1
DEMO MANUAL DC2753A
UG-1365 Rev. 0
DESCRIPTION
LTM8074
1.2A Step-Down Silent Switcher
µModule Regulator
Demonstration circuit 2753A features the LTM
®
8074EY
µModule regulator, a tiny high performance high efficiency
step-down regulator with Silent Switcher
®
architecture.
DC2753A has an operating input voltage range of 3.4V
to 40V and is able to provide an output current of up to
1.2A. The output voltage can be programmed from 0.78V
up to 15V. The LTM8074EY is a complete DC/DC point
of load regulator in a thermally enhanced 4mm × 4mm
× 1.82mm BGA package requiring only a few input and
output capacitors.
All registered trademarks and trademarks are the property of their respective owners.
PERFORMANCE SUMMARY
BOARD PHOTO
The radiated EMI performances of the board (with EMI
filter) are shown in Figure 6 and Figure 7. The demo board
also has a conducted EMI filter installed. To use the con-
ducted EMI filter, the input should be tied to V
EMI
, not
VIN. An inductor L2, which is a 0Ω jumper on the board
by default now, can be added in the EMI filter to further
reduce the conducted emission.
The LTM8074 data sheet must be read in conjunction with
this demo manual for working on or modifying DC2753A.
Design files for this circuit board are available.
Specifications are at TA = 25°C
PARAMETER CONDITIONS/NOTES VALUE
Input Voltage Range 3.4V – 40V
Output Voltage VOUT Jumper Selectable 3.3VDC, 5VDC, 12VDC
Maximum Continuous Output Current De-Rating is Necessary for Certain Operating Conditions. See Data Sheet for Details 1.2ADC
Default Operating Frequency 2MHz
Efficiency VIN = 12V, VOUT = 5V, IOUT = 1.2A 89% See Figure 2
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DEMO MANUAL DC2753A
UG-1365 Rev. 0
QUICK START PROCEDURE
Demonstration circuit 2753A is an easy way to evalu-
ate the performance of the LTM8074EY. 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 posi-
tions for a typical 3.3VOUT application:
JP1 JP2 JP3
RUN MODE VOUT Select
ON PS 3.3V
2. Before connecting input supply, load and meters, pre-
set the input voltage supply to be between 3.4V to 40V.
Pre-set the load current to 0A.
Note: VEMI is the input pin with EMI filter. To bypass
input EMI filer, connect supply to VIN pin.
3. With power off, connect the load, input voltage supply
and meters as shown in Figure 1.
4. Turn on input power supply. The output voltage meter
should display the selected output voltage ± 2%.
5. Once the proper output voltage is established, adjust
the load current within the 0A – 1.2A range and
observe the load regulation, efficiency, and other
parameters. Output voltage ripple should be mea-
sured across C12 with a BNC cable terminated into
50Ω and an oscilloscope.
6. To observe BURST light load efficiency, place the Mode
pin jumper (JP2) in the BURST position.
7. An external clock can be added to the SYNC terminal
when the SYNC function is used (JP2 on the SYNC posi-
tion). Please ensure the chosen RT sets the LTM8074
switching frequency to equal or below the lowest sync
frequency.
8. A spread spectrum mode is available by moving the
Mode pin jumper (JP2) in the SPREAD position.
The spread spectrum modulation frequency is set to
be3kHz.
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DEMO MANUAL DC2753A
UG-1365 Rev. 0
QUICK START PROCEDURE
OUTPUT CURRENT (A)
0
0.20
0.40
0.60
0.80
1.00
1.20
82
83
84
85
86
87
88
89
90
91
92
EFFICIENCY (%)
DC2753A F02
5V, 2MHz
3.3V, 2MHz
DC2753A F03
VOUT
100mV/DIV
VOUT_STEP
1A/DIV
0.6A DC
DC2753A F04
VOUT
10mV/DIV
Figure 2. Measured Supply Efficiency at 12VIN
Figure 3. Measured Load Transient Response
(0.6A – 1.2A Load Step)
Figure 4. Measured VOUT Ripple
Figure 5. Measured Case Temperature
VIN (V) VOUT (V) COUT
12 3.3 1μF × 47μF/16V + 1μF × 4.7μF/16V
VIN (V) VOUT (V) IOUT (A) COUT
12 3.3 1.2 1μF × 47μF/16V + 1μF × 4.7μF/16V
VIN (V) VOUT (V) ILOAD (A) fSW (MHz) TAMBIENT (°C) Forced Airflow (LFM)
12 5 1.2 2 25 0
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DEMO MANUAL DC2753A
UG-1365 Rev. 0
Figure 6. LTM8074 Demo Circuit EMI Performance, without EMI Filter, in CISPR22 Radiated
Emission Test, Antenna Polarization: Vertical, 3 Meters (VIN = 12V, VOUT = 3.3V, IOUT = 1.2A,
2MHz Switching Frequency)
Figure 7. LTM8074 Demo Circuit EMI Performance, without EMI Filter, in CISPR22 Radiated
Emission Test, Antenna Polarization: Vertical, 3 Meters (VIN = 24V, VOUT = 3.3V, IOUT = 1.2A,
2MHz Switching Frequency)
QUICK START PROCEDURE
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DEMO MANUAL DC2753A
UG-1365 Rev. 0
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 C3, C6 CAP., X7R, 4.7μF, 50V, 10% 1206 MURATA, GRM31CR71H475KA12L
2 1 C9 CAP., X5R, 0.01μF, 50V, 10%, 0603 AVX, 06035C103KAT2A
3 1 C12 CAP., X7R, 47μF, 10V, 10%, 1210 MURATA, GRM32ER71A476KE20L
4 1 R4 RES., 76.8k, 1%, 0603 VISHAY, CRCW060376K8FKEA
5 1 U1 IC, LTM8074EY, BGA-25-4×4-1566 ANALOG DEVICES, LTM8074EY#PBF
Additional Demo Board Circuit Components
1 1 C1 CAP., X7R, 1μF, 50V, 10%, 0805 TDK, C2012X7R1H105K
2 1 C2, C5 CAP., X7R, 0.1μF, 50V, 10%, 0603 MURATA, GRM188R71H104KA93D
3 1 L1 RES., CHIP., 0Ω, 3/4W,2010 VISHAY, CRCW20100000Z0EF
4 1 FB1 FERRITE BEAD, 220Ω, 0805 TDK, MPZ2012S221AT000
5 1 C5 CAP., X7R, 0.1μF, 50V, 10%, 0603 MURATA, GRM188R71H104KA93D
6 2 C7, C8 CAP., X7R, 4.7μF, 50V, 10% 1206 MURATA, GRM31CR71H475KA12L
7 1 C4 CAP., ALUM, 22μF, 63V SUN ELECT, 63CE22BS
8 0 C10, C11 CAP., OPT, 1210 OPT
9 1 C13 CAP., X7R, 4.7μF, 16V, 10%, 0805 MURATA, GRM21BR71C475K73L
10 0 C14 CAP., OPT, 0603 OPT
11 3 C15, C16, C17 CAP., X7R, 1.0μF, 25V, 10%, 0603 MURATA, GRM188R71E105KA12D
12 1 D1 DIODE, ZENER, 3.6V, SOD323 CENTRAL SEMI, CMDZ3L6 TR
13 1 Q1 XSTR., MOSFET, N-CH, 30V, SOT23 VISHAY, Si2338DS-T1-GE3
14 1 RS1 SENSE RES, 0.05Ω, 1W, 1%, 1206 VISHAY, WSLP1206R0500FEA
15 1 R1 RES., 1MEG, 1%, 0603 VISHAY, CRCW06031M00FKEA
16 2 R2, R7 RES., 100k, 1%, 0603 VISHAY,CRCW0603100KFKEA
17 1 R3 RES., 18.2k, 1%, 0603 VISHAY, CRCW060318K2FKEA
18 1 R5 RES., 45.3k, 1%, 0603 VISHAY, CRCW060345K3FKEA
19 1 R6 RES., 17.4k, 1%, 0603 VISHAY, CRCW060317K4FKEA
20 0 R8 RES., OPT, 0603 OPT
21 1 R9 RES., 10k, 1%, 0603 VISHAY, CRCW060310KFKEA
Hardware
1 10 E1-E10 TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0
2 3 JP3, JP4, JP5 CONN., HEADER, 1mm × 2mm, 2mm WURTH ELEKTRONIK, 62000211121
3 1 JP2 CONN., HEADER, 2mm × 4mm, 2mm WURTH ELEKTRONIK, 62000821121
4 1 JP1 CONN., HEADER, 1mm × 3mm, 2mm WURTH ELEKTRONIK, 62000311121
5 3 JP1, JP2, JP3 SHUNT, 2mm WURTH ELEKTRONIK, 608 002 134 21
6 2 J5, J6 CONN, BNC, 5 PINS CONNEX, 112404
7 4 (STAND-OFF) STAND-OFF, SNAP ON NYLON 0.50" TALL KEYSTONE, 8833(SNAP ON)
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DEMO MANUAL DC2753A
UG-1365 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
STEP DOWN SILENT SWITCHER µMODULE REGULATOR
710-DC2753A_REV04
STEP DOWN SILENT SWITCHER µMODULE REGULATOR
710-DC2753A_REV04
STEP DOWN SILENT SWITCHER µMODULE REGULATOR
710-DC2753A_REV04
+
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DEMO MANUAL DC2753A
UG-1365 Rev. 0
ANALOG DEVICES, INC. 2018
UG16994-0-10/18(0)
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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