DEMO MANUAL DC2753A
LTM8074
1.2A Step-Down Silent SwitcherµModule Regulator
DESCRIPTION
Demonstration circuit 2753A features the LTM®8074EYµModule 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 to1.2A. The output voltage can be programmed from 0.78V
up to 15V. The LTM8074EY is a complete DC/DC pointof load regulator in a thermally enhanced 4mm × 4mm× 1.82mm BGA package requiring only a few input andoutput capacitors.

The radiated EMI performances of the board (with EMIfilter) are shown in Figure 6 and Figure 7. The demo board
also has a conducted EMI filter installed. To use the conducted EMI filter, the input should be tied to VEMI, 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 withthis demo manual for working on or modifying DC2753A.
Design files for this circuit board are available.
All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARYPARAMETER

Specifications are at TA = 25°C

CONDITIONS/NOTES

Input Voltage Range

VALUE
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
Efficiency

2MHz
VIN = 12V, VOUT = 5V, IOUT = 1.2A

89% See Figure 2BOARD PHOTO

UG-1365 Rev. 01

DEMO MANUAL DC2753A
QUICK START PROCEDURE
Demonstration circuit 2753A is an easy way to evaluate the performance of the LTM8074EY. Please refer toFigure 1 for test setup connections and follow the procedure below.
1. With power off, place the jumpers in the following positions for a typical 3.3VOUT application:
JP1

JP2

JP3

RUN

MODE

VOUT SelectONPS

3.3V

2. Before connecting input supply, load and meters, preset 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.

2

4. Turn on input power supply. The output voltage metershould display the selected output voltage ± 2%.
5. Once the proper output voltage is established, adjust
the load current within the 0A – 1.2A range andobserve the load regulation, efficiency, and otherparameters. Output voltage ripple should be measured across C12 with a BNC cable terminated into50Ω and an oscilloscope.
6. To observe BURST light load efficiency, place the Modepin 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 position). 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 theMode pin jumper (JP2) in the SPREAD position.
The spread spectrum modulation frequency is set tobe 3kHz.

UG-1365 Rev. 0

DEMO MANUAL DC2753A
QUICK START PROCEDURE+–LOAD– 0A –1.2A +–+DC2753A F01–+VIN+–+–Figure 1. Test Setup

UG-1365 Rev. 03

DEMO MANUAL DC2753A
QUICK START PROCEDURE
9291

EFFICIENCY (%)

90
89
88
87
86
85
84
5V, 2MHz
3.3V, 2MHz

83
82

00.20

0.40 0.60 0.80 1.00
OUTPUT CURRENT (A)

1.20

DC2753A F02

Figure 2. Measured Supply Efficiency at 12VIN

VOUT
100mV/DIV

VOUT
10mV/DIVVOUT_STEP
1A/DIV
0.6A DC

DC2753A F04

DC2753A F03

VIN (V)

VOUT (V)COUT

VIN (V)

VOUT (V)IOUT (A)

COUT

123.3

1μF × 47μF/16V + 1μF × 4.7μF/16V

123.3

1.21μF × 47μF/16V + 1μF × 4.7μF/16V

Figure 3. Measured Load Transient Response(0.6A – 1.2A Load Step)

Figure 4. Measured VOUT Ripple

VIN (V)

VOUT (V)ILOAD (A)fSW (MHz)TAMBIENT (°C)

Forced Airflow (LFM)

1251.22250Figure 5. Measured Case Temperature

4UG-1365 Rev. 0DEMO MANUAL DC2753A
QUICK START PROCEDUREFigure 6. LTM8074 Demo Circuit EMI Performance, without EMI Filter, in CISPR22 RadiatedEmission 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 RadiatedEmission Test, Antenna Polarization: Vertical, 3 Meters (VIN = 24V, VOUT = 3.3V, IOUT = 1.2A,2MHz Switching Frequency)

UG-1365 Rev. 05

DEMO MANUAL DC2753A
PARTS LIST
ITEM

QTY

REFERENCE

PART DESCRIPTIONMANUFACTURER/PART NUMBERRequired Circuit Components
12C3, C6CAP., X7R, 4.7μF, 50V, 10% 1206

MURATA, GRM31CR71H475KA12L

21C9CAP., X5R, 0.01μF, 50V, 10%, 0603

AVX, 06035C103KAT2A

31C12CAP., X7R, 47μF, 10V, 10%, 1210

MURATA, GRM32ER71A476KE20L

41R4RES., 76.8k, 1%, 0603

VISHAY, CRCW060376K8FKEA

51U1IC, LTM8074EY, BGA-25-4×4-1566

ANALOG DEVICES, LTM8074EY#PBF

Additional Demo Board Circuit Components
11C1CAP., X7R, 1μF, 50V, 10%, 0805

TDK, C2012X7R1H105K

21C2, C5CAP., X7R, 0.1μF, 50V, 10%, 0603

MURATA, GRM188R71H104KA93D

31L1RES., CHIP., 0Ω, 3/4W, 2010

VISHAY, CRCW20100000Z0EF

41FB1FERRITE BEAD, 220Ω, 0805

TDK, MPZ2012S221AT000

51C5CAP., X7R, 0.1μF, 50V, 10%, 0603

MURATA, GRM188R71H104KA93D

62C7, C8CAP., X7R, 4.7μF, 50V, 10% 1206

MURATA, GRM31CR71H475KA12L

71C4CAP., ALUM, 22μF, 63V

SUN ELECT, 63CE22BS

80C10, C11CAP., OPT, 1210

OPT91C13CAP., X7R, 4.7μF, 16V, 10%, 0805

MURATA, GRM21BR71C475K73L

100C14CAP., OPT, 0603

OPT113C15, C16, C17CAP., X7R, 1.0μF, 25V, 10%, 0603

MURATA, GRM188R71E105KA12D

121

D1

DIODE, ZENER, 3.6V, SOD323

CENTRAL SEMI, CMDZ3L6 TR

131Q1

XSTR., MOSFET, N-CH, 30V, SOT23

VISHAY, Si2338DS-T1-GE3141

RS1SENSE RES, 0.05Ω, 1W, 1%, 1206

VISHAY, WSLP1206R0500FEA

151R1RES., 1MEG, 1%, 0603

VISHAY, CRCW06031M00FKEA

162R2, R7RES., 100k, 1%, 0603

VISHAY,CRCW0603100KFKEA

171R3RES., 18.2k, 1%, 0603

VISHAY, CRCW060318K2FKEA

181R5RES., 45.3k, 1%, 0603

VISHAY, CRCW060345K3FKEA

191R6RES., 17.4k, 1%, 0603

VISHAY, CRCW060317K4FKEA

200R8RES., OPT, 0603

OPT

211R9RES., 10k, 1%, 0603

VISHAY, CRCW060310KFKEA

110E1-E10

TESTPOINT, TURRET, 0.094" PBF

MILL-MAX, 2501-2-00-80-00-00-07-0

23JP3, JP4, JP5

CONN., HEADER, 1mm × 2mm, 2mmWURTH ELEKTRONIK, 62000211121

31JP2CONN., HEADER, 2mm × 4mm, 2mm

WURTH ELEKTRONIK, 62000821121

41JP1CONN., HEADER, 1mm × 3mm, 2mm

WURTH ELEKTRONIK, 62000311121

53JP1, JP2, JP3

SHUNT, 2mm

WURTH ELEKTRONIK, 608 002 134 21

62J5, J6CONN, BNC, 5 PINSCONNEX, 112404

74(STAND-OFF)

STAND-OFF, SNAP ON NYLON 0.50" TALL

KEYSTONE, 8833(SNAP ON)

Hardware

6UG-1365 Rev. 0ABCInformation furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by AnalogDevices 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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D




52 1 

710-DC2753A_REV04

STEP DOWN SILENT SWITCHER µMODULE REGULATOR1  

2ABCDDEMO MANUAL DC2753A

SCHEMATIC DIAGRAM

UG-1365 Rev. 07

DEMO MANUAL DC2753AESD 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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Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF
LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLYDISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THEIMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITSLICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDINGBUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE
HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United Statesfederal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts(excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits
to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

8UG-1365 Rev. 0
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 ANALOG DEVICES, INC. 2018