1
DEMO MANUAL DC2659A
Rev. 0
DESCRIPTION
LTM4671
Quad Output (Dual 12A, Dual 5A)
Step-Down µModule Regulator
Demonstration circuit 2659A features the LTM
®
4671
µModule
®
regulator, a high performance high efficiency
four output step-down regulator. The LTM4671EY has an
operating input voltage range of 3.6V to 20V providing
up to 12A from each of its two higher current rails and
up to 5A from each of its two lower current rails. The
two higher current rails’ output voltage is programmable
from 0.6V to 3.3V while the two lower current rails’ output
voltage is programmable from 0.6V to 5.5V. High current
rails can be paralleled together, and lower current rails
can be paralleled together to satisfy higher rail current
requirements. The LTM4671EY is a complete multi-output
DC-DC point-of-load regulator in a thermally enhanced
All registered trademarks and trademarks are the property of their respective owners.
16mm × 9.5mm × 4.82mm BGA package requiring only
a few input and output capacitors. Output voltage tracking
is made available by the TRACK/SS pins for supply rail
sequencing. Temperature sensing options are included
via the TSENSE and TMON pins. External clock synchro-
nization is available through the CLKIN pins, CLKOUT
pins provide for optional synchronization of additional
module phases. The LTM4671 data sheet must be read
in conjunction with this demo manual for working on or
modifying demo circuit 2659A
Design files for this circuit board are available.
BOARD PHOTO
2
DEMO MANUAL DC2659A
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2659A is an easy way to evalu-
ate the performance of the LTM4671EY. Please refer to
Figure 1 for test setup connections and follow the pro-
cedure below.
1. With power off, place the jumpers in the following
positions:
JP1 JP2 JP3 JP4 JP5 JP6 JP7
RUN0 RUN1 RUN2 RUN3 MODE0 MODE1 MODE3
ON ON ON ON CCM CCM CCM
2. Before connecting input supply, loads and meters, pre-
set the input voltage supply to be between 4V to 20V.
Preset the load currents to 0A.
3. With power off, connect the loads, input voltage supply
and meters as shown in Figure 1.
4. Turn on input power supply. The output voltage meters
for each phase should display the programmed output
voltage ±2%.
5. Once the proper output voltages are established, adjust
the load currents for each phase within the 0A–12A
range for VOUT0 and VOUT3 outputs and within 0A–5A
for VOUT1 and VOUT2 outputs. Observe each output’s
load regulation, efficiency, and other parameters. Out-
put voltage ripples for each output should be measured
across the furthest output capacitor with a BNC cable
and oscilloscope. BNCs J5 and J9 are available for
VOUT0 and VOUT2 ripple measurements, respectively.
6. To observe increased light load efficiency, for V
OUT0
and VOUT3 place the MODE pin jumpers (JP5, JP7) in
the DCM position, for V
OUT1
and V
OUT2
place the MODE
pin jumper (JP6) in the BURST position.
7. For optional load transient testing on-board transient
circuits are provided to measure transient responses
on V
OUT0
and V
OUT2
outputs. Place a positive pulse sig-
nal between the IOSTEPx_CLK pin and GND pins. The
pulse amplitude sets the load step current amplitude.
The pulse width should be short (<1ms) and pulse duty
cycle should be low (<15%) to limit the thermal stress
on the load transient circuit. The load step response for
VOUT0 and VOUT2 can be monitored with a BNC con-
nected to J4 (10mV/A) and J7 (20mV/A), respectively.
PERFORMANCE SUMMARY
PARAMETER CONDITIONS/NOTES VALUE
Input Voltage Range 3.6V – 20V
Output Voltage VOUT Jumper Selectable VOUT0 = 1.2VDC, VOUT1 = 2.5VDC,
VOUT2 = 3.3VDC, VOUT4 = 1VDC
Maximum Continuous Output Current per Phase De-Rating is Necessary for Certain Operating
Conditions. See Data Sheet for Details
IOUT0MAX, IOUT3MAX = 12ADC
IOUT1MAX, IOUT2MAX = 5ADC
Default Operating Frequency 600kHz (for VOUT0, VOUT3)
1MHz (for VOUT1, VOUT2)
Efficiency VIN = 12V
VOUT0 = 1.2V, IOUT = 12A
VOUT0 = 3.3V, IOUT = 5A
See Figure 2
87.4%
91.6%
Specifications are at TA = 25°C
4
DEMO MANUAL DC2659A
Rev. 0
QUICK START PROCEDURE
LOAD CURRENT (A)
0
1
2
3
4
5
7
8
9
10
11
12
75
77
79
81
83
85
87
89
91
93
95
97
EFFICIENCY (%)
DC2659A F02a
1.2VOUT0
2.5VOUT1
3.3VOUT2
1VOUT3
LOAD CURRENT (A)
0
1
2
3
4
5
7
8
9
10
11
12
75
77
79
81
83
85
87
89
91
93
95
97
EFFICIENCY (%)
DC2659A F02b
1.2VOUT0
2.5VOUT1
3.3VOUT2
1VOUT3
Figure 2. Measured Supply Efficiency at 5VIN and 12VIN
(b) 12VIN CCM Efficiency(a) 5VIN CCM Efficiency
Figure 3. Measured VOUT0 = 1.2V and VOUT3 = 1V Load Transient Responses (6A Load Step)
VOUT0: 20mV/DIV
IOUT0_STEP: 5A/DIV
VIN (V) VOUT0 (V) COUT CERAMIC
12 1.2 2 × 100μF/6.3V/Ceramic
+1 × 330μF/6.3V/Bulk
VIN (V) VOUT3 (V) COUT CERAMIC
12 1 2 × 100μF/6.3V/Ceramic
+1 × 330μF/6.3V/Bulk
VOUT3: 20mV/DIV
IOUT3_STEP: 5A/DIV
5
DEMO MANUAL DC2659A
Rev. 0
QUICK START PROCEDURE
VOUT1: 100mV/DIV
IOUT1_STEP: 2A/DIV
VOUT2: 100mV/DIV
IOUT2_STEP: 5A/DIV
Figure 4. Measured VOUT1 = 2.5V and VOUT2 =3.3V Load Transient Responses (2.5A Load Step)
VIN (V) VOUT1 (V) COUT CERAMIC
12 2.5 2 × 47μF/6.3V/Ceramic
+1 × 10μF/6.3V/Ceramic
VIN (V) VOUT2 (V) COUT CERAMIC
12 3.3 2 × 47μF/6.3V/Ceramic
+1 × 10μF/6.3V/Ceramic
VIN (V) AIRFLOW HEATSINK AMBIENT (°C)
12 Natural Convection None 23
VIN (V) AIRFLOW HEATSINK AMBIENT (°C)
12 Forced Air
200LFM
None 23
CHANNEL VOUT0 VOUT1 VOUT2 VOUT3
VOUT (V) 1.2 2.5 3.3 1
IOUT (A) 10 4 4 10
CHANNEL VOUT0 VOUT1 VOUT2 VOUT3
VOUT (V) 1.2 2.5 3.3 1
IOUT (A) 12 5 5 12
Figure 5. Measured Thermal Captures
6
DEMO MANUAL DC2659A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 4 C2, C3, C4, C5 CAP., 22μF, X5R, 25V, 20%, 1206 MURATA, GRM31CR61E226ME15L
2 2 C8, C35 CAP., 100μF, X5R, 6.3V, 20%, 1210 TDK, C3225X5R0J107M250AC
3 2 C18, C28 CAP., 47μF, X5R, 16V, 20%, 1206 TDK, C3216X5R1C476M160AB
4 1 R4 RES., 60.4k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060360K4FKEA
5 1 R13 RES., 19.1k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060319K1FKEA
6 1 R29 RES., 13.3k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060313K3FKEA
7 1 R39 RES., 90.9k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060390K9FKEA
8 1 U1 IC, QUAD HIGH EFFICIENCY MODULE,
BGA-16mm × 9.5mm × 4.72mm
ANALOG DEVICES., LTM4671EY#PBF
Additional Demo Board Circuit Components
1 2 C7, C34 CAP., 330μF, ALUM. ELECT., 2.5V, 20%,
7343, 9mΩ, 6.3A
PANASONIC, EEFSX0E331ER
2 2 C9, C36 CAP., 100μF, X5R, 6.3V, 20%, 1206 TDK, C3216X5R0J107M160AB
3 2 C17, C27 CAP., 10μF, X5R, 16V, 10%, 0805 MURATA, GRM21BR61C106KE15L
4 2 C19, C29 CAP., 47μF, X5R, 16V, 20%, 1206 TDK, C3216X5R1C476M160AB
5 2 C20, C30 CAP., 22pF, C0G, 50V, 5%, 0603 MURATA, GRM1885C1H220JA01J
6 2 C12, C39 CAP., 330pF, C0G, 50V, 5%, 0603 MURATA, GRM1885C1H331JA01J
7 2 C15, C32 CAP., 0.1μF, X7R, 50V, 10%, 0603 TDK, C1608X7R1H104K080AA
8 1 C1 CAP., 100μF, TANT. POLY., 25V, 20%, 7343 KEMET, T521X107M025ATE060
9 1 C6 CAP., 1μF, X5R, 16V, 10%, 0603 MURATA, GRM188R61C105KA93D
10 2 C22, C25 CAP., 0.01μF, X7R, 50V, 10%, 0603 KEMET, C0603C103K5RACTU
11 4 C40, C43, C45, C47 CAP., 1μF, X7R, 16V, 20%, 0603 TDK, C1608X7R1C105M080AC
12 2 C42, C46 CAP., 1μF, X7R, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L
13 2 Q1, Q2 XSTR., MOSFET, N-CH, 40V, TO-252 (DPAK) VISHAY, SUD50N04-8M8P-4GE3
14 16 R1, R3, R6, R7, R11, R15, R28,
R31, R35, R36, R74, R75, R76,
R77, R80, R81
RES., 0Ω, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA
15 10 R2, R5, R12, R16, R26, R32, R18,
R20, R22, R24
RES., 100k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603100KFKEA
16 4 R50, R51, R82, R83 RES., 1k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06031K00FKEA
17 2 R54, R69 RES., 10k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060310K0FKEA
18 1 R55 RES., 0.01, 1%, 1/2W, 2010, SENSE, AEC-Q200 VISHAY, WSL2010R0100FEA
19 1 R70 RES., 0.02, 1%, 1/2W, 2010, SENSE, AEC-Q200 VISHAY, WSL2010R0200FEA
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DEMO MANUAL DC2659A
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Hardware
1 25 E1, E2, E3, E4, E5, E6, E7, E8, E9,
E10, E11, E12, E13, E14, E15, E16,
E17, E18, E19, E20, E21, E22, E23,
E24, E25
TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
2 6 J1, J2, J3, J10, J11, J12 CONN.,BANANA JACK, FEMALE, THT,
NON-INSULATED, SWAGE
KEYSTONE, 575-4
3 4 JP1, JP2, JP3, JP4 CONN., HDR, MALE, 1mm ×3mm × 2mm,
VERT, STR, THT
WURTH ELEKTRONIK, 62000311121
4 4 J4, J5, J7, J9 CONN., RF, BNC, RCPT JACK, 5-PIN, STR, THT, 50Ω AMPHENOL RF, 112404
5 2 JP5, JP7 CONN., HDR, MALE, 2mm × 2mm × 2mm,
VERT, STR, THT
WURTH ELEKTRONIK, 62000421121
6 1 JP6 CONN., HDR, MALE, 2mm × 3mm × 2mm,
VERT, STR, THT
WURTH ELEKTRONIK, 62000621121
7 4 MH1, MH2, MH3, MH4 STANDOFF, NYLON, SNAP-ON, 0.375" KEYSTONE, 8832
8 7 XJP1, XJP2, XJP3, XJP4, XJP5,
XJP6, XJP7
CONN., SHUNT, FEMALE, 2-POS,2mm WURTH ELEKTRONIK, 60800213421
8
DEMO MANUAL DC2659A
Rev. 0
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
E
E
D
D
C
C
B
B
A
A
uMODULE REGULATOR - DUAL12A, DUAL5A
QUAD OUTPUT STEP DOWN
710-DC2659A_REV04
QUAD OUTPUT STEP DOWN
710-DC2659A_REV04
QUAD OUTPUT STEP DOWN
710-DC2659A_REV04
+
+
+
9
DEMO MANUAL DC2659A
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications
subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D D
C C
B B
A A
DYNAMIC LOAD CIRCUITS
DO NOT EXCEED 5% DUTY CYCLE! DO NOT EXCEED 5% DUTY CYCLE!
uMODULE REGULATOR - DUAL12A, DUAL5A
QUAD OUTPUT STEP DOWN
710-DC2659A_REV04
QUAD OUTPUT STEP DOWN
710-DC2659A_REV04
QUAD OUTPUT STEP DOWN
710-DC2659A_REV04
GND
GND
10
DEMO MANUAL DC2659A
Rev. 0
ANALOG DEVICES, INC. 2019
5/19
www.analog.com
ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection
circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.
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