DC2428A - Demo Manual

DEMO MANUAL DC2428A
LTC2975
4-Channel PMBus Power System Manager
with LTM4644 Quad 4A Power Supply
DESCRIPTION
The DC2428A is a two-board demonstration system for
the LTC®2975 Power System Manager and LTM4644 quad
4A µModule regulator. The DC2382A contains all the circuitry needed to use the LTC2975 in a power system and
control four power supplies. The DC2363A contains four
power supplies (LTM4644) that the LTC2975 configures
and controls. The DC2363A and DC2382A demo boards
together provide a sophisticated 4-channel digitally programmable power supply system.
The LTC2975 is a 4-channel I2C/SMBus/PMBus power
system manager that features accurate input current and
energy measurement. The device monitors input current
and input voltage, and calculates input power and energy.
The DC2382A demonstrates the ability of the LTC2975
to sequence, trim, margin, supervise, monitor, and log
faults for four power supplies. Each power supply channel’s output voltage and output current is monitored and
the LTC2975 monitors its own internal die temperature.
The DC2363A is a single circuit board that contains four
independent power supply rails. The board employs a single
LTM4644 4-channel 4A DC/DC regulator. The board comes
pre-configured with 1V, 1.5V, 2.5V, and 3.3V supply rails
and may be reconfigured with feedback resistors.
The LTpowerPlay™ graphical user interface (GUI) supports
this demonstration system and enables complete control of
all the features of the LTC2975. Together, the LTpowerPlay
software and DC2428A hardware system create a powerful
development environment for designing and testing configuration settings of the LTC2975. LTpowerPlay stores
these settings in the LTC2975’s internal EEPROM or in a
project file. The software displays all of the configuration
settings and real time measurements from the Power
System Management IC. Telemetry allows easy access
and decoding of the fault log created by the LTC2975.
The board comes pre-programmed with the EEPROM
values appropriate for the four power supply rails on the
DC2428A. Just plug and play!
The following items are required:
•+12VDC Power Supply
• USB-to-I2C/SMBus/PMBus Controller (DC1613)
• LTpowerPlay Software
DC2428A Features
• Sequence, Trim, Margin, and Supervise Four Power
Supplies
• Manage Faults, Monitor Telemetry, and Create Fault Logs
• PMBus Compliant Command Set
• Supported by LTpowerPlay GUI
• Margin or Trim Supplies to 0.25% Accuracy
• Four IOUT and One IIN Monitor
• Input Power Measurement and Energy Accumulation
• Fast OV/UV Supervisors Per Channel
• Multi-Channel Fault Management
• Automatic Fault Logging to Internal EEPROM
• Operates Autonomously without Additional Software
• Monitors: Voltage, Current, Power, Temperature
•4-Channel Time-Based Output Sequencer
• I2C/SMBus Serial Interface
• Powered from 4.5V to 14V
Design files for this circuit board are available at
http://www.linear.com/demo/DC2428A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
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DEMO MANUAL DC2428A
PERFORMANCE SUMMARY
PARAMETER
Specifications are at TA = 25°C
CONDITIONS
MIN
VPWR Supply Input Operating Range
4.5
VDD33 Supply Input Operating Range
MAX
UNITS
15
3.13
VIN ≥ 1V
ADC Total Unadjusted Error
TYP
V
3.47
V
±0.25
ADC Voltage Sensing Input Range
–0.1
ADC Current Sensing Input Range
Differential Current Sense Voltage
ADC Voltage Sensing Resolution
0V ≤ VIN_ADC ≤ 6V
ADC Current Sense Resolution
0mV < |VIN_ADC| < 16mV
16mV < |VIN_ADC| < 32mV
32mV < |VIN_ADC| < 63.9mV
63.9mV < |VIN_ADC| < 127.9mV
127.9mV < |VIN_ADC|
6
–170
DAC Resolution
%
V
170
mV
122
µV/LSB
15.6
31.25
62.5
125
250
µV/LSB
µV/LSB
µV/LSB
µV/LSB
µV/LSB
10
DAC Full-Scale Output Voltage
Buffer gain setting 0
Buffer gain setting 1
Temperature Sensor TUE
Voltage Supervisor Input Voltage Range
(Programmable)
VSENSEP[n](Low Resolution)
(High Resolution)
Voltage Supervisor Sensing Resolution
0V to 3.8V range: 4.096/1024
0V to 6V range: 8.192/1024
Voltage Supervisor Total Unadjusted Error (TUE)
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
bits
1.38
2.65
V
V
±1
°C
0
0
6
3.8
4
8
I2C Serial Clock Frequency
V
V
mV/LSB
mV/LSB
±1.25
±1.0
±1.5
10
%
%
%
400
kHz
Table 1. Demo Board System Specifications
NOMINAL UNTRIMMED
VOUT
TOP EXT. FEEDBACK
RESISTOR (k)
BOTTOM FEEDBACK
RESISTOR (k)
RDAC (k)
MARGIN RANGE (%)
CH0
1.0V ±1.5%
6.04
8.25
20.5
±15
CH1
1.5V ±1.5%
6.04
3.65
14.3
±15
CH2
2.5V ±1.5%
6.04
1.74
8.25
±15
CH3
3.3V ±1.5%
6.04
1.21
6.81
±15
Notes:
• Load current <4A is recommended.
• Output voltages can be margined by ±15% from nominal with the default resistor values on the DC2363A. These values can be easily changed. See
section Changing Nominal Output Voltages. Use the LTC2975 Resistor Selection Tool which is accessed from LTpowerPlay.
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DEMO MANUAL DC2428A
GLOSSARY OF TERMS
The following list contain terms used throughout the
document.
Trim: The act of adjusting the final output voltage. A servo
loop is typically used to trim the voltage.
Channel: The collection of functions that monitor, supervise, and trim a given power supply rail.
UV: Undervoltage, the result of a voltage comparison that
a pin voltage is below a programmable threshold voltage.
EEPROM: Non-volatile memory (NVM) storage used to
retain data after power is removed.
What this Demo System Can Do
Margin: Term used typically in board level testing that
increases/decreases the output voltage to look for sensitivity/marginality problems.
Monitor: The act of measuring voltage, current, and temperature readings.
• Prototype your system. You can change the nominal
output voltages to match your system. You can also
change the range and resolution of margining. Set
sequencing. Set OV/UV limits. Set OC limits.
NVM: Non-volatile memory, see EEPROM.
• Create your own configuration that you can store in the
EEPROM of the LTC2975 or save to a file. This file can
be used to order pre-programmed parts.
OV: Overvoltage, the result of a voltage comparison that
a pin voltage is above a programmable threshold voltage.
• Test most conceivable fault scenarios. All outputs can
be shorted.
PMBus: An industry standard power-management protocol
with a fully defined command language that facilitates
communication with power converters and other devices
in a power system.
Demo System Hardware
Hardware required:
1. PC + USB cable
Rail: The final output voltage that the LTC2975 supervises.
2.12V, >1A power supply
Supervise: The act of quickly responding (compared to
a fault setting) to a voltage and current condition that is
compared to pre-programmed values.
3. USB to I2C/SMBus/PMBus Controller
4. DC2428A = DC2363A + DC2382A
Figure 1. Single LTC2975 Demo Setup Using DC2428A
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DEMO MANUAL DC2428A
LTpowerPlay GUI SOFTWARE
LTpowerPlay is a powerful Windows-based development
environment that supports Linear Technology Power System Management ICs with EEPROM, including the LTC2975
4-Channel Power System Manager. 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 features an offline mode to
build a multi-chip configuration file for later use with
hardware. LTpowerPlay provides unprecedented system
level 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 DC1613 I2C/SMBus/PMBus Controller to communicate with one of many potential targets, including the
DC2428A 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. Download the software from:
http://www.linear.com/ltpowerplay
Select Help, View Online Help from the LTpowerPlay menu
to access technical documents.
Figure 2. Screenshot of the LTpowerPlay GUI
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DEMO MANUAL DC2428A
QUICK START PROCEDURE
The following procedure describes how to set up a DC2428A
demo system.
1. Download and install the LTpowerPlay GUI:
www.linear.com/ltpowerplay
2. Remove the board from the ESD protective bag and
place it on a level surface. Connect the DC1613 I2C/
SMBus/PMBus Controller to the DC2382A board using
the 12-pin ribbon cable.
3. Confirm that all jumpers and switches are set as follows:
b. On the DC2382A board, set ASEL jumpers to LOW,
CONTROL jumpers to SW0-SW3, and WRITE-PROTECT
jumper to OFF.
c. On DC2363A board, set PRE-LOAD jumpers to ON,
and TRACK jumpers to SS.
4. Plug the USB-to-I2C/SMBus/PMBus Controller into a
USB port on your PC. The board should power up with
the LED labeled LTC2975 ON illuminated green.
5. Connect a +12VDC power supply with > 1A capacity
a. The CONTROL switches are set to the HI position.
Figure 3. Connecting DC2363A/DC2382A Boards and the DC1613 USB to I2C/SMBus/PMBus Controller
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DEMO MANUAL DC2428A
QUICK START PROCEDURE
to the VIN input jack of the DC2363A board. The four
outputs will power up and the green LEDs will illuminate.
The PWR GOOD LED (D6) on the DC2382A board will
illuminate.
6. Launch the LTpowerPlay GUI.
a. The GUI automatically identifies the DC2382A and
builds a system tree for each I2C device. The system
tree on the left hand side will look like this:
If you need to load the original board default
configuration, select the GUI menu pulldown item DEMO
> DC2382A_Defaults. This writes the board defaults
into the LTC2975’s RAM and automatically to NVM as
well.
7. The CONTROL switches are configured to control the
channels individually. Slide the switch to HI to enable,
GND to disable each channel. To demonstrate channel sequencing, one CONTROL switch may be used
to turn all channels on/off. Configuration changes to
the LTC2975 are needed. This is covered later in the
document.
Loading a Configuration (*.proj) File with the GUI
To load a previously saved proj file:
b. A green message box will be displayed momentarily in
the lower left hand corner confirming that the DC2382A
is communicating.
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 GO ONLINE icon, then click on the PC RAM icon to write all registers.
c. You may make configuration changes. When you
update registers in the GUI by using either function key
F12 to write an individual register or use the Write All
icon to write all registers, you may need these settings
for future use. Save the demo board configuration to
a (*.proj) file by clicking the Save icon. This creates a
backup file on your C: drive. Name it whatever you like.
This loads the configuration into the working RAM of
the LTC2975.
3. To store the configuration to NVM (EEPROM), click on
the RAM NVM icon.
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DEMO MANUAL DC2428A
DC2428A - DETAILS (DC2363A + DC2382A)
Figure 4. DC2428A Details
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DEMO MANUAL DC2428A
COMMON BOARD OPERATIONS
Overview
DC2382A LEDs
The two boards are represented below in a simplified block
diagram. The LTC2975 measures input current with a 10
milliohm sense resistor. It also controls, monitors, and
supervises all four LTM4644 outputs through the 50-pin
connector.
The LTC2975 ON LED (D1) illuminates when the LTC2975
is powered from the USB controller or the DC2363A external power. The green LED (D6) is the LTC2975 PWRGD
signal. The red LEDs on ALERTB, FAULTB0, FAULTB1 and
AUXFAULTB (D3 ,D4, D5, D2) indicate a fault or warning
has occurred.
Powering the Boards
The DC2363A board is powered from a wall-powered 12V
supply. The supply must be capable of delivering > 1A.
If the four channels are loaded with 1A each, the input
current will be nearly 1A. The DC2382A board is powered
either from the DC1613’s 3.3V power or the DC2363A if
VIN is applied.
DC2363A LEDs
Each individual channel on DC2363A has its own green
LED which indicates that the channel is enabled.
Figure 5. Simplified Block Diagram of the DC2428A
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DEMO MANUAL DC2428A
COMMON BOARD OPERATIONS
Reset the LTC2975
To reset the LTC2975 and reload the EEPROM contents into
operating memory (RAM), press SW4 on the DC2382A.
Pre-Load the Outputs
Each of the outputs on the DC2363A board has a jumper
to pre-load the output. When enabled, the load current
is pre-defined to be 100mA. This ensures an unloaded
output voltage decays to GND quickly when the channel
is disabled. This is useful when sequencing off then on
quickly.
applied to each of the channels relative to the CONTROL0
pin. The same applies to TOFF_DELAY values. When the
CONTROL switch is set to the OFF position, all rails will
power down sequentially based device’s TOFF_DELAY
values. Figure 6 shows an oscilloscope screen capture of
three output rails sequencing up and down in response
to the CONTROL pin.
Controlling/Sequencing Channels
By default the DC2382A board comes with each of the four
CTRL switches configured to enable its respective channel.
Figure 6. Sequencing Output Channels On/Off
Each channel has an LED which visually indicates if the
channel has power. When the CONTROL pin is switched
on and off, you will observe the relative on/off timing of
the four channels.
To demonstrate time-based sequencing, let’s use the
CTRL0 switch as the master enable. Select CONTROL0
for each channel as shown. Click the All Paged button and
expand the MFR_CONFIG register. Change the controln_sel
bit for each channel using in the GUI’s system tree.
Figure 7. TON_DELAY and TOFF_DELAY Settings
The LTC2975 are pre-configured with different TON_DELAY
values for each channel. The TON_DELAY parameter is
For the LTC2975, the TON_DELAY and TOFF_DELAY values extend to 655ms, providing a reasonable range for
sequencing on and off of power supply rails.
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DEMO MANUAL DC2428A
COMMON BOARD OPERATIONS
Margin All Rails
The LTC2975 power system manager on the DC2382A not
only monitors each of the four outputs but can margin the
outputs either high or low. Margining is the operation that
moves a rail up or down for testing purposes. It allows a
system to be fully characterized over supply limits without the use of external hardware or resources. The GUI
provides an easy way to margin all rails high or all low
by clicking one of four buttons. To invoke the margining
dialog, click the GroupOp icon in the toolbar.
The buttons labeled ignore faults will margin without creating a fault even if the fault limits are exceeded.
A look at the telemetry window shows the effect of the
margin high or margin low operation. The following screen
shot shows all rails going from nominal setpoints to margin
high, margin low, and back to nominal voltages.
The LTC2975 has a multiplexed ADC that is used to provide voltage, current, and temperature readback values.
The telemetry plot in the GUI is similar to a multi-channel
oscilloscope which is capable of displaying any parameter
that is displayed in the telemetry window. Due to the nature
of a multiplexed ADC converter, it has an associated ADC
loop time of approximately 150ms.
Creating a Fault
Any one of the channels on the DC2363A board may be
faulted to demonstrate the demo board’s ability to detect
it and respond according to the configuration. An output
may be shorted to ground with a jumper wire or coin
applied to the output and GND turrets. When faulted, all
channels power down immediately and the GUI’s system
tree indicates the color red for the Status portion of that
channel. In this example, GUI channel U0:1, the 1.5V
output. You should see all outputs power off, the fault LED
momentarily illuminate, the alert LED illuminate continuously, and all rails sequence back on after a retry period.
You may also short any power supply output indefinitely.
This is a good way to induce UV faults and shows that a
shorted channel will not be damaged.
Clearing a Fault
To clear a fault, you can click the CF icon in the GUI or
simply push the RESET pushbutton (SW4) on the DC2382A
demo board. In both cases, the red (+) on the CF icon and
alert LED on the board are both cleared. Notice that all
rails are automatically re-enabled after a programmable
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DEMO MANUAL DC2428A
COMMON BOARD OPERATIONS
retry period. A dialog box may pop up after clicking the
Clear Faults (CF) icon.
If a fault log is present, a dialog will ask if you would like
to clear the fault log as well as clear system faults. After
clearing faults, the system tree will return to green and fault
logs re-armed. For further information, see the Working
with the Fault Log section.
Why am I Off? Tool
Use the Why am I Off tool in the LTpowerPlay GUI to
diagnose the cause for a power supply channel being in
an off state. The tool is located in the top right corner of
the GUI, above the Register Information tab. Hover your
cursor over the tab to show the tool.
First select an output channel in the system tree. The
tool collects various status information and provides a
diagnosis.
Figure 8. Why am I Off Tool in the LTpowerPlay GUI
ADVANCED DEMO BOARD OPERATIONS
What Is a Fault Log?
Create a Fault Log
A fault log is a non-volatile record of the power system
leading up to the time of fault. Telemetry data is continuously updated in a circular RAM buffer in the LTC2975.
When a fault occurs, the contents of the RAM buffer are
automatically written to NVM. The most recent monitored
values (uptime, voltage, current, temperature) provide
additional context preceding the fault. It is a powerful
diagnostic feature of the LTC2975 on the DC2382A demo
board.
To create a fault log, check that the fault_log_enable bit is
set in the MFR_CONFIG_ALL register. Then, create a fault,
as described in the section Creating A Fault. If multiple
boards are configured, select the appropriate device in the
system tree by clicking on the appropriate LTC2975 chip.
We are ready to work with the fault log.
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DEMO MANUAL DC2428A
ADVANCED DEMO BOARD OPERATIONS
Working with the Fault Log
Once a fault has occurred, the Fault Log (FL) icon will show
a red (+) sign on it, indicating that the GUI has detected
a fault log in the device. Clicking the icon will bring up a
dialog box.
contains data obtained in one ADC loop time with the
most recent ADC loop data on top and the oldest data at
the bottom of the log. The up-time indicates, at the time
of fault, the amount of time the device had been powered
up or time since the previous reset.
Note that it is a context sensitive icon. If multiple DC2382A
boards are connected, be sure that the desired device is
selected in the system tree.
Once a fault occurs, the device will automatically write the
fault log data to EEPROM (NVM). At this point, the log is
locked and will not change until it is cleared by the user.
It is a 2-step process to read the fault log. First click the
NVM to RAM button. At this point the RAM Log is locked.
Click the Read NVM Log button. The log data will appear
in the text box below.
In this case, the fault log will show that channel U0:1
faulted due to a VOUT_UV_FAULT condition. On the previous telemetry loop, the channel voltage reading was a
nominal value (3.3V). You can save the fault log to a file
(.rtf) by clicking the Export button.
To clear the fault log, click the Clear/Rearm EEPROM Log
button. This allows the selected device to be ready for a
new fault event. To clear all faults, click the Clear Faults
(CF) icon.
Fault Sharing Setup in the GUI
Fault sharing provides a means of propagating a fault
detected by a power manager to other power managers
via FAULT pins. Use the Fault Sharing Setup Tool to configure the fault sharing in the GUI. Select the LTC2975 in
the system tree. Go to Utilities > Fault Sharing Diagram.
(For more details on this topic, please refer to the Fault
Management section in the data sheet.)
The fault sharing dialog will appear as shown in Figure
9. All Response and all Propagate switches are closed by
default. In this configuration, a fault on a channel will shut
down not only the faulted channel but all other channels
since the Propagate switches are closed.
The log contains timestamp, up-time, channel voltage
readings, an input voltage reading, an on-chip temperature
reading, etc. There will be a number of loops; each loop
12
There are two types of actions to fault conditions: How a
channel responds to another channel’s fault and whether
a particular channel propagates its fault to other channels.
FAULT pins are bi-directional, meaning the device may drive
its fault pin low (output) or may respond to the fault pin
when another device drives it low (input). Because the two
fault pins are separated on the DC2382A, this allows you
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DEMO MANUAL DC2428A
ADVANCED DEMO BOARD OPERATIONS
Figure 9. Fault Sharing Utility in LTpowerPlay GUI
Figure 10. Updated Fault Sharing Configuration
to configure the fault settings on a channel-by-channel
basis. By default, the LTC2975 is configured to shut down
its channels if the FAULT pin is low and to propagate its
own fault by driving the FAULT pin low. You can think of
the Response switches as shut this channel down when
another channel faults, and the Propagate switches as
drive the fault pin to broadcast to other channels that this
channel faulted.
(CH0) will power back up. We can now observe the effect
of changing the response setting on U0:1 (CH1). If you
short U0:3 (CH3 3.3V rail) to ground, notice that all rails
shut down except U0:1 (CH1). This is an example of a
keep-alive channel that remains powered up independent
of faults to other channels.
Fault Configuration Example
Let’s explore two different examples. Suppose we do not
want channel U0:0 (CH0 1.0V rail) to propagate its fault
to the other channels when it faults. And suppose we do
not want channel U0:1 (CH1 1.5V rail) to shut down in
response to another channel’s fault. We can configure the
switches as shown in Figure 10. Simply click the switches
to open/close. Click OK to close the dialog box.
The LTC2975 is capable of high-side current sensing of
the input power supply. This feature allows the manager
to measure input supply current. Select the READ_IIN
register to display the telemetry plot. The input current
reading will be ~160mA if all channels are enabled, preloaded, and VIN = 12V. Notice the current reading move
lower as you turn channels off.
Click the PC RAM icon to write the changes to the DC2382A.
We can now create a fault on U0:0 (CH0) by shorting
the output to ground. You may use a coin or a jumper
to temporarily connect CH0 to the GND turret. You will
notice that the channel shuts off but the other channels
remain powered up because its fault is not propagated to
the other channels. After the retry period, channel U0:0
The manager also measures input supply voltage and is
therefore able to report input power as well. Since energy
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DEMO MANUAL DC2428A
ADVANCED DEMO BOARD OPERATIONS
is the product of power and time, accumulated energy is
provided based on the manager’s internal timebase.
The meter displayed in the upper right hand corner of the
GUI provides a number of bits of information. The needle is
a real-time indicator of input power and the smaller five dials
show the total accumulated energy similar to a home electricity
meter. Digital readouts are also provided for convenience.
first select the MFR_EIN register to display the energy in
the telemetry plot. Turn off channels 2 and 3 by setting
those CTRL switches off. You will notice that the slope
has changed. The accumulated energy rate is the slope.
Energy is still being accumulating but at a lower rate since
channels 0 and 1 remain enabled. Note that the input current
has changed from about 160mA down to 48mA as seen
in the READ_IIN register. The MFR_EIN_WATTS register
displays the input power that is being drawn. This register
is the product of the READ_VIN and READ_IIN values.
Since the input voltage is 12V, the input power is 12V •
160mA or 1.92W. You can confirm this by clicking these
three registers one by one and view the telemetry window.
The DC2363A demo board has power supplies that are
capable of high current. The LTC2975 is able to monitor
and measure four outputs and its input power supply.
LTpowerPlay offers a simple and easy to understand
interface that brings together input and output current,
voltage, power, and energy readings.
The MFR_EIN and MFR_EIN_TIME registers may be reset
by right-clicking the MFR_EIN register which displays an
option menu to Clear HW Register. It may also be reset
by writing the MFR_EIN_CONFIG register.
Changing Nominal Output Voltages
You may also view the input current, input voltage, input
power, and input energy together in tabular format. These
appear in the telemetry portion of the GUI. The MFR_EIN
register holds the accumulated energy value in milliJoules.
There is also a total time that the energy accumulator has
been active and is shown as the MFR_EIN_TIME register.
The GUI will automatically update the displayed SI prefix
as the units change from mJ to J to kJ.
To demonstrate the meter readings and register values,
The nominal output voltage of any channel on the DC2363A
can be adjusted by changing feedback resistors. There
are two external resistors that set the floating voltage, a
topside feedback resistor (RTOP) and a bottom feedback
resistor (RBOT). Note that these feedback resistors provide
compensation for the IR drop of the sense resistor in the
output path.
The equation that relates feedback resistors and VOUT is
as follows:
VOUT = ((60.4k||RTOP)/RBOT + 1) • 0.6V
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DEMO MANUAL DC2428A
ADVANCED DEMO BOARD OPERATIONS
LTM4644
L
ERROR
AMP
RSENSE
L1
RFB
60.4k
C1
47µF
FB
VREF = 0.6V
ISENSE
VOUT
1.0V
RTOP
6.04k
RLOAD
RBOT
8.25k
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Figure 11. Output Voltage Set by Feedback Resistors
Use the LTpowerPlay’s Resistor Selection Tool to calculate resistor values and to display the proper DAC range
settings. The Resistor Selection Tool refers to R10, R20,
and R30. R10 is the bottom feedback resistor, R20 is the
top feedback resistor, and R30 is the DAC resistor. The
tool’s R20 value that is entered is the parallel combination
of the internal and external topside resistors. The resistor RFB is 60.4k which is inside the LTM4644 µModule.
There is an external sense resistor in the output path for
the purpose of measuring current. An external topside
feedback resistor RTOP is wired from the output turret to
the FB node. All four channels use a 6.04k RTOP feedback
resistor. These are: R78-R80. The parallel combination
(60.4k||6.04k) is 5.49k.
The bottom feedback resistors (RBOT) for each channel
are R10-R13. The output trim resolution and range can be
adjusted for any output on the DC2363A by simply changing the RDAC resistor value. The DAC resistors (R30) are
R18-R21. Table 2 on shows a summary of the feedback
resistor values and DAC resistor values.
Figure 12. LTpowerPlay’s Resistor Selection Tool
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DEMO MANUAL DC2428A
ADVANCED DEMO BOARD OPERATIONS
Tracking Outputs
The DC2363A board offers output tracking capability which
allows the startup ramp of all channels to track together.
The LTC2975 supports tracking power supplies that have
a tracking pin and are 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. Any supply that tracks a master
supply must be enabled before the master supply comes
up and disabled after the master supply comes down, so
that they will properly track the master and not produce
unwanted faults. Refer to the LTC2975 data sheet for
further description of timing rules, fault behavior, and
register configuration settings.
CTRL3
LTC2975
LTM4644
VOUT_EN3
VDAC3
RUN
VFB
TRACK
VOUT3
RUN
VFB
TRACK
VOUT2
3.3V
LOAD
CSS
VOUT_EN2
VDAC2
60.4k
LOAD
19.1k
VOUT_EN1
VDAC1
60.4k
RUN
VFB
TRACK
VOUT1
40.2k
VOUT_EN0
VDAC0
RUN
VFB
TRACK
90.9k
1.5V
LOAD
VOUT0
60.4k
2.5V
1V
LOAD
dc2428a F13
Figure 13. LTC2975 Configured for Power Supply Tracking
DC2382A’s CTRL3 switch acts as the master enable, in
addition to commanding CH3’s OPERATION register.
To demonstrate tracking:
1. Set all three TRACK jumpers to the TRK position, and
set CH3’s pre-load jumper to ON.
2. On the DC2382A board, ensure that jumper JP7 is set
to SW3.
The DC2363A and DC2382A boards are configured to
demonstrate tracking as described below. CH3 (3.3V) is
the master channel and CH0-2 are slave channels. The
3. In LTpowerPlay, select Demo>DC2382A_tracking from
the GUI’s menu.
The following register screen shots document the relevant
configuration settings.
dc2428af
16
DEMO MANUAL DC2428A
ADVANCED DEMO BOARD OPERATIONS
Cascaded Sequencing
The DC2363A/DC2382A board set also offers cascaded
sequencing capability. Cascade sequencing 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. Note that the power good signal is that of the power
supply and not derived from the LTC2975’s internal power
good processing. Power good based cascade sequence
OFF is not supported. OFF sequencing must be managed
using immediate-off or time-based sequencing. A cascade
sequence wiring diagram is shown in Figure 14. For each
slave channel, the mfr_config_cascade_on bit is set
(high) and the associated control input connects to the
power good output of the previous power supply. In this
configuration each slave channel’s startup is dependent
on the previous supply being powered up.
CONTROL0
LTC2975
FAULT90
FAULT90
CONTROL0
RECOMMENDED
CONNECTION
WHEN HARDWARE
ON/OFF CONTROL
IS REQUIRED
VOUT_EN0
VOUTP
RUN
DC/DC
CONTROL1
VOUT_EN1
POWERGOOD0 VOUTM
VOUTP
RUN
DC/DC
CONTROL2
VOUT_EN2
VOUTP
DC/DC
CONTROL3
VOUT_EN3
VOUTP
DC/DC
TO NEXT CONTROL PIN
VSENSP1
VSENSM1
VSENSP2
LOAD
POWERGOOD2 VOUTM
RUN
MASTER
VSENSM0
LOAD
POWERGOOD1 VOUTM
RUN
VSENSP0
LOAD
SLAVES
VSENSM2
VSENSP3
LOAD
POWERGOOD3 VOUTM
VSENSM3
dc2428a F14
Figure 14. LTC2975 Configured for Cascaded Sequencing
The channels cascade on/off via the CTRL0 switch on
the DC2382A board, or command CH0’s OPERATION
register on/off. The LTC2975 configuration is such that
the controln_sel bit is set to its respective channel. The
cascade_on bit is set for the three slave channels (CH1-3)
and cleared on the master channel (CH0).
To demonstrate cascade sequencing:
1. Set the three TRACK jumpers to SS on the DC2363A
board.
2. Set JP5-JP7 to the PG setting on the DC2382A board.
3. In LTpowerPlay, select Demo>DC2382A_cascade_seq
from the GUI’s menu.
dc2428af
17
DEMO MANUAL DC2428A
SETUP PROCEDURE FOR MULTI-BOARD ARRAYS
Multiple DC2428As can be combined to control as many
nine board pairs.
4. Plug the ribbon cable of the DC1613 into one of the
DC2382As.
1. Connect DC2363A/DC2382A to pair them.
5. Connect a power supply to each of the DC2363A boards.
Power is not distributed to other board pairs via the
J1/J3 cascading connector.
2. Plug DC2382A’s together.
3. Set a unique address for each DC2382A in the array
using ASEL0 and ASEL1 (JP1, JP2). See the following
section for further details.
Figure 15. Array of Multiple Board Sets
dc2428af
18
DEMO MANUAL DC2428A
SETUP PROCEDURE FOR MULTI-BOARD ARRAYS
Selecting a Device Address
The DC2382A jumpers (JP1, JP2) are labeled ASEL0
and ASEL1 which allow the user to select one of nine I2C
addresses. The I2C/SMBus address of the LTC2975 equals
the base address + N where N is a number from 0 to 8.
N is configured by setting the ASEL0 and ASEL1 pins to
VDD33, GND or FLOAT. See Table 3 below. Using one base
address and the nine different values of N, nine LTC2975s
can co-exist on the same I2C bus to control 36 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. Be careful
that the address range does not overlap with other I2C/
SMBus device or global addresses, including I2C/SMBus
multiplexers and bus buffers.
NOTE: Regardless of the jumper setting, the part will always
respond to the I2C global 7-bit address 0x5B.
Table 3. Address Selection of LTC2975
I2C ADDRESS
(7-BIT)
ASEL1
POSITION
ASEL0
POSITION
DEFAULT
0x5C
L
L
✓
0x5D
L
Z
0x5E
L
H
0x5F
Z
L
0x60
Z
Z
0x61
Z
H
0x62
H
L
0x63
H
Z
0x64
H
H
dc2428af
19
DEMO MANUAL DC2428A
PCB LAYOUT
DC2382A Top Layer
DC2382A Bottom Layer
Table 4. Default Jumper and Switch Configuration
REFERENCE DESIGNATOR
SIGNAL NAME
USAGE
DEFAULT
JP1, JP2
ASEL0, ASEL1
Set the address offset of LTC2975.
Low, Low
JP3
WRITE PROTECT
Write protect the LTC2975 EEPROM.
Off
JP4, JP5, JP6, JP7
CONTROL0, CONTROL1,
CONTROL2, CONTROL3
Jumpers that connect LTC2975 CONTROL pins to CTRL
SW0, SW1, SW2, SW3
switches or to PG signals from DC2363A board. Implement
cascade sequencing by connecting power good signals to
the control pins, or connect CONTROL pins directly to the
CTRL switches.
SW0,SW1,SW2,SW3
CTRL0, CTRL1, CTRL2, CTRL3
Switches used to enable channels. Switch behavior is
dependent on jumper settings JP4-JP7.
HI, HI, HI, HI
dc2428af
20
DEMO MANUAL DC2428A
PCB LAYOUT
DC2363A Top Layer
Table 5. Default Jumper Settings
REFERENCE DESIGNATOR
SIGNAL NAME
USAGE
DEFAULT
JP1-JP4
VOUT_CH0, VOUT_CH1,
VOUT_CH2, VOUT_CH3
Enable/Disable 100mA pre-load on CH0-CH3 outputs.
All On
JP5-JP7
TRACK0, TRACK1, TRACK2
Select Soft-Start (SS) or Tracking feature of Slave Channels All SS
(CH0-CH2).
dc2428af
21
DEMO MANUAL DC2428A
PCB LAYOUT
DC2363A Bottom Layer
dc2428af
22
DEMO MANUAL DC2428A
DC2382A PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
IC 4-CH POWER SYSTEM MANAGER 64QFN
LINEAR TECH: LTC2975IUP#PBF
Required Circuit Components
1
1
U1
Additional Demo Board Circuit Components
2
9
C1, C2, C3, C4, C6, C8, C9, C12, C15
CAP CERAMIC 0.1µF 16V X7R 0402
AVX: 0402YC104KAT2A
3
6
C5, C10, C11, C13, C14, C20
CAP 0.01µF 25V CERAMIC X7R 0402
AVX: 04023C103KAT2A
4
1
C7
CAP CER 0.1µF 25V X5R 0402
AVX: 04023D104KAT2A
5
8
C23, C24, C25, C26, C28, C29, C30, C31
CAP 2.2nF 16V CERAMIC X7R 0402
AVX: 04023C222KAT2A
6
2
D1, D6
LED GREEN HI-BRT SMD 0603
PANASONIC: LNJ326W83RA
7
4
D2, D3, D4, D5
LED RED SMD 0603
PANASONIC: LNJ237W82RA
8
1
Q1
MOSFET P-CH 20V 200MΩ SOT323-3
ON SEMI: NTS4173PT1G
9
1
Q2
MOSFET N-CH 60V 115MA SOT-23
FAIRCHILD: 2N7002
10
15
R1, R3, R4, R6-R15, R32, R34
RES 10.0k 1/10W 1% 0402 SMD
VISHAY: CRCW040210K0FKED
11
5
R2, R18, R23, R31, R36
RES 100Ω 1/10W 1% 0402 SMD
VISHAY: CRCW0402100RFKED
12
1
R5
RES 5.49k 1/10W 1% 0402 SMD
VISHAY: CRCW04025K49FKED
13
1
R16
RES 150k 1/10W 1% 0402 SMD
VISHAY: CRCW0402150KFKED
14
1
R17
RES 49.9k 1/10W 1% 0402 SMD
VISHAY: CRCW040249K9FKED
15
4
R19, R20, R27, R35
RES 100k 1/10W 1% 0402 SMD
VISHAY: CRCW0402100KFKED
16
7
R21, R24, R25, R26, R28, R30, R33 (OPT) RES 0.0Ω 1/10W 0402 SMD
DO NOT INSTALL!
17
2
R22, R29
RES 0.0Ω 1/10W 0402 SMD
VISHAY: CRCW04020000Z0ED
18
6
R37, R38, R39, R40, R41, R42
RES 1.4k 1/10W 5% 0402 SMD
VISHAY: CRCW04021K40JNED
19
1
U2
IC EEPROM 2KBIT 400Khz 8TSSOP
MICROCHIP: 24LC025-I/ST
20
2
U4, U5
IC BUFF/DVR DL NON-INV SC70-6
TEXAS INSTR: SN74LVC2G07DCKR
MILL MAX 803-43-020-20-001000
Hardware: For Demo Board Only
21
1
J1
CONN SOCKET 20POS DUAL ROW
22
1
J2
CONN HEADER 12POS 2MM STR DL PCB
FCI: 98414-G06-12ULF
23
1
J3
CONN PIN HEADER 20POS DUAL ROW
MILL MAX 802-40-020-20-001000
24
1
J4
CONN FEMALE 50POS DL 0.1" R/A GOLD
SULLINS: PPPC252LJBN-RC
25
2
JP1, JP2
CONN HEADER 4POS 2MM VERT T/H
WURTH: 620 004 111 21
26
5
JP3-JP7
CONN HEADER 3POS 2MM VERT T/H
WURTH: 620 003 111 21
27
4
MH1-MH4
SPACER STACKING #4 SCREW NYLON
KEYSTONE: 8831
28
4
SW0-SW3
SW SLIDE DPDT 6VDC 0.3A PCMNT
C&K: JS202011CQN
29
1
SW4
PUSHBUTTON SWITCH 3.5x6 100GF SMD
PANASONIC: EVQ-PJS04K
30
7
SH1-SH7
CONN SHUNT 2MM 2POS BLACK
WURTH: 608 002 134 21
31
15
TP1-TP15
TERM SOLDER TURRET 0.156"H 0.084"L
MILL MAX: 2308-2-00-80-00-00-07-0
dc2428af
23
DEMO MANUAL DC2428A
DC2363A PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
QUAD 4A BUCK REGULATOR µMODULE BGA77
LINEAR: LTM4644EY#PBF
CAP ALUM POLY 220µF 20V 20% 3.5X8
NICHICON: PLV1D221MDL1TD
Required Circuit Components
1
1
U1
Additional Demo Board Circuit Components
2
1
C1
3
4
C2, C3, C47, C48
CAP CER 22µF 25V 10% X5R 1210
MURATA: GRM32ER61E226KE15L
4
17
C4, C5, C6, C7, C21, C22, C23, C24, C37,
C38, C39, C40, C41, C42, C43, C44, C45
CAP CER 10nF 50V 10% X7R 0603
MURATA: GRM188R71E103KA01D
5
4
C8, C9, C10, C11 (OPT.)
CAP CER 0603 (OPTIONAL)
-
6
4
C12, C13, C14, C15
CAP CER 47µF 10V 20% X5R 1206
MURATA: GRM31CR61A476ME15L
7
4
C16, C17, C18, C19
CAP CER 22µF 10V 10% X7R 1210
TDK: C3225X7R1A226K230AC
8
1
C20
CAP CER 100nF 16V 10% X7R 0603
MURATA: GRM188R71C104KA01D
9
8
C25-C32 (OPT.)
CAP CER 2.2nF 50V 10% C0G 0603 (OPTIONAL)
MURATA: GRM1885C1H222JA01D
10
4
C33-C36
CAP TANT POLY 330µF 6.3V 20% 2917 (7343)
PANASONIC: 6TPF330M9L
11
1
C46
CAP CER 1µF 10V 10% X7R 0603
TAIYO YUDEN: EMK107B7105KA-T
12
2
C49, C50
CAP CER 22µF 25V 10% X5R 1206
MURATA: GRM31CR61E226KE15L
13
4
LED0, LED1, LED2, LED3
LED GREEN SS TYPE BRIGHT SMD
PANASONIC: LNJ326W83RA
14
1
M1
MOSFET DUAL N-CH 60V SOIC8
VISHAY: SI4946BEY-T1-GE3
15
4
M2, M3, M4, M5
MOSFET N-CH 30V 900MA SOT323-3
DIODES INC: DMG1012UW-7
16
1
Q1
TRANS GP NPN 40V
ON SEMI: MMBT3904WT1G
17
1
R1
RES CURRENT SENSE 0.01 1W 2512 SMD
VISHAY: WSK2512R0100FEA
18
1
R2
RES 2.1M 0.1W 1% 0603 SMD
VISHAY: CRCW06032M10FKEA
19
1
R3
RES 221k 0.1W 1% 0603 SMD
VISHAY: CRCW0603221KFKEA
20
1
R4
RES 80.6k 0.1W 1% 0603 SMD
VISHAY: CRCW060380K6FKEA
21
1
R5
RES 100k 0.1W 1% 0603 SMD
VISHAY: CRCW0603100KFKEA
22
4
R6, R7, R8, R9
RES 49.9k 0.1W 1% 0603 SMD
VISHAY: CRCW060349K9FKEA
23
1
R10
RES 1.21k 0.1W 1% 0603 SMD
VISHAY: CRCW06031K21FKEA
24
1
R11
RES 1.74k 0.1W 1% 0603 SMD
VISHAY: CRCW06031K74FKEA
25
1
R12
RES 3.65k 0.1W 1% 0603 SMD
VISHAY: CRCW06033K65FKEA
26
2
R13, R19
RES 8.25k 0.1W 1% 0603 SMD
VISHAY: CRCW06038K25FKEA
27
4
R14, R15, R16, R17
RES CURRENT SENSE 0.01 0.5W 1210 SMD
YAGEO: RL1210FR-070R01L
28
1
R18
RES 6.81k 0.1W 1% 0603 SMD
VISHAY: CRCW06036K81FKEA
29
1
R20
RES 14.3k 0.1W 1% 0603 SMD
VISHAY: CRCW060314K3FKEA
30
1
R21
RES 20.5k 0.1W 1% 0603 SMD
VISHAY: CRCW060320K5FKEA
31
4
R22-R25
RES 2.0k 0.1W 1% 0603 SMD
VISHAY: CRCW06032K00JNEA
32
1
R26
100k RESISTOR ARRAY, 4 RES, 1206
VISHAY: CRA06S083100KJTA
33
4
R27-R30
1k RESISTOR ARRAY, 2 RES, 0606
PANASONIC: EXB-V4V102JV
34
8
R31-R38
RES 100Ω 0.1W 1% 0603 SMD
VISHAY: CRCW0603100RFKEA
35
1
R39
RES 33Ω 0.5W 1% 1210 SMD
VISHAY: CRCW121033R0JNEA
36
1
R40
RES 24.9Ω 0.5W 1% 1210 SMD
VISHAY: CRCW121024R9FKEA
37
1
R41
RES 15Ω 0.5W 1% 1210 SMD
VISHAY: CRCW121015R0FKEA
38
1
R42
RES 10Ω 0.5W 1% 1210 SMD
VISHAY: CRCW121010R0JNEA
39
4
R43-R46
RES 0Ω 0.1W 0603 SMD
VISHAY: CRCW06030000Z0EA
dc2428af
24
DEMO MANUAL DC2428A
DC2363A PARTS LIST
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
40
10
R50, R52, R68-R71, R73-R76 (OPT)
RESISTOR (OPTIONAL)
VISHAY: CRCW06030000Z0EA
41
3
R53, R55, R57
RES 60.4k 0.1W 1% 0603 SMD
VISHAY: CRCW060360K4FKEA
42
1
R54
RES 19.1k 0.1W 1% 0603 SMD
VISHAY: CRCW060319K1FKEA
43
1
R56
RES 40.2k 0.1W 1% 0603 SMD
VISHAY: CRCW060340K2FKEA
44
1
R58
RES 90.9k 0.1W 1% 0603 SMD
VISHAY: CRCW060390K9FKEA
45
8
R59-R66
RES 1.0Ω 0.1W 1% 0603 SMD
VISHAY: CRCW06031R00JNEA
46
2
R67, R72 (OPT)
RES 0Ω 1W 2010 SMD (OPTIONAL)
ROHM: MCR50JZHJ000
47
4
R77-R80
RES 6.04k 0.1W 1% 0603 SMD
VISHAY: CRCW06036K04FKEA
48
1
U2
OV/UV SUPPLY PROTECTION CONTROLLER
LINEAR: LTC4365ITS8#PBF
49
1
U3
FIXED 3.3V 100mA MICROPOWER LDO
LINEAR: LT1761ES5-3.3#PBF
50
1
U4
2KBIT I2C SERIAL EEPROM SOT23-6
MICROCHIP: 24LC025T-I/OT
Hardware: For Demo Board Only
51
1
J1
POWER JACK FROM CUI INC. PJ-002A
CUI INC: PJ-002AH
52
1
J2
TERMINAL BLOCK 5mm HORZ ENTRY 2POS
WURTH: 691102710002
53
1
J3
CONN HEADER 50POS 0.050 RIGHT ANGLE
MOLEX: 90122-0785
54
7
JP1, JP2, JP3, JP4, JP5, JP6, JP7
2MM PIN HEADER 1X3
WURTH: 620 003 111 21
55
1
JP8
4POS DIP SWITCH
C&K: TDA04H0SB1R
55
4
MH1-MH4
SPACER STACKING #4 SCREW NYLON
KEYSTONE: 8831
56
7
SH1-SH7
CONN SHUNT 2MM 2POS BLACK
WURTH: 608 002 134 21
57
10
TP1-TP10
TERM SOLDER TURRET 0.219"H 0.109"L
MILL MAX : 2501-2-00-80-00-00-07-0
58
10
TP11, TP12, TP17-TP24
TERM SOLDER TURRET 0.156"H 0.084"L
MILL MAX : 2308-2-00-80-00-00-07-0
dc2428af
25
A
B
C
D
SHARE_CLK
WRITE-PROTECT
ON
OFF
JP3
R15
10.0K
VDD33
SHARE_CLK
TP2
C5
0.01µF
R2
100
5
WDI/RESETB
3
150K
R16
49.9K
R17
C6
0.1µF
VOUT_EN0
TSENSE0P
VDAC0
VIN_SNS
ISENSEP0
ISENSEM0
VSENSEP0
VSENSEM0
VOUT_EN1
TSENSE1P
VDAC1
ISENSEP1
ISENSEM1
VSENSEP1
VSENSEM1
TSENSE0M
TSENSE0P
Q1
NTS4173PT1G
2
R3
10.0K
VDD33
R6
10.0K
VDD33
CONTROL1
CONTROL0
+3.3V
NOTE:
THE NET PULLUP RESISTANCE
ON SHARE_CLK LINE SHOULD
BE BETWEEN 4.2K AND 5.5K
R5
5.49K
VDD33
RESET
SW4
WDI/RESETB
TP1
R1
10.0K
VDD33
NET TIE
C1
0.1µF
G1
NT1
D
VIN
28
18
24
38
40
3
32
15
53
9
8
41
42
1
2
4
33
16
54
60
59
43
44
63
64
4
WP
SHARE_CLK
4
C7
C8
0.1µF 0.1µF
VDD33
E-PAD
C9
0.1µF
T1
FAULTB0
FAULTB1
SCL
SDA
PWRGD
ALERTB
AUXFAULTB
ASEL0
ASEL1
VOUT_EN3
CONTROL3
TSENSE3
VDAC3
GND
VIN_SNS_CAP
ISENSEP3
ISENSEM3
VSENSEP3
VSENSEM3
VOUT_EN2
CONTROL2
TSENSE2
VDAC2
IIN_SNSM
IIN_SNSP
ISENSEP2
ISENSEM2
VSENSEP2
VSENSEM2
TSENSE1M
LTC2975
U1
C2
0.1µF
WDI/RESETB
REFP
REFM
VOUT_EN0
CONTROL0
TSENSE0
VDAC0
VIN_SNS
NC
ISENSEP0
ISENSEM0
VSENSEP0
VSENSEM0
VOUT_EN1
CONTROL1
TSENSE1
VDAC1
GND
GND
ISENSEP1
ISENSEM1
VSENSEP1
VSENSEM1
NET TIE
NT2
TSENSE1P
CHANNEL 1
CHANNEL 0
5
S
VPWR
10
VDD33
VDD33
12
11
CHANNEL 2
CHANNEL 3
VDD25(IN)
VDD25(OUT)
14
13
E-PAD
65
GND
GND
GND
GND
GND
19
20
21
37
39
26
NOTE:
MAKE ALL TSENSE
TRACES SHIELDED
AND DIFFERENTIAL
PLACE CAPS
AND GND CONNECTIONS
CAPS NEAR LTC2975
25
26
30
29
17
31
7
35
36
6
23
HI
LO
LO
FLOAT FLOAT
HI
C4
0.1µF
VDD33
CUSTOMER NOTICE
CONTROL3
JP1
ASEL0
NET TIE
NT4
3
DC2382A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
DESCRIPTION
PROTOTYPE
REV
1
2
SCALE = NONE
DATE:
N/A
SIZE
TECHNOLOGY
1
DEMO CIRCUIT 2382A
LTC2975IUP
Monday, June 22, 2015
IC NO.
SHEET 1
1
OF 3
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
FAULTB0
FAULTB1
SCL
SDA
PWRGD
ALERTB
4-CHANNEL PMBUS POWER SYSTEM MANAGER
TITLE: SCHEMATIC
SCL
AUXFAULTB
TP4
SDA
1 - ALL CHIP CAPS AND CHIP RES ARE 0402
TP3
DATE
MICHAEL P. 05-18-15
APPROVED
NOTES - UNLESS OTHERWISE SPECIFIED:
__
ECO
1
REVISION HISTORY
R8
R9
R10 R11 R12 R13
10.0K 10.0K 10.0K 10.0K 10.0K 10.0K
VDD33
2
APPROVALS
R7
10.0K
JP2
ASEL1
TSENSE3M
TSENSE3P
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.
S. M.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG. MIKE P.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
VOUT_EN3
TSENSE3P
R14 0.01µF
10.0K
34
58
CONTROL2
C20
VDAC3
TSENSE2M
R4
10.0K
ISENSEP3 VDD33
ISENSEM3
VSENSEP3
VSENSEM3
VOUT_EN2
TSENSE2P
VDAC2
IIN_SNSM
IIN_SNSP
ISENSEP2
ISENSEM2
VSENSEP2
VSENSEM2
VDD33
C3
0.1µF
TSENSE2P
52
51
47
48
49
50
5
22
27
57
56
55
45
46
61
62
NET TIE
NT3
3
A
B
C
D
DEMO MANUAL DC2428A
SCHEMATIC DIAGRAM
dc2428af
A
B
C
4
3
2
1
C12
0.1µF
U2
12
11
10
9
8
7
6
5
4
3
2
1
TP9
SDA
SCL
WP
VCC
8
5
6
7
SCL SDA
DEMO BOARD
IDENTITY EEPROM
VSS
A2
A1
A0
24LC025-I/ST
DC1613
AUXSDA
AUXSCL
GND
GPI_2
OUTEN
GPI_1
ALERTB
+3.3V
SCL
GND
SDA
+5V
J2
TURRETS
5
TP10 TP11
GROUND TEST
POINTS
USBTO I2C/SMBUS/PMBUS
HEADER 12POS 2MM VERT GOLD
R34
10.0K
D1
(GREEN)
LTC2975 ON
AUXSDA
AUXSCL
FAULTB1
FAULTB0
R37
1.40K
VDD33
R32
10.0K
4
3
2
J1
DNI
DNI
R26
R28
4
J3
DNI
R33
SHARE_CLK
WDI/RESETB
CONTROL0
CONTROL1
CONTROL2
CONTROL3
DNI
R30
0
DNI
R25
R29
DNI
R24
R22 0
ALL SIZE 0402
+3.3V
ALERTB
AUXFAULTB
PGOOD3
CUSTOMER NOTICE
1 LGKPWR
2 VIN_SNS
3 GND
4 AUXFAULTB
5 SCL
6 ALERTB
7 SDA
8 CONTROL0
9 CONTROL2
10 CONTROL3
11 WDI/RESETB
12 CONTROL1
13 SPARE3 (PGOOD)
14 SHARE_CLK
15 FAULT4
16 FAULT2
17 FAULT3
18 FAULT1
19 SPARE 4
20 GND
BUS SIGNALS:
R21 DNI
R19
100k
VDD33
PGOOD_IN
PGOOD2
PGOOD1
PGOOD0
APPROVALS
R35
100k
VDD33
R27
100k
VDD33
R20
100k
VDD33
3
DC2382A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
SCALE = NONE
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.
S. M.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG. MIKE P.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
1
3
5
7
9
11
13
15
17
19
1
3
5
7
9
11
13
15
17
19
BOARD-TO-BOARD CONNECTOR
TO CASCADE MULTIPLE DEMO BOARDS
ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN
2
4
6
8
10
12
14
16
18
20
2
4
6
8
10
12
14
16
18
20
D
2
1
CONTROL0
PG_IN SW0
SW0
CONTROL1
PG_0 SW1
SW1
CONTROL2
PG_1 SW2
SW2
CONTROL3
PG_2 SW3
SW3
DATE:
N/A
SIZE
TECHNOLOGY
1
DEMO CIRCUIT 2382A
LTC2975IUP
Monday, June 22, 2015
IC NO.
SHEET 2
1
OF 3
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
CONTROL3
CNTRL3
DEBOUNCE
C14
0.01µF
R36
100
TP8
CONTROL2
CNTRL2
R31
100
DEBOUNCE
C13
0.01µF
TP7
CONTROL1
CNTRL1
DEBOUNCE
C11
0.01µF
R23
100
TP6
CONTROL0
CNTRL0
R18
100
DEBOUNCE
C10
0.01µF
TP5
1
4-CHANNEL PMBUS POWER SYSTEM MANAGER
TITLE: SCHEMATIC
JP7
JP6
JP5
JP4
1 HI
GND 3
1 HI
GND 3
2
2
2
2
1 HI
GND
3
1 HI
GND
3
5
A
B
C
D
DEMO MANUAL DC2428A
SCHEMATIC DIAGRAM
dc2428af
27
A
B
C
D
VIN
TSENSE3P
VDAC3
VOUT_EN3
VSENSEP2
ISENSEP2
AUXSDA
TSENSE2P
VDAC2
VOUT_EN2
VSENSEP3
ISENSEP3
VSENSEP0
ISENSEP0
VIN_SNS
TSENSE0P
VDAC0
VOUT_EN0
VSENSEP1
ISENSEP1
IIN_SNSP
TSENSE1P
VDAC1
VOUT_EN1
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
TSENSE3M
PGOOD3
VSENSEM3
ISENSEM3
VSENSEM2
ISENSEM2
AUXSCL
TSENSE2M
PGOOD2
VSENSEM1
ISENSEM1
IIN_SNSM
TSENSE1M
PGOOD1
TSENSE0M
PGOOD0
VSENSEM0
ISENSEM0
5
BOARD TO BOARD
CONNECTOR
MATES WITH DC2363A
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
J4
VIN
3
2
4
C28
10n
C23
10n
D2
(RED)
R38
1.40K
U4
D3
(RED)
3
DC2382A
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
C29
10n
C24
10n
D4
(RED)
R40
1.40K
U5
ISENSEM2
ISENSEP2
C30
10n
C25
10n
Q2
D5
(RED)
R41
1.40K
2
APPROVALS
2
SCALE = NONE
DATE:
N/A
SIZE
TECHNOLOGY
C31
10n
C26
10n
TP14
FAULTB0
TP12
ALERTB
1
DEMO CIRCUIT 2382A
LTC2975IUP
Monday, June 22, 2015
IC NO.
TP15
FAULTB1
TP13
PWRGD
SHEET 3
1
OF 3
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
ISENSEM3
ISENSEP3
1
D6
(GREEN)
R42
1.40K
1
4-CHANNEL PMBUS POWER SYSTEM MANAGER
TITLE: SCHEMATIC
INPUT FILTERS FOR CURRENT SENSING
PLACE CLOSE TO LTC2975
ISENSEM1
ISENSEP1
VDD33
R39
1.40K
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.
S. M.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG. MIKE P.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
ISENSEM0
ISENSEP0
FAULTB1
FAULTB0
PWRGD
ALERTB
AUXFAULTB
C15
0.1µF
2
AUXFAULTB
SN74LVC2G07DCKR
2
ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN
4
VCC
GND
1
6
1Y
1A
1
5
2
2
FAULTB0
SN74LVC2G07DCKR
ALERTB
1
4
2Y
2A
3
VCC
GND
1
6
1Y
1A
1
5
2
2
FAULTB1
1
4
2Y
2A
3
PWR GOOD
1
3
28
2
5
A
B
C
D
DEMO MANUAL DC2428A
SCHEMATIC DIAGRAM
dc2428af
1
3
2
GND
C1
220uF/20V
R4
80.6k
R3
221k
R2
2.1M
GND
GND
C2
22uF/25V
+VIN
R5
100k
3
2
5
1
G1
S1
OV
UV
SHDN
VIN
U2
LTC4365
D1
M1
SI4946BEY
8
GATE
GND
VOUT
G2
/FAULT
S2
GND
4
GND
D2
6
7
GND
C3
22uF/25V
R1
10m
TSENSE0P
C47
C48
C49
C50
R9
49.9k
R8
49.9k
R7
49.9k
R6
49.9k
GND GND GND GND
OPERATION
MODE
CLKIN
CLKOUT
RUN_CH0
RUN_CH1
RUN_CH2
RUN_CH3
3P3V
4x 22uF/25V
DCM
CCM
R43 10k
2
1
4
3
2
1
ON
GND
C7
J3
K5
L6
K7
L4
L3
L5
J4
H6
J6
H4
H3
H5
F4
E6
F6
E4
E3
E5
C4
B6
C6
B4
B3
B5
AGND
C20
100n
AGND
R50
0
GND
TDA04H0SK1
JP8
DC2363A
OPTIONAL TEMP SENSE
Q1
R52
0
CLKIN
CLKOUT
VIN4
VIN4
SVIN4
RUN4
INTVCC4
MODE4
VIN3
VIN3
SVIN3
RUN3
INTVCC3
MODE3
VIN2
VIN2
SVIN2
RUN2
INTVCC2
MODE2
VIN1
VIN1
SVIN1
RUN1
INTVCC1
MODE1
U1
LTM4644
TEMP
F3
J2
691102710002
R45 10k
VOUT4
FB4
TRACK/SS4
COMP4
VOUT3
FB3
TRACK/SS3
COMP3
VOUT2
FB2
TRACK/SS2
COMP2
VOUT1
FB1
TRACK/SS1
COMP1
GND
C11
OPT
GND
C10
OPT
GND
C9
OPT
GND
C8
OPT
GND
C4
10n
CUSTOMER NOTICE
K6
L7
J7
K2
K1
J1
G6
H7
G7
G2
G1
F1
D6
E7
D7
D2
D1
C1
A6
B7
A7
A3
A2
A1
Quad 4A DC/DC Converter
SGND
F7
(OV/UV/Reverse)
R44 10k
4
3
2
1
5
6
7
8
GND
G3
G5
G4
H2
H1
C5
D5
D4
D3
E2
E1
B2
B1
A5
K4
K3
F5
L2
L1
J5
A4
Input Protection
R46 10k
PG1
PG2
PG3
PG4
C3
C2
F2
J2
AGND
SCALE = NONE
MTP
MTP
R21
20.5k
APP ENG.
C13
47uF/10V
C14
47uF/10V
GND
GND
B
C15
47uF/10V
+1.0V GND
R20
14.3k
+1.5V
R19
8.25k
1a
C12
47uF/10V
+2.5V GND
R18
6.81k
PCB DES.
R13
8.25k
AGND
R12
3.65k
AGND
R11
1.74k
AGND
R10
1.21k
+3.3V
-
C36
330uF
C35
330uF
C34
330uF
C33
330uF
www.linear.com
C19
22uF/10V
C18
22uF/10V
C17
22uF/10V
C16
22uF/10V
ISP0
ISM0
VDAC0
VOUT_CH0
GND
ISP1
ISM1
VDAC1
VOUT_CH1
GND
ISP2
ISM2
VDAC2
VOUT_CH2
GND
LTC CONFIDENTIAL
FOR CUSTOMER
USE ONLY
TRACK3
TRACK2
TRACK1
TRACK0
PG0
PG1
PG2
PG3
06-12-15
ISP3
ISM3
VDAC3
VOUT_CH3
GND
IIN_SNSM
IIN_SNSP
VIN_SNS
VIN
M Peters
LTM4644 Quad 4A Supply
with 50-pin Connector to Power System Manager
LTM4644
Demo Circuit 2363A
1a
R80
6.04k
10m
R17
R79
6.04k
10m
R16
R78
6.04k
10m
R15
R77
6.04k
10m
R14
Production
DEMO MANUAL DC2428A
SCHEMATIC DIAGRAM
dc2428af
29
GND
VOUT_CH0
GND
VOUT_CH1
GND
VOUT_CH2
GND
VOUT_CH3
PG0
PG1
PG2
PG3
1
LED2
R23
2k
LED1
R24
2k
1
1
1
1
1
1
1
1
1
1
SNS-
SNS+
SNS-
SNS+
SNS-
SNS+
SNS-
SNS+
100
R38 100
R37 100
R36 100
R35 100
R34 100
R33 100
R32 100
R31
C43
10n
C41
10n
C39
10n
C37
10n
GND
C44
10n
GND
C42
10n
GND
C40
10n
GND
C38
10n
NOTE: REMOVE R59-R66 FOR REMOTE SENSING
R66
R65
R64
R63
R62
R61
R60
R59
LED0
R25
2k
INT4
GND
VSNSM_CH0
VSNSP_CH0
VSNSM_CH1
VSNSP_CH1
VSNSM_CH2
VSNSP_CH2
VSNSM_CH3
VSNSP_CH3
1
M2
M3
M4
M5
DMG1012 DMG1012 DMG1012 DMG1012
LED3
R22
2k
INT3
Voltage Sense Filtering
100k
R26
R_ARRAY_4X_CRA06S
3
2
1
INT2
1
2
INT1
LED Indication
1
2
3
2
2
3
2
1
2
3
30
2
ISM0
ISP0
ISM1
ISP1
ISM2
ISP2
ISM3
ISP3
1
2
1
2
2
1
2
1
3
C25
OPT
C21
10n
GND
4
3
4
3
C31
OPT
C24
10n
C29
OPT
C23
10n
C27
OPT
C22
10n
GND
GND
GND
DC2363A
R30
2x1K
R29
2x1K
2x1K
3
4
R28
R_ARRAY_2X_ACAS0606
2x1K
4
R27
R_ARRAY_2X_ACAS0606
C32
OPT
C30
OPT
C28
OPT
C26
OPT
CUSTOMER NOTICE
ISNSM_CH0
ISNSP_CH0
ISNSM_CH1
ISNSP_CH1
ISNSM_CH2
ISNSP_CH2
ISNSM_CH3
ISNSP_CH3
Current Sense Filtering
1a
Production
GND
49
47
45
43
41
39
37
35
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
1
50
48
46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
CONN_2X25_MALE
J3
IIN_SNSP
ISNSP_CH1
VSNSP_CH1
RUN_CH0
VDAC0
TSENSE0P
VIN_SNS
ISNSP_CH0
VSNSP_CH0
AUX_SDA
ISNSP_CH2
VSNSP_CH2
VIN
RUN_CH1
VDAC1
ISNSP_CH3
VSNSP_CH3
RUN_CH2
VDAC2
RUN_CH3
VDAC3
MTP
SCALE = NONE
MTP
PCB DES.
APP ENG.
ISNSM_CH0
VSNSM_CH0
PG0
IIN_SNSM
ISNSM_CH1
VSNSM_CH1
PG1
AUX_SCL
ISNSM_CH2
VSNSM_CH2
VIN
PG2
ISNSM_CH3
VSNSM_CH3
PG3
B
GND
49
47
45
43
41
39
37
35
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
1
J4
www.linear.com
IIN_SNSP
ISNSP_CH1
VSNSP_CH1
RUN_CH0
VDAC0
TSENSE0P
VIN_SNS
ISNSP_CH0
VSNSP_CH0
AUX_SDA
ISNSP_CH2
VSNSP_CH2
VIN
RUN_CH1
VDAC1
ISNSP_CH3
VSNSP_CH3
RUN_CH2
VDAC2
RUN_CH3
VDAC3
LTM4644 Quad 4A Supply
with 50-pin Connector to Power System Manager
LTM4644
Demo Circuit 2363A
1a
50
48
46
44
42
40
38
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
Test Points/ Optional Header
ISNSM_CH0
VSNSM_CH0
PG0
IIN_SNSM
ISNSM_CH1
VSNSM_CH1
PG1
AUX_SCL
ISNSM_CH2
VSNSM_CH2
VIN
PG2
ISNSM_CH3
VSNSM_CH3
PG3
05-12-15
LTC CONFIDENTIAL
FOR CUSTOMER
USE ONLY
M Peters
Board-to-Board Connector
-
DEMO MANUAL DC2428A
SCHEMATIC DIAGRAM
dc2428af
R53
R54
GND
By default, jumpers set to SoftStart
SS
TRK
R55
C6
10n
1
2
3
JP6
SS
TRK
GND
Parallel CH2 and CH3
Parallel CH0 and CH1
RUN_CH2
COMP2
TRACK2
FB2
VOUT_CH2
RUN_CH0
COMP0
TRACK0
FB0
VOUT_CH0
DNI
DNI
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.
R67 thru R76 are 0 ohm
R76 DNI
DNI
R74 DNI
R75 DNI
R73
R72
R71 DNI
DNI
R69 DNI
R70 DNI
R68
R67
RUN_CH3
COMP3
TRACK3
FB3
VOUT_CH3
RUN_CH1
COMP1
TRACK1
FB1
VOUT_CH1
Optional Jumpers for Parallel Operation
TRACK0
TRACK1
TRACK2
60.4k
19.1k
GND
C5
10n
1
2
3
JP5
60.4k
40.2k
R56
VOUT_CH3
R57
Tracking/SoftStart Jumpers
60.4k
90.9k
R58
C7
10n
1
2
3
JP7
SS
TRK
PINHD-1X3-2MM
1
2
3
JP4
PINHD-1X3-2MM
1
2
3
JP3
PINHD-1X3-2MM
1
2
3
JP2
PINHD-1X3-2MM
1
2
3
JP1
VOUT_CH0
VOUT_CH1
VOUT_CH2
VOUT_CH3
DC2363A
CUSTOMER NOTICE
By default, jumpers set to pre-load ON
GND 10R
R42
GND 15R
R41
GND 25R
R40
GND 33R
R39
Pre-Load Jumpers
MTP
APP ENG.
SCALE = NONE
MTP
PCB DES.
AUX_SDA
AUX_SCL
VIN
1a
Production
B
GND
GND
U3
OUT 5
A0 5
A1 4
2 GND
C46
1uF
GND
www.linear.com
GND
C45
10nF
LTC CONFIDENTIAL
FOR CUSTOMER
USE ONLY
05-12-15
LTM4644 Quad 4A Supply
with 50-pin Connector to Power System Manager
LTM4644
Demo Circuit 2363A
1a
Addr 0x51
24LC025
3 SDA
VCC 6
1 SCL
U4
LT1761ES5-3.3
3 SHDN BYP 4
2 GND
1 IN
3P3V
M Peters
+3.3V LDO and
Identity EEPROM
-
DEMO MANUAL DC2428A
SCHEMATIC DIAGRAM
dc2428af
31
DEMO MANUAL DC2428A
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
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32 Linear Technology Corporation
LT 0915 • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2015
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