Analog Devices LTC7131-1 User manual

1
DEMO MANUAL
DC2824A-A
Rev. 0
DESCRIPTION
LTC7131-1
25A Monolithic Synchronous DC/DC Step-
Down Converter with PMBus Interface
Demonstration circuit 2824A-A is a single output buck
converter with 4.5V to 20V input voltage range featuring
the LTC
®
7131-1, a 25A monolithic synchronous step-
down converter with a PMBus interface. The output volt-
age is adjustable from 0.4V to 4V and the converter can
supply up to 25A of load current.
The DC2824A-A powers up to default settings and pro-
duces power based on configuration resistors without the
need for any serial bus communication, which allows easy
evaluation of the DC/DC converter.
To fully explore the extensive power system manage-
ment features of the part, download the GUI software
LTpowerPlay
®
onto your PC and use ADI’s USB-to-PMBus
dongle DC1613A to connect to the board.
All registered trademarks and trademarks are the property of their respective owners.
BOARD PHOTO
LTpowerPlay allows users to monitor fault status and
real-time telemetry of input and output voltages, input
and output current, and internal IC die temperature.
Programmable parameters include device address, out-
put voltage, on/off control, and fault response to output
overvoltage and output overcurrent.
The LTC7131-1 data sheet gives a complete description
of this part, its operation and application information and
must be read in conjunction with this quick start guide
for DC2824A-A.
Design files for this circuit board are available.

2
DEMO MANUAL
DC2824A-A
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2824A-A is easy to set up to evalu-
ate the performance of the LTC7131-1. Refer to Figure1
for the proper measurement equipment setup and follow
the procedure below.
1. With power off, connect the input power supply to
V
IN
(4.5V to 20V) and GND (input return). Make sure
the input power supply is capable of 25A at 4.5V
(to satisfy the power requirement at 4V out with
25Aload).
2. Connect the 1V output load between VOUT and GND
(Initial load: no load).
3. Connect the DVMs to the input and outputs. Set
default jumper position: RUN_MSTR(JP1): ON;
RUN_STBY(JP3): ON;MODE(JP2): FCM;
MARGIN (JP4): NOM;ILIM(JP9): 25A;VOUT
SEL:JP6. WP(JP5):OFF.
4. Turn on the input power supply and check for the
proper output voltages. VOUT should be 1V ± 0.5%.
5. Once the proper output voltage is established, adjust
the load within the operating range and observe
the output voltage regulation, ripple voltage and
otherparameters.
6. Connect the dongle and control the output voltage
from the GUI. See LTpowerPlay for LTC7131-1 Quick
Start Procedure section for details.
PERFORMANCE SUMMARY
Specifications are at TA= 25°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 4.5 12 20 V
Output Voltage, VOUT VIN = 4.5V to 20V, IOUT = 0A to 25A 0.4 1 4 V
Maximum Output Current, IOUT VIN = 4.5V to 20V, VOUT = 0.4V to 4V 25 A
Typical Efficiency VIN =12V, VOUT = 1V, IOUT = 25A, fSW = 480kHz 87.7 (See Figure3) %
VIN =12V, VOUT = 1.8V, IOUT = 25A, fSW = 480kHz 91.4 (See Figure3) %
Default Switching Frequency 480 kHz
Notes
1. When measuring the output or input voltage
ripple, do not use the long ground lead on the
oscilloscope probe. See Figure1 for the proper
scope probe technique. Short, stiff leads need
to be soldered to the (+) and (−) terminals of an
output capacitor. The probe’s ground ring needs
to touch the (−) lead and the probe tip needs to
touch the (+) lead.
+ –
VOUT GND
COUT
Figure1. Measuring Output Voltage Ripple
A BNC test terminal (J5) is also implemented on
board to measure output voltage and its ripple
for the convenience of evaluation.
2. The default 215nH inductor installed on this
demo board is chosen based on 1V and 1.8V
output at 480kHz default switching frequency.
However, when changing the output voltage and/
or switching frequency, please determine if the
inductance is still suitable by calculating the
peak-peak inductor current ripple and make sure
it stays at 30% to 50% of load current. Refer
to the Inductor Selection section of LTC7131-1
data sheet for more information.

3
DEMO MANUAL
DC2824A-A
Rev. 0
TEST SETUP DIAGRAM
Figure2. Proper Measurement Equipment Setup

4
DEMO MANUAL
DC2824A-A
Rev. 0
TEST RESULTS
Figure3. Efficiency vs load Current with VIN = 12V, fSW = 480kHz
Figure4. VOUT Voltage Ripple
Figure5. VOUT Load Transient Response
OUTPUT LOAD CURRENT (A)
0
5
10
15
20
25
65
70
75
80
85
90
95
100
EFFICIENCY (%)
dc2824a-a F01
0.65VOUT
0.8VOUT
1VOUT
1.2VOUT
1.8VOUT
3.3VOUT
2µs/DIV dc2824a-a G04a
VOUT
5mV/DIV
VIN = 12V, IOUT = 25A, fSW = 480kHz
(a) VOUT = 1V
2µs/DIV dc2824a-a G04b
VOUT
5mV/DIV
VIN = 12V, IOUT = 25A, fSW = 480kHz
(b) VOUT = 1.8V
100µs/DIV dc2824a-a G05a
VOUT
20mV/DIV
VIN = 12V, fSW = 480kHz
LOAD STEP
0A TO 6.25A
10A/DIV
(a) VOUT = 1V
100µs/DIV dc2824a-a G05b
VOUT
20mV/DIV
VIN = 12V, fSW = 480kHz
LOAD STEP
0A TO 6.25A
10A/DIV
(b) VOUT = 1.8V

5
DEMO MANUAL
DC2824A-A
Rev. 0
LTpowerPlay SOFTWARE GUI
THERMAL IMAGE
An example thermal image shows the temperature distri-
bution on DC2824A-A. The test is done in still air at room
temperature (23°C). Figure6 shows a thermal image of
DC2824A-A operating at 12VIN configured for a 1V 25A
(25W) output load. No heat sink or forced airflow is used
for the measurements.
Figure6. Thermal Measurement at VIN = 12V, VOUT = 1V, IOUT = 25A, fSW = 480kHz, TA= 23°C, No Airflow
LTpowerPlay is a powerful Windows-based development
environment that supports Analog Devices power system
management ICs and μModules
®
, including LTM
®
4675,
LTM4676, LTM4677, LTM4678, LTM4680, LTM4700,
LTM4664, LTC3880, LTC3882, LTC3883, LTC3884,
LTC7880 and LTC7131-1. The software supports a variety
of different tasks. You can use LTpowerPlay to evaluate
Analog Devices ICs by connecting to a demo board sys-
tem. LTpowerPlay can also be used in an off-line 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 LTM4675,
LTM4676, LTM4677, LTM4678, LTM4680, LTM4700,
LTM4664, LTC3880, LTC3882, LTC3883, LTC3884,
LTC7880 and LTC7131-1’s 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 here.
To access technical support documents for digital power
products, visit the LTpowerPlay Help menu. Online help
is also available through the LTpowerPlay.

6
DEMO MANUAL
DC2824A-A
Rev. 0
LTpowerPlay FOR LTC7131-1 QUICK START PROCEDURE
The following procedure describes how to use LTpowerPlay
to monitor and change the settings of LTC7131-1.
1. Download and install the LTPowerPlay GUI.
2. Connect the DC2824A-A board to the USB port of
the PC or laptop through the DC1613A dongle.
3. Launch the LTpowerPlay GUI.
a. The GUI should automatically identify the dongle
connected as shown in the picture below. Select
“Detect Chips”to allow LTpowerPlay to detect
the LTC7131-1.
b. After LTC7131-1 is detected, the LTpowerPlay
main interface appears as shown in Figure7,
and a message box like below also shows for a
few seconds in the lower left-hand corner, con-
firming that LTC7131-1 is communicating.
Figure7. LTpowerPlay Main Interface

7
DEMO MANUAL
DC2824A-A
Rev. 0
LTpowerPlay FOR LTC7131-1 QUICK START PROCEDURE
c. The LTC7131-1 supports telemetry read-back
within the LTpowerPlay which allows read-back
of input/output voltages and currents as well as
the device temperature, as shown below.
d. The LTC7131-1 features the PMBus Lite with
a reduced command list as shown below. The
available commands include immediate/soft
turn-off, turn-on or returning to normal opera-
tion, margining output voltage high or low, and
choosing the fault response modes.
e. Here is an example of margining the output volt-
age high. First, enter the desired margin-high
percentage (25%) in the MFR_VOUT_MARGIN_
HIGH field, under “Output Voltage”tab. Note
that the percentage must be within the range of
−25% to 25% for both margin-high and mar-
gin-low commands.
f. Then, select the “MarginHigh”operation from
the “On/off Control and Margining” tab.
g. Next, click the “W” (PC to RAM) icon to write
these register values to the LTC7131-1. Please
make sure that the WP jumper (JP5) is at
“OFF”position.
After finishing this step, if the write is success-
ful, you will see the following message, and the
output voltage will become 25% higher than its
nominal value.

8
DEMO MANUAL
DC2824A-A
Rev. 0
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit
1 1 C1 CAP., 47pF, C0G, 50V, 5%, 0603 VISHAY, VJ0603A470JXAAC
2 1 C2 CAP., 4700pF, X7R, 50V, 10%, 0603 AVX, 06035C472KAT2A
3 1 C3 CAP., 0.01µF, X7R, 25V, 10%, 0603 AVX, 06033C103KAT2A
4 1 C4 CAP., 47pF, X7R, 50V, 10%, 0603 AVX, 06035C470KAT2A
5 2 C5, C9 CAP., 0.1µF, X7R, 50V, 10%, 0603 AVX, 06035C104KAT2A
6 1 C7 CAP., 1µF, X7R, 25V, 10%, 0603 KEMET, C0603C105K3RACTU
7 2 C11, CIN8 CAP., 4.7µF, X5R, 25V, 20%, 0603 MURATA, GRM188R61E475ME11D
8 1 C41 CAP., 2.2µF, X7R, 25V, 10%, 0805 SAMSUNG, CL21B225KAFNNNE
9 1 C42 CAP., 0.1µF, X7R, 25V, 10%, 0603 AVX, 06033C104KAT2A
10 3 CIN1, CIN3, CIN5 CAP., 22µF, X5R, 25V, 10%, 1206 AVX, 12063D226KAT2A
11 2 CIN2, CIN4 CAP., 33µF, ALUM POLY, 25V, 20%, 7343 PANASONIC, EEFCX1E330R
12 4 CIN6, CIN7, CIN9,
CIN10
CAP., 10µF, X7R, 25V, 10%, 1210 AVX, 12103C106KAT2A
13 2 COUT1, COUT8 CAP., 100µF, X5R, 6.3V, 20%, 1210 MURATA, GRM32ER60J107ME20L
14 3 COUT5-COUT7 CAP., 330µF, ALUM POLY, 4V, 20%, 7343 PANASONIC, EEF-SX0G331XE
15 1 D1 LED, GREEN, WATER CLEAR, 0603 WURTH ELEKTRONIK, 150060GS75000
16 1 D2 LED, RED, WATER CLEAR, 0603 WURTH ELEKTRONIK, 150060RS75000
17 1 D3 DIODE, SCHOTTKY, 30V, 100mA, SOD-323 CENTRAL SEMI., CMHSH-3 TR
18 4 J2, J6-J8 EVAL BOARD STUD HARDWARE SET, #10-32 ANALOG DEVICES, 720-0010
19 1 L1 IND., 215nH, PWR, FERRITE, 10%, 61A, 0.29mΩ, 10.4mm
× 8.0mm SMD
EATON, FP1007R3-R22-R
20 1 Q1 XSTR., MOSFET, P-CH, 20V, 5.9A, TO-236 (SOT23-3) VISHAY, Si2365EDS-T1-GE3
21 1 Q2 XSTR., MOSFET N-CH, 60V, 300mA, SOT-23 VISHAY, 2N7002K-T1-GE3
22 1 Q15 XSTR., MOSFET, N-CH, 30V, 30A, LFPAK RENESAS, RJK0305DPB-00#J0
23 1 R1 RES., 1k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06031K00FKEA
24 6 R2, R6, R19, R22,
R29, R30
RES., 0Ω, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA
25 1 R4 RES., 6.04k, 1%, 1/10W, 0603, AEC-Q200 KOA SPEER, RK73H1JTTD6041F
26 2 R7, R20 RES., 10Ω, 1%, 1/10W, 0603 VISHAY, CRCW060310R0FKEA
27 5 R8-R10, R12, R58 RES., 10k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060310K0FKEA
28 1 R11 RES., 10k, 0.1%, 1/8W, 0603, ANTI-SULFUR, AEC-Q200 VISHAY, TNPW060310K0BEEA
29 1 R13 RES., AEC-Q200, 2.2Ω, 1%, 1/10W, 0603 NIC, NRC06F2R20TRF
30 2 R15, R16 RES., 4.99k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF4991V
31 1 R18 RES., 18k, 0.1%, 1/10W, 0603, AEC-Q200 VISHAY, TNPW060318K0BEEA
32 1 R27 RES., 200Ω, 1%, 1/10W, 0603 VISHAY, CRCW0603200RFKEA
33 1 R28 RES., AEC-Q200, 127Ω, 1%, 1/10W, 0603 NIC, NRC06F1270TRF
34 1 R68 RES., 0.01Ω, 1%, 1W, 2512, METAL, SENSE PANASONIC, ERJM1WSF10MU
PARTS LIST

9
DEMO MANUAL
DC2824A-A
Rev. 0
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
35 1 U1 IC, 25A MONOLITHIC SYNCHRONOUS DC/DC STEP-DOWN
CONVERTER WITH PMBus INTERFACE, BGA
ANALOG DEVICES, LTC7131IY-1#PBF
36 1 U2 IC, MEMORY, EEPROM, 2Kb (256×8), TSSOP-8, 400kHz MICROCHIP, 24LC025-I/ST
Additional Demo Board Circuit Components
1 0 C6, C43 CAP., OPTION, 0603
2 0 C8, COUT2,
COUT9-COUT12
CAP., OPTION, 1210
3 0 L2 IND., OPTION
4 0 R3, R5, R14, R17,
R21, R23-R26,
R33, R34,
R69-R71
RES., OPTION, 0603
Hardware: For Demo Board Only
1 13 E1-E7, E10-E15 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062"THK MILL-MAX, 2501-2-00-80-00-00-07-0
2 1 J1 CONN., SHROUDED HDR, MALE, 2×6, 2mm, VERT,
STR,THT
AMPHENOL, 98414-G06-12ULF
3 1 J3 CONN., HDR, MALE, 2×4, 2mm, R/A THT MOLEX, 87760-0816
4 1 J4 CONN., HDR, FEMALE, 2×4, 2mm, R/A THT SULLINS CONNECTOR SOLUTIONS, NPPN042FJFN-RC
5 2 J5, J9 CONN., RF, BNC, RCPT JACK, 5-PIN, STR, THT, 50Ω AMPHENOL RF, 112404
6 3 JP1, JP3, JP5 CONN., HDR, MALE, 1x3, 2mm, VERT, STR, THT, NO SUBS.
ALLOWED
WURTH ELEKTRONIK, 62000311121
7 2 JP2, JP9 CONN., HDR, MALE, 1×4, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000411121
8 1 JP4 CONN., HDR., MALE, 2×3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000621121
9 3 JP6-JP8 CONN., HDR, MALE, 1×2, 2mm, STR, THT WURTH ELEKTRONIK, 62000211121
10 4 MH1-MH4 STAND-OFF, NYLON, SNAP-ON, 0.25" (6.4mm) KEYSTONE, 8831
11 7 XJP1-XJP6, XJP9 CONN., SHUNT, FEMALE, 2-POS, 2mm WURTH ELEKTRONIK, 60800213421
PARTS LIST

10
DEMO MANUAL
DC2824A-A
Rev. 0
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
VOUT SEL
DO NOT EXCEED
DYNAMIC LOAD CIRCUIT
PROTO
APPROVEDECO
-
DATE
09/16/19
REV
REVISION HISTORY
_ j
2
DESCRIPTION
5% DUTY CYCLE!
VIN SVIN
INTVCC
INTVCC
INTVCC
INTVCC
INTVCC
INTVCC
INTVCC
INTVCC
INTVCC
VOUT
VSENSE+
ALERT
SDA
SCL
SYNC
PGOOD
RUN_STBY
RUN_MSTR
RUN_MSTR
SW
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
12
` \
_|çtÉ jâ
LTC7131IY
25A MONOLITHIC SYNCHRONOUS STEP-DOWN
DC2824A
710-DC2824A_REV02
N/A
CONVERTER WITH PMBUS INTERFACE
Monday, June 14, 2021
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
12
` \
_|çtÉ jâ
LTC7131IY
25A MONOLITHIC SYNCHRONOUS STEP-DOWN
DC2824A
710-DC2824A_REV02
N/A
CONVERTER WITH PMBUS INTERFACE
Monday, June 14, 2021
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
12
` \
_|çtÉ jâ
LTC7131IY
25A MONOLITHIC SYNCHRONOUS STEP-DOWN
DC2824A
710-DC2824A_REV02
N/A
CONVERTER WITH PMBUS INTERFACE
Monday, June 14, 2021
CIN8
4.7uF
C43 OPT
CIN3 22uF
25V 1206
R7 10 1%
R30 0
C9 0.1uF
R4
6.04k
1%
C7
1uF
R1
1k 1%
E11
GND
JP7
1.8V
J8
VIN
4.5V - 20V
E3
PGOOD
C4
47pF
COUT8
100uF
1210
6.3V
COUT10
C6
OPT
R71 OPT
J9
IOUT TST
JP6
1.0V
COUT11 OPT 1210
JP5
ON
OFF
WP
1 3 2
J2
GND
R34 OPT
R68 0.01 2512
R6
0
CIN7 10uF 1210
C2
4700pF
E5
TRACK
+
COUT5
12
R29 0
C41
2.2uF
0805
+
COUT6
330uF
7343 4V
12
R3 OPT
R11 10k 0.1%
R70 OPT
E4
SYNC
R19
0
L1
215nH
FP1007R3-R22-R
1 2
R17
OPT
R9 10k
1%
JP9
25A USER DEFINED 15A
ILIM
1 3 2 4
JP1
ON
OFF
RUN_MSTR
1 3 2
C3
0.01uF
E12
SVIN
COUT9
JP4
MARGIN
HIGH NOM LOW
1 2 3 4 5 6
R33 OPT
R12 10k
1%
E2
GND
C11
4.7uF
J5
VOUT
CIN1 22uF
25V 1206
R14
OPT
R58
10k
1%
R20 10 1%
CIN10
J7
VOUT
Q15
52
4
1
3
E6
CLKOUT
COUT1
1210
6.3V
R5
OPT
+
COUT7
330uF
7343 4V
12
JP3
ON
OFF
RUN_STBY
1 3 2
R2
0
R69 OPT
R8 10k
1%
E1
PULSE IN
E13
REF
R22
0
COUT12
CIN6 10uF 1210
CIN5 22uF
25V 1206
R13
2.2 1%
C1 47pF
COUT2
OPT
1210
C8
OPT 1210
JP2
DCM
SYNC
FCM
MODE
1 3 2 4
CIN9
+
CIN2 33uF
25V
7343
12
D3
CMDSH-3
2 1
JP8
ADJ
R18 18k
0.1%
R10 10k
1%
J6
GND
U1
LTC7131IY-1
SS_EXT
A3
PGOOD
C5
PGND
G3
RT
C1
D1
ASEL
STBYB B5
PGND
F2
ALERT
E5
SDA
D5
SCL
D4
VSSSEN B4
SW E6
VCCSEN B3
MARGIN D2
CLKOUT
D6
BOOST D7
PGND
F4
PGND
G2
ITH
A1
PGND
F3
SW E7
PGFD
C6
PGND
G1
RUN_MSTR A6
PVIN H1
PGND
G4
PVIN H2
INTVCC B7
SVIN B6
CSLEW A4
ILIM A5
WP
D3
DAOUT
A2
SGND
C4
C3
SGND
MODE/SYNC A7
REF
B2
PGLIM
C2
FB
B1
PGND
F1
PGND
C7 SW F5
SW F6
SW F7
SW G5
SW G6
SW G7
SW H5
SW H6
SW H7
SW J5
SW J6
SW J7
PVIN H3
PVIN H4
PVIN J1
PVIN J2
PVIN J3
PVIN J4
R21
OPT
+
CIN4 33uF
25V
7343
12
C42
0.1uF
VIN
VSENSE+ VSENSE-
PGOOD SDA ALERT WP
FB ITH
SS DAOUT
REF
SCL
SYNC RUN_MSTR RUN_STBY
VOUT
SW
VOUT

