Linear Technology DC2087A Quick setup guide

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DC2087A
ANALOG DEVICES
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DEMO MANUAL DC2087A
DESCRIPTION
LTM4676EY
26A Step-Down µModule Regulator with
PMBus Power System Management
Demonstration circuit 2087A is a single-output, high ef-
ficiency,highdensity, µModule
®
regulator with 4.5V to 16V
input range. It can supply 26A maximum load current. The
demo board has a LT M
®
4676 µModule regulator, which is
a dual 13A or single 26A step-down regulator with PMBus
power system management. Please see LTM4676 data
sheet for more detailed information.
DC2087Apowersuptodefaultsettings and produces power
based on configuration resistors without the need for any
serial bus communication. This allows easy evaluation 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 LT C ’s
I2C/SMBus/PMBus dongle DC1613A to connect to the
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks
and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
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:
http://www.linear.com/ltpowerplay
For more details and instructions of LTpowerPlay, please
refer to LTpowerPlay GUI for LTM4676 Quick Start Guide.
Design files for this circuit board are available at
http://www.linear.com/demo
BOARD PHOTO
Figure 1. Single-Output LTM4676/DC2087A Demo Circuit

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DEMO MANUAL DC2087A
QUICK START PROCEDURE
PERFORMANCE SUMMARY
Specifications are at TA= 25°C
PARAMETER CONDITION VALUE
Input Voltage Range 4.5V to 16V
Output Voltage, VOUT VIN = 4.5 to 16V, IOUT = 0A to 26A 0.5V to 4V, Default: 1V
Maximum Output Current, IOUT VIN = 4.5 to 16V, VOUT = 0.5V to 4V 26A
Typical Efficiency VIN = 12V, VOUT = 1.2V, IOUT = 26A 83.2%
Default Switching Frequency 350kHz
Table 1. LTM4676 Demo Cards for Up to 100A Point-of-Load Regulation
MAXIMUM OUTPUT CURRENT NUMBER OF OUPUT VOLTAGES
NUMBER OF LTM4676 µMODULE
REGULATORS ON THE BOARD DEMO BOARD NUMBER
13A, 13A 2 1 DC1811A
26A 1 1 DC2087A
50A 1 2 DC1989A-A
75A 1 3 DC1989A-B
100A 1 4 DC1989A-C
100A 1 1(+3 ×LTM4620A) DC2106A-A
130A 1 1(+3 ×LTM4630) DC2106A-B
Demonstration circuit 2087A is easy to set up to evaluate
the performance of the LTM4676EY. Refer to Figure 2 for
the proper measurement equipment setup and follow the
procedure below.
1. With power off, connect the input power supply to VIN
(4.5V–16V) and GND (input return).
2. Connect the 1.0V output load between VOUT and GND
(Initial load: no load).
3. Connect the DVMs to the input and outputs. Set default
jumper position: JP1: ON.
4. Turn on the input power supply and check for the proper
output voltages. VOUT should be 1.0V ±1 %.
5. Once the proper output voltages are established, ad-
just the loads within the operating range and observe
the output voltage regulation, ripple voltage and other
parameters.
6. Connect the dongle and control the output voltages
from the GUI. See LTpowerPlay GUI for the LTM4676
Quick Start Guide for details.
Note: When measuring the output or input voltage ripple,
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.
Connecting a PC to DC2087A
You can use a PC to reconfigure the power management
features of the LTM4676 such as: nominal VOUT, margin
setpoints, OV/UV limits, temperature faultlimits, sequenc-
ing parameters, the fault log, fault responses, GPIOs and
other functionality. The DC1613A dongle may be plugged
when VIN is present.

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DEMO MANUAL DC2087A
QUICK START PROCEDURE
Figure 2. Proper Measurement Equipment Setup
Figure 3. Proper Measurement Equipment Setup

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DEMO MANUAL DC2087A
QUICK START PROCEDURE
Figure 4. Demo setup with PC
LOAD CURRENT (A)
0
EFFICIENCY (%)
90
95
100
16
85
80
75 2468 10 12 14 20 2218 24 26
VOUT = 0.9V, 350kHz
VOUT = 1.0V, 350kHz
VOUT = 1.2V, 350kHz
VOUT = 1.5V, 350kHz
VOUT = 1.8V, 425kHz
VOUT = 2.5V, 500kHz
VOUT = 3.3V, 500kHz
LOAD CURRENT (A)
0
EFFICIENCY (%)
85
90
95
16
80
75
70 2468 10 12 14 20 2218 24 26
VOUT = 0.9V, 350kHz
VOUT = 1.0V, 350kHz
VOUT = 1.2V, 350kHz
VOUT = 1.5V, 350kHz
VOUT = 1.8V, 425kHz
VOUT = 2.5V, 500kHz
VOUT = 3.3V, 500kHz
VOUT
(20MHz BW)
20mV/DIV
13A TO 26A
LOAD STEP
VIN = 12V
VOUT = 1V
fSW = 350kHz
VOUT RANGE = 0
VOUT
(20MHz BW)
10mV/DIV
VIN = 12V
VOUT = 1V VIN = 12V
VOUT = 1V
IOUT = 26A
fSW = 350kHz
TA= 23°C
NO AIRFLOW
Figure 5. Efficiency vs Load Current at VIN = 5V Figure 6. Efficiency vs Load Current at VIN = 12V
Figure 7. Output Voltage VOUT
vs Load Current
Figure 8. Output Voltage Ripple
Figure 9. Thermal Performance

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DEMO MANUAL DC2087A
LTpowerPlay SOFTWARE GUI
LTpowerPlay is a powerful Windows-based development
environment that supports Linear Technology power sys-
tem management ICs, including the LTM4676, LT C
®
3880,
LTC3883, LTC2974 and LTC2978. The software supports
a variety of different tasks. You can use LTpowerPlay to
evaluate Linear Technology ICs by connecting to a demo
board system. LTpowerPlay can also be used in an offline
mode (with no hardware present) in order to build a mul-
tichip configuration file that can be saved and reloaded at a
latertime. LTpowerPlay provides unprecedented diagnostic
and debug features. It becomes a valuable diagnostic tool
during board bring-up to program or tweak the power
management scheme in a system, or to diagnose power
issues when bringing up rails. LTpowerPlay utilizes the
DC1613A USB-to-SMBus controller to communicate with
one of many potential targets, including the LTM4676, the
LTC3880 and the LTC3883’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
soft-ware can be downloaded from:
http://www.linear.com/ltpowerplay
To access technical support documents for LT C Digital
Power Products visit Help. View online help on the
LTpowerPlay menu.
Figure 10. LTpowerPlay Main Interface

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DEMO MANUAL DC2087A
LTpowerPlay QUICK START PROCEDURE
Thefollowingprocedure describes how to use LTpowerPlay
to monitor and change the settings of LTM4676.
1. Download and install the LTPowerPlay GUI:
http://www.linear.com/ltpowerplay
2. Launch the LTpowerPlay GUI.
a. TheGUI should automatically identify the DC2087A. 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 LTM4676 is
communicating:
c. In the Toolbar, click the “R” (RAM to PC) icon to read the
RAM from the LTM4676. This reads the configuration
from the RAM of LTM4676 and loads it into the GUI.
Then, click the “W” (PC to RAM) icon to write these register
values to the LTM4676. After finishing this step, you will
see the output voltage will change to 1.5V.
d. If you want to change the output voltage to a different
value, like 1.5V. In the Config tab, type in 1.5 in the
VOUT_COMMAND box, like this:
Ifthe write is successful, youwillseethefollowingmessage:
e. You can save the changes into the NVM. In the tool bar,
click “RAM to NVM” button, as following
f. Savethedemo board configuration to a (*.proj) file. Click
the Save icon and save the file. Name it whatever you
want.

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DEMO MANUAL DC2087A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 CAP., 150µF, 35V, ALUMINUM ELECTR., SUN ELECT., 35CE150AX
2 2 CIN2, CIN4, CAP., X5R, 10µF, 35V, 10%,1210 MURATA, GRM32ER6YA106KA12
3 6 COUT1-COUT3, COUT6-COUT8 CAP., X5R, 100µF, 6.3V, 20% 1210 MURATA, GRM32ER60J107ME20L
4 2 COUT4, COUT5 CAP., 330µF, 6.3V, POSCAP,D3L SANYO, 6TPF330M9L
5 1 C14 CAP., X7R, 2200pF, 25V, 10%, 0603 MURATA, GRM188R71E222KA01D
6 1 C15 CAP., X7R, 68pF, 25V, 10%, 0603 AVX., 06033A680KAT2A
7 1 C20 CAP., X5R, 0.1µF, 16V, 10%,0603 MURATA, GRM188R61C104KA01D
8 1 C21 CAP., X5R, 1µF, 25V,10%, 0603 MURATA, GRM188R61E105KA12D
9 1 JP1 HEADER 3 PIN 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S
10 2 J2, J4 CONN, BNC, 5PINS CONNEX, 112404
11 1 J1 CONN HEADER 12POS 2MM STR DL PCB FCI 98414-G06-12ULF
12 2 J9, J10 BANANA SMALL KEYSTONE, 575-4
13 2 J7, J8 STUD, TEST PIN PEM KFH-032-10
14 4 J7, J8 X2 NUT, BRASS 10-32 ANY, #10-32M/S BR PL
15 2 J7, J8 RING, LUG #10 KEYSTONE, 8205
16 2 J7, J8 WASHER, TIN PLATED BRASS ANY, #10 EXT BZ TN
17 1 Q1 MOSFET, N-CH 40V 50A TO-252 VISHAY, SUD50N04-8M8P-4GE3
18 8 R3, R5, R7, R9, R19, R25, R32, R40 RES., CHIP, 0Ω, 1%, 0603 NIC, NRC06ZOTR
19 11 R10-R15, R18, R24, R46, R47, R52 RES., CHIP, 10k, 1%, 0603 NIC, NRC06F1002TRF
20 1 R27 RES., CHIP, 22.6k, 1%, 0603 VISHAY, CRCW060322K6FKEA
21 2 R44, R45 RES., CHIP, 4.99k, 1%, 0603 NIC, NRC06F4991TRF
22 1 R22 RES., CHIP, 4.75k, 1%, 0603 VISHAY, CRCW06034K75FKEA
23 3 R17, R35, R38 RES., CHIP, 0Ω, 0.5W, 1210 VISHAY, CRCW12100000Z0EF
24 1 R53 RES., CHIP, 0.01, 1/2W, 1%, 2010 VISHAY, WSL2010R0100FEA
25 1 U1 IC, LTM4676EY#PBF LINEAR TECH. LTM4676EY#PBF
26 1 U2 IC, EEPROM 2KBIT 400KHZ SOT23-6 MICROCHIP, 24LC025T-E/OT
Additional Demo Board Circuit Components
1 0 C16, C17, COUT9, COUT10 (OPT) CAP., OPTIONAL OPT
2 0 R4, R6, R8, R20, R23, R33, R34 (OPT) RES., 0603 OPT
3 0 R36, R37, R39, R16, R26, R28-R31 (OPT) RES., CHIP OPTIONAL OPT
4 0 R50 (OPT) RES., CHIP, 30Ω, 1%, 2512 OPT
Hardware-For Demo Board Only
1 21 E2-E6, E8-E20, E22-E24 TESTPOINT, TURRET, 0.062" MILL-MAX, 2308-2-00-80-00-00-07-0
2 1 XJP1 SHUNT SAMTEC, 2SN-BK-G
3 4 (STAND-OFF) STAND-OFF, NYLON 0.50" tall KEYSTONE, 8833 (SNAP ON)
4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2087A

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DEMO MANUAL DC2087A
SCHEMATIC DIAGRAM

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DEMO MANUAL DC2087A
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 representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM