Linear Technology DC1540B Quick setup guide

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DEMO MANUAL DC1540B
DESCRIPTION
LTC2977 8-Channel
Power System Manager
with EEPROM
The DC1540B is a demonstration system for the LT C
®
2977
8-channel I2C/SMBus/PMBus Power System Manager
with EEPROM. It consists of 2 circuit boards namely the
DC1360B and DC1361B. The DC1360B contains all the
circuitry needed to insert the LTC2977 into a power system
and control eight power supplies. The DC1361B contains
eight power supplies (LTM4603EV) which are configured
to be controlled by an LTC2977. Together these two boards
form a sophisticated, 8-channel, digitally programmable
power supply.
ThisdemonstrationsystemissupportedbyLTpowerPlay™
software and a graphical user interface (GUI) that enables
completecontrolofalltheLTC2977features.Youcan obtain
this GUI from the website www.linear.com/ltpowerplay.
com. LTpowerPlay and the DC1540B, create a powerful
developmentenvironmentin which you can design config-
urationsettings for theLTC2977.Theconfigurationsettings
can be stored in the LTC2977 EEPROM and also in a file,
which can be used to order pre-programmed devices.
LTpowerPlay displays all of the configuration settings and
real-time measurements that the LTC2977 performs and
allows easy access to the fault log created by the LTC2977.
TheLTC2977 ontheDC1360Bcomespre-programmed with
EEPROM values appropriate for the eight power supplies
used on the DC1361B.
The LTC2977 can be configured to monitor current
on odd numbered channels. In the DC1540B, this
feature can be enabled on Channel 7 (see “Measur-
ing Current”). Channels 1 and 2 can be configured
to do coincident tracking of Channel 0 by using JP2
and JP3 (see “DC1361B Details – Top Side”). An LTC
HotSwap™circuiton the DC1361B enables the LTC2977 to
soft-start VIN and shut off VIN in response to output faults.
Multiple DC1540Bs can be cascaded together to form
a high channel count power supply (see “Multi-Board
Arrays”). This configuration demonstrates features of the
LTC2977 which allow timing and fault information to be
L, LT, LTC, LTM, Linear Technology, and the Linear logo are registered trademarks and
LTpowerPlay and Hot Swap are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
shared across multiple LTC2977s, allowing the formation
of a single, coherent power supply control system. This
configuration is easily supported by the LTpowerPlay
GUI and allows the user to configure up to 9 LTC2977s,
controlling up to 72 separate power supplies.
To get this demo system up and running, connect the
DC1540B to your computer using a DC1427A or a DC1613
(USB to I2C/SMBus/PMBus Controller). The following is
a checklist of items which you can obtain from the LTC
website or LTC Field Sales.
n USB to I2C/SMBus/PMBus Controller (DC1613A)
n LTpowerPlay GUI
n LTC2977 Resistor Selection Tool for calculating
resistors values and proper DAC range settings
(in the GUI)
LTC2977 Features
• I2C/SMBus Communication
• Configuration EEPROM
• PMBus Compliant
• Fault Logging to Internal EEPROM
• Differential Input, 16-bit ∆S ADC with less than ±0.25%
of Total Unadjusted Error Using On-Chip Reference
• Monitors Eight Output Channels and One Input Voltage
• Programmable Watchdog Timer
• 8-Channel Sequencer
• Eight 10-Bit OV/UV Supervisors
• Eight 10-Bit Margin/Trim DAC’s with Soft-Connect
• A Closed-Loop Digital Servo Accurately Trims the Outputs
• Supports Multi-Channel Fault Management
• Programmable Fault Responses
• On-Chip Digital Temperature Sensor
Design files for this circuit board are available at
http://www.linear.com/demo

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DEMO MANUAL DC1540B
Table 1. LTC2977 Performance Summary (Specifications are at TA= 25°C)
PARAMETER CONDITION VALUE
VPWR Supply Input Voltage Range 4.5V to 15V
VDD33 Supply Input Voltage Range 3.13V to 3.47V
ADC Total Unadjusted Error VIN ≥ 1V ±0.25%
ADC Voltage Sensing Input Range –0.1V to 6V
ADC Current Sensing Input Range –170mV to 170mV
ADC Voltage Sensing Resolution 0V ≤ VIN_ADC ≤ 6V 122µV/LSB
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|
15.6µV/LSB
31.25µV/LSB
62.5µV/LSB
125µV/LSB
250µV/LSB
Voltage Buffered IDAC Resolution
10 bits
Buffer gain setting 0 1.38mV/LSB
Buffer gain setting 1 2.65mV/LSB
Temperature Sensor TUE ±1°C
Voltage Supervisor Input Voltage
Range (Programmable)
VSENSEP[n] Low resolution 0 to 6V
High resolution 0 to 3.8V
VSENSEM[n] –0.1 to 0.1V
Voltage Supervisor Sensing Resolution 0V to 3.8V range: 4.096/1024 4mV/LSB
0V to 6V range: 8.192/1024 8mV/LSB
Voltage Supervisor
Total Unadjusted Error
2V < VIN_VS < 6V, Low Resolution Mode ±1.25 %
1.5V < VIN_VS < 3.8V, High Resolution Mode ±1.0 %
0.8V < VIN_VS < 1.5V, High Resolution Mode ±1.5 %
I2C Serial Clock Frequency 10kHz to 400kHz
Demo System Specifications
Table 2. Specifications-DC1361B
VOUT Name Nominal Voltage-Untrimmed
VOUT_0 3.325V ± 1.5%
VOUT_1 2.497V ± 1.5%
VOUT_2 1.989V ± 1.5%
VOUT_3 1.804V ± 1.5%
VOUT_4 1.502V ± 1.5%
VOUT_5 1.200V ± 1.5%
VOUT_6 0.999V ± 1.5%
VOUT_7 0.799V ± 1.5%
Notes:
• Loadcurrentlessthan2Aoneachoutputisrecommended.
• Max current into J11 (+12V) should be < 6A max.
• Output voltages can be margined by a minimum of
±15% from nominal with the default resistor values
on the DC1361B. These values can be easily changed.
See section Changing DC1361B Nominal Output Volt-
ages. Use the LTC2977 Resistor Selection Tool which
is accessed from LTpowerPlay.

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DEMO MANUAL DC1540B
Figure 1. Single LTC2977 Demo Setup Using DC1540B
Demo System Hardware
Hardware required:
1. PC + USB cable
2. 12V, >0.5A power supply
3. USB to I2C/SMBus/PMBus Controller
4. DC1540B = DC1360B + DC1361B
DOWNLOAD GUI TO YOUR PC
LTpowerPlay can be downloaded from www.linear.com/ltpowerplay. Complete instructions are located there.
What Can You Do With This Demo System ?
• Prototype your system. You can change the nominal
VOUT’s of the modules to match your system. You can
also change the range and resolution of margining. Set
sequencing. Set OV/UV limits. And much more!
• Create your own configuration that you can store in the
EEPROM of the LTC2977 or save to a file. This file can
be used to order pre-programmed parts.
• Test most conceivable fault scenarios. All outputs can
be shorted.

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DEMO MANUAL DC1540B
QUICK START PROCEDURE
The following procedure describes how to set up one DC1540B.
1. Remove both boards from bag.
2. Place boards on level surface. Connect boards together using the 54-pin edge connector. See below.
Figure 2. Plug Boards Together
3. On DC1360B, set jumpers and switches as follows. See also Table 3.
a. Set both SW1 and SW2 (CONTROL0 and CONTROL1) to GND.
b. Set JP5 to OFF.
c. Make sure JP6 is installed.
d. Set JP3 (ASEL0) to LO and JP2 (ASEL1) to LO.
e. Set JP4 to ON.
4. On DC1361B, set jumpers and switches as follows. See also Table 3.
a. JP1 = INSTALLED
b. JP2, JP3 = SOFT START
c. SW1 = MASTER
5. Plug in the USB to I2C/SMBus/PMBus Controller into a USB port on your PC.
6. Connect a 12V power supply with >1/2 Amp capacity to the VIN+ and VIN– inputs of the green terminal block J11
on DC1361B. Do not turn on 12V yet. Be careful to hook up polarity correctly! See Figure 5.
7. If you have a DC1427A, connect to J4 on DC1360B as shown in Figure 3.

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DEMO MANUAL DC1540B
QUICK START PROCEDURE
Figure 3. DC1427A Connection
Figure 4. DC1613 Connection

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DEMO MANUAL DC1540B
QUICK START PROCEDURE
8. Launch the LTpowerPlay GUI.
a. The GUI should identify the LTC2977. The system tree on the left hand side should look like:
b. Confirm that the LTC2977 is communicating. A green message box shows for a few seconds in the lower left
hand corner
c. In the Toolbar, click the “R” icon to read the RAM from the LTC2977. This reads the default configuration from
the RAM in the LTC2977 on the DC1360B and loads it into the GUI.
d. Save the demo board default configuration to a (*.proj) file. Click the “Save” icon and save the file. You can
chose your own filename.
9. Turn on the +12V power supply.
10. Slide the 2 black switches CONTROL 0 and CONTROL 1 to the HI position. This turns on the board.

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DEMO MANUAL DC1540B
QUICK START PROCEDURE
The System Tree on the left hand side should turn all green. All 8 green LEDs on the DC1361B should illuminate.
11. You are now ready to execute one of the LTC2977 demos embedded in the GUI or experiment with the part.
LOADING A CONFIGURATION (*.proj) FILE WITH THE GUI
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 file into the working RAM of the LTC2977.
3. To store in EEPROM, click on the STORE button. It is the icon with the “W” on it (see below).
NOTES:
1. To configure the jumpers and switches, see Tables 3, 4, 5 and 6. If using more than one LTC2977, use the ASELs
to assign different addresses for each LTC2977.
2. On DC1361B, set the MASTER/SLAVE switch to MASTER if you want the Hot Swap chip to shut off in response to
an output OV fault. To recover from shut off, you must command the channel that produced the OV off then on
with the OPERATION command or you can toggle the VinShareEnable bit in MFR_CONFIG_ALL_LTC2977 to 0 then 1.
3. When the USB to I2C/SMBus/PMBus controller power is applied, the LTC2977 will load the contents of its EEPROM
into operating RAM.
4. For help on any command, highlight the command in the GUI and press F1.
5. The LTM4603 outputs may be shorted indefinitely. This is a good way to induce UV faults.
6. If the DC1360B is used without the DC1361B, it will report an overtemperature fault because its VSENSE inputs
are floating. This may be avoided by tying the VSENSE inputs to defined voltages.

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DEMO MANUAL DC1540B
DC1540B - DETAILS (DC1360B +DC1361B)
Figure 5. DC1540B Details

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DEMO MANUAL DC1540B
DC1360B DETAILS - TOP SIDE
Figure 6. DC1360B Top Side
Table 3. DC1360B - Default Jumper Configuration. Use ASEL’s to Select I2C Address.
JP2
ASEL1
JP3
ASEL0
JP4
Write-Protect
JP5
LTC2977 Write
Protect
JP6
Share_CLK
LO LO ON OFF Installed