11
DEMO MANUAL
DC2824A-A
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
SCHEMATIC DIAGRAM
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
TO DC1613A
ALL PARTS ON THIS PAGE ARE FOR DEMO BOARD ONLY, NOT NEEDED IN CUSTOMER DESIGN
3V3
3V3 3V3
SDA SCL
ALERT
SYNC RUN_MSTR RUN_STBY
PGOOD
ALERT
VOUT SW
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
22
` \
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LTC7131IY
25A MONOLITHIC SYNCHRONOUS STEP-DOWN
DC2824A
710-DC2824A_REV02
N/A
CONVERTER WITH PMBUS INTERFACE
Monday, June 14, 2021
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
22
` \
_|çtÉ jâ
LTC7131IY
25A MONOLITHIC SYNCHRONOUS STEP-DOWN
DC2824A
710-DC2824A_REV02
N/A
CONVERTER WITH PMBUS INTERFACE
Monday, June 14, 2021
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
www.analog.com
SKU NO. IC NO.
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
22
` \
_|çtÉ jâ
LTC7131IY
25A MONOLITHIC SYNCHRONOUS STEP-DOWN
DC2824A
710-DC2824A_REV02
N/A
CONVERTER WITH PMBUS INTERFACE
Monday, June 14, 2021
R27
200
R28 127
R26
OPT
E14
SDA
E15
SCL
E10
ALERT
J4 HDR
CTRL
1
ALERTB
2
SDA
3
SCL
4
AUXP
5
UNUSED
6
UNUSED
7
GND
8
D1 GREEN
21
R15
4.99k
1%
D2 RED
21
C5
0.1uF
L2
OPT
1 2
J3 HDR
CTRL 1
ALERTB 2
SDA 3
SCL 4
AUXP 5
UNUSED 6 UNUSED 7
GND 8
Q2 2N7002
3
1
2
R16
4.99k
1%
U2 24LC025-I/ST
SDA 5
VCC 8
A0
1
A1
2
A2
3
VSS
4
WP 7
SCL 6
R24
OPT
R23
OPT
J1
AUXP 1
SDA 2
GND 3
SCL 4
LGKPWR 5
ALERTB 6
GPIO_1 7
OUTEN_0 8 OUTEN_1 9
GND 10
AUXSCL 11
AUXSDA 12
E7
3V3_BIAS
Q1 Si2365EDS
3
1
2
R25
OPT
AUXP SDA SCL ALERT
AUXP EESCL EESDA

12
DEMO MANUAL
DC2824A-A
Rev. 0
 ANALOG DEVICES, INC. 2022
02/22
www.analog.com
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and
conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation
Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”)
and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to
Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and
agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted
is expressly made subject to the following additional limitations:Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board;and (ii) permit any Third
Party to access the Evaluation Board. As used herein, the term “Third Party”includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is
NOT sold to Customer;all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all
be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of
use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile
or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited
to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS
Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF
LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS”AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY
DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS
LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING
BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE
HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States
federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts
(excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits
to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

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