT1 LTM4620, VOUT2 1.8V ± 2.1 % 1.5V ± 2.1 % 1.2V ± 2.1 % 1.0V ± 2.1 % 2A 2A 5A 5A 13/–19 % 11 /–15% 16/–21 % 16/–21 % dc1978af 2 DEMO MANUAL DC1978A LTpowerPlay GUI SOFTWARE LTpowerPlay is a powerful Windows based development environment that supports Linear Technology digital power ICs with EEPROM, including the LTC2974 and LTC2978 quad and octal PMBus power supply managers, and the LTC3880 dual output PolyPhase® step-down DC/DC controller with digital power system management. 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. DC1978a F01 Figure 1. Interface of the LTpowerPlay GUI dc1978af 3 DEMO MANUAL DC1978A QUICK START PROCEDURE The following procedure describes how to set up a DC1978A demo system. 4. Confirm that all jumpers and switches on DC1810A are set to their defaults as follows. 1. Download and install the LTpowerPlay GUI: http://linear.com/ltpowerplay a. Set JP1, JP2 and JP3 to SOFT-START to enable independent startup of CH1, CH2 and CH3. 2. Remove both boards from the ESD protective bags and place them on a level surface. Connect the boards together using the 50-pin edge connector. Be especially careful not to misalign the connectors. Connect the DC1613 I2C/SMBus/PMBus controller to the DC1809A board. b. Set the preload switches SW1, SW2, SW3 and SW4 to ON. 3. Confirm that all jumpers and switches on DC1809A are set to their defaults as follows: a. Set both JP1 and JP2 (Address select ASEL0 and ASEL1) to LOW to select I2C address 0x5C. b. Set JP3 (WRITE PROTECT) to OFF to enable writing to the LTC2974 EEPROM. 5. Plug the USB to I2C/SMBus/PMBus Controller into a USB port on your PC. 6. Connect a 12V power supply with > 0.5A capacity to the VIN input of the DC1810A. The board should power up and all power good outputs should be illuminated green. 7. Launch the LTpowerPlay GUI. a. The GUI should automatically indentify the LTC2974. The system tree on the left hand side should look like this: c. Set the control jumpers JP4 to JP7 to SW0 to SW3 position to connect the switches to the LTC2974 control pins. d. Set all control switches SW0, SW1, SW2 and SW3 to HI. DC1978a F02 Figure 2. Connecting DC1809A/DC1810A Boards and the DC1613 I2C/SMBus/PMBus Controller dc1978af 4 DEMO MANUAL DC1978A QUICK START PROCEDURE b. A green message box shows for a few seconds in the lower left hand corner, confirming that the LTC2974 is communicating: 9. You are now ready to view one of the LTC2974 demo videos embedded in the LTpowerPlay GUI or experiment with the part on your own. To view a video or more LTC2974 information and application notes, visit the LTpowerPlay online help website from the GUI as shown here: c. In the Toolbar, click the R icon to read the RAM from the LTC2974. This reads the configuration from the RAM of LTC2974 and loads it into the GUI. LOADING A LTC2974 CONFIGURATION (*.proj) FILE WITH THE GUI d. Save the demo board configuration to a (*.proj) file. Click the Save icon and save the file. Name it whatever you want. 1. In the upper left hand corner of the GUI, File > Open > browse to your *.proj file. This will load the file into the GUI. 2. Click on the arrow. This loads the configuration into LTC2974 RAM. 3. To store the configuration in EEPROM, click on the STORE button. It is the button on the left below. 8. The control switches SW0 to SW3 are configured to control channels CH0 to CH3. Slide the switches to HI/ GND to enable/disable the individual channels. dc1978af 5 DEMO MANUAL DC1978A DC1978A DETAILS TOP SIDE DC1978a F03 Figure 3. DC1978A Top Details dc1978af 6 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS SELECTING I2C ADDRESS DC1978A LEDS The I2C/SMBus address of the LTC2974 equals the base address + N, where N is a number from 0 to 8. N can be configured by setting the ASEL0 and ASEL1 pins to VDD33, GND or FLOAT. See Table 3. Using one base address and the nine values of N, nine LTC2974s can be connected together to control thirty six outputs. The base address is stored in the MFR_I2C_BASE_ADDRESS register. The base address can be written to any value, but generally should not be changed unless the desired range of addresses overlap existing addresses. Watch that the address range does not overlap with other I2C/SMBus device or global addresses, including I2C/SMBus multiplexers and bus buffers. The red LEDs on ALERTB, FAULTB0, FAULTB1 and AUXFAULTB (D3, D4, D5, D2) indicate a fault has occurred. The green LED (D6) next to them is the LTC2974 PWRGD signal. Each individual channel on DC1810A also has its own green PWR GOOD LED (PG0, PG1, PG2, PG3). When the USB to I2C/SMBus/PMBus controller power or external power is applied, the green LED D1 will illuminate, indicating that the LTC2974 is powered. FAULTING AN OUTPUT The outputs of the power supplies CH0 to CH3 may be shorted indefinitely. This is a good way to induce UV faults. Use a jumper wire or a coin to short any output. RESET THE LTC2974 To reset the LTC2974 and reload the EEPROM contents into operating memory (RAM), press SW4 on DC1809A. Table 3. Device Address Lookup Table ADDRESS DESCRIPTION HEX DEVICE ADDRESS BINARY DEVICE ADDRESS BITS ADDRESS PINS 7-Bit 8-Bit 6 5 4 3 2 1 0 R/W ASEL1 ASEL0 0C 19 0 0 0 1 1 0 0 1 X X GLOBAL 5B B6 1 0 1 1 0 1 1 0 X X N=0 5C* B8 1 0 1 1 1 0 0 0 L L N=1 5D BA 1 0 1 1 1 0 1 0 L NC N=2 5E BC 1 0 1 1 1 1 0 0 L H N=3 5F BE 1 0 1 1 1 1 1 0 NC L N=4 60 C0 1 1 0 0 0 0 0 0 NC NC N=5 61 C2 1 1 0 0 0 0 1 0 NC H N=6 62 C4 1 1 0 0 0 1 0 0 H L N=7 63 C6 1 1 0 0 0 1 1 0 H NC N=8 64 C8 1 1 0 0 1 0 0 0 H H ALERT RESPONSE H = Tie to VDD33, NC = No Connect = Open or Float, L = Tie to GND, X = Don’t Care * MFR_I2C_BASE_ADDRESS = 7-Bit 0x5C (Factory Default) dc1978af 7 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS FAULT SHARING SETUP IN THE GUI TRACKING BASED SEQUENCING Use the fault sharing setup tool to configure the fault sharing in the GUI. Before doing so, view the fault sharing demo in the GUI. Go to Tools > Fault Sharing Diagram. Also, read the section on fault sharing in the data sheet. The LTC2974 supports tracking power supplies that are equipped with a tracking pin and configured for tracking. A tracking power supply uses a secondary feedback terminal (TRACK) to allow its output voltage to be scaled to an external master voltage. Typically, the external voltage is generated by the supply with the highest voltage in the system, which is fed to the slave track pins (see Figure 6). Any supplies that track a master supply must be enabled before the master supply comes up and disabled after the master supply comes down. Enabling the slave supplies “WHY AM I OFF?” TOOL Use the “Why am I Off?” tool in the LTpowerPlay GUI to diagnose the reason a power supply channel is turned off. The tool can be located in the top right corner of the GUI, next to the Register Information tab. DC1978a F04 Figure 4. Fault Sharing Utility in LTpowerPlay GUI DC1978a F05 Figure 5. “Why am I Off?” tool in the LTpowerPlay GUI dc1978af 8 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS when the master is down requires supervisors monitoring the slaves to disable UV detection. Slave UC detection must also be disabled when the slaves are tracking the master down to prevent false UC events. All channels configured for tracking must track off together in response to a fault on any channel or any other condition that can bring one or more of the channels down. Prematurely disabling a slave channel via its run pin may cause that channel to shut down out of sequence. The LTC2974 supports the following tracking features: • Track channels on and off without issuing false UV/ UC events when the slave channels are tracking up or down. • Ability to reconfigure selected channels that are part of a tracking group to sequence up after the group has tracked up or sequence down before the group has tracked down. To demonstrate the tracking features of LTC2974, DC1810A has three jumpers (JP1, JP2 and JP3) that can be set to connect resistive dividers from the 1.8V master supply (CH0) to the TRACK pins of channels 1 to 3. The required timing settings and diagrams in order to enable tracking with LTC2974 are listed in the data sheet, and a brief summary is shown below: Master channel 0 • Track all channels down in response to a fault from a slave or master. • TON_DELAY = Ton_delay_master • Track all channels down when VIN_SNS drops below VIN_OFF, share clock is held low or RESTORE_USER_ ALL is issued. • TOFF_DELAY = Toff_delay_master • TON_RISE = Ton_rise_master • Mfr_track_en_chan0 = 0 LTC2974 CONTROL0 FAULTB0 CONTROL0 PWRGD FAULTB0 VSENSEP0 VOUT_EN0 VSENSEM0 VDAC0 RUN VFB VOUTP DC/DC VOUTM TRACK VSENSEP1 VOUT_EN1 VSENSEM1 VDAC1 RUN VFB VOUTP DC/DC VSENSEP2 VOUT_EN2 VSENSEM2 VDAC2 VFB VOUTP DC/DC VOUT_EN3 VSENSEM3 VDAC3 VSENSEP2 VSENSEM2 R2_2 RUN VFB TRACK R1_3 VSENSEM1 LOAD VOUTM TRACK VSENSEP3 VSENSEP1 R2_1 RUN R1_2 VSENSEM0 LOAD VOUTM TRACK R1_1 VSENSEP0 LOAD VOUTP DC/DC VSENSEP3 LOAD VOUTM VSENSEM3 R2_3 DC1978a F06 Figure 6. LTC2974 Configured to Control, Supervise and Monitor Power Supplies Equipped with Tracking Pin dc1978af 9 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS Slave channel n • TON_DELAY = Ton_delay_slave • TON_RISE = Ton_delay_master + Ton_rise_slave • TOFF_DELAY = Toff_delay_master + T_off_delay_slave • Mfr_track_en_chan0 = 1 Where: Ton_delay_master – Ton_delay_slave > RUN to TRACK setup time Toff_delay_slave > time for master supply to fall. PROCEDURE TO DEMONSTRATE TRACKING WITH DC1978A 1. Start with the default LTC2974 EEPROM and jumper settings for DC1978A. Set the jumpers JP1, JP2 and JP3 to TRACK CH0 position. This connects the TRACK pins of the slave supply channels to the output voltage of the master channel through resistive dividers (see Figure 6). 2. Set DC1809A jumper JP4 to SW0 position to propagate the CONTROL0 switch to the CONTROL0 pin of LTC2974. 3. Set the preload (100mA) of CH0 (SW1 to ON) and the preloads of the slave channels CH1 to CH3 to OFF (SW2 to SW4 to OFF). The absence of load for the slave channels makes improper sequencing down behavior more obvious. 4. Configure all power supplies to respond to CONTROL0, by setting the appropriate bit in the paged MFR_CONFIG register. In this case U0:0, U0:1, U0:2 and U0:3 are all controlled by CONTROL0. dc1978af 10 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS 5. Set the TON_DELAY of all slaves (CH1, CH2 and CH3) to 0ms and the TON_DELAY for the master channel to 20ms. 6. Set the TOFF_DELAY of all slaves (CH1, CH2 and CH3) to 20ms and the TOFF_DELAY for the master channel to 0ms. 7. Set the TON_RISE of all slaves (CH1, CH2 and CH3) to 30ms and the TON_RISE for the master channel to 10ms. dc1978af 11 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS 8. Set the track_en_chan1, track_en_chan2 and track_ en_chan3 bits in MFR_CONFIG3 to 1. 9. Toggle the CONTROL0 switch and observe the synchronized tracking behavior of the power supplies. DC1978a F07 Figure 7. Tracking Supplies Up with DC1978A DC1978a F08 Figure 8. Tracking Supplies Down with DC1978A dc1978af 12 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS CASCADE SEQUENCING Cascade sequence ON allows a master power supply to sequence ON a series of slave supplies by connecting each power supply’s power good output to the control pin of the next power supply in the chain. Please note that the power good signal is that of the power supply and not derived from the LTC2974’s internal power good processing. Power good based cascade sequence OFF is not supported, OFF sequencing must be managed using immediate or time based sequence OFF. See also Tracking Based Sequencing. Cascade sequence ON is illustrated in Figure 9. For each slave channel Mfr_config_cascade_on bit is asserted high and the associated control input is connected to the power good output of the previous power supply. In this configuration each slave channel’s startup is delayed until the previous supply has powered up. Cascade sequence OFF is not directly supported. Options for reversing the sequence when turning the supplies off include: • Using the OPERATION command to turn off all the channels with an appropriate off delay. • Using the FAULT pin to bring all the channels down immediately or in sequence with an appropriate off delay. CONTROL0 LTC2974 FAULTB0 FAULTB0 CONTROL0 RECOMMENDED CONNECTION WHEN HARDWARE ON/OFF CONTROL IS REQUIRED VOUT_EN0 RUN VOUTP DC/DC CONTROL1 VOUT_EN1 POWERGOOD0 VOUTM RUN VOUTP DC/DC CONTROL2 VOUT_EN2 VOUT_EN3 POWERGOOD1 VOUTM RUN VOUTP POWERGOOD2 VOUTM RUN VOUTP POWERGOOD3 VSENSEP1 VSENSEM1 VSENSEP2 LOAD DC/DC TO NEXT CONTROL PIN MASTER VSENSEM0 LOAD DC/DC CONTROL3 VSENSEP0 LOAD SLAVES VSENSEM2 VSENSEP3 LOAD VOUTM VSENSEM3 DC1978a F09 Figure 9. LTC2974 Configured to Cascade Sequence ON and Time Base Sequence OFF dc1978af 13 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS PROCEDURE TO DEMONSTRATE CASCADE SEQUENCING WITH DC1978A 1. Start with the default LTC2974 EEPROM and jumper settings for DC1978A. Set the DC1809A power good cascading jumpers JP4, JP5, JP6 and JP7 to SW0, PG_0, PG_1, PG_2 positions. This connects the power good and control pins as shown in Figure 9. 2. Enable all output supply preloads on DC1810A by sliding the DC1810A switches SW1, SW2, SW3 and SW4 to ON position. 