2
dc1989abf
DEMO MANUAL DC1989A-B
Quick start proceDure
Demonstration circuit 1989A-B is easy to set up to evalu-
ate 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 to 16V) 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 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 DC1989A-B
You can use a PC to reconfigure the power management
features of the LTM4676 such as: nominal VOUT, margin
set points, OV/UV limits, temperature fault limits, 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 16V
Output Voltage, VOUT0 VIN = 4.5 to 16V, IOUT0 = 0A to 75A 0.5V to 4V, Default: 1V
Maximum Output Current, IOUT0 VIN = 4.5 to 16V, VOUT = 0.5V to 4V 75A
Typical Efficiency VIN = 12V, VOUT = 1V, IOUT = 75A 80%
Default Switching Frequency 350kHz
Table 1. LTM4676 Demo Cards for Up to 130A 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
26A 1 1 DC2087A
50A 1 2 DC1989A-B
75A 1 3 DC1989A-B
100A 1 4 DC1989A-C
100A 1 1 (+ 3x LTM4620A) DC2106A-A
130A 1 1 (+ 3x LTM4630) DC2106A-B
3
dc1989abf
DEMO MANUAL DC1989A-B
Quick start proceDure
Figure 2. Proper Measurement Equipment Setup
Figure 3. Measuring Output Voltage Ripple
4
dc1989abf
DEMO MANUAL DC1989A-B
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
75
5 15 45 55 653525
VIN = 5V
VIN = 12V
VOUT0 = 1V
5
dc1989abf
DEMO MANUAL DC1989A-B
Quick start proceDure
Figure 8. Thermal Performance at VIN = 12V, VOUT0 = 1V, IOUT0 = 75A, TA = 23.8°C, Air Flow 200LFM
VOUT0 (20MHz BW) [50mV/DIV]
37.5A TO 75A LOAD STEP
VOUT0 (20MHz BW) [10mV/DIV]
Figure 6. Output Voltage VOUT0 vs Load Current
(VOUT0 RANGE = 0)
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 = 75A
Figure 10. Total Current Readback vs Load
Current at VIN = 12V, VOUT0 = 1V
0 10 20 30
75
50405 15 25 45 60 65 705535
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
LOAD CURRENT (A)
0
TOTAL CURRENT READBACK (A)
80
50
40
70
60
30
10
20
010 20 30
75
50405 15 25 45 60 65 705535
6
dc1989abf
DEMO MANUAL DC1989A-B
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 LTM4676, 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
later time. LTpowerPlay provides unprecedented diagnostic
and debug features. It becomes a valuable diagnostic tool
during board bring-up to program or tweak the power
management scheme in a system, or to diagnose power
issues when bringing up rails. LTpowerPlay utilizes the
DC1613A USB-to-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
7
dc1989abf
DEMO MANUAL DC1989A-B
Quick start proceDure
2. Launch the LTpowerPlay GUI.
a. The GUI should automatically identify the DC1989A-B.
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.
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.
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.
8
dc1989abf
DEMO MANUAL DC1989A-B
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 14 CIN1, CIN2, CIN4-CIN15 CAP., X5R, 10µF, 35V, 10%, 1210 AVX, 1210DD106KAT2A
2 1 CIN3 CAP., 150µF, 35V, ALUMINUM ELECTR., SUN ELECT., 35CE150AX
3 10 COUT1, COUT6, COUT7, COUT9, COUT12, COUT17,
COUT18, COUT20, COUT23, COUT27
CAP., X5R, 100µF, 6.3V, 20% 1210 AVX, 12106D107KAT2A
4 1 C3 CAP., X5R, 220pF, 16V, 10%, 0603 AVX, 0603YD221KAT2A
5 8 COUT4, COUT5, COUT8, COUT15, COUT16,
COUT19, COUT26, COUT28
CAP., 330µF, 6.3V, POSCAP, D3L SANYO, 6TPF330M9L
6 1 C7 CAP., X7R, 470pF, 16V, 10%, 0603 AVX, 0603YC471KAT2A
7 1 C4 CAP., X7R, 3.3nF, 16V, 10%, 0603 (3300pF) AVX, 0603YC332KAT2A
8 2 C5, C12 CAP., X5R, 10nF, 16V, 10%, 0603 (0.01µF) AVX, 0603YD103KAT2A
9 1 C21 CAP., X5R, 100nF, 16V, 10%, 0603 (0.1µF) AVX, 0603YD104KAT2A
10 1 C70 CAP., X5R, 1µF, 25V, 10%, 0805 AVX, 08053D105KAT2A
11 2 C65, C68 CAP., X5R, 1µF, 25V, 10%, 1206 AVX, 12063D105KAT2A
12 1 C67 CAP., X7R, 0.1µF, 25V, 10%, 1206 AVX, 12063C104KAT2A
13 1 C64 CAP., X5R, 4.7µF, 25V, 10%, 0603 MURATA, GRM188R61E475KE11
14 1 C66 CAP., X5R, 0.22µF, 25V, 10%, 0805 AVX, 08053D224KAT2A
15 1 C69 CAP., X7R, 150pF, 25V, 10%, 0603 AVX, 06033C151KAT2A
16 2 D1, D2 LED GREEN S-GW TYPE SMD PANASONIC LN1371SGTRP
17 1 D3 LED RED S-TYPE GULL WING SMD PANASONIC LN1271RTR
18 1 J7 CONN HEADER 12POS 2MM STR DL PCB FCI 98414-G06-12ULF
19 1 J8 PIN HEADER 20 DUAL ROW RA (M) Mill Max 802-40-020-20-0001
20 1 J9 CONN SOCKET 20 DUAL ROW RA (F) Mill Max 803-43-020-20-001
21 2 J10, J11 CONN, BNC, 5 PINS CONNEX, 112404
22 1 Q1 MOSFET P-CH 20V 0.58A SOT-23 VISHAY TP0101K-T1-E3
23 2 Q2, Q3 MOSFET N-CH 60V 115mA SOT-23 FAIRCHILD 2N7002K
24 2 Q11, Q12 N-CHANNEL 30-V MOSFET, TO-252 VISHAY, SUD50N03-09P-E3
25 1 R20 RES., CHIP, 22.6k, 1%, 0603 VISHAY CRCW060322K6FKEA
26 25 R2, R4, R18, R25, R26, R120-R122, R30, R32, R47,
R48, R50, R56, R58, R60, R72, R74, R85, R86,
R89, R90, R92, R104, R119
RES., CHIP, 0Ω, 1%, 0603 VISHAY CRCW06030000Z0EA
27 4 R49, R51, R53, R54 RES., CHIP, 0Ω, 1%, 2010 VISHAY CRCW20100000Z0EA
28 16 R6, R7, R8, R9, R10, R11, R12, R15, R35, R36,
R39, R64, R78, R97, R98, R116
RES., CHIP, 10k, 1%, 0603 VISHAY CRCW060310K0FKEA
29 1 R27 RES., CHIP, 51k, 1%, 0603 VISHAY CRCW060351K0FKEA
30 1 R14 RES., CHIP, 2k, 1%, 0603 VISHAY CRCW06032K0FKEA
31 2 R16, R41 RES., CHIP, 10Ω, 1%, 0603 VISHAY CRCW060310R0FKEA
32 1 R112 RES., CHIP, 100Ω, 1%, 0603 VISHAY CRCW0603100RFKEA
33 1 R113 RES., CHIP, 1.4k, 1%, 0603 VISHAY CRCW06031K40FKEA
34 1 R19 RES., CHIP, 787Ω, 1%, 0603 VISHAY CRCW0603787RFKEA
35 1 R40 RES., CHIP, 1.65k, 1%, 0603 VISHAY CRCW06031K65FKEA
36 1 R42 RES., CHIP, 3.24k, 1%, 0603 VISHAY CRCW06033K24FKEA
37 1 R65 RES., CHIP, 2.43k, 1%, 0603 VISHAY CRCW06032K43FKEA
38 1 R66 RES., CHIP, 2.43k, 1%, 0603 VISHAY CRCW06032K43FKEA
9
dc1989abf
DEMO MANUAL DC1989A-B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
39 2 R95, R96 RES., CHIP, 4.99k, 1%, 0603 VISHAY CRCW06034K99FKEA
40 2 R99, R100 RES., CHIP, 200Ω, 1%, 0603 VISHAY CRCW0603200RFKEA
41 1 R101 RES., CHIP, 127Ω, 1%, 0603 VISHAY CRCW0603127RFKEA
42 1 R123 RES., CHIP, 1M, 1%, 0603 VISHAY CRCW06031M00FKEA
43 1 R105 RES., CHIP, 681k, 1%, 0603 VISHAY CRCW0603681KFKEA
44 1 R106 RES., CHIP, 3.3Ω, 1%, 0603 VISHAY CRCW06033R30FKEA
45 1 R107 RES., CHIP, 82.5Ω, 1%, 0603 VISHAY CRCW060382R5FKEA
46 2 R108, R118 RES., CHIP, 0.01Ω, 1%, 2010 VISHAY, WSL2010R0100FEA
47 1 R109 RES., CHIP, 100k, 1%, 0603 VISHAY CRCW0603100KFKEA
48 1 R110 TRIMMING POTENTIOMETER, 5k BOURNS, 3386P-1-502LF
49 2 R111, R115 RES., CHIP, 20k, 1%, 0603 VISHAY CRCW060320K0FKEA
50 1 R114 RES., CHIP, 154k, 1%, 0603 VISHAY CRCW0603154KFKEA
51 1 R117 RES., CHIP, 2Ω, 1%, 0603 VISHAY CRCW06032R00FKEA
52 2 SW1, SW2 CONNECTOR, SUB MINIATURE SLIDE
SWITCHES
C&K., JS202011CQN
53 3 U1, U2, U3 IC, LTM4676EY LINEAR TECH. LTM4676EY
54 1 U5 IC, 24LC025T-E/OT SOT-23 6-LEAD MICROCHIP, 24LC025T-E/OT
55 1 U6 IC., LT1129CS8-5, S8 LINEAR TECH. LT1129CS8-5
56 1 U7 IC., LTC6992-1, S6-TSOT LINEAR TECH. LTC6992CS6-1
57 1 U8 IC., LT1803IS5, S5-TSOT LINEAR TECH. LT1803IS5
Additional Demo Board Circuit Components
1 0 CIN16-CIN19 (OPT) CAP., OPTIONAL
2 0 C1, COUT2, C2, COUT3 (OPT), C6, C8, C9, COUT10,
C10, COUT11, C11, COUT13, C13, C14, C15, C16,
C17, C18, C19, C20, COUT14, COUT24, COUT21,
COUT22, COUT25, COUT27, COUT29, COUT30,
COUT31, COUT32, COUT35, COUT33, COUT36,
COUT37, COUT38, COUT34
CAP., OPTIONAL
3 0 R1, R3, R5, R17, R34, R31, R33, R29(OPT), R38,
R52, R55, R57, R59, R61, R28, R63, R71, R73,
R75, R77, R88, R91, R93, R94, R102, R103, R13,
R37, R62, R76, R79, R80, R21, R22, R23, R24,
R43, R44, R45, R46, R67, R68, R69, R70, R81,
R82, R68, R69, R70, R81, R82, R83, R84, R87
RES., OPTIONAL
4 0 U4 (OPT) 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 6 J1, J2, J3, J4, J5, J6 STUD, TESTPIN PEM KFH-032-10
5 12 J1, J2, J3, J4, J5, J6 (x2) NUT, BRASS 10-32 ANY #10-32
6 6 J1, J2, J3, J4, J5, J6 RING, LUG #10 KEYSTONE #10
7 6 J1, J2, J3, J4, J5, J6 WASHER, TIN PLATED BRASS 10EXT
8 4 (STAND-OFF) STAND-OFF, NYLON 0.50" TALL KEYSTONE, 8833(SNAP ON)
9 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT TOP 1989A
parts List
10
dc1989abf
DEMO MANUAL DC1989A-B
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.
*
1V / 75A
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.PROUCTION2 12-10-12
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
JIAN L.PROUCTION2 12-10-12
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
JIAN L.PROUCTION2 12-10-12
__
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Tuesday, May 28, 2013
16
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Tuesday, May 28, 2013
16
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Tuesday, May 28, 2013
16
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
+
COUT4
330uF
+
COUT4
330uF
R5 OPTR5 OPT
C3
220pF
C3
220pF
R25 0R25 0
R21 (OPT)R21 (OPT)
R8
10K
R8
10K
E7
VDD25
E7
VDD25
R3
OPT
R3
OPT
R4 0R4 0
COUT2
OPT
COUT2
OPT
R22 (OPT)
R22 (OPT)
CIN4
10uF
CIN4
10uF
R2
0
R2
0
CIN6
10uF
CIN6
10uF
COUT10
OPT
COUT10
OPT
R26
0
R26
0
R12
10K
R12
10K
R16
10
R16
10
R1
OPT
R1
OPT
P1P1
R24
(OPT)
R24
(OPT)
+
COUT8
330uF
+
COUT8
330uF
CIN1
10uF
1210
CIN1
10uF
1210
P3P3
R23
(OPT)
R23
(OPT)
C2
OPT
C2
OPT
COUT6
100uF
1210
COUT6
100uF
1210
U1
LTM4676EY
U1
LTM4676EY
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
+
CIN3
150uF
+
CIN3
150uF
R20 22.6KR20 22.6K
R10
10K
R10
10K
R19 787R19 787
E2
INTVCC
E2
INTVCC
R13
OPT
R13
OPT
E8
GND0_SNS
E8
GND0_SNS
J1
VIN
J1
VIN
R9
10K
R9
10K
R17 OPTR17 OPT
R7
10K
R7
10K
J2
GND
J2
GND
R18
0
R18
0
P5P5
P2P2
R11
10K
R11
10K
C4
3.3nF
C4
3.3nF
C5
10nF
C5
10nF
E3
VIN
E3
VIN
CIN7
10uF
CIN7
10uF
C1
OPT
C1
OPT
R14
2K
R14
2K
CIN2
10uF
1210
CIN2
10uF
1210
COUT9
100uF
COUT9
100uF
E4
GND
E4
GND
R15
10K
R15
10K
E6
VOUT0_SNS E6
VOUT0_SNS
SW1SW1
1
2
3
4
5
6
R120 0R120 0
+
COUT5
330uF
+
COUT5
330uF
CIN5
10uF
CIN5
10uF
J3
VOUT0 J3
VOUT0
COUT1
100uF
COUT1
100uF
COUT7
100uF
1210
COUT7
100uF
1210
R6
10K
R6
10K
E5
VDD33
E5
VDD33
J4
GND
J4
GND
P4P4
COUT3
OPT
COUT3
OPT
COUT11
OPT
COUT11
OPT
C6
OPT
C6
OPT
11
dc1989abf
DEMO MANUAL DC1989A-B
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-
A0_EEPROM
A1_EEPROM
VCC
VCC
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: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Tuesday, May 28, 2013
26
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Tuesday, May 28, 2013
26
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Tuesday, May 28, 2013
26
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
P10P10
COUT14
OPT
COUT14
OPT
SW2SW2
1
2
3
4
5
6
R52 OPTR52 OPT
C9
OPT
C9
OPT
COUT20
100uF
COUT20
100uF
R47 0R47 0
R32 0R32 0
R30
0
R30
0
R42 3.24KR42 3.24K
C11
OPT
C11
OPT
CIN10
10uF
CIN10
10uF
R50 0R50 0
COUT13
OPT
COUT13
OPT
R46
(OPT)
R46
(OPT)
R39
10K
R39
10K
J6
GND
J6
GND
C7C7
R35
10K
R35
10K
E9
VOUT1_SNS
E9
VOUT1_SNS
+
COUT19
330uF
+
COUT19
330uF
R54 0 2010R54 0 2010
R45
(OPT)
R45
(OPT)
R27R27
R38 OPTR38 OPT
R53 0 2010R53 0 2010
R55 OPTR55 OPT
R28
OPT
R28
OPT
R51 0 2010R51 0 2010
E10
GND1_SNS
E10
GND1_SNS
R119 0
R119 0
CIN11
10uF
CIN11
10uF
COUT17
100uF
1210
COUT17
100uF
1210
R34 OPTR34 OPT
R31
OPT
R31
OPT
P9P9
COUT22
OPT
COUT22
OPT
C10
OPT
C10
OPT
R56 0R56 0
P7P7
R43 (OPT)R43 (OPT)
J5 VOUT1
J5 VOUT1
+
COUT16
330uF
+
COUT16
330uF
R40 1.65kR40 1.65k
R33 OPTR33 OPT
R41
10
R41
10
CIN8
10uF
CIN8
10uF
C8
OPT
C8
OPT
R29
OPT
R29
OPT
C12
10nF
C12
10nF
R44 (OPT)
R44 (OPT)
R36
10K
R36
10K
P8P8
COUT18
100uF
1210
COUT18
100uF
1210
COUT21
OPT
COUT21
OPT
+
COUT15
330uF
+
COUT15
330uF
R49 0 2010R49 0 2010
U2
LTM4676EY
U2
LTM4676EY
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
P6P6
COUT12
100uF
COUT12
100uF
R37
OPT
R37
OPT
R48 0R48 0
CIN9
10uF
CIN9
10uF
P11P11
12
dc1989abf
DEMO MANUAL DC1989A-B
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
12106.3V 1210 1210
0805
0805
1210 6.3V
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: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Tuesday, May 28, 2013
36
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Tuesday, May 28, 2013
36
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Tuesday, May 28, 2013
36
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
CIN12
10uF
CIN12
10uF
+
COUT26
330uF
+
COUT26
330uF
COUT27
100uF
COUT27
100uF
R69
(OPT)
R69
(OPT)
COUT24
OPT
COUT24
OPT
P17P17
C13
OPT
C13
OPT
C14
OPT
C14
OPT
C15
OPT
C15
OPT
+
COUT28
330uF
+
COUT28
330uF
R61 OPTR61 OPT
R121 0R121 0
R59
OPT
R59
OPT
R66 2.43KR66 2.43K
R67 (OPT)R67 (OPT)
CIN13
10uF
CIN13
10uF
P14P14
P15P15
R57
OPT
R57
OPT
R68 (OPT)
R68 (OPT)
U3
LTM4676EY
U3
LTM4676EY
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
P13P13
R63 OPTR63 OPT
R62
OPT
R62
OPT
CIN14
10uF
CIN14
10uF
P16P16
P12P12
R60 0R60 0
R70
(OPT)
R70
(OPT)
COUT23
100uF
COUT23
100uF
COUT29
OPT
COUT29
OPT
COUT30
OPT
COUT30
OPT
C16
OPT
C16
OPT
CIN15
10uF
CIN15
10uF
COUT25
OPT
COUT25
OPT
P18P18
R64
10K
R64
10K
R65 2.43kR65 2.43k
R58
0
R58
0
13
dc1989abf
DEMO MANUAL DC1989A-B
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
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: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Monday, April 01, 2013
46
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Monday, April 01, 2013
46
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Monday, April 01, 2013
46
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
C19
OPT
C19
OPT
R81 OPTR81 OPT
R73
OPT
R73
OPT
R75 OPTR75 OPT
+
COUT38
OPT
+
COUT38
OPT
R71
OPT
R71
OPT C18
OPT
C18
OPT
CIN16
OPT
CIN16
OPT
P25P25
P21P21
R82 OPTR82 OPT
P20P20
R77 OPTR77 OPT
CIN17
OPT
CIN17
OPT
P19P19
R76
OPT
R76
OPT
P23P23
R74 0R74 0
R84
OPT
R84
OPT
COUT31
OPT
COUT31
OPT
COUT36
OPT
COUT36
OPT
COUT37
OPT
COUT37
OPT
CIN18
OPT
CIN18
OPT
COUT33
OPT
COUT33
OPT
C20
OPT
C20
OPT
R79 OPTR79 OPT
R72
0
R72
0
P24P24
R78
10K
R78
10K
P22P22
CIN19
OPT
CIN19
OPT
+
COUT34
OPT
+
COUT34
OPT
R83
OPT
R83
OPT
COUT35
OPT
COUT35
OPT
COUT32
OPT
COUT32
OPT
R122 0R122 0
U4
OPT
U4
OPT
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
C17
OPT
C17
OPT
R80 OPTR80 OPT
14
dc1989abf
DEMO MANUAL DC1989A-B
schematic Diagram
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
GPIO0 GPIO1
ALERTB
TO DC1613A
ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN
µModule REGULATOR WITH DIGITAL POWER MANAGEMENT
FAULT1
FAULT3
SYNC_C
FAULT2
VCC
3V3 3V3 3V3
3V3
3V3
GPIO0B GPIO1B
ALERTB
ALERTB SDA SCL
RUN0
RUN1
SHARE_CLK
GPIO1B
GPIO0B
SYNC
A0_EEPROM
A1_EEPROM
VCC
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Wednesday, January 02, 2013
56
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Wednesday, January 02, 2013
56
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Wednesday, January 02, 2013
56
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
R92 0R92 0
Q2
2N7002A
Q2
2N7002A
2 3
1
E20
AUXP
E20
AUXP
R93 OPTR93 OPT
R90
0
R90
0
D1
GREEN
D1
GREEN
E15
SHARE_CLK
E15
SHARE_CLK
R94 OPTR94 OPT
R100
200
R100
200
R88
OPT
R88
OPT
E11
GPIO1B
E11
GPIO1B
R97
10K
R97
10K
E18
GPIO0B
E18
GPIO0B
D3 RED
D3 RED
R86 0R86 0
R85 0R85 0
D2 GREEN
D2 GREEN
E22
SGND
E22
SGND
U5
24LC025-I/ST
U5
24LC025-I/ST
SCL 1
VSS 2
SDA 3
A1
4
A0
5
VCC
6
E21
RUN1
E21
RUN1
E19
RUN0
E19
RUN0
R98
10K
R98
10K
R101
127
R101
127
R91
OPT
R91
OPT
J9
DEMO HEADER (F)
J9
DEMO HEADER (F)
+3.3V
1
VIN_SNS
2
GND
3
VIN_EN
4
SCL
5
ALERTB
6
SDA
7
CONTROL0
8
SPARE1
9
SPARE2
10
WDI/RESETB
11
CONTROL1
12
SPARE3
13
SHARE_CLK
14
FAULT4
15
FAULT2
16
FAULT3
17
FAULT1
18
SPARE4
19
GND
20
E13
SDA
E13
SDA
R95
4.99K
R95
4.99K
Q3
2N7002A
Q3
2N7002A
2 3
1
E14
SCL
E14
SCL
J7J7
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
E16
SYNC
E16
SYNC
R96
4.99K
R96
4.99K
E17
SGND
E17
SGND
J8
DEMO HEADER (M)
J8
DEMO HEADER (M)
+3.3V 1
VIN_SNS 2
GND 3
VIN_EN 4
SCL 5
ALERTB 6
SDA 7
CONTROL0 8
SPARE1 9
SPARE2 10
WDI/RESETB 11
CONTROL1 12
SPARE3 13
SHARE_CLK 14
FAULT4 15
FAULT2 16
FAULT3 17
FAULT1 18
SPARE4 19
GND 20
R99
200
R99
200
R87
OPT.
R87
OPT.
E12
ALERTB
E12
ALERTB
C21
100nF
C21
100nF
R89 0R89 0
Q1
TP0101K
Q1
TP0101K
23
1
15
dc1989abf
DEMO MANUAL DC1989A-B
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
Figure 7. Circuit Schematic
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: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Friday, March 15, 2013
66
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Friday, March 15, 2013
66
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
SIZE
DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
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
2
Friday, March 15, 2013
66
HIGH EFFICIENCY, POLY-PHASE, DC/DC STEP-DOWN
HZ
JIAN L.
B
LTM4676EY
DEMO CIRCUIT 1989A-B
U7 LTC6992-1U7 LTC6992-1
MOD
1
GND
2
SET
3DIV 4
V+ 5
OUT 6
R107 82.5R107 82.5
R109
100K
R109
100K
R104 0R104 0
JP1JP1
1
2
3
C68
1uF
C68
1uF
R115
20K
R115
20K
C70
1uF
C70
1uF
R106 3.3R106 3.3
U6
LT1129CS8-5
U6
LT1129CS8-5
OUTPUT 1
SENSE/ADJ 2
GND 3
NC 4
SHDN
5
GND
6
GND
7
VIN
8
R118
0.01
R118
0.01
U8 LT1803IS5U8 LT1803IS5
VOUT 1
V-
2
+IN
3-IN 4
V+
5
Q11
SUD50N03-10CP-E3
Q11
SUD50N03-10CP-E3
1
2 3
J10J10
1
2
3
4
5
R113
1.4K
R113
1.4K
R110
5K
R110
5K
R111
20K
R111
20K
Q12
SUD50N03-10CP-E3
Q12
SUD50N03-10CP-E3
1
2 3
R116
10K
R116
10K
R102R102
C64
4.7uF
C64
4.7uF
J11J11
1
2
3
4
5
C69
150pF
C69
150pF
R123 1000KR123 1000K
R105
681K
R105
681K
C65
1uF
C65
1uF
R114 0R114 0
JP2JP2
1
2
3
R108
0.01
R108
0.01
C67
0.1uF
C67
0.1uF
R112
100
R112
100
E23
EXT PULSE
E23
EXT PULSE
C66
0.22uF
C66
0.22uF
R103R103
E24
GND
E24
GND
R117
2
R117
2
16
dc1989abf
DEMO MANUAL DC1989A-B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
LINEAR TECHNOLOGY CORPORATION 2013
LT 0813 • 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
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