Linear Technology DC1989B-C Quick setup guide

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dc1989bcf
DEMO MANUAL DC1989B-C
DESCRIPTION
LTM4676AEY
Dual 13A or Single 26A µModule Regulator
with Digital Power System Management
4× LTM4676A, 100A
Demonstration circuit 1989B-C is a high efficiency, high
density, µModule regulator with 4.5V to 17V input range.
The output voltage is adjustable from 0.5V to 4V, and it can
supply 100A maximum load current. The demo board has
four LT M
®
4676A µModule regulators. The LTM4676A is a
dual 13A or single 26A step-down regulator with PMBus
power system management. Please see LTM4676A data
sheet for more detailed information
DC1989B-C powers up to default settings and produces
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
LT C ’s I2C/SMBus/PMBus dongle DC1613A to connect to
L, LT, LTC, LTM, Linear Technology, the Linear logo, Dust Networks and Dust are registered
trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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:
http://www.linear.com/ltpowerplay
For more details and instructions of LTpowerPlay, please
refer to LTpowerPlayGUI for LTM4676AQuick Start Guide.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1989B-C
Figure 1. 4× LTM4676A; 100A DC1989B-C Demo Circuit

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DEMO MANUAL DC1989B-C
QUICK START PROCEDURE
Demonstration circuit 1989B-Cis easy to set up to evaluate
the performance of the LTM4676AEY. 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 17V) and GND (input return).
2. Connect the 1V output load between VOUT0 and GND
(Initial load: no load).
3. Connect the DVMs to the input and outputs. Set default
switch position: SW1: ON; SW2: ON.
4. Turn on the input power supply and check for the proper
output voltages. VOUT0 should be 1V ±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 LTM4676A
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 DC1989B-C
You can use a PC to reconfigure the power management
features of the LTM4676A such as: nominal VOUT, margin
setpoints, OV/UVlimits,temperaturefaultlimits,sequenc-
ing parameters, the fault log, fault responses, GPIOs and
other functionality. The DC1613A dongle may be plugged
when VIN is present.
PERFORMANCE SUMMARY
Specifications are at TA= 25°C
PARAMETER CONDITION VALUE
Input Voltage Range 4.5V to 17V
Output Voltage, VOUT0 VIN = 4.5V to 17V, IOUT0 = 0A to 100A 0.5V to 4V, Default: 1V
Maximum Output Current, IOUT0 VIN = 4.5V to 17V, VOUT = 0.5V to 4V 100A
Typical Efficiency VIN = 12V, VOUT = 1V, IOUT = 100A 80.4%
Default Switching Frequency 350kHz
Table 1. LTM4676/LTM4676A Demo Cards for Up to 130A Point-of-Load Regulation
MAXIMUM OUTPUT CURRENT NUMBER OF OUTPUT VOLTAGES
NUMBER OF LTM4676/LTM4676A µMODULE
REGULATORS ON THE BOARD DEMO BOARD NUMBER
13A, 13A 2 1× LTM4676 DC1811A/DC1811B-A
13A, 13A 2 1× LTM4676A DC1811B-B
26A 1 1× LTM4676 DC2087A
50A 1 2× LTM4676A DC1989B-A
75A 1 3× LTM4676A DC1989B-B
100A 1 4× LTM4676A DC1989B-C
100A 1 1× LTM4676 (+ 3× LTM4620A) DC2106A-A
130A 1 1× LTM4676 (+ 3× LTM4630) DC2106A-B
100A 1 1× LTM4676A (+ 3× LTM4620A) DC2106B-A
130A 1 1× LTM4676A (+ 3× LTM4630) DC2106B-B

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DEMO MANUAL DC1989B-C
QUICK START PROCEDURE
Figure 2. Proper Measurement Equipment Setup
Figure 3. Measuring Output Voltage Ripple

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dc1989bcf
DEMO MANUAL DC1989B-C
QUICK START PROCEDURE
Figure 4. Demo Setup with PC
Figure 5. Efficiency vs Load Current at VIN = 5V and VIN = 12V
Efficiency vs Load Current
100
90
70
80
60
50
LOAD CURRENT (A)
EFFICIENCY (%)
0
100
90807010 40 50 603020
VIN = 5V
VIN = 12V
VOUT0 = 1V

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dc1989bcf
DEMO MANUAL DC1989B-C
QUICK START PROCEDURE
Figure 8. Thermal Performance at VIN = 12V, VOUT0 = 1V, IOUT0 = 100A, TA= 23.8°C, Air Flow 300LFM
VOUT0 (20MHz BW) [50mV/DIV]
50A TO 100A LOAD STEP
VOUT0 (20MHz BW) [10mV/DIV]
Figure 6. Output Voltage VOUT0 vs Load Current
(VOUT0 RANGE = 1)
Figure 9. Current Sharing at VIN = 12V, VOUT0 = 1V
(Based on the Current Readback)
Figure 7. Output Voltage Ripple at VIN = 12V,
VOUT0 = 1V, IOUT0 = 100A
Figure 10. Total Current Readback vs Load
Current at VIN = 12V, VOUT0 = 1V
0 10 20 30
100
5040 60 9070 80
LOAD CURRENT (A)
PHASE CURRENT (A)
14
12
8
10
6
2
4
0
–2
IOUT_PHASE#1
IOUT_PHASE#2
IOUT_PHASE#3
IOUT_PHASE#4
IOUT_PHASE#5
IOUT_PHASE#6
IOUT_PHASE#7
IOUT_PHASE#8
LOAD CURRENT (A)
0
TOTAL CURRENT READBACK (A)
110
100
90
80
50
40
70
60
30
10
20
010 20 30
100
5040 60 9070 80

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dc1989bcf
DEMO MANUAL DC1989B-C
QUICK START PROCEDURE
LTpowerPlay Software GUI
LTpowerPlay is a powerful Windows based development
environment that supports Linear Technology power sys-
tem management ICs, including the LTM4676A, LTC3880,
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.LTpowerPlayprovidesunprecedenteddiagnostic
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
oneofmanypotentialtargets,includingtheLTM4676A,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
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
LTpowerPlay menu.
LTpowerPlay QUICK START PROCEDURE
Thefollowingprocedure describeshowtouse LTpowerPlay
to monitor and change the settings of LTM4676A.
1. Download and install the LTPowerPlay GUI:
http://linear.com/ltpowerplay
Figure 11. LTpowerPlay Main Interface

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DEMO MANUAL DC1989B-C
QUICK START PROCEDURE
2. Launch the LTpowerPlay GUI.
a. The GUI should automatically identify the DC1989B-C.
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 LTM4676A is
communicating:
c. In the Toolbar, click the “R” (RAM to PC) icon to read the
RAM from the LTM4676A. This reads the configuration
from the RAM of LTM4676A 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 LTM4676A. After finishing this
step, you will see the output voltage will change to 1.5V.
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.

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dc1989bcf
DEMO MANUAL DC1989B-C
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 18 CIN1, CIN2, CIN4-CIN11, CIN12-CIN19 CAP., X5R, 10µF, 35V, 10%, 1210 AVX, 1210DD106KAT2A
2 1 CIN3 CAP., 150µF, 35V, ALUMINUM ELECTR., SUN ELECTRONIC INDUSTRIES
CORPORATION, 35CE150AX
3 12 COUT1, COUT6, COUT7, COUT9, COUT12, COUT17,
COUT18, COUT20, COUT23, COUT27, COUT31,
COUT35
CAP., X5R, 100µF, 6.3V, 20% 1210 AVX, 12106D107KAT2A
4 1 C3 CAP., X7R, 220pF, 16V, 10%, 0603 AVX, 0603YC221KAT2A
5 10 COUT4, COUT5, COUT8, COUT15, COUT38,
COUT34, COUT16, COUT19, COUT28, COUT26
CAP., 330µF, 6.3V, POSCAP, D3L PANASONIC, 6TPF330M9L
6 1 C7 CAP., X7R, 470pF, 25V, 10%, 0603 AVX, 06033C471KAT2A
7 1 C4 CAP., X7R, 6.8nF, 16V, 10%, 0603 AVX, 0603YC682KAT2A
8 1 C32 CAP., X5R, 100nF, 16V, 10%, 0603 AVX, 0603YD104KAT2A
9 1 C70 CAP., X5R, 1µF, 25V, 10%, 0805 AVX, 08053D105KAT2A
10 2 C65, C68 CAP., X5R, 1µF, 25V, 10%, 1206 AVX, 12063D105KAT2A
11 1 C67 CAP., X7R, 0.1µF, 25V, 10%, 1206 AVX, 12063C104KAT2A
12 1 C64 CAP., X5R, 4.7µF, 25V, 10%, 0603 MURATA, GRM188R61E475KE11D
13 1 C66 CAP., X5R, 0.22µF, 25V, 10%, 0805 AVX, 08053D224KAT2A
14 2 D1, D2 LED, 0603 GREEN WURTH ELEKTRONIK 150060GS75000
15 1 D3 LED, 0603 RED WURTH ELEKTRONIK 150060SS75000
16 1 D8 DIODE SCHOTTKY 20V 500MA SOD882 NXP SEMI. PMEG2005AEL
17 1 Q2 MOSFET P-CH 20V 5.9A TO-236 VISHAY SI2365EDS-T1-GE3
18 2 Q3, Q4 MOSFET N-CH 60V 115MA SOT-23 FAIRCHILD 2N7002K
19 2 Q11, Q12 XSTR, N-CH 40V 14A TO-252 VISHAY SUD50N04-8M8P-4GE3
27 1 Q19 P-CHANNEL 30-V MOSFET DIODES INC., DMP3130L-7
28 2 R65, R80 RES., CHIP, 2.43k, 1%, 0603 VISHAY CRCW06032K43FKEA
29 2 R66, R79 RES., CHIP, 3.24k, 1%, 0603 VISHAY CRCW06033K24FKEA
30 1 R20 RES., CHIP, 22.6k, 1%, 0603 VISHAY CRCW060322K6FKEA
31 23 R2, R4, R18, R25, R26, R30, R32, R47, R48, R50,
R56, R58, R60, R72, R74, R104, R119, R120,
R121, R122, R131, R135, R143
RES., CHIP, 0Ω, 1%, 0603 VISHAY CRCW06030000Z0EA
4 R49, R51, R53, R54 RES., CHIP, 0Ω, 1%, 2010Ω VISHAY CRCW20100000Z0EF
32 15 R6, R7, R8, R9, R10, R11, R12, R15, R35, R36,
R39, R64, R78, R116, R130
RES., CHIP, 10k, 1%, 0603 VISHAY CRCW060310K0FKEA
33 1 R14 RES., CHIP, 976Ω, 1%, 0603
34 2 R40, R42 RES., CHIP, 1.65k, 1%, 0603 VISHAY CRCW06031K65FKEA
35 2 R16, R41 RES., CHIP, 10Ω, 1%, 0603 VISHAY CRCW060310R0FKEA
36 1 R112 RES., CHIP, 100Ω, 1%, 0603 VISHAY CRCW0603100RFKEA
37 1 R113 RES., CHIP, 1.4k, 1%, 0603 VISHAY CRCW06031K40FKEA
38 1 R19 RES., CHIP, 787Ω, 1%, 0603 PANASONIC ERJ-3EKF7870V
39 1 R27 RES., CHIP, 51k, 1%, 0603 VISHAY CRCW060351K0FKEA
40 1 R141 RES., CHIP, 15.8k, 1%, 0603 VISHAY CRCW060315K8FKEA
41 2 R134, R144 RES., CHIP, 4.99k, 1%, 0603 VISHAY CRCW06034K99FKEA
42 2 R85, R124 RES., CHIP, 200Ω, 1%, 0603 VISHAY CRCW0603200RFKEA
PARTS LIST

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dc1989bcf
DEMO MANUAL DC1989B-C
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
43 1 R86 RES., CHIP, 127Ω, 1%, 0603 VISHAY CRCW0603127RFKEA
44 1 R123 RES., CHIP, 1M, 1%, 0603 VISHAY CRCW06031M00FKEA
45 1 R105 RES., CHIP, 681k, 1%, 0603 VISHAY CRCW0603681KFKEA
46 1 R106 RES., CHIP, 3.3Ω, 1%, 0603 VISHAY CRCW06033R30FKEA
47 1 R107 RES., CHIP, 82.5Ω, 1%, 0603 VISHAY CRCW060382R5FKEA
48 2 R108, R118 RES., CHIP, 0.01Ω, 1%, 2010Ω VISHAY, WSL2010R0100FEA
49 1 R109 RES., CHIP, 100k, 1%, 0603 VISHAY CRCW0603100KFKEA
50 1 R110 TRIMMING POTENTIOMETER, 5k BOURNS, 3386P-1-502LF
51 2 R111, R115 RES., CHIP, 20k, 1%, 0603 VISHAY CRCW060320K0FKEA
52 1 R114 RES., CHIP, 154k, 1%, 0603 VISHAY CRCW0603154KFKEA
53 1 R117 RES., CHIP, 2Ω, 1%, 0603 VISHAY CRCW06032R00FKEA
54 4 U1, U2, U3, U4 IC, LTM4676AEY LINEAR TECH., LTM4676AEY#PBF
55 1 U9 IC, 24LC025T-I/ST SOT-23 6-LEAD MICROCHIP, 24LC025T-I/ST
56 1 U6 IC., LT1129CS8-5, S8 LINEAR TECH. LT1129CS8-5#PBF
57 1 U7 IC., LTC6992-1, S6-TSOT LINEAR TECH. LTC6992CS6-1#PBF
58 1 U8 IC., LT1803IS5, S5-TSOT LINEAR TECH. LT1803IS5#PBF
Additional Demo Board Circuit Components
1 0 COUT2, COUT3, COUT10, COUT11, COUT21,
COUT22, COUT29, COUT30, C1, C2, C6, C8-C20
CAP., OPTIONAL
2 0 C69 OPT
3 0 D4, D5 OPT SOD323
4 0 R3, R5, R17, R33, R34, R38, R59, R61, R63, R73,
R75, R77, R126, R127, R128, R132, R133, R136,
R137, R139, R140, R142, R1, R13, R29, R37, R57,
R62, R71, R76, R21, R22, R23, R24, R43, R44,
R45, R46, , R67, R68, R69, R70, R81-R84, R102,
R103, R138
RES., OPTIONAL
Hardware: For Demo Board Only
1 23 E2-E24 TESTPOINT, TURRET, 0.062" MILL-MAX, 2308-2-00-80-00-00-07-0
2 2 JP1, JP2 HEADER, 1X3 PIN 0.079 SINGLE ROW SULLIN, NRPN031PAEN-RC
3 2 XJP1, XJP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-KB-G
4 4 J1, J2, J3, J4 STUD, TESTPIN PEM KFH-032-10
5 8 J1, J2, J3, J4 (x2) NUT, BRASS 10-32 ANY #10-32
6 4 J1, J2, J3, J4 RING, LUG #10 KEYSTONE 8205 (#10)
7 4 J1, J2, J3, J4 WASHER, TIN PLATED BRASS ANY #10EXT BZ TN
8 2 J5, J6 JACK, BANANA KEYSTONE 575-4
9 1 J7 CONN HEADER 12POS 2MM STR DL PCB FCI 98414-G06-12ULF
10 1 J12 CONN RECEPT 2MM DUAL R/A 14POS (F) SULLINS, NPPN072FJFN-RC
11 1 J13 HEADER 14POS 2MM R/A GOLD (M) MOLEX, 87760-1416
12 2 J10, J11 CONN, BNC, 5PINS CONNEX, 112404
13 1 J14 HEADER, 4 PINS, SHROUDED HIROSE, DF3A-4P-2DSA
14 2 SW1, SW2 CONNECTOR, SUB MINIATURE SLIDE
SWITCHES
C&K., JS202011CQN
15 4 (STAND-OFF) STAND-OFF, NYLON 0.50" TALL, SNAP ON KEYSTONE, 8833

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dc1989bcf
DEMO MANUAL DC1989B-C
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
1210
0.035 VIA TESTPOINTS
121035V
4.5V - 16V
1210 1210
1210
6.3V 1210 1210
0805
ON
OFF RUN0
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603.
1210 6.3V1210 1210 6.3V
µModule REGULATOR WITH DIGITAL POWER MANAGEMENT
0805
*
WHEN VIN < 5.75V, SHORT INTVCC TO VIN WITH R5,R34,R61,R75.
*
1V / 50A
ALERTB SCL SDA RUN0 SYNC SHARE_CLK GPIO0B
VIN
VOUT0
VIN
VOUT0
VOSNS0+
SHARE_CLK
ALERTB
COMP0
COMP0
SCL SDA
VOSNS0-
GPIO0B
RUN0
VOSNS0+
SYNC
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
JIAN L.PROUCTION1 10-23-15
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
JIAN L.PROUCTION1 10-23-15
__
REVISION HISTORY DESCRIPTION DATEAPPROVEDECO REV
JIAN L.PROUCTION1 10-23-15
__
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
16
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
16
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
16
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
+
COUT4
330uF
R5 OPT
C3
220pF
R25 0
R21 (OPT)
R8 10K
E7
VDD25
R3 OPT
R4 0
COUT2
OPT
R22 (OPT)
CIN4 10uF
R2 0
CIN6 10uF
COUT10
OPT
R26
0
R12 10K
R16 10
R1
OPT
P1
U1
LTM4676AEY
VOUT0
A1
VOUT0
A2
VOUT0
A3
VOUT0
D1
ISNS0b-
E1
ISNS0b+
F1
ISNS1b- G1
ISNS1b+ H1
VOUT1 J1
VOUT1 J2
VOUT1 J3
VOUT1 K1
VOUT0
B1
VOUT0
B2
VOUT0
B3
VOUT0
D2
ISNS0a-
E2
ISNS0a+
F2
ISNS1a- G2
ISNS1a+ H2
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
DNC
E11
VORB0+
D10
VORB0-
E10
GND
L6
GND
K7
GND
K8
GND
K9
DNC
C10
SW1 L10
GND
M4
VINH0
B12 VINH0 B11 VINH0 A12 VINH0 A11
DNC
K10
VINL
F12
GND
M6
DNC
H11
VINH1 H12
VINH1 J11
VINH1 J12
VINH1 K11
VINH0
E12 VINH0
D12 VINH0 D11 VINH0 C12 VINH0 C11
VINL
F11
GND
M7
VINH1 K12
VINH1 L11
VINH1 L12
VINH1 M11
VINH1 M12
SGND
G7
SGND
G8
GND
D7
R24
(OPT)
+
COUT8 330uF
CIN1 10uF 1210
P3
R23
(OPT)
C2 OPT
COUT6 100uF
1210
+
CIN3 150uF
R20 22.6K
R10 10K
R19 787
E2
INTVCC
R13 OPT
E8
GND0_SNS
J1
VIN
R9 10K
R17 OPT
R7 10K
J2
GND
R18
0
P5
P2
R11 10K
C4
6.8nF
C5 10nF
E3
VIN
CIN7 10uF
C1
OPT
R14 976
CIN2 10uF 1210
COUT9
100uF
E4
GND
R15 10K
E6
VOUT0_SNS
SW1
1
2
3
4
5
6
R120 0
+
COUT5
330uF
CIN5 10uF
J3
VOUT0
COUT1 100uF
COUT7 100uF
1210
R6 10K
E5
VDD33
J4
GND
P4
COUT3
OPT
COUT11
OPT
C6 OPT

11
dc1989bcf
DEMO MANUAL DC1989B-C
SCHEMATIC DIAGRAM
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
OPTIONAL JUMPER FOR SINGLE OUTPUT CONFIGURATION
ON OFF
RUN1
1210
0.035 VIA TESTPOINTS
1210 1210 1210
1210
6.3V 1210 1210
0805
0805
1210 6.3V1210 1210
OPT
OPT 6.3V
µModule REGULATOR WITH DIGITAL POWER MANAGEMENT
GPIO1B RUN1 SHARE_CLK ALERTB SCL SDA GPIO0B SYNC
VOSNS1
VIN
VOUT0
VIN
VOUT1
VOUT0 VOUT1
VOSNS0+ VOSNS0-
SHARE_CLK
ALERTB
COMP0
COMP1
SCL SDA GPIO0B
RUN0
GPIO1B
RUN1
SYNC
RUN0RUN1
GPIO0B GPIO1B
COMP0 COMP1
VOSNS0+ VOSNS1
VOSNS0-
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
26
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
26
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
26
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
P10
COUT14
OPT
SW2
1
2
3
4
5
6
C9 OPT
COUT20
100uF
R47 0
R32 0
R30 0
R42 1.65K
C11 OPT
CIN10 10uF
R50 0
COUT13
OPT
R46
(OPT)
R39 10K
J6
GND
C7
R35 10K
E9
VOUT1_SNS
+
COUT19 330uF
R54 0 2010
R45
(OPT)
R27
R38 OPT
R53 0 2010
R28 OPT
R51 0 2010
E10
GND1_SNS
R119 0
CIN11 10uF
COUT17 100uF
1210
R34 OPT
R31 OPT
P9
COUT22
OPT
C10 OPT
R56 0
P7
R43 (OPT)
J5 VOUT1
+
COUT16
330uF
R40 1.65k
R33 OPT
R41 10
CIN8 10uF
C8
OPT
R29
OPT
C12 10nF
R44 (OPT)
R36 10K
P8
COUT18 100uF
1210
COUT21
OPT
+
COUT15
330uF
R49 0 2010
P6
COUT12 100uF
R37
OPT
R48 0
U2
LTM4676AEY
VOUT0
A1
VOUT0
A2
VOUT0
A3
VOUT0
D1
ISNS0b-
E1
ISNS0b+
F1
ISNS1b- G1
ISNS1b+ H1
VOUT1 J1
VOUT1 J2
VOUT1 J3
VOUT1 K1
VOUT0
B1
VOUT0
B2
VOUT0
B3
VOUT0
D2
ISNS0a-
E2
ISNS0a+
F2
ISNS1a- G2
ISNS1a+ H2
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
DNC
E11
VORB0+
D10
VORB0-
E10
GND
L6
GND
K7
GND
K8
GND
K9
DNC
C10
SW1 L10
GND
M4
VINH0
B12 VINH0 B11 VINH0 A12 VINH0 A11
DNC
K10
VINL
F12
GND
M6
DNC
H11
VINH1 H12
VINH1 J11
VINH1 J12
VINH1 K11
VINH0
E12 VINH0
D12 VINH0 D11 VINH0 C12 VINH0 C11
VINL
F11
GND
M7
VINH1 K12
VINH1 L11
VINH1 L12
VINH1 M11
VINH1 M12
SGND
G7
SGND
G8
GND
D7
CIN9 10uF
P11

12
dc1989bcf
DEMO MANUAL DC1989B-C
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
1210
0.035 VIA TESTPOINTS
1210 1210 1210
1210 1210 1210
0805
0805
1210 1210 1210
µModule REGULATOR WITH DIGITAL POWER MANAGEMENT
SHARE_CLK ALERTB SCL SDA SYNC GPIO0B
VIN
VOUT0
VIN
VOUT0
VOSNS0+
VOSNS0+
VOSNS0-
SHARE_CLK
ALERTB
COMP0
COMP0
SCL SDA GPIO0B
RUN0
SYNC
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
36
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
36
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
36
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
CIN12 10uF
+
COUT26
330uF
COUT27
100uF
R69
(OPT)
COUT24 OPT
P17
C13
OPT
C14 OPT
C15 OPT
+
COUT28 330uF
R61 OPT
R121 0
R59 OPT
R66 3.24K
R67 (OPT)
CIN13 10uF
P14
P15
R57
OPT
R68 (OPT)
U3
LTM4676AEY
VOUT0
A1
VOUT0
A2
VOUT0
A3
VOUT0
D1
ISNS0b-
E1
ISNS0b+
F1
ISNS1b- G1
ISNS1b+ H1
VOUT1 J1
VOUT1 J2
VOUT1 J3
VOUT1 K1
VOUT0
B1
VOUT0
B2
VOUT0
B3
VOUT0
D2
ISNS0a-
E2
ISNS0a+
F2
ISNS1a- G2
ISNS1a+ H2
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
DNC
E11
VORB0+
D10
VORB0-
E10
GND
L6
GND
K7
GND
K8
GND
K9
DNC
C10
SW1 L10
GND
M4
VINH0
B12 VINH0 B11 VINH0 A12 VINH0 A11
DNC
K10
VINL
F12
GND
M6
DNC
H11
VINH1 H12
VINH1 J11
VINH1 J12
VINH1 K11
VINH0
E12 VINH0
D12 VINH0 D11 VINH0 C12 VINH0 C11
VINL
F11
GND
M7
VINH1 K12
VINH1 L11
VINH1 L12
VINH1 M11
VINH1 M12
SGND
G7
SGND
G8
GND
D7
P13
R63 OPT
R62 OPT
CIN14 10uF
P16
P12
R60 0
R70
(OPT)
COUT23
100uF
COUT29
OPT
COUT30
OPT
C16 OPT
CIN15 10uF
COUT25
OPT
P18
R64 10K
R65 2.43K
R58 0

13
dc1989bcf
DEMO MANUAL DC1989B-C
SCHEMATIC DIAGRAM
5 5
4 4
3 3
2 2
1 1
D D C C B B A A
1210
0.035 VIA TESTPOINTS
1210 1210 1210
1210 1210 1210
0805
0805
1210 1210 1210
µModule REGULATOR WITH DIGITAL POWER MANAGEMENT
SHARE_CLK ALERTB SCL SDA SYNC GPIO0B
VIN
VOUT0
VIN
VOUT0
VOSNS0+
VOSNS0+ VOSNS0-
SHARE_CLK
ALERTB
COMP0
COMP0
SCL SDA GPIO0B
RUN0
SYNC
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
46
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
46
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
46
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
C19 OPT
R81 (OPT)
R73 OPT
R75 OPT
+
COUT38 330uF
U4
LTM4676AEY
VOUT0
A1
VOUT0
A2
VOUT0
A3
VOUT0
D1
ISNS0b-
E1
ISNS0b+
F1
ISNS1b- G1
ISNS1b+ H1
VOUT1 J1
VOUT1 J2
VOUT1 J3
VOUT1 K1
VOUT0
B1
VOUT0
B2
VOUT0
B3
VOUT0
D2
ISNS0a-
E2
ISNS0a+
F2
ISNS1a- G2
ISNS1a+ H2
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
DNC
E11
VORB0+
D10
VORB0-
E10
GND
L6
GND
K7
GND
K8
GND
K9
DNC
C10
SW1 L10
GND
M4
VINH0
B12 VINH0 B11 VINH0 A12 VINH0 A11
DNC
K10
VINL
F12
GND
M6
DNC
H11
VINH1 H12
VINH1 J11
VINH1 J12
VINH1 K11
VINH0
E12 VINH0
D12 VINH0 D11 VINH0 C12 VINH0 C11
VINL
F11
GND
M7
VINH1 K12
VINH1 L11
VINH1 L12
VINH1 M11
VINH1 M12
SGND
G7
SGND
G8
GND
D7
R71
OPT C18
OPT
CIN16 10uF
P25
P21
R82 (OPT)
P20
R77 OPT
CIN17 10uF
P19
R76
OPT
P23
R74 0
R84
(OPT)
COUT31 100uF
COUT36
OPT
COUT37
OPT
CIN18 10uF
COUT33
OPT
C20 OPT
R79 2.24K
R72 0
P24
R78 10K
P22
CIN19 10uF
+
COUT34
330uF
R83
(OPT)
COUT35
100uF
COUT32 OPT
R122 0
C17
OPT
R80 2.43K

