Analog Devices DC2881A-A User manual

1
DEMO MANUAL DC2881A-A
Rev. 0
DESCRIPTION
LTC7050/LTC3884-1
2-Phase, Dual-Output Synchronous Buck
Converter with Power System Management
Demonstration circuit 2881A-A is a 2-phase dual-output,
high efficiency, high density, synchronous buck converter
with 7V to 14V input range. Each output can supply up
to 30A maximum load current with 1V output. The demo
board features the LT C
®
3884-1controller paired with the
LTC7050 dual smart power stage to provide a 2-phase
buck converter solution. The LTC3884-1 is a dual output
poly phase step-down controller with digital power sys-
tem management. The LTC7050 is a dual monolithic smart
power stage which integrates high speed drivers with low
resistance half-bridge power switches plus comprehensive
monitoring and protection circuitry in an electrically and
thermally optimized package. Please refer to the LTC3884-1
and LTC7050 data sheet for more detailed information.
DC2881A-A powers up to default settings and produces
power based on configuration resistors (or with the
All registered trademarks and trademarks are the property of their respective owners.
BOARD PHOTO
setting in its non-volatile memory) without the need for
any serial bus communication. This allows easy evalua-
tion of the DC/DC converter. To fully explore the extensive
power system management features of the part, download
the GUI software LTpowerPlay
®
onto your PC and use
ADI’s I2C/SMBus/PMBus dongle DC1613A to connect to
the board. LTpowerPlay allows the user to reconfigure the
part on the fly and store the configuration in EEPROM, view
telemetry of voltage, current, temperature and fault status.
GUI Download
The software can be downloaded from here.
For more details and instructions of LTpowerPlay, please
refer to LTpowerPlay Quick Start Procedure.
Design files for this circuit board are available.
Figure1. Dual-Output LTC7050 + LTC3884-1/DC2881A-A Demo Circuit

2
DEMO MANUAL DC2881A-A
Rev. 0
QUICK START PROCEDURE
DC2881A-A is easy to set up to evaluate the performance
of LTC7050 and LTC3884-1. Refer to Figure2 for the
proper measurement equipment setup and follow the
procedure below.
1. With power off, connect the input power supply (7-14V)
to VIN (J1) and GND (J2).
2. Connect the 1.0V output load (Initial load:no load)
between VOUT1 (J5) and GND (J6).
3. Connect the 1.0V output load (Initial load:no load)
between VOUT2 (J3) and GND (J4).
4. Connect the DMMs to the input and outputs. Set default
jumper position:
• JP1: ON
• JP6: 1.5V
• JP7: ON
• JP9: ON
• JP19: ON
• JP20: ON
The dual outputs can be configured to run separately or
together as a single output. The dynamic load is con-
nected to channel 1 by default. It can be connected to
channel 2 by changing R196 and R197. Refer to page 1
of schematic for more details.
• SW1 RUN1: ON
• SW2 RUN2: ON
5. Turn on the input power supply and check for the
proper output voltages. VOUT1 should be 1V ±0.5%
and VOUT2 should be 1V ±0.5%.
6. Once the proper output voltages are established, adjust
the loads within the operating range and observe the
output voltage regulation, ripple voltage and other
parameters.
7. Connect the dongle and control the output voltages
from the GUI. See LTpowerPlay Quick Start Procedure
for details.
NOTE: When measuring the output or input voltage rip-
ple, do not use the long ground lead on the oscilloscope
probe. See Figure3 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.
When doing the load transient test, it is recommended
to use a function generator to generate a pulse (~3%
duty cycle with 10Hz~100Hz frequency). Then applying
this pulse to the EXT PULSE (E7) and GND (E8) turrets.
100mV/A is the ratio of the pulse voltage amplitude over
OUTPUT AND ONBOARD E-LOAD CONFIGURATION
PERFORMANCE SUMMARY
Specifications are at TA= 25°C
PARAMETER CONDITION MIN TYP MAX UNITS
Input Voltage Range 7 12 14 V
Output Voltage, VOUT1/2 VIN = 7 to 14V, IOUT1/2 = 0A to 30A 0.6 1 1.8 V
Maximum Output Current, IOUT1/2 VIN = 7 to 14V, VOUT1/2 = 0.6V to 1.8V 30 A
Typical Efficiency of VOUT1/2 VIN = 12V, VOUT1/2 = 1V, IOUT1/2 = 30A 89.5 %
Default Switching Frequency 500 kHz

3
DEMO MANUAL DC2881A-A
Rev. 0
the load current step. The maximum load current step
achievable is typically 25A. The dynamic circuit MOSFET
is off when EXT PULSE is floating or grounded. Apply
around 30mV of initial value to EXT PULSE to make the
MOSFET open before the pulse, so that the slew rate of
load current will follow the slew rate of EXT PULSE lin-
early. Refer to the table in the schematic file to optimally
route the voltage sense points during load transient test. It
is highly recommended to monitor the load voltage using
JP21, which is Kelvin connected to C227.
OUTPUT AND ONBOARD E-LOAD CONFIGURATION
Figure2. Proper Measurement Equipment Setup
Figure3. Measuring Output Voltage Ripple
+ –
VOUT GND
COUT
+
–
V
IN
IIN
POWER
SUPPLY
+
+
–
–
+
–
VOUT2
LOAD2
IOUT2
+
–
+
–
+
–
+
–
VOUT1
I
OUT1
+
–
LOAD1
dc2881a-a F02

4
DEMO MANUAL DC2881A-A
Rev. 0
Figure4. Demo Setup with PC
USB to I2C/PMBus
DONGLE DC1613A
LTC7050 DEMO BOARD
DC2881A-A
USB CABLE VIN
12-PIN (J14)
CONNECTOR DC2881A-A F04
LOAD1
VOUT1
LOAD2
VOUT2
INPUT POWER
SUPPLY
OUTPUT AND ONBOARD E-LOAD CONFIGURATION
Connecting a PC to DC2881A-A
You can use a PC to reconfigure the power management
features of LTC3884-1 such as:nominal VOUT, margin set
points, OV/UV limits, temperature fault limits, sequenc-
ing parameters, the fault log, fault responses, GPIOs
and other functionalities. The DC1613A dongle may be
plugged when VIN is present.
Efficiency measurement
Headers JP12 – JP16 are kelvin connected close to the
power stage for ideal efficiency measurement. For total
VOUT1/2 rail efficiency, including controller and SPS bias
conversion losses, use the setup shown in Figure5. Check
the following setup before measurement:
• JP 20 removed
• Bleeder resistors R85 and R200 removed
•Resistors R196 and R197 removed
To measure the efficiency of LTC7050, refer to the setup
in Figure6. In this setup, the controller, SPS, and IREF
biases are provided externally so as to not load the 12V
input. Additionally, the SPS bias power loss from the
external power source is added to the efficiency calcula-
tion as shown below.
η=
V
OUT
•I
OUT
VIN •IIN+(V
DRV •IDRV )
Optionally, FILTERED SW1 (JP12) can be used as the VOUT
measurement to obtain efficiency of just the SPS (without
inductor losses). JP12 is connected to the switching node
of channel 1 through a filter composed of R173 and C26
to obtain the average voltage at the switch node. Check
the following setup before measurement:
• JP19 and JP 20 both removed
• JP7 set to OFF
• JP9 set to OFF and JP6 removed
• Bleeder resistors R85 and R200 removed
•Resistors R196 and R197 removed
• R167 and R168 removed
•Apply a 5V power supply between turrets of E35 and
E36 for driving power. Measure the voltage and the
current for driving power loss.
•Apply a 5V power supply between turrets of E39 and
E36 for controller power.
•Apply a 1.5V power supply between turrets of E40 and
E41 for IREF voltage.

5
DEMO MANUAL DC2881A-A
Rev. 0
Figure5. Measuring Setup for DC2881 Efficiency
OUTPUT AND ONBOARD E-LOAD CONFIGURATION
I
IN
POWER
SUPPLY
+
+
–
–
+
–
I
OUT1
+
–
LOAD1
VOUT1
V
IN1
+–
+–
dc2881a-a F05

6
DEMO MANUAL DC2881A-A
Rev. 0
Figure6. Measuring Setup for LTC7050 Efficiency
OUTPUT AND ONBOARD E-LOAD CONFIGURATION
VOUT1
V
IN1
+–
+–
IIN
POWER
SUPPLY
+
+
–
–
+
–
I
OUT1
+
–
LOAD1
POWER
SUPPLY
+ –
POWER
SUPPLY
POWER
SUPPLY +
+
–
V
DRV
IDRV
+
–
+
–
dc2881a-a F06

7
DEMO MANUAL DC2881A-A
Rev. 0
Figure9. VOUT1 Load Transient Response at VIN = 12V, VOUT1 = 1V Figure10. VOUT2 Load Transient Response at VIN = 12V, VOUT2 = 1V
Figure7. DC2881 Efficiency vs. Load Current on VOUT1/2
DC2881 VOUT1/2 Efficiency vs Load at
VIN = 12V, fS= 500kHz, 1-Phase
Figure8. LTC7050 Efficiency vs. Load Current on VOUT1/2
LTC7050 VOUT1/2 Efficiency vs Load at
VIN = 12V, fS= 500kHz, 1-Phase
V
OUT
= 1V
V
OUT
= 1.8V
LOAD CURRENT (A)
0
3
6
9
12
15
18
21
24
27
30
70
75
80
85
90
95
100
EFFICIENCY (%)
dc2881a-a F07
L: PA2607.211NL
215nH, 0.29mΩ
L: PA2607.211NL
215nH, 0.29mΩ
V
OUT
= 1V
V
OUT
= 1.8V
LOAD CURRENT (A)
0
3
6
9
12
15
18
21
24
27
30
70
75
80
85
90
95
100
EFFICIENCY (%)
dc2881a-a F08
100µs/DIV
dc2881a-a F10
V
OUT2
(20MHz BW)
20mV/DIV
I
OUT2
0A TO 7.5A, 7.5A/µs
5A/DIV
100µs/DIV
dc2881a-a F09
V
OUT1
(20MHz BW)
20mV/DIV
I
OUT1
0A TO 7.5A, 7.5A/µs
5A/DIV
OUTPUT AND ONBOARD E-LOAD CONFIGURATION

8
DEMO MANUAL DC2881A-A
Rev. 0
Figure11. VOUT1 Voltage Ripple = 17.4mV at
VIN = 12V, VOUT1 = 1V, IOUT1 = 30A
Figure12. VOUT2 Voltage Ripple = 17.4mV at
VIN = 12V, VOUT2 = 1V, IOUT2 = 30A
Figure13. Thermal at VIN = 12V, VOUT1 = 1V, IOUT1 = 30A, VOUT2 = 1V, IOUT2 = 30A, TA= 22°C, No Airflow
2µs/DIV
V
OUT1
(20MHz BW)
20mV/DIV
dc2881a-a F11
2µs/DIV
V
OUT2
(20MHz BW)
20mV/DIV
dc2881a-a F12
OUTPUT AND ONBOARD E-LOAD CONFIGURATION

9
DEMO MANUAL DC2881A-A
Rev. 0
LTpowerPlay SOFTWARE GUI
Figure14. LTpowerPlay Main Interface
LTpowerPlay is a powerful Windows based development
environment that supports Analog Devices power sys-
tem management ICs and µModules, including LTM4675,
LTM4676, LTM4677, LTM4678, LTM4680, LTM4700,
LTC3880, LTC3882, LTC3883, LTC3884 and LTC3888-1.
The software supports a variety of different tasks. You
can use LTpowerPlay to evaluate Analog Devices ICs by
connecting to a demo board system. LTpowerPlay can
also be used in an offline mode (with no hardware pres-
ent) 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-I2C/
SMBus/PMBus controller to communicate with one of
many potential targets, including LTM4675, LTM4676,
LTM4677, LTM4678, LTM4680, LTM4700, LTC3880,
LTC3882, LTC3883, LTC3884 and LTC3888-1’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 from here.
To access technical support documents for ADI’s
Digital Power System Management Products, visit the
LTpowerPlay Help menu.

10
DEMO MANUAL DC2881A-A
Rev. 0
The following procedure describes how to use LTpowerPlay
to monitor and change the settings of LTC3884-1.
1. Download and install the LTpowerPlay GUI from here.
2. Launch the LTpowerPlay GUI.
a. The GUI should automatically identify the DC2881A-A.
The system tree on the left hand side should look like this:
b. A green message box shows for a few seconds in the
lower left-hand corner, confirming that LTC3884-1 is
communicating:
c. In the Toolbar, click the R (RAM to PC) icon to read the
RAM from the LTC3884-1. This reads the configuration
from the RAM of LTC3884-1 and loads it into the GUI.
d. If you want to change the output voltage to a different
value, like 1.2V. In the Config tab, type in 1.2 in the
VOUT_COMMAND box, like this:
Then, click the W (PC to RAM) icon to write these reg-
ister values to the LTC3884-1. After finishing this step,
you will see the output voltage will change to 1.2V.
LTpowerPlay QUICK START PROCEDURE

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DEMO MANUAL DC2881A-A
Rev. 0
If the write is successful, you will see the following
message:
LTpowerPlay QUICK START PROCEDURE
e. You can save the changes into the NVM. In the tool bar,
click RAM to NVM button, as following
f. Save the demo board configuration to a (*.proj) file.
Click the Save icon and save the file. Name it whatever
you want.
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C1, C3, C186 CAP., 2.2µF, X5R, 25V, 10%, 0603 MURATA, GRM188R61E225KA12D
2 4 C2, C50, C217, C220 CAP., 0.1µF, X7R, 25V, 20%, 0603 AVX, 06033C104MAT2A
3 3 C4, C6, C189 CAP., 4.7µF, X5R, 10V, 10%, 0603 AVX, 0603ZD475KAT2A
4 3 C7, C205, C206 CAP., 1µF, X5R, 6.3V, 20%, 0603 AVX, 06036D105MAT2A
5 10 C8, C10, C11, C212, C213, C214,
C215, C216, C218, C219
CAP., 22µF, X7R, 16V, 20%, 1206 TAIYO YUDEN, EMK316BB7226ML-T
6 3 C12, C193, C221 CAP., 100pF, X7R, 25V, 5%, 0603 AVX, 06033C101JAT2A
7 2 C13, C222 CAP., 6800pF, X7R, 50V, 10%, 0603 MURATA, GRM188R71H682KA01D
8 2 C14, C17 CAP., 0.01µF, X7R, 25V, 10%, 0603, AEC-Q200 AVX, 06033C103K4Z2A
9 1 C15 CAP., 1µF, X5R, 16V, 10%, 0603 AVX, 0603YD105KAT2A
10 2 C31, C224 CAP., 10µF, X7R, 25V, 10%, 1210 AVX, 12103C106KAT2A
11 1 C34, C35 CAP., 4.7µF, X5R, 16V, 20%, 1210 AVX, 1210YD475MAT2A
12 2 C48, C194 CAP., 10µF, X7R, 25V, 10%, 1206 AVX, 12063C106KAT2A
13 4 C183, C187, C207, C208 CAP., 47pF, C0G, 50V, 5%, 0603 AVX, 06035A470JAT2A
14 2 C188, C190 CAP., 1µF, X7R, 25V, 10%, 0805, AEC-Q200 TDK, CGA4J3X7R1E105K125AB
15 1 C191 CAP., 5.6pF, C0G/NP0, 50V, ±0.25pF, 0603 AVX, 06035A5R6CAT2A
16 1 C209 CAP., 10µF, X5R, 16V, 10%, 0603 AVX, 0603YD106KAT2A
17 2 C225, C226 CAP., 3300pF, X7R, 50V, 10%, 0603 AVX, 06035C332KAT2A
18 2 CIN1, CIN2 CAP., 270µF, ALUM, 16V, 20%, SMD 8 × 11.9mm, E12 PANASONIC, 16SVPC270M
19 8 COUT1, COUT2, COUT5, COUT6,
COUT40, COUT41, COUT42,
COUT43
CAP., 47µF, X7R, 6.3V, 10%, 1210, AEC-Q200,
NO SUBS ALLOWED
MURATA, GCM32ER70J476KE19L
20 4 COUT3, COUT4, COUT7, COUT8 CAP., 470µF, TANT, POSCAP, 2.5V, 20%, 7343, TPF SERIES PANASONIC, ETPF470M5H
21 2 L1, L2 IND., 215nH, PWR, FERRITE, 10%, 61A, 0.29mΩ,
10.4 × 8.0mm SMD
PULSE, PA2607.211NL
22 1 L4 IND., 4.7µH, PWR, 20%, 5.9A, 40mΩ, 5.48 × 5.28mm SMD,
XAL5030, AEC-Q200
COILCRAFT, XAL5030-472MEB
23 2 Q1, Q2 XSTR., PNP, 40V, 0.2A, SOT-323, AEC-Q101 DIODES INC., MMST3906-7-F

12
DEMO MANUAL DC2881A-A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
24 2 Q7, Q8 XSTR., MOSFET, N-CH, 60V, 220mA, SOT23-3, AEC-Q101 DIODES INC., 2N7002A-13
25 1 Q9 XSTR., MOSFET, N-CH, 30V, 90A, TO-252-3 (DPAK) INFINEON, IPD90N03S4L-02
26 1 R1 RES., 0.001Ω, 1%, 1W, 2512, METAL, SENSE, AEC-Q200 VISHAY, WSL25121L000FEA
27 2 R2, R183 RES., 1Ω, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1R00TRF
28 17 R3, R4, R5, R16, R167, R171,
R172, R177, R179, R184, R186,
R190, R191, R194, R195, R222,
R223
RES., 0Ω, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA
29 12 R6, R8, R10, R29, R30, R34,
R181, R182, R185, R187, R192,
R193
RES., 10k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF1002V
30 1 R9 RES., 4.99k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF4991V
31 3 R11, R12, R13 RES., 1k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06031K00FKEA
32 1 R82 RES., 10Ω, 1%, 1/10W, 0603 VISHAY, CRCW060310R0FKEA
33 1 R83 RES., 1.24M, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06031M24FKEA
34 1 R84 RES., 402Ω, 1%, 1/4W, 1206, AEC-Q200 VISHAY, CRCW1206402RFKEA
35 2 R85, R200 RES., 27.4Ω, 1%, 1W, 2512, AEC-Q200 PANASONIC, ERJ1TNF27R4U
36 1 R160 RES., 2Ω, 1%, 1/10W, 0603 VISHAY, CRCW06032R00FNEA
37 2 R161, R170 RES., 43.2k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF4322V
38 1 R162 RES., 60.4k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060360K4FKEA
39 1 R164 RES., 200k, 1%, 1/10W, 0603 NIC, NRC06F2003TRF
40 1 R166 RES., 84.5k, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F8452TRF
41 1 R168 RES., 1Ω, 5%, 1/4W, 1206, AEC-Q200 PANASONIC, ERJ8GEYJ1R0V
42 3 R169, R208, R209 RES., 619k, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F6193TRF
43 1 R206 RES., 0Ω, 1/8W, 0805 VISHAY, CRCW08050000Z0EA
44 1 R207 RES., 931k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF9313V
45 2 R224, R225 RES., 150Ω, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF1500V
46 1 U1 IC, STEP-DOWN POWER CONTROLLER, GQFN-48 ANALOG DEVICES INC.,
LTC3884IRHE-1#PBF
47 1 U2 IC, DUAL MONOLITHIC DRIVER AND HALF BRIDGE,
LQFN-42
ANALOG DEVICES INC.,
LTC7050AV#PBF
48 1 U8 40V, 1A, 100µA IQSYNCHRONOUS STEP-DOWN
CONVERTER, MSE-16
ANALOG DEVICES INC.,
LTC3646EMSE-1#PBF
49 1 U9 IC, 3µA IQ, 20mA, 45V LOW, DROP OUT LINEAR
REGULATOR, SOT-8
ANALOG DEVICES INC.,
LT3008ETS8#PBF

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DEMO MANUAL DC2881A-A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
1 0 C5, C9, C16, C26, C192, C210,
C211, COUT26, COUT37
CAP., OPTION, 0603
2 2 C27, C28 CAP., 0.01µF, X7R, 25V, 10%, 0603, AEC-Q200 AVX, 06033C103K4Z2A
3 2 C34, C35 CAP., 4.7µF, X5R, 16V, 20%, 1210 AVX, 1210YD475MAT2A
4 2 C39, C50 CAP., 0.1µF, X7R, 25V, 20%, 0603 AVX, 06033C104MAT2A
5 2 C40, C42 CAP., 10pF, X7R, 10V, 10%, 0603 AVX, 0603ZC100KAT2A
6 1 C41 CAP., 1µF, X5R, 16V, 10%, 0603 AVX, 0603YD105KAT2A
7 0 COUT22, COUT36 CAP., OPTION, 7343
8 2 COUT23, COUT35 CAP., 470µF, TANT, POSCAP, 2.5V, 20%, 7343, TPF Series PANASONIC, ETPF470M5H
9 4 COUT24, COUT25, COUT38,
COUT39
CAP., 100µF, X5R, 6.3V, 20%, 1210 AVX, 12106D107MAT2A
10 1 C227 CAP., 22µF, X7R, 16V, 20%, 1210, AEC-Q200 MURATA, GCM32ER71C226ME19L
11 0 D6, D7 DIODE, OPTION, SOD-323
12 2 D3, D4 LED, GREEN, WATER CLEAR, 0603 WURTH ELEKTRONIK, 150060GS75000
13 3 D5, D10, D11 LED, RED, WATER CLEAR, 0603 WURTH ELEKTRONIK, 150060RS75000
14 1 D8 DIODE, SCHOTTKY, 20V, 0.5A, SOD-882, LEADLESS NEXPERIA, PMEG2005AEL, 315
15 0 D9 DIODE, OPTION, SCHOTTKY, POWERDI 123
16 0 R14, R20, R22, R23, R25, R26,
R27, R28, R31, R32, R35, R36,
R37, R38, R39, R40, R42, R43,
R45, R46, R113, R114, R120,
R121, R122, R126, R133, R136,
R138, R142, R145, R151, R156,
R173, R178, R180, R198, R199,
R201, R202, R203, R204, R214,
R215, R216, R217, R218, R219,
R220
RES., OPTION, 0603
17 3 R69, R70, R82 RES., 10Ω, 1%, 1/10W, 0603 VISHAY, CRCW060310R0FKEA
18 0 R41, R44, R47, R48, R196 RES., OPTION, 2010
19 6 R59, R127, R137, R147, R205,
R221
RES., 0Ω, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA
20 1 R60 RES., 5k, 10%, 1/2W, THT 3/8" SQ, 1-TURN, TOP ADJ.,
TRIMPOT
BOURNS, 3386P-1-502LF
21 1 R61 RES., 154k, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1543TRF
22 3 R62, R125, R130 RES., 20k, 1%, 1/10W, 0603 NIC, NRC06F2002TRF
23 1 R64 RES., 1M, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1004TRF
24 1 R65 RES., 681k, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F6813TRF
25 1 R66 RES., 18k, 5%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060318K0JNEA
26 2 R67, R211 RES., 2k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06032K00FKEA
27 1 R68 RES., 3.3Ω, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06033R30FKEA
28 5 R72, R79, R81, R123, R212 RES., 10k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3EKF1002V

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DEMO MANUAL DC2881A-A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
29 1 R73 RES., 0.01Ω, 1%, 1W, 2512, PWR, METAL, SENSE,
AEC-Q200
VISHAY, WSL2512R0100FEA
30 0 R88, R158 RES., OPTION, 0805
31 2 R69, R70 RES., 10Ω, 1%, 1/10W, 0603 VISHAY, CRCW060310R0FKEA
32 2 R128, R150 RES., 4.99k, 1%, 1/10W, 0603 PANASONIC, ERJ3EKF4991V
33 0 R139 RES., OPTION, 1206
34 1 R144 RES., 15.8k, 1%, 1/10W, 0603, AEC-Q200 NIC, NRC06F1582TRF
35 0 R159 RES., OPTION, 2512
36 1 R197 RES., 0Ω, JUMPER, 75A, 2010, COPPER, SENSE VISHAY, WSL201000000ZEA9
37 2 R210, R213 RES., 0Ω, 1/8W, 0805 VISHAY, CRCW08050000Z0EA
38 4 Q3, Q4, Q21, Q22 XSTR., MOSFET, P-CH, 30V, 3.3A, SOT-23-3 DIODES INC., DMP3068L-13
39 1 U3 IC, EEPROM, I2C, TSSOP-8, 2Kb (256 × 8), 400kHz MICROCHIP, 24LC024-I/ST
40 1 U5 OSC., 3.81Hz to 1MHz, 5pF, 90ppm, TSOT23-6 ANALOG DEVICES INC.,
LTC6992IS6-1#PBF
41 1 U6 IC, SINGLE R to R IN/OUT OP AMP, TSOT23-5,
100V/µs, 85MHz
ANALOG DEVICES INC.,
LT1803IS5#PBF
Hardware: For Demo Board Only
1 25 E1, E2, E3, E4, E5, E6, E7, E8,
E10, E11, E12, E13, E14, E16,
E19, E20, E33, E34, E35, E36,
E37, E38, E39, E40, E41
TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THK MILL-MAX, 2501-2-00-80-00-00-07-0
2 6 J1, J2, J3, J4, J5, J6 EVAL BOARD STUD HARDWARE SET, #10-32 ANALOG DEVICES INC., 720-0010
3 3 J7, J8, J9 CONN., RF, BNC, RCPT, JACK, 5-PIN, ST, THT, 50Ω AMPHENOL RF, 112404
4 1 J13 CONN., HDR, FEMALE, 2 × 7, 2mm, R/A THT SULLINS CONNECTOR SOLUTIONS,
NPPN072FJFN-RC
5 1 J14 CONN., HDR, SHROUDED, MALE, 2 ×6, 2mm, VERT, ST, THT AMPHENOL, 98414-G06-12ULF
6 1 J15 CONN., HDR, MALE, 2 × 7, 2mm, R/A THT MOLEX, 0877601416
7 1 J16 CONN., HDR, SHROUDED, MALE, 1 ×4, 2mm, VERT, ST, THT HIROSE ELECTRIC, DF3A-4P-2DSA
8 1 J25 CONN., HDR, MALE, 2 × 6, 2.54mm, VERT, ST, THT, 30u" Au SAMTEC, TSW-106-07-S-D
9 3 JP1, JP7, JP9 CONN., HDR, MALE, 1 × 3, 2.54mm, VERT, ST, THT SAMTEC, TSW-103-07-L-S
10 1 JP6 CONN., HDR, MALE, 2 × 3, 2.54mm, VERT, ST, THT SAMTEC, TSW-103-07-L-D
11 8 JP12, JP13, JP14, JP15, JP16,
JP19, JP20, JP21
CONN., HDR, MALE, 1 × 2, 2.54mm, VERT, ST, THT WURTH ELEKTRONIK, 61300211121
12 2 JP17, JP18 CONN., HEADER, HDR, 2 POS, 2.54mm, ST THT SAMTEC, TSW-102-06-L-S
13 4 MP25, MP26, MP27, MP28 STANDOFF, NYLON, SNAP-ON, 0.625 (5/8"), 15.9mm KEYSTONE, 8834
14 2 SW1, SW2 SWITCH, SLIDE, DPDT, 0.3A, 6VDC, PTH C&K, JS202011CQN
15 6 XJP1, XJP6, XJP7, XJP9, XJP19,
XJP20
CONN., SHUNT, FEMALE, 2 POS, 2.54mm SAMTEC, SNT-100-BK-G

15
DEMO MANUAL DC2881A-A
Rev. 0
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
NOTES:
1. L1 and L2 planes can accommodate FP0707R1-R110-R.
STUFF FOR TWO-PHASE SINGLE OUTPUT CONFIGURATION
REV DESCRIPTION APPROVED DATEECO
REVISION HISTORY
12-20-21YTPRODUCT ION3
KELVIN CONNECT R3 AND R4 TO R1 AND R159
PLACE R173 AS CLOSE TO L1 AS POSSIBLE
+
-
-
+
KELVIN CONNECT JP13 TO C220
VIN2 EFF
-
KELVIN CONNECT JP15 TO L2 VIA NEAR CENTER OF L2
+
VOUT2 EFF
-
KELVIN CONNECT JP12 TO C26
+
FILTERED SW 1 VOUT1 EFF
KELVIN CONNECT JP16 TO C217
KELVIN CONNECT JP14 TO L1 VIA NEAR CENTER OF L1
-
VIN1 EFF
+ + -
U2
- A
*
VERSION
LTC7050
- B LTC7050-1 - C LTC7050P
7V-14V
1V/30A 1V/30A
IMON1
IREF
IREF IMON2
# of Outputs
TABLE TO DETERMINE IDEAL Vsense LINES
# of Phases per Output
Load Step on R194, R195 R5, R16 R40, R219 R43, R220
2 2 2 1
1 1 1 2
None
VOUT1 VOUT2
Any
0 Ohms
OPT
0 Ohms
OPT
0 Ohms 0 Ohms 0 Ohms
0 Ohms 0 Ohms0 Ohms
OPT OPT
OPT OPT
OPT OPT
Remove these jumpers for efficiency measurement
At COUT42 At COUT40
At C227
At C227
BLEEDER LOADS
Remove these resistors for efficiency measurement
KELVIN CONNECT TO COUT42 KELVIN CONNECT TO COUT40
KELVIN CONNECT TO C227
VOUT RMT
- +
VIN
VDD25
EXTVCC
INTVCC1
VDD25
VDD33
VIN
VIN1
VIN1
VDD33
VDD33
VDD33
VDD33 VDD33
VDD33
VOUT1 VOUT2
VIN1
GND_POWER
VOUT2
VCC
VCC
IREF
VDR
VOUT1
VCC
VCC
FILTERED_SW1
IREF
GND_POWER
VIN1
GND_POWER
VOUT2
VIN1
GND_POWER
FILTERED_SW1
GND_POWER
VOUT1
VIN1
GND_POWER
SGND1
SGND1
SGND1
SGND1
SGND1
SGND1
SGND1
SGND1
TMON
VIN VIN2
STEP_LED
VOUT1 VOUT2
VDD33
VOUT1
VOUT2
VLOAD
SHARE_CLK
SYNC
ALERTB
RUN1
FAULT1
SCL SDA
PGOOD1 PGOOD2
FAULT2
ITH_R2 ITH_R1 FAULT2 FAULT1
ITH2 ITH1
RUN2 RUN1
RUN2
PW M0
VSENSE2+
SW2
ISNS2+ ISNS2-
VSENSE2-
VSENSE1+
SW1
ISNS1+ ISNS1-
VSENSE1-
FLTB2
FLTB1
EN2
EN1
PGOOD2 PGOOD1
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.
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 APPL ICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
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DEVICES
AHEAD OF WHAT'S POSSIBLE
TM
SANTA CLARA, CA 95054
1 3
LT YT
LTC7050X / LTC3884RHE-1
HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER WITH PSM
DC2881A(A,B,C)
710-DC2881A(A,B,C)_REV03
N/A
Monday, December 20, 2021DATE:
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.
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 APPL ICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
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AHEAD OF WHAT'S POSSIBLE
TM
SANTA CLARA, CA 95054
1 3
LT YT
LTC7050X / LTC3884RHE-1
HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER WITH PSM
DC2881A(A,B,C)
710-DC2881A(A,B,C)_REV03
N/A
Monday, December 20, 2021DATE:
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.
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 APPL ICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
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AHEAD OF WHAT'S POSSIBLE
TM
SANTA CLARA, CA 95054
1 3
LT YT
LTC7050X / LTC3884RHE-1
HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER WITH PSM
DC2881A(A,B,C)
710-DC2881A(A,B,C)_REV03
N/A
Monday, December 20, 2021
C11 22uF 1206
J5 VOUT1
U2
LTC7050AV
PGND
19
SW1 5
TDIO
36
SW1 4
PGND
39 PGND
40
SW1 1
PGND
18
PGND
17
PGND
41
VIN 21
VIN
37
VIN 20
ISNS1
33
PWM1
35
SW1 2
FLTB1
34
VIN
38
SW1 42
VIN
43
SW1 6
PGND
7PGND
8PGND
9
SW2 10 SW2 11 SW2 12 SW2 13 SW2 14 SW2 15 SW2 16
RUN1
32
SGND
31
VCC
30
PVCC
29 PVCC 28
PGND
27
RUN2
26
ISNS2
25
FLTB2
24
PWM2 23
TMON 22
SW1 3
R161 43.2k
R47 OPT
2010
R2 1
1%
+
COUT7 470uF
7343 2.5V
+
COUT4 470uF
7343 2.5V
J1
VIN
R85 27.4 2512
E2
VIN-
C207 47pF
JP16
1 2
R198 OPT
R45 OPT
C219 22uF 1206
C1 2.2uF
COUT6 47uF 1210
R214 OPT
R114 OPT
JP20
VDR
STEP_LED
EN STEP
1 2
COUT40 47uF 1210
R186 0
C222 6800pF
C206 1uF
C7 1uF
C12 100pF
R25 OPT R31 OPT
R199 OPT
R34 10K
JP19
VIN
VIN2
EN AUX
1 2
R172 0
C6 4.7uF
R23 OPT
R46 OPT
R195 0
+
CIN2
270uF
16V
R179 0
R191 0
COUT26
OPT
R171 0
C225 3300pF
J8
VOUT1
C209 10uF 16V
R178 OPT
R223 0
C187 47pF
+
CIN1
270uF
16V
J6
GND
R28 OPT
JP1
ON
OFF
WP
1 3 2
R9 4.99k
R203 OPT
R159 OPT 2512
JP13
1 2
C17 0.01uF
R42 OPT
C213 22uF 1206
R10 10K
R35 OPT
C210 OPT
C26 OPT
R8 10K
R200 27.4 2512
R11 1k
COUT1 47uF 1210
C215 22uF 1206
C14 0.01uF
R173 OPT
R14 OPT
R225 150
COUT43 47uF 1210
C5
OPT
+
COUT3 470uF
7343 2.5V
R177 0
R5 0
C10 22uF 1206
C183 47pF
C220 0.1uF
R204 OPT
Q2
MMST3906-7-F
3 2
1
C217 0.1uF
R180 OPT
R38 OPT
R202 OPT C15 1uF 16V R185 10K
JP14
1 2
R12
1k
J2
GND
Q1
MMST3906-7-F
3 2
1
L1 215nH
PA2607.211NL
R27 OPT
C218 22uF 1206
C208 47pF
E4
VOUT2-
COUT5 47uF 1210
R32 OPT
+
COUT8 470uF
7343 2.5V
R39 OPT
R184 0
R222 0
R30 10K
C4 4.7uF
R194 0
C16 OPT
R20 OPT
E38
PW M2
C211 OPT
R40 OPT
E5
VOUT1+
J3 VOUT2
E37
PW M1
R182 10K
R44 OPT
2010
C205 1uF
R219 OPT
R193 10K
R43 OPT
J4
GND
R41 OPT
2010
C9 OPT
R22 OPT
E3
VOUT2+
R183 1
C13 6800pF
R29 10K
JP15
1 2
R170 43.2k
R37 OPT
R181 10K
U1
LTC3884-RHE-1
PW M0 45
NC 46
VCC0 44
IIN- 48
PGND
42
VCC1 37
NC 35
ITH_R0
6
SYNC
12
SCL
13
SDA
14
ALERTB
15
SHARE_CLK
28
RUN0
18
RUN1
19
ITH_R1
31
ITH1
30
TSNS0
11
TSNS1
10
ASEL0
20
ASEL1
21
VDD33 29
ITH0
7
WP
27
VDD25 26
IIN+ 47
FAULT0 16 FAULT1 17
NC 43
ISENSE0+ 8
VOUT1_CFG
23 VSENSE0- 3
VSENSE0+ 2
ISENSE0- 9
VSENSE1+ 33
ISENSE1- 5
ISENSE1+ 4
NC 38
VOUT0_CFG
22
VSENSE1- 32
GND
49
FREQ_CFG
24
PHASE_CFG
25
PGOOD1
34
PGOOD0
1
PW M1 36
INTVCC 39
VIN 40
EXTVCC
41
GND
50
GND
51
GND
52
GND
53
C212 22uF 1206
JP18
1 2
JP21
1 2
R48 OPT
2010
L2 215nH
PA2607.211NL
R3
0
R156 OPT
R26 OPT
JP12
1 2
R113
OPT
C214 22uF 1206
R13 1k
R4 0
R1 0.001 2512
COUT37
OPT
J9
VOUT2
R190 0
R201 OPT
R16 0 R220 OPT
COUT42 47uF 1210
R6 10K
COUT2 47uF 1210
C226 3300pF
R187 10K
C8 22uF 1206
R224 150
C221 100pF
JP17
1 2
E6
VOUT1-
E1
VIN+
COUT41 47uF 1210
C3 2.2uF
R36 OPT
C216 22uF 1206
R192 10K
ASEL0 ASEL1
VOUT0_CFG VOUT1_CFG
SCL
SDA
FREQ_CFG
ALERTB
PHASE_CFG
W P1
SHARE_CLK
SYNC
RUN1
ITH_R2
ITH2
VSENSE2+ VSENSE2- VSENSE1+ VSENSE1-
RUN2
ITH_R1
ITH1 TSNS0
PW M1
SW2
EN2
RUN2
RUN1
SW1 EN1
PW M0 TSNS0
ISNS2+ ISNS2-
ISNS1- ISNS1+

16
DEMO MANUAL DC2881A-A
Rev. 0
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
IREF
1.5V
1.2V
1.8V
DYNAMIC LOAD CIRCUIT
5V BIAS
KELVIN CONNECT J7 TO R73
70Hz, 3% Duty Cycle
Stuffing options for dynamic load circuit: 1)External Pulse:stuff R213,R210,R59=0, R67=2k; DNP:R88,R158 2)On Board Pulse:stuff R88,R158=0, R67=301, R59= 2.3k; DNP:R210
VOUT1 VOUT2
VIN2 SVIN
IREF
SVIN
INTVCC
VIN2
VDR
EXTVCC
VON
VON
STEP_LED
STEP_LED
VLOAD
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.
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.
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2 3
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LTC7050X / LTC3884RHE-1
HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER WITH PSM
DC2881A(A,B,C)
710-DC2881A(A,B,C)_REV03
N/A
Monday, December 20, 2021
<Variant Name>
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.
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.
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TM
SANTA CLARA, CA 95054
2 3
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LTC7050X / LTC3884RHE-1
HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER WITH PSM
DC2881A(A,B,C)
710-DC2881A(A,B,C)_REV03
N/A
Monday, December 20, 2021
<Variant Name>
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.
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.
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2 3
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LTC7050X / LTC3884RHE-1
HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER WITH PSM
DC2881A(A,B,C)
710-DC2881A(A,B,C)_REV03
N/A
Monday, December 20, 2021
<Variant Name>
C48
10uF
25V
1206
R60 5k
1 3
2
U9
LT3008ETS8
IN
5
2
GND
SHDN
1
OUT 6
ADJ 7
3
GND
4
GND
NC 8
C227 22uF 16V 1210
C186 2.2uF
U8
LTC3646-MSE-1
BOOST 12
VFB 2
VON 5
PGOOD
6
SW 11
SVIN 16
EXTVCC 14
ITH
3
PVIN 10
RT
4
INTVCC 13
MODE/SYNC
7
RUN
15
SGND
1
PGND
17
NC 8
PVIN 9
JP9
ON
OFF
IREF
1 3 2
E8 GND
C223 4.7uF 16V 1210
COUT39
100uF
1210 6.3V
J7
IOUT STEP
R213 0
0805
Q9
IPD90N03S4L-02
2
1
3
C39
0.1uF
C34 4.7uF
16V
1210
C188
1uF
0805
C194
10uF
25V
1206
R211 2k 1%
R64 1M
E35
BIAS
R59
0
R166 84.5k
R72 10K
R169 619k 1%
R65 681k
1%
COUT24
100uF
1210 6.3V
R196 OPT
2010
R84 402 1206 1%
E40
IREF
C192 OPT
R210 0
0805
+
COUT23
470uF
7343 2.5V
R83 1.24M 1%
E7 EXT PULSE
R221 0
D9
OPT DFLS1200
C31 10uF 25V 1210
R162 60.4k
U6
LT1803IS5
VOUT 1
V-
2
+IN
3
-IN
4
V+
5
C189 4.7uF
COUT38
100uF
1210 6.3V
R206 0
0805
C2 0.1uF
C191 5.6pF
C40 10pF
L4 4.7uH
XAL5030-472MEB
R160
2
R68 3.3
1%
C35
4.7uF 16V
1210
C190
1uF
0805
R197 0
2010
+
COUT35
470uF
7343 2.5V
+
COUT36
OPT
7343 2.5V
R62 20k
R208 619k 1%
+
COUT22
OPT
7343 2.5V
E39
EXTVCC
R66 18k
E36
GND
COUT25
100uF
1210 6.3V
R88
OPT0805
C224 10uF 25V 1210
R82 10 1%
R158 OPT
0805
JP7
ON
OFF
BIAS
1 3 2
JP6
REFIN
12
34
56
R167
0
R61
154k
R207 931K 1%
C41 1uF
C42
10pF
C193
100pF
R73 0.01
2512
R67
2k 1%
R168 11206
R209 619k
R164 200k
U5
3.81Hz to 1MHz
LTC6992IS6-1#PBF
MOD
1
GND
2
SET
3DIV 4
V+ 5
OUT 6

17
DEMO MANUAL DC2881A-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
PGOOD1 PGOOD2
TO DC2086A
ON OFF
ON
OFF
RUN2
RUN1TO DC1613A
ALL PARTS ON THIS PAGE ARE FOR DEMO BOARD ONLY, NOT NEEDED IN CUSTOMER DESIGN
1206
ALERTB
HARDWARE
FAULT1 FAULT2
STEP_LEDSTEP_LED
VDD33
3V3
VIN
3V3
VIN
3V3
VDD33
STEP_LEDSTEP_LED STEP_LED
TMON
PGOOD2
PGOOD1
ALERTB SDA SCL
RUN2
RUN1
FAULT1
FAULT2
SYNCSHARE_CLK
FAULT1 FAULT2 ALERTB
EN1 EN2 FLTB2 FLTB1
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.
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.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE
TM
SANTA CLARA, CA 95054
3 3
LT Y.T
LTC7050X / LTC3884RHE-1
HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER WITH PSM
DC2881A(A,B,C)
710-DC2881A(A,B,C)_REV03
N/A
Monday, December 20, 2021
<Variant Name>
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.
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.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE
TM
SANTA CLARA, CA 95054
3 3
LT Y.T
LTC7050X / LTC3884RHE-1
HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER WITH PSM
DC2881A(A,B,C)
710-DC2881A(A,B,C)_REV03
N/A
Monday, December 20, 2021
<Variant Name>
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.
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.
2555 AUGUSTINE DRIVE
www.analog.com
ANALOG
DEVICES
AHEAD OF WHAT'S POSSIBLE
TM
SANTA CLARA, CA 95054
3 3
LT Y.T
LTC7050X / LTC3884RHE-1
HIGH EFFICIENCY SYNCHRONOUS BUCK CONVERTER WITH PSM
DC2881A(A,B,C)
710-DC2881A(A,B,C)_REV03
N/A
Monday, December 20, 2021
<Variant Name>
Q8 2N7002A
3
1
2
R137 0
E16
GND
D5
RED
E11
SDA
R133 OPT
E41
GND
J25
HDR
1 3 56
4 2
78 910 1112
E13
SHARE_CLK
R127
0
SW2
1
2
3
4
5
6
R147 0
R150 4.99k
Q22
DMP3068L
3
1
2
R217 OPT R218 OPT
MP25 STANDOFF,NYLON,SNAP-ON,0.625 (5/8"),15.9mm
R123 10K
J13 HDR
1
FAULTB 2
CTRL 3
ALERTB 4
SDA 5
SHARE_CLK 6
SCL 7
RESETB 8
AUXP 9
UNUSED 10 UNUSED 11
GND 12 GND 13
12V 14 12V
R120 OPT
R122 OPT
R79 10K
MP28 STANDOFF,NYLON,SNAP-ON,0.625 (5/8"),15.9mm
Q21
DMP3068L
3
1
2
R145 OPT
D4 GREEN
J16
AUX3V4 4
SCL 3
GND 2
SDA 1
PCB1 PCB, DC2881A REV03
R142 OPT
E33
FLTB1
R212 10K
U3
24LC024-I/ST
A0 1 A1 2 A2 3
VSS
4
SDA 5
SCL 6
WP 7
VCC 8
D8
PMEG2005AEL
21
LB1 LABEL
E14
SYNC
R139 OPT
Q7 2N7002A
3
1
2
R136 OPT
E12
SCL
MP26 STANDOFF,NYLON,SNAP-ON,0.625 (5/8"),15.9mm
C28 0.01uF
J14
AUXP 1
SDA 2
GND 3
SCL 4
LGKPW R 5
ALERTB 6
GPIO_1 7
OUTEN_0 8 OUTEN_1 9
GND 10
AUXSCL 11
AUXSDA 12
R128 4.99k
R70 10
R69 10
E20
RUN1
R126 OPT
R81 10K
E19
RUN2
STNCL1 TOOL, STENCIL, 700-DC2881A REV03
D10
RED
21
E10
ALERTB
D7 OPT
J15 HDR
1FAULTB 2CTRL 3ALERTB 4SDA 5SHARE_CLK 6SCL 7RESETB 8AUXP 9UNUSED
10 UNUSED 11 GND 12 GND 13 12V 14 12V
R205
0
C50 0.1uF
C27 0.01uF
R121 OPT
R130 20k
R215 OPT
D11
RED
21
R151 OPT
R125 20k
Q3
DMP3068L
3
1
2
R144 15.8k
E34
FLTB2
D3 GREEN
MP27 STANDOFF,NYLON,SNAP-ON,0.625 (5/8"),15.9mm
D6 OPT
R216 OPT
Q4
DMP3068L
3
1
2
R138 OPT
SW1
1
2
3
4
5
6
AUXVCC
EEWP
EESDA
AUX3V4
AUXVCC
EESCL
FLTB2
AUXVCC FAULT2 FAULT1
FLTB1

18
DEMO MANUAL DC2881A-A
Rev. 0
 ANALOG DEVICES, INC. 2022
07/22
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.
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