3. Set the TON_DELAY of all channels to 0ms 4. Set the TOFF_DELAY for the inverse shutdown sequence. dc1978af 14 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS 5. Set the cascade_on bit in MFR_CONFIG register for CH1, CH2 and CH3. The master channel has this bit cleared. 6. Use Group Operation On to power up all supplies dc1978af 15 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS 7. Use Group Operation “Sequence Off” to power down all supplies 8. The power supplies cascade ON/OFF as shown in Figures 10 and 11 below. DC1978a F10 Figure 10. Cascade Sequencing Up with DC1978A DC1978a F11 Figure 11. Time Based Sequencing Down with DC1978A dc1978af 16 DEMO MANUAL DC1978A SETUP PROCEDURE FOR MULTIBOARD ARRAYS Multiple DC1978As can be combined to control up to 36 independent power supplies. This demonstrates the coordinated fault responses and accurate time base shared across multiple LTC2974 chips. Procedure: 1. Stack the boards together by plugging J1 of the second DC1809A board into J3 of the first DC1809A board. 2. Connect the 12V VIN across the boards using the banana cables as shown in Figure 12 below. Preserve the correct polarity (connect VIN to VIN and GND to GND). 3. The USB to I2C/SMBus/PMBus controller may be plugged into either board. If both LTC2974s do not show up in the GUI, click the hourglass icon to enumerate the I2C bus and find the addresses of the parts. Make sure to set different addresses for each LTC2974. 4. The addresses of the LTC2974 are set by the jumpers JP1 and JP2 on DC1809A and the settings have to be unique for each board in the array. 5. Since the individual control lines are connected across the boards (CONTRL0 is a common bus across all boards in the array, as are CONTROL1 CONTROL2 and CONTROL3), make sure that all control pins on all DC1809A boards are set to the selected active state. 6. Relaunch LTpowerPlay. After launching, LTpowerPay will enumerate the entire board array and build a representative system tree and read all hardware settings into the GUI. Figure 12. Array of Multiple DC1978A Demo Boards dc1978af 17 DEMO MANUAL DC1978A DC1809A DETAILS TOP Table 4. DC1809A Default Jumper and Switch Configuration (Default Position Shown in Grey in the Figure Above) REFERENCE DESIGNATOR SIGNAL NAME USAGE DEFAULT JP1, JP2 ASEL0, ASEL1 Set the address offset of LTC2974 LOW, LOW JP3 WRITE PROTECT Write protect the LTC2974 EEPROM memory OFF JP4, JP5, JP6, JP7 CONTROL0, CONTROL1, CONTROL2, CONTROL3 Implement cascade sequencing by SW0, SW1, SW2, connecting power good signals to the SW3 control pins, or connect the control pins directly to the SW0 to SW3 switches SW0, SW1, SW2, SW3 CONTROL0, CONTROL1 CONTROL2, CONTROL3 Switches that can be routed to the individual CONTROL input pins of LTC2974 HI, HI, HI, HI dc1978af 18 DEMO MANUAL DC1978A DC1809A DETAILS BOTTOM dc1978af 19 DEMO MANUAL DC1978A DC1809A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 U1 LTC2974 LINEAR TECHNOLOGY LTC2974CUP 2 7 C1, C2, C3, C4, C6, C8, C9 CAP CERAMIC 0.10μF 16V X7R 0402 TDK C1005X7R1C104K 3 1 C7 CAP CER 0.10μF 25V X5R 0402 TAIYO YUDEN TMK105BJ104KV-F 4 13 R1, R3, R4, R6, R7, R8, R9, R10, R11, R12, R13, R14, R15 RES 10k 1/10W 1% 0402 SMD PANASONIC - ECG ERJ-2RKF1002X Additional Demo Board Circuit Components 5 3 C12, C15, C33 CAP CERAMIC 0.10μF 16V X7R 0402 TDK C1005X7R1C104K 6 14 C5, C10, C11, C13, C14, C16, C23, C24, C25, C26, C28, C29, C30, C31 CAP 0.01μF 25V CERAMIC X7R 0402 TDK C1005X7R1E103K 7 4 C17, C20, C21, C22 CAP CER 0.10μF 25V X5R 0402 TAIYO YUDEN TMK105BJ104KV-F 8 1 C18 CAP CER 10μF 16V X5R 0805 MURATA ELECTRONICS GRM21BR61C106KE15L 9 3 C19, C27, C32 CAP CERAMIC 1μF 25V X5R 0603 AVX 06033D105KAT2A 10 2 D1, D6 LED GREEN S-GW TYPE SMD PANASONIC - SSG LN1371SGTRP 11 4 D2, D3, D4, D5 LED RED S-TYPE GULL WING SMD PANASONIC - SSG LN1271RTR 12 1 D7 DIODE SCHOTTKY 20V 1A SOD323 NXP SEMICONDUCTOR BAT760,115 13 1 J1 CONN SOCKET 20 DUAL ROW MILL MAX 803-93-020-20-001 14 1 J2 CONN HEADER 12POS 2mm STR DL PCB FCI 98414-G06-12ULF 15 1 J3 CONN PIN HEADER 20 DUAL ROW MILL MAX 802-40-020-20-001 16 1 J4 CONN FMALE 50POS DL 0.1" R/A GOLD SULLINS CONNECTOR SOLUTIONS PPPC252LJBN-RC 17 1 J5 CONN HEADER VERT 0.050 4POS TYCO ELECTRONICS 5-104071-7 18 1 Q1 MOSFET P-CH 20V 670MA SOT323-3 VISHAY/SILICONIX SI1303DL-T1-E3 19 1 Q2 MOSFET N-CH 60V 115MA SOT-23 FAIRCHILD SEMICONDUCTOR 2N7002 20 1 Q3 MOSFET N-CH DUAL 20V 1.3A SC70-6 VISHAY/SILICONIX SI1922EDH-T1-E3 21 5 R2, R18, R23, R31, R36 RES 100Ω 1/10W 1% 0402 SMD PANASONIC - ECG ERJ-2RKF1000X 22 1 R5 RES 5.49k 1/10W 1% 0402 SMD PANASONIC - ECG ERJ-2RKF5491X 23 1 R16 RES 150k 1/10W 1% 0402 SMD PANASONIC - ECG ERJ-2RKF1503X 24 1 R17 RES 49.9k 1/10W 1% 0402 SMD VISHAY, CRCW040249K9FKED 25 6 R19, R20, R27, R35, R44, R47 RES 100k 1/10W 1% 0402 SMD PANASONIC - ECG ERJ-2RKF1003X 26 2 R21, R43 DO NOT INSTALL DO NOT INSTALL 27 2 R22, R29 RES 0Ω 1/10W 0402 SMD PANASONIC - ECG ERJ-2GE0R00X 28 6 R24, R25, R26, R28, R30, R33 DO NOT INSTALL DO NOT INSTALL 29 2 R32, R34 RES 4.99k 1/10W 1% 0402 SMD PANASONIC - ECG ERJ-2RKF4991X 30 1 R37 RES 1k 1/16W 1% 0402 SMD PANASONIC - ECG ERJ-2RKF1001X 31 5 R38, R39, R40, R41, R42 RES 300Ω 1/10W 1% 0402 SMD PANASONIC - ECG ERJ-2RKF3000X 32 1 R45 RES 4.87k 1/10W 1% 0402 SMD PANASONIC - ECG ERJ-2RKF4871X 33 1 R46 RES 16.9k 1/10W 1% 0402 SMD PANASONIC - ECG ERJ-2RKF1692X 34 1 SW4 SWITCH LT TOUCH 6mm x 3.5mm 100GF SMD PANASONIC - EVQ-PES04K 35 1 U2 IC EEPROM 2k BIT 400kHz 8TSSOP MICROCHIP TECH 24LC025-I/ST dc1978af 20 DEMO MANUAL DC1978A DC1809A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 36 1 U3 LT1763 - 500mA, LOW NOISE, LDO MICROPOWER REGULATORS LINEAR TECHNOLOGY LT1763CS8-3.3 37 2 U4, U5 IC BUFF/DVR DL NON-INV SC706 TEXAS INST SN74LVC2G07DCKR 38 1 U6 LTC4365 - UV, OV AND REVERSE SUPPLY PROTECTION CONTROLLER LINEAR TECHNOLOGY LTC4365CTS8 Hardware/Components (For Demo Board Only) 39 2 JP1, JP2 CONN HEADER 4POS 2mm VERT T/H 3M 951104-8622-AR 40 5 JP3, JP4, JP5, JP6, JP7 CONN HEADER 3POS 2mm VERT T/H SULLIN, NRPN031PAEN-RC 41 4 SW1, SW2, SW3, SW0 SW SLIDE DPDT 6VDC 0.3A PCMNT C & K COMPONENTS JS202011CQN 42 15 TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11, TP12, TP13, TP14, TP15 TERMINAL TURRET DBL 0.084"L MILL-MAX, 2308-2-00-80-00-00-07-0 43 7 SHUNT1, SHUNT2, SHUNT3, SHUNT4, SHUNT5, SHUNT6, SHUNT7 CONN SHUNT 2mm 2POS SAMTEC 2SN-BK-G 44 4 MH1, MH2, MH3, MH4 STAND-OFF NYLON 1/2" SNAP IN KEYSTONE 8833 dc1978af 21 DEMO MANUAL DC1978A DC1809A SCHEMATIC DIAGRAM dc1978af 22 DEMO MANUAL DC1978A DC1809A SCHEMATIC DIAGRAM dc1978af 23 DEMO MANUAL DC1978A DC1809A SCHEMATIC DIAGRAM dc1978af 24 DEMO MANUAL DC1978A DC1810A DETAILS TOP Table 5. DC1810A Default Jumper and Switch Configuration (Default Position Shown in Grey in the Figure Above) REFERENCE DESIGNATOR SIGNAL NAME USAGE DEFAULT JP1, JP2 Track/Soft-Start Set CH0 tracking or soft-start for CH1, CH2 and CH3 SOFT-START Enable/Disable 100mA load on CH0, CH1, CH2, CH3 outputs ON SW1, SW2, SW3, SW4 dc1978af 25 DEMO MANUAL DC1978A DC1810A DETAILS BOTTOM dc1978af 26 DEMO MANUAL DC1978A DC1810A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 16 R3, R4, R7, R8, R34, R35, R38, RES 1k 1/10W 1% 0603 SMD R39, R40, R41, R43, R44, R53, R54, R58, R59 PANASONIC ERJ-3EKF1001V 2 8 R10, R16, R29, R33, R47, R49, R62, RES 100Ω 1/10W 1% 0603 SMD R63 PANASONIC - ECG ERJ-3EKF1000V 3 16 C2, C8, C13, C18, C32, C36, C38, C40, C43, C49, C51, C55, C56, C58, C64, C66 CAP CER 0.10μF 25V X7R 10% 0603 TDK CORPORATION C1608X7R1E104K 4 8 C3, C9, C39, C41, C44, C50, C57, C59 CAP 3300pF 50V CERAMIC X7R 0603 MURATA GRM188R71H332KA01D MURATA GRM188R71H332KA01D Additional Demo Board Circuit Components 5 8 C3, C9, C39, C41, C44, C50, C57, C59 CAP 3300pF 50V CERAMIC X7R 0603 6 4 C21, C22, C71, C74 CAP CERM 0.22μF 10% 16V X5R 0603 AVX CORP - 0603YD224KAT2A 7 4 Q2, Q3, Q6, Q7 TRANS GP SS PNP 40V SOT323 ON SEMI - MMBT3906WT1G 8 1 R15 RES 47k 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF4702V 9 1 R26 RES 68k 1/10W 1% 0603 SMD VISHAY CRCW060368K0FKEA 10 1 R50 RES 180k 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF1803V 11 1 R51 RES 220k 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF2203V 12 7 C1, C5, C24, C29, C72, C73, C76 CAP CERAMIC 1μF 25V X5R 0603 AVX 06033D105KAT2A 13 7 C4, C6, C7, C26, C27, C28, C77 CAP CER 10μF 16V X5R 0805 MURATA - GRM21BR61C106KE15L 14 5 C10, C17, C23, C31, C78 CAP 1000pF 50V CERAMIC X7R 0603 NIC NMC0603X7R102K50TRPF 15 2 C11, C33 CAP 22000pF 16V CERM X7R 0603 MURATA GRM188R71C223KA01D 16 4 C12, C19, C37, C42 CAP CER 4.7μF 10V X5R 0603 TAIYO YUDEN LMK107BJ475KA-T 17 2 C14, C25 CAP CER 0.47μF 10V 20% X5R 0603 AVX 0603ZD474MAT2A 18 4 C15, C16, C34, C35 CAP CER 47μF 6.3V X5R 20% 1210 TDK CORPORATION C3225X5R0J476M 19 2 C20, C30 CAP CERAMIC 33pF 100V NP0 0603 MURATA GRM188C2A330JA01D 20 7 C45, C46, C47, C48, C68, C69, C70 CAP CER 10μF 25V X5R 1206 MURATA ELECTRONICS GRM31CR61E106KA12L 21 2 C52, C62 CAP CER 100μF 6.3V X5R 20% 1210 TDK CORPORATION C3225X5R0J107M 22 2 C53, C63 CAP TANT 330μF 6.3V 10% SMD SANYO 6TPF330M9L 23 2 C54, C65 CAP CER 22μF 16V X5R 10% 1206 AVX CORPORATION 1206YD226KAT2A 24 3 C60, C61, C75 CAP 10000pF 16V CERM X7R 0603 MURATA GRM188R71C103KA01D 25 1 C67 CAP POLY ALUM 220μF 20V RAD NICHICON PLV1D221MDL1TD 26 2 VIN1, GND1 TERMINAL TURRET DBL 0.084"L MILL MAX 2308-2-00-80-00-00-07-0 27 3 JP1, JP2, JP3 CONN HEADER 3POS 2MM VERT T/H 3M 951103-8622-AR 28 1 J1 BERGSTIK MOLEX 90122-0785 29 2 J2, J3 JACK NON-INSULATED 0.218 KEYSTONE ELECTRONICS 575-4 30 2 L1, L2 INDUCTOR POWER 4.7μH 4.5A SMD VISHAY/DALE IHLP2020CZER4R7M11 31 4 PG1, PG2, PG3, PG0 LED GREEN S-GW TYPE SMD PANASONIC - SSG LN1371SGTRP 32 1 PWR1 CONN POWER JACK 2.1mm CUI INC PJ-002A 33 2 Q1, Q4 MOSFET N-CH DUAL 20V 1.3A SC70-6 VISHAY/SILICONIX SI1988DH-T1-E3 34 1 Q5 MOSFET N-CH DUAL 60V 6.5A 8-SOIC VISHAY/SILICONIX SI4946BEY-T1-E3 35 1 R42 DO NOT INSTALL DO NOT INSTALL 36 4 R1, R36, R66, R67 RES 10MΩ 5% 1/10W 0603 SMD PANASONIC - ECG ERJ-3GEYJ106V 37 4 R2, R37, R64, R65 RES 330Ω 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF3300V dc1978af 27 DEMO MANUAL DC1978A DC1810A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 38 2 R9, R28 RES 1k 1/10W 1% 0603 SMD PANASONIC ERJ-3EKF1001V 39 2 R5, R21 RESISTOR 2.2Ω 1/10W 5% 0603 PANASONIC - ECG ERJ-3GEYJ2R2V 40 2 R6, R23 RES 10Ω 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF10R0V 41 8 R11, R14, R22, R25, R30, R55, R57, RES 20k 1/10W 1% 0603 SMD R60 NIC NRC06F2002TRF 42 2 R12, R24 PANASONIC - ECG ERJ-3EKF6200V 43 2 R13, R19 RES 75k 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF7502V 44 1 R17 RES 10k 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF1002V 45 2 R18, R20 RES 226Ω 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF2260V 46 2 R27, R31 RES 13.3k 1/10W 1% 0603 SMD YAGEO RC0603FR-0713K3L 47 1 R32 RES 40.2k 1/10W 1% 0603 SMD VISHAY CRCW060340K2FKEA 48 1 R45 RES 0Ω 1/10W 0603 SMD PANASONIC - ECG ERJ-3GEY0R00V 49 1 R46 RES 120k 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF1203V 50 1 R48 RES 60.4k 1/10W .5% 0603 SMD YAGEO RT0603DRD0760K4L 51 1 R52 RES 91k 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF9102V 52 1 R56 RES 1MΩ 1/10W 1% 0603 SMD NIC NRC06F1004TRF 53 1 R61 RES 30k 1/10W 1% 0603 SMD NIC NRC06F3002TRF 54 1 R68 RESISTOR 0.020Ω 1W 1% 2512 PANASONIC - ECG ERJ-M1WSF20MU 55 2 R69, R72 RES 150k 1/10W 1% 0603 SMD VISHAY CRCW0603150FKFEA 56 1 R70 RES 13.3k 1/10W 1% 0603 SMD NIC NRC06F1332TRF 57 3 R71, R75, R76 RES 5.49k 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF5491V 58 1 R73 RES 10k 1/10W 1% 0603 SMD PANASONIC - ECG ERJ-3EKF1002V 59 1 R77 RES 18Ω 1/2W 5% 1210 SMD VISHAY/DALE CRCW121018R0JNEA 60 1 R78 RES 15Ω 1/2W 5% 1210 SMD VISHAY/DALE CRCW121015R0JNEA 61 1 R79 RES 12Ω 1/2W 5% 1210 SMD VISHAY/DALE CRCW121012R0JNEA 62 1 R80 RES 10Ω 1/2W 5% 1210 SMD VISHAY/DALE CRCW121010R0JNEA 63 4 SW1, SW2, SW3, SW4 SW SLIDE DPDT 6VDC 0.3A PCMNT C & K COMPONENTS JS202011CQN 64 8 TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8 TERM SOLDER TURRET 0.094" HOLE MILL MAX 2501-2-00-80-00-00-07-0 65 2 U1, U3 IC MOSFET DRVR 12V 40A 56-QFN RENESAS - R2J20602NP#G3 66 1 U2 LTC3860 - DUAL, MULTIPHASE STEP-DOWN VOLTAGE MODE DC/DC CONTROLLER WITH CURRENT SHARING LINEAR TECHNOLOGY LTC3860EUH#PBF 67 1 U4 LTM4620 - DUAL 13A OR SINGLE 26A DC/DC μModule® REGULATOR LINEAR TECHNOLOGY LTM4620 68 1 U5 LTC4365 - UV, OV AND REVERSE SUPPLY PROTECTION CONTROLLER LINEAR TECHNOLOGY LTC4365CTS8 69 1 U6 LTC6902 - MULTIPHASE OSCILLATOR WITH SPREAD SPECTRUM FREQUENCY MODULATION LINEAR TECHNOLOGY LTC6902CMS 70 1 U7 IC EEPROM 2k BIT 400kHz 8TSSOP MICROCHIP TECHNOLOGY 24LC025-I/ST 71 1 U8 LT1763 - 500mA, LOW NOISE, LDO MICROPOWER REGULATORS LINEAR TECHNOLOGY LT1763CS8-5 RES 620Ω 1/10W 1% 0603 SMD Hardware/Components (For Demo Board Only) 72 3 SHUNT1, SHUNT2, SHUNT3 CONN SHUNT 2mm 2POS SAMTEC 2SN-BK-G 73 4 MH1, MH2, MH3, MH4 STAND-OFF NYLON 1/2" SNAP IN KEYSTONE 8833 dc1978af 28 DEMO MANUAL DC1978A DC1810A SCHEMATIC DIAGRAM dc1978af 29 DEMO MANUAL DC1978A DC1810A SCHEMATIC DIAGRAM dc1978af 30 DEMO MANUAL DC1978A DC1810A SCHEMATIC DIAGRAM dc1978af 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. 31 DEMO MANUAL DC1978A 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 dc1978af 32 Linear Technology Corporation LT 0512 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2012