14
dc1989bcf
DEMO MANUAL DC1989B-C
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D C C B B A A
µModule REGULATOR WITH DIGITAL POWER MANAGEMENT
GPIO0 GPIO1
ALERTB
J1, MALE, CONN HEADER 14POS 2MM R/A GOLD, Molex Connector Corp. 87760-1416 J2, FEMALE, CONN RECEPT 2MM DUAL R/A 14POS, Sullins Conn. NPPN072FJFN-RC
TO DC1613A
PSM STACKING CONNECTORS:
OPTIONAL CIRCUIT FOR PROGRAMMING WITHOUT VIN
1206
TO DC2086A
ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN
AUXVCC
EEWP
EESDA EESCL
AUX3V4
3V3 3V3 3V3
3V3
VIN
3V3 VDD33
VIN
3V3
GPIO0B GPIO1B
ALERTB
VDD33
ALERTB SDA SCL
RUN0 RUN1
GPIO1B GPIO0B
SYNC
SHARE_CLK
VDD33
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
56
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
56
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
56
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
J7
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
R142 OPT
E16
SYNC
R135 0
Q2
TP0101K
23
1
D4 OPT
E22
SGND
R136 OPT
D1
GREEN
E12
ALERTB
R143 0
E15
SHARE_CLK
Q3
2N7002A
2 3
1
R13010K
R137 OPT
C32
100nF
E11
GPIO1B
R138 OPT
R144 4.99K
R85 200
E21
RUN1
R139 OPT
D2 GREEN
J12 DEMO 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
E18
GPIO0B
Q19
DMP3130L-7
23
1
J13 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
E13
SDA
R126 OPT
R140 OPT
D3 RED
E19
RUN0
J14
AUX3V4 4
SCL 3
GND 2
1
SDA
R127 OPT
D5 OPT
U9
24LC025-I/ST
A0
1
A1
2
A2
3
VSS
4SDA 5
SCL 6
WP 7
VCC 8
E14
SCL
E25
AUXP
R86 127
R131
0
D8
21
R128 OPT
R132 OPT
R141 15.8k
R133 OPT
R124 200
Q4
2N7002A
2 3
1
R134 4.99K
E17
SGND

15
dc1989bcf
DEMO MANUAL DC1989B-C
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
ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN
OPT
2010 2010 OPT
DYNAMIC LOAD CIRCUIT
BLEEDER LOADS
µModule REGULATOR WITH DIGITAL POWER MANAGEMENT
ON
OFF
70Hz, 3% Duty Cycle
INT EXT
1% 1%
0805
IOUT TST VOUT0
PULSE
BIAS
VOUT0 VOUT1
VIN
VOUT0
+5V
+5V
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
66
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
66
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
SIZE DATE:
IC NO. REV.
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
Tuesday, March 22, 2016
66
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676AEY DEMO CIRCUIT 1989B-C
R110
5K
U8 LT1803IS5
VOUT 1
V-
2
+IN
3-IN 4
V+
5
J11
1
2
3
4
5
C69 OPT
E23
EXT PULSE
R107 82.5
U7 LTC6992-1 MOD
1
GND
2
SET
3DIV 4
V+ 5
OUT 6
R103
U6
LT1129CS8-5
OUTPUT 1
SENSE/ADJ 2
GND 3
NC 4
SHDN
5
GND
6
GND
7
VIN
8
Q11
SUD50N03-10CP-E3
1
2 3
R108 0.01
R114 154K
R118 0.01
C68 1uF
J10
1
2
3
4
5
R115 20K
R109 100K
R111 20K
JP2
1
2
3
R112 100
R104 0
R123 1000K
C70
1uF
R113 1.4K
R105 681K
R116 10K
E24
GND
C65 1uF
Q12
SUD50N03-10CP-E3
1
2 3
JP1
1
2
3
C67
0.1uF
R106 3.3
R102
C64 4.7uF
C66
0.22uF
R117 2

16
dc1989bcf
DEMO MANUAL DC1989B-C
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2016
LT 0916 • 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 LT C 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 LT C 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. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LT C 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 LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation