DEMO MANUAL DC2753A LTM8074 1.2A Step-Down Silent Switcher Module Regulator DESCRIPTION Demonstration circuit 2753A features the LTM(R)8074EY Module regulator, a tiny high performance high efficiency step-down regulator with Silent Switcher(R) 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 x 4mm x 1.82mm BGA package requiring only a few input and output capacitors. 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 conducted EMI filter, the input should be tied to VEMI, not VIN. An inductor L2, which is a 0 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. All registered trademarks and trademarks are the property of their respective owners. PERFORMANCE SUMMARY PARAMETER Specifications are at TA = 25C 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 2 BOARD PHOTO UG-1365 Rev. 0 1 DEMO MANUAL DC2753A QUICK START PROCEDURE Demonstration circuit 2753A is an easy way to evaluate the performance of the LTM8074EY. Please refer to Figure 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 Select ON PS 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 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 measured across C12 with a BNC cable terminated into 50 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 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 the Mode pin jumper (JP2) in the SPREAD position. The spread spectrum modulation frequency is set to be 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. 0 3 DEMO MANUAL DC2753A QUICK START PROCEDURE 92 91 EFFICIENCY (%) 90 89 88 87 86 85 84 5V, 2MHz 3.3V, 2MHz 83 82 0 0.20 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/DIV VOUT_STEP 1A/DIV 0.6A DC DC2753A F04 DC2753A F03 VIN (V) VOUT (V) COUT VIN (V) VOUT (V) IOUT (A) COUT 12 3.3 1F x 47F/16V + 1F x 4.7F/16V 12 3.3 1.2 1F x 47F/16V + 1F x 4.7F/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) 12 5 1.2 2 25 0 Figure 5. Measured Case Temperature 4 UG-1365 Rev. 0 DEMO MANUAL DC2753A QUICK START PROCEDURE 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) UG-1365 Rev. 0 5 DEMO MANUAL DC2753A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 2 C3, C6 CAP., X7R, 4.7F, 50V, 10% 1206 MURATA, GRM31CR71H475KA12L 2 1 C9 CAP., X5R, 0.01F, 50V, 10%, 0603 AVX, 06035C103KAT2A 3 1 C12 CAP., X7R, 47F, 10V, 10%, 1210 MURATA, GRM32ER71A476KE20L 4 1 R4 RES., 76.8k, 1%, 0603 VISHAY, CRCW060376K8FKEA 5 1 U1 IC, LTM8074EY, BGA-25-4x4-1566 ANALOG DEVICES, LTM8074EY#PBF Additional Demo Board Circuit Components 1 1 C1 CAP., X7R, 1F, 50V, 10%, 0805 TDK, C2012X7R1H105K 2 1 C2, C5 CAP., X7R, 0.1F, 50V, 10%, 0603 MURATA, GRM188R71H104KA93D 3 1 L1 RES., CHIP., 0, 3/4W, 2010 VISHAY, CRCW20100000Z0EF 4 1 FB1 FERRITE BEAD, 220, 0805 TDK, MPZ2012S221AT000 5 1 C5 CAP., X7R, 0.1F, 50V, 10%, 0603 MURATA, GRM188R71H104KA93D 6 2 C7, C8 CAP., X7R, 4.7F, 50V, 10% 1206 MURATA, GRM31CR71H475KA12L 7 1 C4 CAP., ALUM, 22F, 63V SUN ELECT, 63CE22BS 8 0 C10, C11 CAP., OPT, 1210 OPT 9 1 C13 CAP., X7R, 4.7F, 16V, 10%, 0805 MURATA, GRM21BR71C475K73L 10 0 C14 CAP., OPT, 0603 OPT 11 3 C15, C16, C17 CAP., X7R, 1.0F, 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, 0.05, 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 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 x 2mm, 2mm WURTH ELEKTRONIK, 62000211121 3 1 JP2 CONN., HEADER, 2mm x 4mm, 2mm WURTH ELEKTRONIK, 62000821121 4 1 JP1 CONN., HEADER, 1mm x 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) Hardware 6 UG-1365 Rev. 0 A B C 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. 5 4 + 3 3 4 D 5 2 1 710-DC2753A_REV04 STEP DOWN SILENT SWITCHER MODULE REGULATOR 1 2 A B C D DEMO MANUAL DC2753A SCHEMATIC DIAGRAM UG-1365 Rev. 0 7 DEMO MANUAL DC2753A 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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