Analog Devices DC2665B-C Quick setup guide

1
DEMO MANUAL DC2665B-C
Rev. 0
DESCRIPTION
LTM4657
20VIN, 8A Step-Down
µModule Regulator
Demonstration circuit 2665B-C features the LTM
®
4657
µModule
®
regulator, a high performance, high efficiency
step-down regulator. The LTM4657 is a complete DC/DC
point-of-load regulator in a thermally enhanced 6.25mm
× 6.25mm × 3.87mm BGA package. The LTM4657 has an
operating input voltage range of 3.1V to 20V and provides
an output current up to 8A. The output voltage is program-
mable from 0.5V to 5.5V and can be remotely sensed.
The stacked inductor design improves thermal dissipa-
tion and significantly reduces the package area. Output All registered trademarks and trademarks are the property of their respective owners.
voltage tracking is available through the TRACK/SS pin
for supply rail sequencing. External clock synchronization
is available through the SYNC/MODE pin. For high effi-
ciency at low load currents, select discontinuous current
mode(DCM) operation using the MODE jumper (JP7) in
less noise sensitive applications. Refer to the LTM4657
data sheet in conjunction with this demo manual for
working on or modifying DC2665B-C.
Design files for this circuit board are available.
BOARD PHOTO
Part marking is either ink mark or laser mark

2
DEMO MANUAL DC2665B-C
Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2665B-C is an easy way to evaluate
the performance of the LTM4657. Refer to Figure1 for test
setup connections and use the following the procedure.
1. With power off, place the jumpers in the following
positions:
JUMPER POSITION FUNCTION
JP8 JP7 JP1 to JP6
RUN MODE VOUT Select
ON CCM 1V
2. Before connecting the input supply, load, and meters,
preset the input voltage supply between 3.1V to 20V.
Preset the load current to 0A.
3. With the power off, connect the load, input voltage
supply, and meters as shown in Figure1.
4. Turn on the input power supply. The output voltage
meters for each phase display the ±1.2% programmed
output voltage.
5. Once the proper output voltage is established, adjust
the load current in the 0A to 8A range and observe
the load regulation, efficiency, and other parameters.
Measure the output voltage ripple across the furthest
output cap with a BNC cable and oscilloscope from J2.
6. Place the MODE pin jumper (JP7) in the DCM position
to observe increased light load efficiency.
7. For optional load transient testing, an onboard
transient circuit is provided to measure transient
response. Place a positive pulse signal between the
IO_STEP_CLK (E10) pin and GND pin. The pulse
amplitude sets the load step current amplitude. Keep
the pulse width short (<1ms) and the pulse duty cycle
low (<15%) to limit the thermal stress on the load
transient circuit. Monitor the load step with a BNC
connected to J1 (5mV/A).
PERFORMANCE SUMMARY
Specifications are at TA= 25°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range 3.1 20 V
Output Voltage, VOUT Jumper Selection on JP1
Jumper Selection on JP2
Jumper Selection on JP3
Jumper Selection on JP4
Jumper Selection on JP5
0.98
1.47
2.45
3.23
4.9
1.0
1.5
2.5
3.3
5.0
1.02
1.53
2.55
3.37
5.1
V
V
V
V
V
Maximum Continuous Output Current Derating Is Necessary for Certain Operating Conditions
(See Data Sheet for Details)
8 A
Default Operating Frequency 500 kHz
Efficiency VIN = 12V, VOUT = 1V, IOUT = 8A 85.8 %

3
DEMO MANUAL DC2665B-C
Rev. 0
QUICK START PROCEDURE
Figure1. Test Setup of DC2665B-C
dc2665bc F01
NOTES:
1. To achieve the minimum output ripple voltage, optimize the operation frequency at different input and output volt-
ages. Suggested operation frequencies at different voltages are shown in Table1. Adjust the operation frequency
by changing the value of RfSET (R5). Refer to the LTM4657 data sheet for detailed calculation of RfSET (R5).
Table1. Suggested Operation Frequencies
3.3VIN 5VIN 12VIN
VOUT (V) 1 1.5 2.5 1 1.5 2.5 3.3 1 1.5 2.5 3.3 5
fSW (kHz) 500 650 800 500 650 800 1000 500 650 800 1000 1250
2. For applications that require small output voltage ripple, add shunt-through three-terminal capacitors on the output
at C41 and C42.

4
DEMO MANUAL DC2665B-C
Rev. 0
QUICK START PROCEDURE
Figure2. Measured Supply Efficiency (CCM Efficiency vs Load Current)
(a) 3.3VIN (b) 5VIN (c) 12VIN
dc2665bc F02a
LOAD CURRENT (A)
0
1
2
3
5
6
7
8
80
82
84
86
88
90
92
94
96
98
EFFICIENCY (%)
1VOUT, 500kHz
1.5VOUT, 650kHz
2.5VOUT, 800kHz
dc2665bc F02b
LOAD CURRENT (A)
0
1
2
3
5
6
7
8
80
82
84
86
88
90
92
94
96
98
EFFICIENCY (%)
1VOUT, 500kHz
1.5VOUT, 650kHz
2.5VOUT, 800kHz
3.3VOUT, 1MHz
dc2665bb F02c
LOAD CURRENT (A)
0
1
2
3
4
5
6
7
8
76
78
80
82
84
86
88
90
92
94
96
EFFICIENCY (%)
1VOUT, 500kHz
1.5VOUT, 650kHz
2.5VOUT, 800kHz
3.3VOUT, 1MHz
5VOUT, 1.25MHz
Figure3. Measured Thermal Capture at 12V
IN
, I
OUT
=8A at 25°C Ambient with No Airflow
(a) 1VOUT, 500kHz (b) 5VOUT, 1.25MHz

5
DEMO MANUAL DC2665B-C
Rev. 0
QUICK START PROCEDURE
Figure4. Load Transient (4A to 6A) Response Waveform at 12VIN
(a) 1VOUT
(b) 5VOUT
dc2665bc F04a
40μs/DIV
VOUT(PK-PK) = 28mV
VOUT
20mV/DIV
ILOAD
1A/DIV
dc2665bc F04b
40μs/DIV
VOUT(PK-PK) = 32.8mV
VOUT
20mV/DIV
ILOAD
1A/DIV
QUICK START PROCEDURE

6
DEMO MANUAL DC2665B-C
Rev. 0
Figure5. Tested VOUT AC Ripple at 12VIN, , IOUT = 8A, VOUT Ripple Is Tested Across C12
QUICK START PROCEDURE
(a) 1VOUT, 500kHz, Full Bandwidth at 500MHz (b) 1VOUT, 500kHz, 20MHz Bandwidth
(c) 5VOUT, 1.25MHz, Full Bandwidth at 500MHz (d) 5VOUT, 1.25MHz, 20MHz Bandwidth
PARTS LIST
dc2665bc F05a
1μs/DIV
VOUT(PK-PK) = 20mV
VOUT
10mV/DIV
dc2665bc F05b
1μs/DIV
VOUT(PK-PK) = 6.8mV
VOUT
10mV/DIV
dc2665bc F05c
1μs/DIV
VOUT(PK-PK) = 18mV
VOUT
10mV/DIV
dc2665bc F05d
1μs/DIV
VOUT(PK-PK) = 5.6mV
VOUT
10mV/DIV
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 C1, C6, C31 CAP., 2.2μF, X7R, 10V, 20%, 0603 TDK, C1608X7R1A225M080AC
2 3 C2, C3, C38 CAP., 22μF, X5R, 25V, 10%, 1206 AVX, 12063D226KAT2A
3 1 C33 CAP., 1μF, X7R, 25V, 10%, 0603 TDK, C1608X7R1E105K080AB
4 4 C5, C11, C12, C30 CAP., 220μF, X5R, 6.3V, 20%, 1206 MURATA, GRM31CR60J227ME11L
5 1 C7 CAP., 0.1μF, X7R, 25V, 10%, 0603 AVX, 06033C104KAT2A
6 1 C8 CAP., 100pF, X7R, 25V, 5%, 0603 AVX, 06033C101JAT2A
7 1 C10 CAP., 220μF, ALUM HYB, 35V, 20% SUN ELECTRONIC, 35HVH220M
8 1 C18 CAP., 1μF, X7R, 10V, 20%, 0603 AVX, 0603ZC105MAT2A
9 1 C29 CAP., 0.022μF, X7R, 50V, 10%, 0603 KEMET, C0603C223K5RAC7867

7
DEMO MANUAL DC2665B-C
Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
10 1 C34 CAP., 1μF, X7R, 6.3V, 10%, 0402 MURATA, GRM155R70J105KA12D
11 1 R3 RES., 10k, 1%, 1/10W, 0603 VISHAY, CRCW060310K0FKEAC
12 1 R4 RES., 60.4k, 1%, 1/10W, 0603 VISHAY, CRCW060360K4FKEA
13 1 R6 RES., 30.1k, 1%, 1/10W, 0603 VISHAY, CRCW060330K1FKEA
14 1 R14 RES., 10.7k, 1%, 1/10W, 0603 YAGEO, RC0603FR-0710K7L
15 1 R15 RES., 15k, 1%, 1/10W, 0603 VISHAY, CRCW060315K0FKEA
16 1 R24 RES., 6.65k, 1% 1/10W 0603 YAGEO, RC0603FR-076K65L
17 2 R8, R16 RES., 100k, 1%, 1/10W, 0603 STACKPOLE ELECTRONICS, RMCF0603FG100K
18 2 R9, R10 RES., 0Ω, 5%, 1/16W, 0402 ROHM, SFR01MZPJ000
19 1 R17 RES., 0Ω, 1/10W, JUMPER, 0603 YAGEO, RC0603FR-070RL
20 1 R7 RES., 150k, 5%, 1/10W, 0603 YAGEO, RC0603JR-07150KL
21 1 Q1 XSTR, MOSFET, N-CH, 40V, TO-252 (DPAK) VISHAY, SUD50N04-8M8P-4GE3
22 1 RS2 RES., SENSE, 0.005Ω, 1%, 1W, 2512 VISHAY, WSL25125L000FEA
23 1 U1 IC, 20V, 8A STEP-DOWN μModule REG. ANALOG DEVICES, INC. LTM4657EY#PBF
Additional Demo Board Circuit Components
24 0 C4, C9, C15, C36, C19, C43, C44 CAP., OPTION, 0603 OPTION
25 0 C13, C16, C22-C24, C37 CAP., OPTION, 0805 OPTION
26 0 C21, C20, C17 CAP., OPTION, 1206 OPTION
27 0 C25-C28 CAP., OPTION, 1210 OPTION
28 0 C39 CAP., OPTION, 0805, 3 PC Pad MURATA, NFM21PC104R1E3D
29 0 C40 CAP., OPTION, 1206, 3 PC Pad TDK, YFF31HC2A104MT000N
30 0 C41 CAP., OPTION, 0603, 3 PC Pad MURATA, NFM18CC223R1C3D
31 0 C42 CAP., OPTION, 1206, 3 PC Pad MURATA, NFM31PC276B0J3L
32 0 R18 RES., OPTION, 0805 OPTION
33 0 C35 CAP., OPTION, 0805 OPTION
34 0 R21-R23 RES., OPTION, 0402 OPTION
35 0 R1, R2, R5, R11-R13, R19, R20 RES., OPTION, 0603 OPTION
36 0 L1 IND., OPTION, 1812 OPTION
37 0 L2 IND., OPTION, 4mm × 4mm, AEX-Q200 COILCRAFT, XEL4020-800MEC
Hardware: For Demo Board Only
38 10 E1, E3, E5, E6, E8-E12, E14 TESTPOINT, TURRET 0.064" MILL-MAX, 2308-2-00-80-00-00-07-0
39 4 E2, E4, E7, E13 JACK, BANANA KEYSTONE, 575-4
40 2 J1, J2 CONN, BNC, 5 PINS AMPHENOL RF, 112404
41 5 JP1, JP2-JP6 HEADER, 1×2, 2mm SULLINS, NRPN021PAEN-RC
42 1 JP7 HEADER, 2×3, 2mm SULLINS, NRPN032PAEN-RC
43 1 JP8 HEADER, 1×3, 2mm SAMTEC, TMM-103-02-L-S
44 4 MP1-MP4 STAND-OFF, NYLON 0.5" KEYSTONE, 8833(SNAP ON)
45 3 XJP1, XJP7, XJP8 SHUNT, 2mm SAMTEC, 2SN-BK-G

8
DEMO MANUAL DC2665B-C
Rev. 0
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
CLKIN
CCM
DCM
3.1V - 20V
NOTES: UNLEES OTHERWISE SPECIFIED,
1. ALL RESISTORS AND CAPACITORS ARE 0603.
ON
OFF
OPT EMI FILTER
REVISION HISTORY
DATEDESCRIPTION
S J
REV APPROVED
PRODUCTION
01
ECO
11/15/22
OPT
OPT
OPT
OPT
OPT
20V STEP-DOWN µMODULE REGULATOR
LTM4638EY#PBF
- A
VERSION
LTM4626EY#PBF
- B
8.25k
40.2k
R15R4
90.9k
40.2k 19.1k
R14 R24R6U1
19.1k
*
- C
90.9k 13.3k
LTM4657EY#PBF 60.4k 31.1k 15k
13.3k 10.7k
8.25k 6.65k
VOSNS-
VOSNS+
VIN
VOSNS-
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
SKU NO. IC NO.
ANALOG DEVICES 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 BO ARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILIT Y. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
ANALOG
DEVICES
11
AN Sun J.
LTM46XXEY DC2665B
710-DC2665B_REV 01
N/A Tuesday, November 15, 2022
<Variant Name>
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY T O ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
SKU NO. IC NO.
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIF Y PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BO ARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILIT Y. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
ANALOG
DEVICES
11
AN Sun J.
LTM46XXEY DC2665B
710-DC2665B_REV 01
N/A Tuesday, November 15, 2022
<Variant Name>
DATE:
SHEET OF
TITLE: SCHEMATIC
APPROVALS
PCB DES. APP ENG.
SIZE:
SCHEMATIC NO. AND REVISION:
CUSTOMER NOTICE
THIS CIRCUIT IS PROPRIETARY T O ANALOG DEVICES AND
SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
SKU NO. IC NO.
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIF Y PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BO ARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILIT Y. CONTACT ANALOG DEVICES APPLICATIONS ENGINEERING FOR ASSISTANCE.
ANALOG
DEVICES
11
AN Sun J.
LTM46XXEY DC2665B
710-DC2665B_REV 01
N/A Tuesday, November 15, 2022
<Variant Name>
E13
GND
E14
GND
C1 2.2uF 10V
C41
1 3
2
C40
*U1
FREQ
E1
PHMODE
G5
TSENSE+ A6
TRACK/SS E2
COMPa D1
RUN
B4
PGOOD B5
VOUT A2
GND
C4 INTVCC B3
CLKOUT F2
MODE/CLKIN
D2
VIN
G4 VOUT1 G1
VOUT A3
VOUT1 G3 VOUT1 F3
GND
C6
GND
C7
GND
D5
GND
D7
GND
E5
GND
E6
GND
D6
GND
E7
GND
F5
GND
F6
GND
F7
GND
G6
GND
G7
GND
B6
GND
C5
VOUT A1
VIN
E4
VIN
F4
GND
C3
VIN
E3
VIN
D3
VIN
D4
VOUTS- C2
VOUTS+ B1
FB C1
COMPb F1
TSENSE- A7
SW B7
SGND
B2
VOUT A4 VOUT A5
VOUT1 G2
C19
OPT
C7 0.1uF
25V
C2
22uF 25V
1206
C15 OPT
E2
VIN
TP2
VIN EMI
L1 OPT
1812
JP7
MODE
1 2 3 4 5 6
R18
OPT
0805
C38 22uF 25V 1206
JP2
1.5V
*R6
C35
OPT
0805
C23 OPT
C20
OPT
1206
C6 2.2uF 10V
TP3
GND EMI
C25 OPT 1210
E8
TRACK
R17 0
E4
GND
C17
OPT
1206
*R4
C21 OPT 1206
C3 22uF 25V 1206
E10
IO STEP CLK
J2
VOUT
1
2
3
4
5
C26
C29
0.022uF
0603
50V
R21 OPT
Q1
SUD50N04-8m8P
2
1
3
E9
VOSNS-
E11
GND
E3
CLKIN
C39
1 3
2
C16 OPT 0805
+
C10 220uF 35V
E6
VIN
C28 OPT
*R15
C33 1uF 25V
JP8
RUN
1 3 2
R7 150k
R8 100k
JP5
5.0V
C8 100pF 25V
C31 2.2uF 10V
*R14
R5
OPT
C42
R2
OPT
C12 220uF 6.3V 1206
R19 OPT
R10
0
C44
OPT
C5 220uF 6.3V 1206
C34 1uF 0402 6.3V X7R
R3
10k
C9
OPT
C4
OPT
0603
C22
JP3
2.5V
JP6
SET
R20
OPT
C24
0805
C30 220uF 6.3V 1206
R1
OPT
*R24
C11 220uF 6.3V 1206
R11 OPT 0603
R22
OPT
0402
E5
PGOOD
L2
C43
OPT
R12
OPT
C18 1uF 10V
JP1
1.0V
RS2
0.005
1W
2512
1%
E1
CLKOUT
R16 100k
R13
OPT
C27 OPT 1210
E12
VOSNS+
R9
0
J1
IO STEP
1
2
3
4
5
R23 OPT
E7
VOUT
C36 OPT
JP4
3.3V
VOUT
VOSNS+ VOSNS-
CLKOUT
VIN
VIN
VIN
VOUT

9
DEMO MANUAL DC2665B-C
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.
REVISION HISTORY
DEMO BOARD
REV
DEMO MANUAL
REV DATE DESCRIPTION PAGE NUMBER
DC2989A 0 02/20 Initial Release. —
DC2665B-C 0 12/22 DC2665B-C replaces DC2989A for low HF VOUT ripple. —

10
DEMO MANUAL DC2665B-C
Rev. 0
 ANALOG DEVICES, INC. 2023
2/23
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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