Linear Technology LTM4677EY Quick setup guide

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dc2066af
DEMO MANUAL DC2066A
DESCRIPTION
LTM4677EY
Dual 18A or Single 36A µModule Regulator
With Digital Power System Management
Demonstration circuit 2066A is a dual-output,high ef-
ficiency, high density, µModule regulator with 4.5V to
16V input range.Each output can supply 18A maximum
load current.The demo board has a LT M
®
4677 µModule
regulator, which is a dual 18A or single 36A step-down
regulator with digital power system management.Please
see the LTM4677 data sheet for more detailed information.
DC2066A powersup todefault settingsand producespower
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 LTC’s
I2C/SMBus/PMBus dongle DC1613A to connect to the
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
BOARD PHOTO
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 L
TpowerPlay,please
refer to LTpowerPlay GUI for LTM4677 Quick Start Guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2066A
Figure1. Dual-Output LTM4677/DC2066A Demo Circuit

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DEMO MANUAL DC2066A
QUICK START PROCEDURE
Table 2. LTM4677 Demo Boards for Up To 140A Point-of-Load Regulation
MAXIMUM OUTPUT CURRENT NUMBER OF OUTPUTS
NUMBER OF LTM4676
µMODULE REGULATORS ON THE BOARD DEMO BOARD NUMBER
Dual 18A 2 1 DC2066A
70A 1 2 DC2143A-A
105A 1 3 DC2143A-B
140A 1 4 DC2143A-C
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 GUI for the LTM4677
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.
Demonstration circuit 2066A is easy to set up to evaluate
the performance of the LTM4677EY. 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 to 16V) and GND (input return).
2. Connect the 1.0V output load between VOUT0 and GND
(Initial load: no load).
3. Connect the 1.8V output load between VOUT1 and GND
(Initial load: no load).
4. Connect the DVMs to the input and outputs.Set default
jumper position: SW1: ON; SW2: ON.
5. Turn on the input power supply and check for the proper
output voltages.VOUT0 should be 1.0V ±1%, and VOUT1
should be 1.8V ±1%.
PERFORMANCE SUMMARY
Table 1. Performance Summary (TA= 25°C)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 4.5 16 V
Output Voltage, VOUT0 VIN = 4.5V to 16V, IOUT0 = 0A to 18A 0.5 1.8 V
Maximum Output Current, IOUT0 VIN = 4.5V to 16V, VOUT0 = 0.5V to 1.8V 18 A
Output Voltage, VOUT1 VIN = 4.5V to 16V, IOUT1 = 0A to 18A 0.5 1.8 V
Maximum Output Current, IOUT1 VIN = 4.5V to 16V, VOUT1 = 0.5V to 1.8V 18 A
Typical Efficiency VIN = 12V, VOUT1 = 1.8V, IOUT1 = 18A 87.9
(See Figures 5 and 6)
%
Default Switching Frequency 500 kHz

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DEMO MANUAL DC2066A
+
–
LOAD1
0A TO 18A
+
–
IOUT1
VOUT1
+–
LOAD0
0A TO 18A
+–
IOUT0
VOUT0
+
–
+–
IIN
4.5V TO 16V
VIN
DC2066A F02
+ –
VOUT GND
COUT
Figure2. Proper Measurement Equipment Setup
Figure3. Measuring Output Voltage Ripple
QUICK START PROCEDURE

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dc2066af
DEMO MANUAL DC2066A
QUICK START PROCEDURE
Connecting a PC to DC2066A
You can use a PC to reconfigure the power management
features of the LTM4677 such as:nominal VOUT,margin
setpoints,OV/UV limits,temperaturefault limits,sequenc-
ing parameters,the fault log,fault responses,GPIOs and
otherfunctionalities.The DC1613A dongle may be plugged
when VIN is present.
VOUT0
VOUT1
12-PIN (J1)
CONNECTOR
USB CABLE VIN
INPUT POWER
SUPPLY
LOAD0
LOAD 1
USB TO I2C/PMBus
DONGLE DC1613A
LTM4677 DEMO
BOARD DC2066A
LOAD CURRENT (A)
0.0
EFFICIENCY (%)
95
65
85
75
90
80
70
60 10.06.0 14.0 18.08.0 16.04.0 12.02.0
VO= 0.9V
VO= 1.0V
VO= 1.2V
VO= 1.5V
VO= 1.8V
VIN = 5V, fS= 500kHz, CCM
LOAD CURRENT (A)
0.0
EFFICIENCY (%)
95
65
85
75
90
80
70
60 10.06.0 14.0 18.08.0 16.04.0 12.02.0
VO= 0.9V
VO= 1.0V
VO= 1.2V
VO= 1.5V
VO= 1.8V
VIN = 12V, fS= 500kHz, CCM
Figure4. Demo Setup with PC
Figure5. Efficiency vs Load Current at VIN=5V Figure6. Efficiency vs Load Current at VIN=12V

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DEMO MANUAL DC2066A
QUICK START PROCEDURE
Figure7. Output Voltage VOUT0 vs Load Current
(VOUT0=1.0V), Measured by 1X Probe on COUT8
Figure9. Output Voltage Ripple at VIN=12V,
VOUT0=1.0V, IOUT0=18A, Measured by 1X Probe on COUT8
Figure8. Output Voltage VOUT1 vs Load Current
(VOUT1=1.8V), Measured by 1X Probe on COUT3
Figure10. Output Voltage Ripple at VIN = 12V,
VOUT1 = 1.8V, IOUT1 = 18A, Measured by 1X Probe on COUT3
Figure11. Thermal at VIN = 12V, VOUT0=1.0V, IOUT0 = 18A, VOUT1 = 1.8V, IOUT1 = 18A, TA= 25°C, 200LFM Airflow
50µs/DIV
0A TO 4.5A
LOAD STEP
VOUT0
(20MHz BW)
20mV/DIV
50µs/DIV
0A TO 4.5A
LOAD STEP
VOUT1
(20MHz BW)
20mV/DIV
1.0µs/DIV
VOUT0
(20MHz BW)
20mV/DIV
VOUT1
(20MHz BW)
20mV/DIV
1.0µs/DIV

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DEMO MANUAL DC2066A
LTpowerPlay SOFTWARE GUI
LTpowerPlay is a powerful Windows based development
environment that supports Linear Technology power
system management ICs and μModules, including the
LTM4675, LTM4676, LTM4677, 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 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 LTM4675,
LTM4676, LTM4677, LTC3880, LTC3882, LTC3883’s
demo system or a customer board.The software also
provides an automatic update feature to keep the software
currentwith the latestset ofdevice driversand documenta-
tion. The LTpowerPlay software can be downloaded from:
http://linear.com/ltpowerplay
To access technical support documents for LTC Digital
Power Products visit Help.View online help on the
LTpowerPlay menu.
Figure 12. LTpowerPlay Main Interface

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DEMO MANUAL DC2066A
LTpowerPlay QUICK START GUIDE
The followingprocedure describes howto use LTpowerPlay
to monitor and change the settings of LTM4677.
1.Download and install the LTpowerPlay GUI:
http://linear.com/ltpowerplay
2. Launch the LTpowerPlay GUI.
a. The GUI should automatically identify the DC2066A.
The system tree on the left hand side should look
like this:
b. A blue message box shows for a few seconds in the
lower left hand corner,confirming that LTM4677 is
communicating:
c. In the Toolbar,click the “R” (RAM to PC)icon to
read the RAM from the LTM4677. This reads the
configuration from the RAM of LTM4677 and loads
it into the GUI.
Then,click the “W” (PC to RAM)icon to write these
register values to the LTM4677.After finishing this
step,youwillseetheoutputvoltagewillchangeto1.5V.
If the write is successful,you will see the following
message:
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.
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:

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DEMO MANUAL DC2066A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 CAP., 150µF, 35V, ALUMINUM ELECTR., SUN ELECTRONIC INDUSTRIES,35CE150AX
2 4 CIN2, CIN3, CIN4, CIN5 CAP., X5R, 10µF, 35V, 10%, 1210 MURATA, GRM32ER6YA106KA12
3 6 COUT1-COUT3, COUT6-COUT8 CAP., X5R, 100µF, 6.3V, 20% 1210 AVX, 12106D107MAT2A
4 6 COUT4, COUT5, COUT9-12 CAP., 470µF, 2.5V, SP-CAP, D SIZE PANASONIC, EEFGX0E471R
5 1 C26 CAP., X5R, 100nF, 16V, 10%, 0603 AVX, 0603YD104KAT
6 2 C27, C28 CAP., X7R, 10nF, 25V, 5%, 0603 AVX, 06033C103JAT
7 1 C23 CAP., X7R, 1µF, 25V, 10%, 0805 AVX, 08053C105KAT2A
8 3 C21, C22, C24 CAP., X5R, 1µF, 25V, 10%, 0603 AVX, 06033D105KAT2A
9 12 R10-R16, R18, R19, R24, R52, R77 RES., CHIP, 10k, 1%, 0603 NIC, NRC06F1002TRF
10 1 R30 RES., CHIP, 6.34k, 1%, 0603 VISHAY, CRCW06036K34FKEA
11 2 R72, R73 RES., CHIP, 4.99k, 1%, 0603 NIC, NRC06F4991TRF
12 1 U1 I.C., LTM4677EY#PBF LINEAR TECH., LTM4677EY#PBF
13 1 U2 I.C., EEPROM SERIAL-I2C, 2k-BIT, I.C., TSSOP-8 MICROCHIP, 24LC025-I/ST
14 2 R2, R22 RES., CHIP, 17.8k, 1%, 0603 VISHAY, CRCW060317K8FKEA
15 2 C1, C14 CAP., X7R, 1.8nF, 25V, 5%, 0603 AVX, 06033C182JAT2A
Additional Demo Board Circuit Components
16 0 C2, C15-C17 (OPT) CAP., 0603 OPTIONAL
17 1 Q1 N-CHANNEL 30-V MOSFET VISHAY, SUD50N03-09P
18 10 R3, R7, R9, R25, R31, R32, R33,
R63, R65, R66
RES., CHIP, 0Ω, 1%, 0603 NIC, NRC06Z0000TRF
19 0 R8, R26, R27, R28, R29, R35, R38,
R41, R61, R62, R64, R67, R68, R74,
R75, R83, R88, R89, R6, R23 (OPT)
RES., 0603 OPTIONAL
20 0 R17, R20, R49, R82 (OPT) RES., CHIP OPTIONAL
21 1 R48 RES., CHIP, 0Ω, 0.5W, 2010 NIC, NRC50ZOTRF
22 1 R53 RES., CHIP, 0.01Ω, 1/2W, 1%, 2010 VISHAY, WSL2010R0100FEA
23 2 R69, R70 RES., CHIP, 10Ω, 1%, 0603 NIC, NRC06F10R0TRF
24 1 R78 RES., CHIP, 15.8k, 1%, 0603 NIC, NRC06F1582TRF
25 0 D1, D2 (OPT) DIODE OPTIONAL
26 1 Q19 MOSFET P-CH 20V 0.58A SOT-23 VISHAY TP0101K-T1-E3
Hardware: For Demo Board Only
27 2 SW0, SW1 HEADER 3 PIN 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S
28 3 J2-J4 CONN, BNC, 5 PINS CONNEX, 112404
29 1 J1 CONN HEADER 12POS 2mm STR DL PCB FCI 98414-G06-12ULF
30 24 E1-E24 TESTPOINT, TURRET, 0.062" MILL-MAX, 2308-2-00-80-00-00-07-0
31 6 J5-J10 BANANA SMALL KEYSTONE, 575-4
32 2 XJP1, XJP2 SHUNT SAMTEC, 2SN-BK-G
33 4 (STAND-OFF) STAND-OFF, NYLON 0.50" tall KEYSTONE, 8833(SNAP ON)
34 1 J12 CONN RECEPT 2mm DUAL R/A 14POS SULLINS, NPPN072FJFN-RC
35 1 J11 CONN HEADER 14POS 2mm R/A GOLD MOLEX, 87760-1416

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dc2066af
DEMO MANUAL DC2066A
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603.
35V
4.5V - 16V
1.0V / 18A
2.5V
EEFGX0E471R
1.8V / 18A
2.5V
EEFGX0E471R
1210 1210 1210
1210 1210 1210 1210
1210 1210 1210
0.035 VIA TESTPOINTS
WITH DIGITAL POWER MANAGEMENT
*
WHEN VIN < 5.75V, SHORT INTVCC TO VIN WITH R8 = 0ohm.
*
OFF
ON
ON OFF
VOSNS0+
VOSNS0-
SYNC SHARE_CLK ALERTB
SCL
SDA
GPIO0B GPIO1B
ASEL
FREQ_CFG
VOUT0_CFG VTRIM0_CFG
VOUT1_CFG
VTRIM1_CFG
RUN1
VDD25 RUN0
INTVCC
VOSNS1
VIN
VOUT0
VOUT1
VIN
SYNC SHARE_CLK
ALERTB
SCL SDA
GPIO0B
GPIO1B
COMP0a
COMP1a
RUN0
RUN1
VDD33
SIZE DATE:
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TITLE:
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PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
1630 McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED 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
1
Friday, July 17, 2015
1 3
DUAL STEP-DOWN uMODULE REGULATOR
HZ
HAORAN W.
B
LTM4677EY DEMO CIRCUIT 2066A
SIZE DATE:
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SHEET OF
TITLE:
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PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
1630 McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED 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
1
Friday, July 17, 2015
1 3
DUAL STEP-DOWN uMODULE REGULATOR
HZ
HAORAN W.
B
LTM4677EY DEMO CIRCUIT 2066A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
1630 McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED 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
1
Friday, July 17, 2015
1 3
DUAL STEP-DOWN uMODULE REGULATOR
HZ
HAORAN W.
B
LTM4677EY DEMO CIRCUIT 2066A
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
HAORAN W.PRODUCTION 51-71-71
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
HAORAN W.PRODUCTION 51-71-71
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
HAORAN W.PRODUCTION 51-71-71
__
E13
GPIO0B
E4
VIN
COUT1 100uF
+
COUT11 470uF
EEFGX0E471R
2.5V
CIN3 10uF
J7
VOUT0
R18 10K
CIN2 10uF
R9 0
SW0
RUN0
1 3
2
E9
SYNC
R10 10K
+
COUT10 470uF
EEFGX0E471R
2.5V
R7 0
E17
GND0_SNS
R33
0
COUT7
100uF
R8 OPT
C2
OPT
J10
VIN
CIN5 10uF
R20 OPT
0805
J5
GND
U1
LTM4677EY
VOUT0
A1
VOUT0
A2
VOUT0
A3
VOUT0
D1
VOUT1 J1
VOUT1 J2
VOUT1 J3
VOUT1 K1
VOUT0
B1
VOUT0
B2
VOUT0
B3
VOUT0
D2
VOUT1 K2
VOUT1 K3
VOUT1 L1
VOUT1 L2
VOUT0
C1
VOUT0
C2
VOUT0
C3
VOUT0
D3
GND
A4
GND
A6
GND
A7
GND
A8
VOUT1 L3
VOUT1 M1
VOUT1 M2
VOUT1 M3
GND
A9
GND
A10
GND
B4
GND
B5
ASEL G4
FSWPHCFG H4
GND
B6
GND
B7
GND
B8
GND
B9
GPIO0 E4 GPIO1 F4
SNUB0
A5
GND
C4
TSNS0B
C5
TSNS0A
D5
ALERT E5
RUN0 F5
VOUT0CFG G5
VTRIM0CFG H5
TSNS1A J5
TSNS1B K5
GND
C6
SNUB1 M5
GND
C7
GND
C8
GND
C9
SDA D6
SCL E6
RUN1 F6
VOUT1CFG G6
VTRIM1CFG H6
VDD25 J6
WP K6
GND
D4
GND
E3
GND
F3
GND
F10
GND
G3
GND
G10
SYNC E7
GND
M9
GND
M10
SHARE_CLK H7
VDD33 J7
GND
G11
GND
G12
GND
L8 GND
L7
GND
L9
GND
H3
COMP0b
D8
COMP0a
E8
SGND
F7
SGND
F8
COMP1a H8
COMP1b J8
GND
H10
GND
J4
GND
M8
VOSNS0+
D9
VOSNS0-
E9
INTVCC F9
INTVCC G9
VOSNS1 H9
VORB1 J9
GND
J10
GND
L4
GND
L5
GND
K4
SW0
B10
NC
E11
VORB0+
D10
VORB0-
E10
GND
L6
GND
K7
GND
K8
GND
K9
NC
C10
SW1 L10
GND
M4
VIN0
B12 VIN0 B11 VIN0 A12 VIN0
A11
NC
K10
SVIN
F12
GND
M6
NC
H11
VIN1 H12
VIN1 J11
VIN1 J12
VIN1 K11
VIN0
E12 VIN0
D12 VIN0
D11 VIN0 C12 VIN0 C11
SVIN
F11
GND
M7
VIN1 K12
VIN1 L11
VIN1 L12
VIN1 M11
VIN1 M12
SGND
G7
SGND
G8
GND
D7
ISNS0a-
E1
ISNS0b-
E2
ISNS0b+
F1 ISNS0a+
F2
ISNS1b-G1
ISNS1a-G2
ISNS1b+H1
ISNS1a+H2
E16
VDD25
R14 10K
R32 0
COUT8
100uF
C14
1.8nF
C1
1.8nF
+
COUT5 470uF
P1
R24 10K
R30
0
E7
GND1_SNS
SW1 RUN1
1
3
2
R29 (OPT)
R16 10K
E8
VDD33
COUT6
100uF
E12
SDA
C15 OPT
P2
J8
GND
R25
0
+
COUT9 470uF 2.5V EEFGX0E471R
P4
C17 OPT
R11 10K
+
COUT4
470uF
R19 10K
P5
R23 OPT
R3 0
E14
GPIO1B
COUT3 100uF
E15
VOUT0_SNS
COUT2 100uF
J9
GND
R6 OPT
R27 (OPT)
E3
INTVCC
+
CIN1 150uF
R15 10K
R2 17.8K
E1
VOUT1_SNS
E10
ALERTB
R17 OPT
0805
R13 10K
E11
SCL
R22
17.8K
+
COUT12 470uF
EEFGX0E471R
2.5V
R12 10K
E6
SHARE_CLK
P3
CIN4 10uF
R28 (OPT)
E2
GND
C16 OPT
J6 VOUT1
R31
6.34K
R26 (OPT)
E5
GND
Figure12. DC2066A Demo Circuit Schematic, Page 1

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dc2066af
DEMO MANUAL DC2066A
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D CC
B B
A A
ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN
OPT
2010 2010
OPT
VOUT1
DYNAMIC LOAD CIRCUIT
DO NOT EXCEED 5% DUTY CYCLE!
BLEEDER LOADS
OPTIONAL JUMPER FOR DUAL PHASE SINGLE OUTPUT CONFIGURATION
2010
WITH DIGITAL POWER MANAGEMENT
VOUT0 VOUT1 VOUT0 VOUT1
COMP0a COMP1a
GPIO0B GPIO1B
RUN0RUN1
SIZE
DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
1630 McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED 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
1
Friday, July 17, 2015
2 3
DUAL STEP-DOWN uMODULE REGULATOR
HZ
HAORAN W.
N/A
LTM4677EY
DEMO CIRCUIT 2066A
SIZE
DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
1630 McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED 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
1
Friday, July 17, 2015
2 3
DUAL STEP-DOWN uMODULE REGULATOR
HZ
HAORAN W.
N/A
LTM4677EY
DEMO CIRCUIT 2066A
SIZE
DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
1630 McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED 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
1
Friday, July 17, 2015
2 3
DUAL STEP-DOWN uMODULE REGULATOR
HZ
HAORAN W.
N/A
LTM4677EY
DEMO CIRCUIT 2066A
R52 10K
R38 OPT
E22
GND
J3
1
2
3
4
5
R50
Q1
SUD50N03-09P
2
1
3
4
R49 2010 OPT
J4
IOSTEP
1
2
3
4
5
E23
SGND
R48 2010 0.5W
0
R35 OPT
J2
VOUT0
1
2
3
4
5
C24 1uF
C22 1uF
R41 OPT
E20
IOSTEP_CLK
R51
E24
SGND
C21 1uF
R53
0.01
C23 1uF
Figure13. DC2066A Demo Circuit Schematic, Page 2

11
dc2066af
DEMO MANUAL DC2066A
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
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
PSM STACKING CONNECTORS:
J12, FEMALE, CONN RECEPT 2MM DUAL R/A 14POS, Sullins Conn. NPPN072FJFN-RC
J11, MALE, CONN HEADER 14POS 2MM R/A GOLD, Molex Connector Corp. 87760-1416
OPTIONAL CIRCUIT FOR PROGRAMMING WITHOUT VIN
1206
AUXVCC
EEWP
EESDA
EESCL
3V3
VIN
3V3 VDD33
VIN
3V3
VDD33
ALERTB SDA SCL
RUN0 RUN1
GPIO1B
GPIO0B
SYNC
SHARE_CLK
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED 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
1
Friday, July 17, 2015
3 3
DUAL STEP-DOWN uMODULE REGULATOR
HZ
HAORAN W.
B
LTM4677EY
DEMO CIRCUIT 2066A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED 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
1
Friday, July 17, 2015
3 3
DUAL STEP-DOWN uMODULE REGULATOR
HZ
HAORAN W.
B
LTM4677EY
DEMO CIRCUIT 2066A
SIZE DATE:
.VER.ONCI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035
Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED 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
1
Friday, July 17, 2015
3 3
DUAL STEP-DOWN uMODULE REGULATOR
HZ
HAORAN W.
B
LTM4677EY
DEMO CIRCUIT 2066A
C28 10nF
U2
24LC025-I/ST
A0
1
A1
2
A2
3
VSS
4SDA 5
SCL 6
WP 7
VCC 8
R77 10K
E21
AUXP
R74 OPT
R67 OPT
R64 OPT
J11 DEMO HEADER (M)
FAULTB
1
CTRL
2
ALERTB
3
SDA
4
SHARE_CLK
5
SCL
6
RESETB
7
AUXP
8
UNUSED
9
UNUSED
10
GND
11
GND
12
12V
13
12V
14
R70 10
R89 OPT
R73 4.99K
E19
RUN1
R82 OPT
E18
RUN0
R75 OPT
R72 4.99K
R88 OPT
R69 10
C26
100nF
R65 0
D1 OPT
R83 OPT
R68 OPT
J12DEMO HEADER (F)
FAULTB 1
CTRL 2
ALERTB 3
SDA 4
SHARE_CLK 5
SCL 6
RESETB 7
AUXP 8
UNUSED 9
UNUSED 10
GND 11
GND 12
12V 13 12V 14
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
R78 15.8k
C27 10nF
D2 OPT
R61 OPT
Q19
TP0101K
23
1
R63 0
R62 OPT
R66
0
Figure14. DC2066A Demo Circuit Schematic, Page 3

12
dc2066af
DEMO MANUAL DC2066A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2015
LT 0915 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) 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 applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation