Linear Technology DC2269A-A Quick setup guide

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DEMO MANUAL DC2269A-A
Description
LTM4676EY
Dual Step-Down µModule Regulator
with PMBus Power System Management
Demonstration circuit 2269A-A is a dual-output, high ef-
ficiency,highdensity,µModule
®
supplyonasmall1.5"×1.2"
PCB board with 4.5V to 26.5V input range. Each output
can supply 13A 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. The DC2269A can be easily inserted
to an edge connector for testing and debugging. It has an
optional input filter inductor (L1) to further reduce input
ripple EMI noise.
DC2269A-A powers up to default settings and produce
power based on configuration resistors without the need
for any serial bus communication. This allows easy evalu-
ation 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
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.
performance summary
LT C ’s I2C/SMBus/PMBus dongle DC2086A together with
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, cur-
rent, 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/DC2269A-A
Specifications are at TA= 25°C
Figure 1. Dual-Output LTM4676/DC2269A-A Demo Circuit
PARAMETER CONDITIONS VALUE
Input Voltage Range 4.5V to 26.5V
Output Voltage, VOUT0 VIN = 4.5V to 26.5V, IOUT0 = 0A to 13A 0.5V to 4V, Default: 1V
Maximum Output Current, IOUT0 VIN = 4.5V to 26.5V, VOUT = 0.5V to 4V 13A
Output Voltage, VOUT1 VIN = 4.5V to 26.5V, IOUT1 = 0A to 13A 0.5V to 5.4V, Default: 1.8V
Maximum Output Current, IOUT1 VIN = 4.5V to 26.5V, VOUT = 0.5V to 5.4V 13A
Typical Efficiency VIN = 12V, VOUT = 1.8V, IOUT = 13A 86.3%
Default Switching Frequency 500kHz

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DEMO MANUAL DC2269A-A
Quick start proceDure
Table 1. LTM4676 Demo Cards for Up to 100A Point-of-Load Regulation
MAXIMUM OUTPUT CURRENT
NUMBER OF OUTPUT
VOLTAGES
NUMBER OF LTM4676 µMODULE
REGULATORS ON THE BOARD DEMO BOARD NUMBER
13A, 13A 2 1 DC1811A
13A, 13A 2 1 DC2269A-A
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
DC2269A-A is easy to set up to evaluate the performance
of the LTM4676EY. It can be easily inserted to an edge
connector (SAMTEC MEC2-20-01-L-DV--TR) for testing
and debugging. Refer to Figure 2 for the proper measure-
ment equipment setup and follow the procedure below.
1. With power off, connect the input power supply to VIN
(4.5V-26.5V) and GND (input return).
2. Connect the 1.0V output load between VOUT and GND
(Initial load: no load).
3. Connect the 1.8V output load between VOUT and GND
(Initial load: no load).
4. Connect the DVMs to the input and outputs.
5. Turn on the input power supply and check for the proper
output voltages. VOUT0 should be 1.0V±1%, and VOUT1
should be 1.8 ±1%.
6. 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.
7. Connect the dongle and control the output volt-ages
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 DC2269A-A
You can use a PC to reconfigure the power management
features of the LTM4676 such as: nominal VOUT, margin
setpoints, OV/UV limits, temperature fault limits, sequenc-
ing parameters, the fault log, fault responses, GPIOs and
other functionality. The DC2086A dongle may be plugged
when VIN is present.

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DEMO MANUAL DC2269A-A
Quick start proceDure
Figure 2. Proper Measurement Equipment Setup
+ +
– –
+–
+
–
VIN 4.5V to 26.5V
Load0 (0~13A)
+
–
Load1 (0~13A)
+–
VOUT0
–+
VOUT1
DC2269A-A F02
Figure 3. Measuring Output Voltage Ripple
+ –
VOUT GND
COUT

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DEMO MANUAL DC2269A-A
USBtoI2C/PMBusDongle
DC1613A+DC2086A
LTM4676Demo
BoardDC2269AA
InputPower
Supply
USBCable VIN
4PIN(J1)
Connector
Load0
Vout0
Vout1
Load1
Quick start proceDure
Figure 4. Demo Setup with PC
LOAD CURRENT (A)
0
EFFICIENCY (%)
85
95
DC2269A-A F05
75
65 2 4 6 8 10 121 3 5 7 9 11 13
100
80
90
70
VOUT = 1V
VOUT = 1.2V
VOUT = 1.5V
VOUT = 1.8V
VOUT = 2.5V
VOUT = 3.3V
VIN = 5V
fSW = 500kHz
CCM
LOAD CURRENT (A)
0
EFFICIENCY (%)
80
90
DC2269A-A F06
70
60 2 4 6 8 10 121 3 5 7 9 11 13
95
75
85
65
VOUT = 1V
VOUT = 1.2V
VOUT = 1.5V
VOUT = 1.8V
VOUT = 2.5V
VOUT = 3.3V
VOUT = 5V
VIN = 12V
fSW = 500kHz
CCM
Figure 5. Efficiency vs Load Current at VIN = 5V Figure 6. Efficiency vs Load Current at VIN = 12V

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DEMO MANUAL DC2269A-A
Quick start proceDure
100µs/DIV DC2269A-A F07
VOUT0
20MHz BW
50mV/DIV
6.5A to 9.75A
LOAD STEP
100µs/DIV DC2269A-A F08
VOUT1
20MHz BW
50mV/DIV
6.5A to 9.75A
LOAD STEP
2µs/DIV DC2269A-A F09
VOUT0
20MHz BW
10mV/DIV
2µs/DIV DC2269A-A F10
VOUT0
20MHz BW
10mV/DIV
Figure 7. Output Voltage VOUT0
vs Load Current (VOUT0 RANGE = 1)
Figure 8. Output Voltage VOUT1
vs Load Current (VOUT1 RANGE = 1)
Figure 9. Output Voltage Ripple at
VIN = 12V, VOUT0 = 1V, IOUT0 = 13A
Figure 10. Output Voltage Ripple at
VIN = 12V, VOUT0 = 1.8V, IOUT0 = 13A
Figure 11. Thermal Performance at VIN = 12V, VOUT0 = 1V/11A, VOUT1 = 1.8V/11A,
fSW = 500kHz, TA= 23°C, 200LFM Airflow

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DEMO MANUAL DC2269A-A
LtpowerpLay software Gui
LTpowerPlay is a powerful Windows based development
environment that supports Linear Technology power sys-
tem management ICs, including the LTM4675, LTM4676,
LTC3880, LTC3882, 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 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 theDC1613Aand DC2086AUSB-
to-SMBus controller to communicate with one of many
potential targets, including the LTM4676, the LTC3880,
LTC3882 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
software can be downloaded from:
http://linear.com/ltpowerplay
To access technical support documents for LT C Digital
Power Products visit Help. View online help on the LT-
powerPlay menu.
Figure 12. LTpowerPlay Main Interface

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DEMO MANUAL DC2269A-A
LtpowerpLay Quick start proceDure
Thefollowingprocedure describes how touseLTpowerPlay
to monitor and change the settings of LTM4676.
1. Download and install the LTPowerPlay GUI:
http://linear.com/ltpowerplay
2. Launch the LTpowerPlay GUI.
a. TheGUIshould automatically identify theDC2269A-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 LTM4676
is communicating:
c. In the Toolbar, click the “R” (RAM to PC) icon to
read the RAM from the TM4676. This reads the
configuration from the RAM of LTM4676 and loads
it into the GUI.
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:
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.
Ifthewrite is successful,youwill see thefollowingmessage:
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.

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DEMO MANUAL DC2269A-A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 6 CIN1, CIN2, CIN3, CIN4, CIN5, CIN6 CAP, 1210 10µF 10% 25V X5R MURATA GRM32DR61E106KA12L
2 2 CO1, CO6 CAP, 7343 330µF 20% 6.3V POSCAP PANASONIC 6TPF330M9L
3 5 CO2, CO3, CO4, CO5, CO7 CAP, 1210 100µF 10% 6.3V X5R AVX 12106D107KAT2A
4 2 C1, C5 CAP, 0603 2200pF 10% 50V X7R AVX 06035C222KAT2A
5 2 C9, C10 CAP, 0805 47µF 20% 6.3V X5R MURATA GRM21BR60J476ME15L
6 2 C12, C13 CAP, 0603 10µF 20% 25V X5R MURATA GRM188R61E106MA73J
7 1 D1 DIODE, SCHOTTKY BARRIER RECTIFIER DIODES INC. B0530WS-7-F
8 1 J2 HEADER, 4PIN 2mm STR DL HIROSE DF3A-4P-2DSA
9 1 L1 IND, 1.0µH COILCRAFT XAL5030-102MEC
10 3 R1, R22, R39 RES, 0603 100Ω 5% 0.1W VISHAY CRCW0603100RJNEA
11 2 R6, R33 RES, 0603 0Ω VISHAY CRCW06030000Z0EA
12 1 R7 RES, 0603 4.99kΩ 1% 0.1W VISHAY CRCW06034K99FKEA
13 10 R10, R11, R12, R13, R14, R15, R16,
R17, R18, R21
RES, 0603 10kΩ 5% 0.1W VISHAY CRCW060310K0JNEA
14 1 R20 RES, 0603 4.22kΩ 1% 1/10W VISHAY CRCW06034K22FKEA
15 1 R29 RES, 0603 6.34kΩ 1% 0.1W VISHAY CRCW06036K34FKEA
16 3 R36, R37, R38 RES, 0603 10Ω 5% 0.1W VISHAY CRCW060310R0JNEA
17 1 U1 IC, VOLTAGE REGULATOR LGA LINEAR TECH. LTM4676EY#PBF
Additional Demo Board Circuit Components
1 0 C2, C3, C4, C6, C7, C8, C11 CAP, 0603 OPTION OPTION
2 0 R2, R19, R31, R32 RES, 0805 OPTION OPTION
3 0 R3, R4, R5, R8, R9, R23, R24, R25,
R27, R28
RES, 0603 OPTION OPTION
4 0 R35 RES, 1206 OPTION OPTION
0 R40 RES, 1210 OPTION OPTION
Hardware: For Demo Board Only
1 1 J1 CONN., CARD EDGE SAMTEC MEC2-20-01-L-DV--TR

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DEMO MANUAL DC2269A-A
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
VOS0+R
VOUT1
CO5
100uF 6.3V 1210
V OUT1
CIN5
10uF 25V
1210
V IN1
C2 OPT
CIN6
10uF 25V
1210
R38 10
VOS0-R
C9 47uF 0805 6.3V
COMP1A
CO2
100uF 6.3V 1210
CO7
100uF 6.3V 1210
P2
V OUT0
R21
10K
R6 0
L1 1uH
R36
10
C6 OPT
R20
4.22k 1%
VOS0+R
VOUT1
R9
OPT
P6
R39 100
OPT
C8
C11 OPT
VOSNS0-
VDD33
R40
OPT
1210
CIN3
10uF 25V
1210
R8
OPT
GPIO1BGPIO0B
R11 10K
R3
OPT
R32 OPT 0805
P5
U1 LTM4676EY
VOUT0 A1 VOUT0 A2 VOUT0 A3
GND
A4
SNUB0
A5
VOUT0 B1 VOUT0 B2 VOUT0 B3
GND
B4
GND
B5
VOUT0 C1 VOUT0 C2 VOUT0 C3
GND
C4
TSNS0A
D5
ISNS1A- G2
INTVCC G9
SCL E6
RUN0 F5
ALERT E5
TSNS0B
C5
GND
A8
GND
A9
GND
A10
VIN0
A11
VIN0
A12
GND
B8
GND
B9
SW0
B10
VIN0
B11
VIN0
B12
GND
C9
DNC C10
VIN0
C11
VIN0
C12
GND
D7
GND
G11
SGND
G8
SYNC E7
INTVCC F9
COMP0B
D8
GND
C8
VOUT1 M2
VOUT1 M3
GND
M4
SNUB1 M5
GND
M6
GND
M7
GND
M8
GND
M9
GND
M10
VIN1 M11
VOUT1 L2
VOUT1 L3
GND
L4
GND
L5
GND
L6
GND
L7
GND
L8
GND
L9
SW1 L10
VIN1 L11
VOUT1 K2
VOUT1 K3
GND
K4
GND
K9
DNC K10
VIN1 K11
VOUT1 J2
VOUT1 J3
GND
J4
VCRB1 J9
GND
J10
VIN1 J11
GND
A6
GND
A7
GND
B6
GND
B7
VOUT0 D1 VOUT0 D2 VOUT0 D3
GND
D4
VOSNS0+
D9
VORB0+
D10
VIN0
D11
VIN0
D12
ISNS0B-
E1
ISNS0A-
E2
GND
E3
GPIO0 E4
VORB0-
E10
DNC E11
VIN0
E12
ISNS0B+
F1
ISNS0A+
F2
GND
F3
GND
F10
SVIN
F11
SVIN
F12
ISNS1B- G1
GND
G3
GND
G10
GND
G12
ISNS1B+ H1
ISNS1A+ H2
GND
H3
FSWPHCFG
H4
VTRIM0CFG
H5
VTRIM1CFG
H6
SHARE_CLK H7
VOSNS1 H9
GND
H10
DNC H11
VIN1 H12
VIN1 M12
VOUT1 M1
VIN1 L12
VOUT1 J1
TSNS1A J5
COMP1B J8
VIN1 J12
VOUT1 K1
TSND1B K5
WP K6
GND
K7
GND
K8
VIN1 K12
VOUT1 L1
SDA D6
RUN1 F6
SGND
F7
VOUT1CFG
G6
SGND
G7
GND
C6
ASEL
G4
COMP0A
E8
VOSNS0-
E9
VOUT0CFG
G5
GPIO1 F4
VDD25 J6
COMP1A H8
VDD33 J7
SGND
F8
GND
C7
V OUT0
R12 10K
CO4
100uF 6.3V 1210
R31 OPT 0805
SDA
R1
100
R22 100
C7 OPT
R13 10K
SCL
CIN1
10uF 25V
1210
C3 OPT
R14 10K
VOS1+R
CIN2
10uF 25V
1210
VOS1+R
R19
OPT
0805
V OUT0
C4 OPT
R15 10K
R24 OPT
C10 47uF 0805 6.3V
V OUT1
OPTIONAL JUMPER FOR DUAL PHASE
SINGLE OUTPUT CONFIGURATION
VOUT0
R35 OPT
1206
SV IN
R25 OPT
P3
R16 10K
R27 OPT
+CO6
330uF 6.3V
R17 10K
R28 OPT
RUN1RUN0 R4
OPT
V IN2
P1
CO3
100uF 6.3V 1210
R33 0
R18 10K
COMP1 ACOMP0 A R5
OPT
R23 OPT
µ
SHARE_CLK
RUN1
VOUT0
VDD33
RUN0
R2
OPT 0805
ALER TB
J1
VIN
1VIN 2
VIN
3VIN 4
GND
5GND 6
GND
7GND 8
GND
9GND 10
GND
11 GND 12
GND
13 GND 14
N/A
15 N/A 16
GND
17 GND 18
VOS1+
19 GND 20
VOS1-
21 RUN1 22
VOS2+
23 RUN2 24
VOUT1
25 VOUT1 26
VOUT1
27 VOUT1 28
VOUT1
29 VOUT1 30
VOUT1
31 VOUT1 32
VOUT2
33 VOUT2 34
VOUT2
35 VOUT2 36
VOUT2
37 VOUT2 38
VOUT2
39 VOUT2 40
V IN1
VOUT1
R10 10K
RUN1 SCL
VOUT0
J2
SDA 1
GND 2
SCL 3
AUX3V4 4
VOSNS0-
P4
C5 2200pF
R37 10
R7 4.99k 1%
SDA
V IN1
+CO1
330uF 6.3V
7343
SV IN
VOS0-R
VOSNS0-
GPIO0B
C12 10uF 25V
RUN0
D1 B0520WS-7-F
GPIO1B
R29 6.34k 1%
C1 2200pF
SIZE DATE:
IC NO. REV .
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
1630 McCarthy Blvd.
LTC CON FI DEN TIA L - FOR C USTOM ER USE ON LY
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 RELIABLEOPERATION IN THEACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
DEMO CIRCUIT 2269A
Monday, October 13, 2014 11
HIGH EFFICIENCY , DC/DC STEP-DOWN, MODULE
N/A LTM4676EY
REGULAT OR WIT H POWER SY STEM MANAGEMENT
C:\PROJECTS\LTM4676\DEMO BOARD DC2269A\1013\2269A-2.DSN
COMP0A
C13 10uF 25V
SYBC
CIN4
10uF 25V
1210

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dc2269aaf
DEMO MANUAL DC2269A-A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2015
LT 0515 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation