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
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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
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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
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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
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DEMO MANUAL DC1978A
DC1978A DETAILS TOP SIDE
DC1978a F03
Figure 3. DC1978A Top Details
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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)
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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
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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
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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
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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
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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
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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
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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.
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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
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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
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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
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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
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