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User Manual for ANALOG DEVICES models including: DC2665B-B, LTM4638 Step Down Module Regulator, LTM4638, Step Down Module Regulator, Down Module Regulator, Module Regulator, Regulator
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DocumentDocumentDEMO MANUAL DC2665B-B
DESCRIPTION
LTM4638
20VIN, 15A Step-Down µModule Regulator
Demonstration circuit 2665B-B features the LTM®4638 µModule® regulator, a high performance, high efficiency step-down regulator. The LTM4638 is a complete DC/DC point-of-load regulator in a thermally enhanced 6.25mm × 6.25mm × 5.02mm BGA package. The LTM4638 has an operating input voltage range of 3.1V to 20V and provides an output current up to 15A. The output voltage is programmable from 0.6V to 5.5V and can be remotely sensed. The stacked inductor design improves thermal dissipation and significantly reduces the package
area. Output 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 efficiency at low load currents, select discontinuous current mode (DCM) operation using the MODE jumper (JP7) in less noise sensitive applications. Refer to the LTM4638 data sheet in conjunction with this demo manual for working on or modifying the DC2665B-B.
Design files for this circuit board are available.
All registered trademarks and trademarks are the property of their respective owners.
BOARD PHOTO Part marking is either ink mark or laser mark
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DEMO MANUAL DC2665B-B
PERFORMANCE SUMMARY Specifications are at TA = 25°C
PARAMETER Input Voltage Range Output Voltage, VOUT
Maximum Continuous Output Current Default Operating Frequency Efficiency
CONDITIONS
MIN
TYP
MAX
3.1
20
Jumper Selection on JP1 Jumper Selection on JP2 Jumper Selection on JP3 Jumper Selection on JP4 Jumper Selection on JP5
0.98
1.0
1.02
1.47
1.5
1.53
2.45
2.5
2.55
3.23
3.3
3.37
4.9
5.0
5.1
Derating Is Necessary for Certain Operating Conditions
15
(See Data Sheet for Details)
600
VIN = 12V, VOUT = 1V, IOUT = 15A
85.3
UNITS V V V V V V A
kHz %
QUICK START PROCEDURE
Demonstration circuit 2665B-B is an easy way to evaluate the performance of the LTM4638EY. Refer to Figure 1 for test setup connections and use the following procedure.
1. With the power off, place the jumpers in the following positions:
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 and 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 15A 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).
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QUICK START PROCEDURE
DEMO MANUAL DC2665B-B
Figure 1. Test Setup of DC2665B-B
NOTES:
1. To achieve the minimum output ripple voltage, optimize the operation frequency at different input and output voltages. 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 LTM4638 data sheet for detailed calculation of RfSET (R5).
Table 1. Suggested Operation Frequencies
VOUT (V) fSW (kHz)
3.3VIN
5VIN
12VIN
1 1.2 1.5 1.8 2.5 1 1.2 1.5 1.8 2.5 3.3 1 1.2 1.5 1.8 2.5 3.3 5
500 500 500 500 500 600 600 600 800 800 800 600 600 800 800 1000 1000 1500
2. For applications that require small output voltage ripple, add shunt-through three-terminal capacitors on the output at C41 and C42.
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DEMO MANUAL DC2665B-B
QUICK START PROCEDURE
EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%)
98
96
94
92
90
88
86
84
82
80 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
LOAD CURRENT (A)
dc2665bb F02a
1VOUT, 500kHz 1.2VOUT, 500kHz 1.5VOUT, 500kHz
1.8VOUT, 500kHz 2.5VOUT, 500kHz
(a) 3.3VIN
98
96
94
92
90
88
86
84
82
80 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
LOAD CURRENT (A)
dc2665bb F02b
1VOUT, 600kHz 1.2VOUT, 600kHz 1.5VOUT, 600kHz
1.8VOUT, 800kHz 2.5VOUT, 800kHz 3.3VOUT, 800kHz
(b) 5VIN
96
94
92
90
88
86
84
82
80
78 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
LOAD CURRENT (A)
dc2665bb F02c
1VOUT, 600kHz 1.2VOUT, 600kHz 1.5VOUT, 800kHz 1.8VOUT, 800kHz
2.5VOUT, 1MHz 3.3VOUT, 1MHz 5VOUT, 1.5MHz
(c) 12VIN
Figure 2. Measured Supply, CCM Efficiency vs Load Current
(a) 1VOUT, 600kHz
(b) 5VOUT, 1.5MHz
Figure 3. Measured Thermal Capture at 12VIN, IOUT = 15A at 25°C Ambient with No Airflow
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QUICK START PROCEDURE
DEMO MANUAL DC2665B-B
VOUT 50mV/DIV
ILOAD 2A/DIV
VOUT(PK-PK) = 55mV
50s/DIV
(a) 1VOUT
dc2665bb F04a
VOUT 50mV/DIV
ILOAD 2A/DIV
VOUT(PK-PK) = 66mV
50s/DIV
(b) 5VOUT
dc2665bb F04b
Figure 4. Load Transient (7.5A to 11.25A) Response Waveform at 12VIN
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DEMO MANUAL DC2665B-B QUICK START PROCEDURE
VOUT (FULL BW) 10mV/DIV
VOUT(PK-PK) = 37mV
1s/DIV
dc2665bb F05a
(a) 1VOUT, 600kHz, Full Bandwidth at 500MHz
VOUT (20MHz BW)
10mV/DIV
VOUT(PK-PK) = 5.6mV
1s/DIV
dc2665bb F05b
(b) 1VOUT, 600kHz, 20MHz Bandwidth
VOUT (FULL BW) 10mV/DIV
VOUT (20MHz BW)
10mV/DIV
VOUT(PK-PK) = 36.8mV
1s/DIV
dc2665bb F05c
(c) 5VOUT, 1.5MHz, Full Bandwidth at 500MHz
VOUT(PK-PK) = 7.2mV
1s/DIV
dc2665bb F05d
(d) 5VOUT, 1.5MHz, 20MHz Bandwidth
Figure 5. Tested VOUT AC Ripple at 12VIN, IOUT = 15A , VOUT Ripple Is Tested Across C12
PARTS LIST
ITEM QTY REFERENCE
Required Circuit Components
1
3 C1, C6, C31
2
3 C2, C3, C38
3
1 C33
4
4 C5, C11, C12, C30
5
1 C7
6
1 C8
7
1 C10
8
1 C18
9
1 C29
10
1 C34
6
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PART DESCRIPTION
MANUFACTURER/PART NUMBER
CAP., 2.2F, X7R, 10V, 20%, 0603 CAP., 22F, X5R, 25V, 10%, 1206 CAP., 1F, X7R, 25V, 10%, 0603 CAP., 220F, X5R, 6.3V, 20%, 1206 CAP., 0.1F, X7R, 25V, 10%, 0603 CAP., 100pF, X7R, 25V, 5%, 0603 CAP., 220F, ALUM HYB, 35V, 20% CAP., 1F, X7R, 10V, 20%, 0603 CAP., 0.022F, X7R, 50V, 10%, 0603 CAP., 1F, X7R, 6.3V, 10%, 0402
TDK, C1608X7R1A225M080AC AVX, 12063D226KAT2A TDK, C1608X7R1E105K080AB MURATA, GRM31CR60J227ME11L AVX, 06033C104KAT2A AVX, 06033C101JAT2A SUN ELECTRONIC, 35HVH220M AVX, 0603ZC105MAT2A KEMET, C0603C223K5RAC7867 MURATA, GRM155R70J105KA12D
Rev. 0
PARTS LIST
ITEM QTY REFERENCE
11
1 R3
12
1 R4
13
1 R6
14
1 R14
15
1 R15
16
1 R24
17
2 R8, R16
18
2 R9, R10
19
1 R17
20
1 R7
21
1 Q1
22
1 RS2
23
1 U1
Additional Demo Board Circuit Components
24
0 C4, C9, C15, C19, C36, C43, C44
25
0 C16, C22-C24
26
0 C17, C20, C21
27
0 C25-C28
28
0 C39
29
0 C40
30
0 C41
31
0 C42
32
0 R18
33
0 C35
34
0 R21-R23
35
0 R1, R2, R5, R11-R13, R19, R20
36
0 L1
37
0 L2
Hardware: For Demo Board Only
38 10 E1, E3, E5, E6, E8-E12, E14
39
4 E2, E4, E7, E13
40
2 J1, J2
41
5 JP1-JP6
42
1 JP7
43
1 JP8
44
4 MP1-MP4
45
3 XJP1, XJP7, XJP8
DEMO MANUAL DC2665B-B
PART DESCRIPTION RES., 10k, 1%, 1/10W, 0603 RES., 90.9k, 0.5%, 1/10W, 0603 RES., 40.2k, 0.5%, 1/10W, 0603 RES., 13.3k, 0.5%, 1/10W, 0603 RES., 19.1k, 0.5%, 1/10W, 0603 RES., 8.25k, 0.5% 1/10W 0603 RES., 100k, 1%, 1/10W, 0603 RES., 0,5%, 1/16W, 0402 RES., 0, 1/10W, JUMPER, 0603 RES., 150k, 5%, 1/10W, 0603 XSTR, MOSFET, N-CH, 40V, TO-252 (DPAK) RES., SENSE, 0.005, 1%, 1W, 2512 IC, 20V, 15A STEP-DOWN Module REG
MANUFACTURER/PART NUMBER VISHAY, CRCW060310K0FKEAC SUSUMU, RG1608P-9092-D-T5 SUSUMU, RG1608P-4022-D-T5 SUSUMU, RG1608P-1332-D-T5 SUSUMU, RG1608P-1912-D-T5 SUSUMU, RG1608P-8251-D-T5 STACKPOLE ELECTRONICS, RMCF0603FG100K ROHM, SFR01MZPJ000 YAGEO, RC0603FR-070RL YAGEO, RC0603JR-07150KL VISHAY, SUD50N04-8M8P-4GE3 VISHAY, WSL25125L000FEA ANALOG DEVICES, INC. LTM4638EY#PBF
CAP., OPTION, 0603 CAP., OPTION, 0805 CAP., OPTION, 1206 CAP., OPTION, 1210 CAP., OPTION, 0805, 3-PC Pad CAP., OPTION, 1206, 3-PC Pad CAP., OPTION, 0603, 3-PC Pad CAP., OPTION, 1206, 3-PC Pad RES., OPTION, 0805 CAP., OPTION, 0805 RES., OPTION, 0402 RES., OPTION, 0603 IND.,OPTION,1812 IND.,OPTION, 4mm × 4mm, AEX-Q200
OPTION OPTION OPTION OPTION MURATA, NFM21PC104R1E3D TDK, YFF31HC2A104MT000N MURATA, NFM18CC223R1C3D MURATA, NFM31PC276B0J3L OPTION OPTION OPTION OPTION OPTION COILCRAFT, XEL4020-800MEC
TESTPOINT, TURRET 0.064" JACK, BANANA CONN, BNC, 5 PINS HEADER, 1×2, 2mm HEADER, 2×3, 2mm HEADER, 1×3, 2mm STAND-OFF, NYLON 0.5" SHUNT, 2mm
MILL-MAX, 2308-2-00-80-00-00-07-0 KEYSTONE, 575-4 AMPHENOL RF, 112404 SULLINS, NRPN021PAEN-RC SULLINS, NRPN032PAEN-RC SAMTEC, TMM-103-02-L-S KEYSTONE, 8833 (SNAP ON) SAMTEC, 2SN-BK-G
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DEMO MANUAL DC2665B-B SCHEMATIC DIAGRAM
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REVISION HISTORY
ECO REV 01
DESCRIPTION PRODUCTION
DATE APPROVED
11/15/22
S J
D
D
E1 CLKOUT
CLKOUT
E8 TRACK
C7 0.1uF 25V
E5
R8
PGOOD
100k
C1
R20
2.2uF
R12
OPT
10V
OPT
C
R5
E1 FREQ
R19
OPT
OPT JP7
MODE
G5 PHMODE
1
2 CCM
3
4 DCM
D2 MODE/CLKIN
5
6 CLKIN
CLKIN E3
E6 VIN
E2
VIN
C2 22uF 25V 1206
C29 0.022uF 50V 0603
VIN
E3 VIN D4 VIN D3 VIN E4 VIN F4 VIN G4 VIN
3.1V - 20V
GND E4
C10 + 220uF 35V
C38 22uF 25V 1206
C3 C21 C33
22uF OPT 1uF
25V 1206
1206
25V
B4 RUN
B
E11
GND E14
GND
JP8
RUN
1
R7 150k
ON
2
C4
0603 OPT
R11 OPT
0603
OFF
3
B6 GND C3 GND C4 GND C5 GND C6 GND C7 GND D5 GND D6 GND D7 GND E5 GND E6 GND E7 GND F5 GND F6 GND F7 GND G6 GND G7 GND B2 SGND
INTVCC B3 PGOOD B5 TRACK/SS E2 CLKOUT F2
SW B7
J2 VOUT
5
4 3 2
1
VOUT
C43
C44 C18
OPT
OPT
1uF 10V
R18 OPT 0805
C35 OPT
0805 VIN
R16 100k
R22 OPT 0402
RS2 0.005 1W 1% 2512
3
2
2 3 4 5
Q1 SUD50N04-8m8P
1
J1
IO STEP 1
R3 10k
E10 IO STEP CLK
TSENSE- A7
TSENSE+ A6
COMPa D1 COMPb F1 VOUTS+ B1
R17 0
VOSNS+
R13
OPT
C9
OPT
C15 OPT
VOSNS+
E12 VOSNS+
VOUTS- C2
VOSNS-
R10
0
R21
VOUT A1
OPT
*U1
VOUT A2 VOUT A3 VOUT A4 VOUT A5 VOUT1 F3 VOUT1 G1
VOUT
C34 C31
C6
C5 220uF C16
C12
C11
C30
220uF 220uF 220uF C20
C17
C36
C8
R2
1uF 2.2uF 2.2uF 6.3V
6.3V 10V
10V
1206
100pF OPT 0402
OPT 0805
6.3V 1206
6.3V 1206
6.3V 1206
1206 OPT
1206 OPT
OPT
25V
X7R
C41
1
3
2
OPT
C42 OPT
VOUT1 G2
VOUT1 G3
FB C1
*R4
*R6
*R15
*R14
*R24
R1
OPT
JP1
JP2
JP3
JP4
JP5
JP6
R9 0
C19 OPT VOSNS-
R23 OPT
VOSNSE9
1.0V
1.5V
2.5V
3.3V
5.0V
SET
VOSNS-
C
E7
VOUT GND
E13
B
* VERSION
U1
R4 R6 R15 R14 R24
- A
LTM4626EY#PBF 90.9k 40.2k 19.1k 13.3k 8.25k
- B
LTM4638EY#PBF 90.9k 40.2k 19.1k 13.3k 8.25k
- C
LTM4657EY#PBF 60.4k 31.1k 15k 10.7k 6.65k
OPT EMI FILTER
C39
1
3 VIN
2
OPT
L1 OPT
L2
A
NOTES: UNLEES OTHERWISE SPECIFIED, 1. ALL RESISTORS AND CAPACITORS ARE 0603.
VIN EMI TP2
GND EMI
C22 C23 C24 OPT 0805
1812 C25 OPT 1210
C26 OPT C27
OPT 1210
C40
VIN
C28 OPT
OPT
<Variant Name>
CUSTOMER NOTICE
APPROVALS
ANALOG
A
TP3
ANALOG DEVICES HAS MADE A BEST EFFORT TO DESIGN A PCB DES. AN CIRCUIT THAT MEETS CUSTOMER-SUPPLIED
DEVICES
SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S APP ENG. Sun J.
RESPONSIBILITY TO VERIFY PROPER AND RELIABLE
OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT
TITLE: SCHEMATIC
MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT ANALOG DEVICES
20V STEP-DOWN µMODULE REGULATOR
APPLICATIONS ENGINEERING FOR ASSISTANCE.
IC NO. LTM46XXEY
SCHEMATIC NO. AND REVISION:
THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.
SKU NO. DC2665B
710-DC2665B_REV 01
SIZE: N/A DATE: Tuesday, November 15, 2022
SHEET 1 OF 1
5
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DEMO MANUAL DC2665B-B
REVISION HISTORY
DEMO BOARD REV
DC2665A-B
DC2665B-B
DEMO MANUAL REV
0
0
DATE 02/19 12/22
DESCRIPTION Initial Release. DC2665B-B replaces DC2665A-B for low HF VOUT ripple.
PAGE NUMBER -- --
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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.
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DEMO MANUAL DC2665B-B
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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