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DEMO MANUAL DC1540B
DC1360B DETAILS - BOTTOM SIDE
Figure 7. DC1360B Bottom Side Configuration Resistors
Table 4. Optional Configuration Resistors
REF Des Signal Usage Default Comment
R9 FAULTB10 to FAULTB01 Connect Fault Zone 0 to Fault Zone 1 INSTALLED Allows Fault Zone 0 to
Connect to Fault Zone 1
R19, R24, R29, R34 FAULT1 to FAULT4 to
FAULT00 to FAULT11
Connect LTC2977’s FAULTB Pin to
Demo Board FAULT Lines
INSTALLED Allows Faults to Propagate
Between Boards
R21, R22, R23, R25, R26, R27,
R28, R30, R31, R32, R33
FAULT 1 to FAULT 4 Connect any FAULTB Pin to any of
Fault Line: FAULT 1,2,3,4
OPEN Allows Faults to Propagate
Between Boards.
R17 ALERTB Allow DC1427A to Receive ALERTB OPEN
R65 WDI/RESET DC1427A Drives WDI/RESETB OPEN
R18 AUXP DC1427A Sources BIGPWR INSTALLED BIGPWR + LGKPWR must be
<= 100mA max TOTAL
R72 WDI/RESET DC1427A Drives WDI/RESET OPEN
R73 CONTROL0 DC1427A Drives CONTROL0 OPEN
R74 CONTROL1 DC1427A Drives CONTROL1 OPEN
Configuration resistors are on the bottom side. They allow multiple ways to make fault dependencies between boards.

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DEMO MANUAL DC1540B
Setting the Device Address
The LTC2977 can be configured to respond to one of 9
addressesforagivenMFR_I2C_BASE_ADDRESSvalue(the
factory default value base address is 7’h5C). In addition,
the LTC2977 will always respond to its global address and
Table 5. Address Look-up Table
Description HEX Device
Address
Binary Device Address Address Pins
7’h 8’h 6 5 4 3 2 1 0 R/W ASEL1 ASEL0
Alert Response 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
*0 5C B8 1 0 1 1 1 0 0 0 L L
1 5D BA 1 0 1 1 1 0 1 0 L NC
2 5E BC 1 0 1 1 1 1 0 0 L H
3 5F BE 1 0 1 1 1 1 1 0 NC L
4 60 C0 1 1 0 0 0 0 0 0 NC NC
5 61 C2 1 1 0 0 0 0 1 0 NC H
6 62 C4 1 1 0 0 0 1 0 0 H L
7 63 C6 1 1 0 0 0 1 1 0 H NC
8 64 C8 1 1 0 0 1 0 0 0 H H
H = Tie to VDD33; NC = No Connect, Open or Float; L = Tie to GND; X = Don’t Care
* MFR_I2C_BASE_ADDRESS = 7‘h5C (factory default). LO = L
the PMBus Alert Response address regardless of the state
of the address select pins.
By connecting each of the address inputs to VDD33, GND,
or by floating them, the user determines the slave address,
as shown in Table 5.
DC1360B DETAILS - BOTTOM SIDE

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DEMO MANUAL DC1540B
DC1361B DETAILS - TOP SIDE
Table 6. DC1361B - Default Jumper and Switch Configurations
JP1
VIN_SNS
JP2
Track VOUT_0/Soft-Start
JP3
Track VOUT_0/Soft-Start
Installed = Master Removed = Slave Soft-Start Soft-Start
SW1
Master Slave
JP2, JP3 in soft start position allows VOUT1, VOUT2 to
start up with their turn on ramp determined by their soft-
start caps. Their sequence position is determined by the
LTC2977.In TRACK_VOUT_0 position,theycoincidenttrack
to VOUT_0. TON_DELAY for all tracking channels must be
equal. SW1 in the MASTER position allows the Hot Swap
Figure 8. DC1361B Top Side
circuit to ramp up the VIN and also allows the LTC2977
to open the series MOSFET in case of an Overvoltage on
any output. SW1 in SLAVE position defeats the hot swap
and passes VIN through so multiple DC1361Bs can be
cascaded in an array.

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DEMO MANUAL DC1540B
DC1361B - CHANGING THE NOMINAL OUTPUT VOLTAGES
The Nominal VOUT of any channel on the DC1361B can be
changed by changing the RSET resistor from VFB to SGND.
These are: R21, R26, R29, R38, R48, R67, R73, R79. See
Figure 9. The value for the RSET resistor is:
RSET = 60.4k/((VOUT/0.6) –1))
See also the LTM4603 datasheet Table 2. VOUT0 may be
adjusted up to 5V. The other channels may be adjusted
up to 4V.
Figure 9. DC1361B Output Voltage Setting Resistor Locations

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DEMO MANUAL DC1540B
DC1361B – ADJUSTING THE MARGIN/TRIM RANGE AND RESOLUTION
OF THE OUTPUT VOLTAGES
The resolution and range can be adjusted for any output
on the DC1361B by simply replacing the below resistors.
Usethe LTC2977 Resistor Selection Tool(spreadsheet)for
calculatingresistorsvalues and proper DAC range settings.
The design tool refers to R20. This is the upper divider
resistor which is 60.4kΩ inside the LTM4603.
The design tool refers to R10. This is the lower divider
resistor which is RSET (See Figure 9).
The design tool refers to R30. This is the margin/trim
adjustment resistor.
On the DC1361B, the lower divider resistors (R10) are =
RSET for each channel = R21, R26, R29, R38, R48, R67,
R73, R79.
On the DC1361B, the adjustment resistors (R30) are =
R55, R56, R57, R58, R59, R68, R74 and R80.
Figure 10. Margin/Trim Resistor Locations
CHANGE THESE RESISTORS TO ADJUST THE MARGIN RANGE/RESOLUTION

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DEMO MANUAL DC1540B
MEASURING CURRENT
It is possible to measure the current on Channel 6 by using
Channel 7 in “Hi Res” mode. Follow the instructions on
pp.9 and 10 of DC1361B schematic. Remove R88, R89
and move them to R86, R87. Also remove the preload
resistor R75 (top side) on DC1361B schematic p.9 to
measure only the current going out of the board.
One simple checkbox in the GUI sets up Channel 7 to mea-
surecurrent.Inthe MFR_CONFIG_LTC2977 register check
the box that says “adc_hires”. Apply a load between the
big turrets 1.0V and GND on VOUT_6 and read the voltage
across the 10mΩ current sense resistor by viewing the
READ_VOUT register on Channel 7 in the GUI.
Figure 11. Current Sensing Modifications (Bottom Side of Board)

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DEMO MANUAL DC1540B
COMMON DEMO BOARD OPERATIONS
Figure 12. GUI Fault Sharing Setup Tool
Reset the LTC2977
To reset the LTC2977 and reload the EEPROM contents
into operating memory (RAM), press SW3.
DC1360B LEDs
The Red ALERTB LED indicates a fault has occurred. The
Green LED indicates the status of the PWRGD signal.
DC1361B Remote Sense
Remote sense Test Points are included for channels 1-7.
There is no remote sense for Channel 0.
Faulting an Output
Use a jumper wire or a coin to short any output. For an OV
fault, short a lower voltage to a higher one momentarily.
Fault Sharing Setup in GUI
Usethe FaultSharingDiagram Tooltosetup the faultsharing
in the GUI. Before doing so, view the fault sharing Demo
in the GUI. Go to Tools > Fault Sharing Diagram.

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DEMO MANUAL DC1540B
FAULT ZONE CONFIGURATION AND FAULT PROPAGATION
The LTC2977 has four FAULTB pins within two fault zones.
Each channel can pull FAULTB pins within its zone low.
Also, any channel can shutdown in response to FAULTB
pins within its zone, therefore, dependencies between any
channel(s) can be established. See Applications section
of the datasheet. See Figure below. Zone 0 and 1 are tied
together on the DC1360B through R9. Therefore, any
channel can shut off in response to any other channel
on the LTC2977. Additionally, each FAULTBz pin ties to a
FAULTn (n =1,2,3,4) line on the DC1360B which is bussed
Figure 13. Fault Zones and Fault Pins on DC1360B
to other DC1360B’s in a multiboard array. Therefore, it is
possible for any channel in an array to shutoff in response
to any other channel.
FAULTn lines are on p.2 DC1360B schematic J2, J3.
To disconnect Fault zone 0 from Fault zone 1, remove R9
on DC1360B.

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DEMO MANUAL DC1540B
SETUP PROCEDURE FOR MULTI-BOARD ARRAYS
Multiple DC1540Bs can be combined to control as many
output voltages as desired.
1. Connect DC1360B’s to DC1361B’s.
2. Solder wires from the +12V and GND turrets of Master
DC1361B and connect into the terminal block of the
Slave board.
3. Leave JP1 INSTALLED in the first (Master) board.
Remove JP1 jumpers from all others (Slaves).
4. Plug DC1360B’s together. J3 to J2.
5. Set the Master/Slave switch on the first DC1361B in
the array to Master. Set other boards to Slave.
6. Set a unique address for each LTC2977 in the array
using ASEL0 (JP3) and ASEL1 (JP2).
7. Plug the ribbon cable of the DC1427A into J4 OR
DC1613 into J6 of any DC1360B.
8. Hook up power supply (5-14V, at least 0.5A times the
number of boards) to J11 Terminal Block to power the
array of modules.
Figure 14. Array of Multiple Demo Boards

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DEMO MANUAL DC1540B
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components1
1 1 U1 IC 8-CH PWR SYSTEM MANAGER 64-QFN LINEAR TECH: LTC2977IUP
2 3 C8, C9, C10 CAP CERM 0.1µF 16V 20% X7R 0603 AVX: 0603YC104MAT2A
3 6 R1, R2, R4, R5, R11, R75 RES 10k 1/10W 5% 0603 SMD VISHAY: CRCW060310K0JNEA
Additional Demo Board Circuit Components2
4 1 C11 CAP CERM 0.1µF 16V 20% X7R 0603 AVX: 0603YC104MAT2A
5 4 C12, C16, C17, C39 CAP CERM 10nF 50V 10% X7R 0603 AVX: 06035C103KAT2A
6 2 C14, C15 CAP CERM 1µF 25V 10% X7R 1206 AVX: 12063C105KAT2A
7 2 C48, C56 CAP CERM 0.47µF 16V 10% X5R 0603 AVX: 0603YD474KAT2A
8 1 C58 CAP TANT 3.3µF 25V 20% SMD AVX: TAJC335M025R
9 1 C59 CAP TANT 1µF 35V 20% SMD KEMET: B45196H6105M109
10 1 D1 LED RED DIFF SMD 0805 PANASONIC: LN1271RTR
11 1 D2 LED GREEN CLEAR 0805 SMD PANASONIC: LN1371SGTRP
12 1 Q1 MOSFET N-CH 60V 115MA SOT-23 FAIRCHILD: 2N7002_NL
13 3 R3, R6, R7 RES 10k 1/10W 5% 0603 SMD VISHAY: CRCW060310K0JNEA
14 1 R8 RES 75Ω 1/10W 5% 0603 SMD VISHAY: CRCW060375R0JNEA
15 20 R9, R18, R35, R36, R37, R38, R39, R40, R41, R43,
R44, R45, R46, R47, R48, R49, R61, R63, R64, R70
RES 0.0Ω 1/10W 5% 0603 SMD VISHAY: CRCW06030000Z0EA
16 1 R10 RES 200Ω 1/10W 1% 0603 SMD VISHAY: CRCW0603200RFKEA
17 3 R12, R13, R14 RES 4.99k 1/10W 1% 0603 SMD VISHAY: CRCW06034K99FKEA
18 15 R15, R16, R42, R50, R51, R52, R53, R54, R55, R56,
R57, R58, R59, R60, R62
RES 100Ω 1/10W 1% 0603 SMD VISHAY: CRCW0603100RFKEA
19 14 R17, R20, R21, R22, R23, R25, R26, R27, R28, R30,
R31, R32, R33, R65 (OPT)
RES 0.0Ω 1/8W 5% 0805 SMD VISHAY: CRCW08050000Z0EA
20 7 R19, R24, R29, R34, R72, R73, R74 RES 0.0Ω 1/8W 5% 0805 SMD VISHAY: CRCW08050000Z0EA
21 4 R66, R67, R68, R69 RES 20k 1/10W 5% 0603 SMD VISHAY: CRCW060320K0JNEA
22 1 R71 RES 10Ω 1/10W 1% 0603 SMD VISHAY: CRCW060310RFKEA
23 2 SW1, SW2 SWITCH SLIDE SPDT 30V 0.2A PC MNT E-SWITCH: EG1218
24 1 SW3 SWITCH TACT MINI PB SPST SLV GWING C&K: KSR211GLFS
25 1 U2 IC REG 3.3V 100MA LDO LN SOT23-5 LINEAR TECH: LT1763CS8-3.3
26 1 U3 IC, SERIAL EEPROM MICROCHIP: 24LC025-I/ST
Hardware—For Demo Board Only
27 1 J1 CONN FEMALE 54POS DL 0.1 R/A TIN SULLINS: PPTC272LJBN-RC
28 1 J2 CONN SOCKET 20 DUAL ROW RA MILL-MAX: 803-93-020-20-001
29 1 J3 PIN HEADER 20 DUAL ROW RA MILL-MAX: 802-40-020-20-001
30 1 J4 HEADER 14POS 2MM VERT GOLD MOLEX: 87831-1420
31 1 J6 CONN HEADER 12POS 2MM STR DL PCB FCI: 98414-G06-12ULF
32 5 JP2-SH, JP3-SH, JP4-SH, JP5-SH, JP6-SH CONN SHUNT 2MM 2POS GOLD BLACK SAMTEC: 2SN-BK-G
33 4 MTG1, MTG2, MTG3, MTG4 STAND-OFF NYLON 1/4" SNAP IN KEYSTONE: 8831
34 18 TP01, TP02, TP03, TP04, TP05, TP06, TP07, TP08,
TP09, TP10, TP11, TP12, TP13, TP15, TP16, TP17,
TP18, TP19
TP TURRET SMALL FOR 0.063 HOLE MILL-MAX: 2308-2-00-44-00-00-
07-0
35 0 OPTIONAL CONN HEADER BRKWAY (OPT) OPTION
Notes:
1. Required Circuit Components are those parts that are required to implement the circuit function.
2. Additional Demo Board Circuit Components are those parts that provide added functionality for the demo board but are not required in the actual circuit.

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SCHEMATIC DIAGRAM
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
ALERTB
+3.3V
+3.3V
+3.3V
+3.3V
+3.3V
VDACP0 VDACM0
VOUT_EN0
VIN_SNS
CONTROL1
SDA SCL
CONTROL0
VIN_EN
VOUT_EN1 VOUT_EN2 VOUT_EN3 VOUT_EN4 VOUT_EN5 VOUT_EN6 VOUT_EN7
VDACP1 VDACM1 VDACP2 VDACM2 VDACP3 VDACM3 VDACP4 VDACM4 VDACP5 VDACM5 VDACP6 VDACM6 VDACP7 VDACM7 PWRGD
FAULTB00 FAULTB01 FAULTB10 FAULTB11
WDI/RESETB
VSENSEP0 VSENSEM0 VSENSEP1 VSENSEM1 VSENSEP2 VSENSEM2 VSENSEP3 VSENSEM3 VSENSEP4 VSENSEM4 VSENSEP5 VSENSEM5 VSENSEP6 VSENSEM6 VSENSEP7 VSENSEM7
ALERTB
SHARE_CLK
SIZE DATE:
DWG NO.
REV
SHEET OF
TITLE:
CONTRACT NO.
APPROVALS
DRAWN: CHECKED: APPROVED: ENGINEER: DESIGNER:
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
A
DC1360B
Thursday, August 01, 2013 1 4
LTC2977IUP
CHRIS P.
DAVE C.
B
LTC2977 8-CHANNEL PM BUS POWER SYSTEM MANAGER
SIZE DATE:
DWG NO.
REV
SHEET OF
TITLE:
CONTRACT NO.
APPROVALS
DRAWN: CHECKED: APPROVED: ENGINEER: DESIGNER:
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
A
DC1360B
Thursday, August 01, 2013 1 4
LTC2977IUP
CHRIS P.
DAVE C.
B
LTC2977 8-CHANNEL PM BUS POWER SYSTEM MANAGER
SIZE DATE:
DWG NO.
REV
SHEET OF
TITLE:
CONTRACT NO.
APPROVALS
DRAWN: CHECKED: APPROVED: ENGINEER: DESIGNER:
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
A
DC1360B
Thursday, August 01, 2013 1 4
LTC2977IUP
CHRIS P.
DAVE C.
B
LTC2977 8-CHANNEL PM BUS POWER SYSTEM MANAGER
TO OTHER LTC2977's (SHEET 2)
CONTROL1
CONTROL0
PCB LAYOUT NOTES: PLACE BYPASS CAPS C8 AND C10 AS CLOSE TO U1 AS POSSIBLE. PLACE C9 VERY NEAR U1 PINS 34 & 35
CONTROL1
CONTROL0
POWER GOOD
LOLO HIHI
WDI/RESETB
TANT. 35V
VIN_SNS_IN
HI HI GND GND
ON OFF
LTC2977 WRITE- PROTECT
ALERTB
JP2
ASEL1
JP2
ASEL1
D2D2
TP9TP9
R70 0R70 0
R5 10K R5 10K
U1
LTC2977 IUP
U1
LTC2977 IUP
VOUT_EN4 8 VOUT_EN5 9 VOUT_EN6 10 VOUT_EN7 11
VIN_EN 12
NC 13
VIN_SNS
14
VPWR 15
VDD33_OUT 16
VDD33_IN 17
VDD25 18
WP
19 PWRGD 20
SHARE_CLK
21
WDI/RESET
22
FAULTB00
23
FAULTB01
24
FAULTB10
25
FAULTB11
26
SDA
27 SCL 28
ALERTB 29
CONTROL0
30
CONTROL1
31
ASEL0
32
ASEL1
33
REFP 34
REFM 35
VSENSEP0
36
VSENSEM0
37
VDACM0 38
VDACP0 39 VDACP1 40
VDACM1 41
VSENSEP1
42
VSENSEM1
43
VDACP2 44
VDACM2 45
VSENSEP2
46
VSENSEM2
47
VSENSEP3
48
VSENSEM3
49
VDACP3 50
VDACM3 51
VSENSEP4
52
VSENSEM6
1
VSENSEP7
2
VSENSEM7
3
VOUT_EN0 4 VOUT_EN1 5 VOUT_EN2 6 VOUT_EN3 7
VSENSEM4
53
VDACM4 54
VDACP4 55 VDACP5 56
VDACM5 57 VDACM6 58
VDACP6 59 VDACP7 60
VDACM7 61
VSENSEP5
62
VSENSEM5
63
VSENSEP6
64
E-PAD
65
TP11TP11
C8 100nF C8 100nF
R15 100R15 100
C59 1.0uF C59 1.0uF
Q1
2N7002
Q1
2N7002
R60 100R60 100
R1 10K R1 10K
TP8TP8
R11 10K R11 10K
R71 10R71 10
TP17TP17
R63 0 R63 0
TP13TP13 TP1TP1
TP16TP16 TP6TP6
R9 0R9 0
TP7TP7
JP5JP5
R64
0
R64
0
R75 10K R75 10K
C16 0.01uF C16 0.01uF
R8 75 R8 75
R16 100R16 100
SW1SW1
R59 100 R59 100
R6 10K R6 10K
R4 10KR4 10K SW3SW3
JP6
SHARE_CLK
JP6
SHARE_CLK
R7 10K R7 10K
C17 0.01uF C17 0.01uF
JP3
ASEL0
JP3
ASEL0
C10 100nF C10 100nF
TP12TP12
TP15TP15
SW2SW2
C9 100nF C9 100nF
R3 10K R3 10K
TP10TP10
R2 10K R2 10K
D1D1
R10 200 R10 200
C12
0.01uF
C12
0.01uF