DEMO MANUAL DC2659A LTM4671 Quad Output (Dual 12A, Dual 5A) Step-Down Module Regulator DESCRIPTION Demonstration circuit 2659A features the LTM(R)4671 Module(R) regulator, a high performance high efficiency four output step-down regulator. The LTM4671EY has an operating input voltage range of 3.6V to 20V providing up to 12A from each of its two higher current rails and up to 5A from each of its two lower current rails. The two higher current rails' output voltage is programmable from 0.6V to 3.3V while the two lower current rails' output voltage is programmable from 0.6V to 5.5V. High current rails can be paralleled together, and lower current rails can be paralleled together to satisfy higher rail current requirements. The LTM4671EY is a complete multi-output DC-DC point-of-load regulator in a thermally enhanced 16mm x 9.5mm x 4.82mm BGA package requiring only a few input and output capacitors. Output voltage tracking is made available by the TRACK/SS pins for supply rail sequencing. Temperature sensing options are included via the TSENSE and TMON pins. External clock synchronization is available through the CLKIN pins, CLKOUT pins provide for optional synchronization of additional module phases. The LTM4671 data sheet must be read in conjunction with this demo manual for working on or modifying demo circuit 2659A Design files for this circuit board are available. All registered trademarks and trademarks are the property of their respective owners. BOARD PHOTO Rev. 0 1 DEMO MANUAL DC2659A PERFORMANCE SUMMARY PARAMETER Specifications are at TA = 25C CONDITIONS/NOTES VALUE Input Voltage Range 3.6V - 20V Output Voltage VOUT Jumper Selectable VOUT0 = 1.2VDC, VOUT1 = 2.5VDC, VOUT2 = 3.3VDC, VOUT4 = 1VDC Maximum Continuous Output Current per Phase De-Rating is Necessary for Certain Operating Conditions. See Data Sheet for Details IOUT0MAX, IOUT3MAX = 12ADC IOUT1MAX, IOUT2MAX = 5ADC Default Operating Frequency 600kHz (for VOUT0, VOUT3) 1MHz (for VOUT1, VOUT2) Efficiency VIN = 12V VOUT0 = 1.2V, IOUT = 12A VOUT0 = 3.3V, IOUT = 5A See Figure 2 87.4% 91.6% QUICK START PROCEDURE Demonstration circuit 2659A is an easy way to evaluate the performance of the LTM4671EY. 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: JP1 JP2 JP3 JP4 RUN0 RUN1 RUN2 RUN3 ON ON ON ON JP5 JP6 JP7 MODE0 MODE1 MODE3 CCM CCM CCM 2.Before connecting input supply, loads and meters, preset the input voltage supply to be between 4V to 20V. Preset the load currents to 0A. 3.With power off, connect the loads, input voltage supply and meters as shown in Figure 1. 4.Turn on input power supply. The output voltage meters for each phase should display the programmed output voltage 2%. 5.Once the proper output voltages are established, adjust the load currents for each phase within the 0A-12A 2 range for VOUT0 and VOUT3 outputs and within 0A-5A for VOUT1 and VOUT2 outputs. Observe each output's load regulation, efficiency, and other parameters. Output voltage ripples for each output should be measured across the furthest output capacitor with a BNC cable and oscilloscope. BNCs J5 and J9 are available for VOUT0 and VOUT2 ripple measurements, respectively. 6.To observe increased light load efficiency, for VOUT0 and VOUT3 place the MODE pin jumpers (JP5, JP7) in the DCM position, for VOUT1 and VOUT2 place the MODE pin jumper (JP6) in the BURST position. 7.For optional load transient testing on-board transient circuits are provided to measure transient responses on VOUT0 and VOUT2 outputs. Place a positive pulse signal between the IOSTEPx_CLK pin and GND pins. The pulse amplitude sets the load step current amplitude. The pulse width should be short (<1ms) and pulse duty cycle should be low (<15%) to limit the thermal stress on the load transient circuit. The load step response for VOUT0 and VOUT2 can be monitored with a BNC connected to J4 (10mV/A) and J7 (20mV/A), respectively. Rev. 0 DEMO MANUAL DC2659A QUICK START PROCEDURE Figure 1. Test Setup of DC2659A Rev. 0 3 DEMO MANUAL DC2659A 97 97 95 95 93 93 91 91 EFFICIENCY (%) EFFICIENCY (%) QUICK START PROCEDURE 89 87 85 83 81 77 75 0 1 2 3 87 85 83 81 1.2VOUT0 2.5VOUT1 3.3VOUT2 1VOUT3 79 89 1.2VOUT0 2.5VOUT1 3.3VOUT2 1VOUT3 79 77 75 4 5 7 8 9 10 11 12 LOAD CURRENT (A) 0 1 2 3 4 5 7 8 9 10 11 12 LOAD CURRENT (A) DC2659A F02a DC2659A F02b (a) 5VIN CCM Efficiency (b) 12VIN CCM Efficiency Figure 2. Measured Supply Efficiency at 5VIN and 12VIN VOUT0: 20mV/DIV VOUT3: 20mV/DIV IOUT0_STEP: 5A/DIV IOUT3_STEP: 5A/DIV VIN (V) VOUT0 (V) COUT CERAMIC VIN (V) VOUT3 (V) COUT CERAMIC 12 1.2 2 x 100F/6.3V/Ceramic +1 x 330F/6.3V/Bulk 12 1 2 x 100F/6.3V/Ceramic +1 x 330F/6.3V/Bulk Figure 3. Measured VOUT0 = 1.2V and VOUT3 = 1V Load Transient Responses (6A Load Step) 4 Rev. 0 DEMO MANUAL DC2659A QUICK START PROCEDURE VOUT1: 100mV/DIV VOUT2: 100mV/DIV IOUT1_STEP: 2A/DIV IOUT2_STEP: 5A/DIV VIN (V) VOUT1 (V) COUT CERAMIC VIN (V) VOUT2 (V) COUT CERAMIC 12 2.5 2 x 47F/6.3V/Ceramic +1 x 10F/6.3V/Ceramic 12 3.3 2 x 47F/6.3V/Ceramic +1 x 10F/6.3V/Ceramic Figure 4. Measured VOUT1 = 2.5V and VOUT2 =3.3V Load Transient Responses (2.5A Load Step) VIN (V) AIRFLOW HEATSINK AMBIENT (C) VIN (V) AIRFLOW HEATSINK AMBIENT (C) 12 Natural Convection None 23 12 Forced Air 200LFM None 23 CHANNEL VOUT0 VOUT1 VOUT2 VOUT3 CHANNEL VOUT0 VOUT1 VOUT2 VOUT3 VOUT (V) 1.2 2.5 3.3 1 VOUT (V) 1.2 2.5 3.3 1 IOUT (A) 10 4 4 10 IOUT (A) 12 5 5 12 Figure 5. Measured Thermal Captures Rev. 0 5 DEMO MANUAL DC2659A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 4 C2, C3, C4, C5 CAP., 22F, X5R, 25V, 20%, 1206 MURATA, GRM31CR61E226ME15L 2 2 C8, C35 CAP., 100F, X5R, 6.3V, 20%, 1210 TDK, C3225X5R0J107M250AC 3 2 C18, C28 CAP., 47F, X5R, 16V, 20%, 1206 TDK, C3216X5R1C476M160AB 4 1 R4 RES., 60.4k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060360K4FKEA 5 1 R13 RES., 19.1k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060319K1FKEA 6 1 R29 RES., 13.3k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060313K3FKEA 7 1 R39 RES., 90.9k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060390K9FKEA 8 1 U1 IC, QUAD HIGH EFFICIENCY MODULE, BGA-16mm x 9.5mm x 4.72mm ANALOG DEVICES., LTM4671EY#PBF Additional Demo Board Circuit Components 1 2 C7, C34 CAP., 330F, ALUM. ELECT., 2.5V, 20%, 7343, 9m, 6.3A PANASONIC, EEFSX0E331ER 2 2 C9, C36 CAP., 100F, X5R, 6.3V, 20%, 1206 TDK, C3216X5R0J107M160AB 3 2 C17, C27 CAP., 10F, X5R, 16V, 10%, 0805 MURATA, GRM21BR61C106KE15L 4 2 C19, C29 CAP., 47F, X5R, 16V, 20%, 1206 TDK, C3216X5R1C476M160AB 5 2 C20, C30 CAP., 22pF, C0G, 50V, 5%, 0603 MURATA, GRM1885C1H220JA01J 6 2 C12, C39 CAP., 330pF, C0G, 50V, 5%, 0603 MURATA, GRM1885C1H331JA01J 7 2 C15, C32 CAP., 0.1F, X7R, 50V, 10%, 0603 TDK, C1608X7R1H104K080AA 8 1 C1 CAP., 100F, TANT. POLY., 25V, 20%, 7343 KEMET, T521X107M025ATE060 9 1 C6 CAP., 1F, X5R, 16V, 10%, 0603 MURATA, GRM188R61C105KA93D 10 2 C22, C25 CAP., 0.01F, X7R, 50V, 10%, 0603 KEMET, C0603C103K5RACTU 11 4 C40, C43, C45, C47 CAP., 1F, X7R, 16V, 20%, 0603 TDK, C1608X7R1C105M080AC 12 2 C42, C46 CAP., 1F, X7R, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L 13 2 Q1, Q2 XSTR., MOSFET, N-CH, 40V, TO-252 (DPAK) VISHAY, SUD50N04-8M8P-4GE3 14 16 R1, R3, R6, R7, R11, R15, R28, R31, R35, R36, R74, R75, R76, R77, R80, R81 RES., 0, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA 15 10 R2, R5, R12, R16, R26, R32, R18, R20, R22, R24 RES., 100k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603100KFKEA 16 4 R50, R51, R82, R83 RES., 1k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06031K00FKEA 17 2 R54, R69 RES., 10k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060310K0FKEA 18 1 R55 RES., 0.01, 1%, 1/2W, 2010, SENSE, AEC-Q200 VISHAY, WSL2010R0100FEA 19 1 R70 RES., 0.02, 1%, 1/2W, 2010, SENSE, AEC-Q200 VISHAY, WSL2010R0200FEA 6 Rev. 0 DEMO MANUAL DC2659A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Hardware 1 25 E1, E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12, E13, E14, E15, E16, E17, E18, E19, E20, E21, E22, E23, E24, E25 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0 2 6 J1, J2, J3, J10, J11, J12 CONN.,BANANA JACK, FEMALE, THT, NON-INSULATED, SWAGE KEYSTONE, 575-4 3 4 JP1, JP2, JP3, JP4 CONN., HDR, MALE, 1mm x3mm x 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000311121 4 4 J4, J5, J7, J9 CONN., RF, BNC, RCPT JACK, 5-PIN, STR, THT, 50 AMPHENOL RF, 112404 5 2 JP5, JP7 CONN., HDR, MALE, 2mm x 2mm x 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000421121 6 1 JP6 CONN., HDR, MALE, 2mm x 3mm x 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000621121 7 4 MH1, MH2, MH3, MH4 STANDOFF, NYLON, SNAP-ON, 0.375" KEYSTONE, 8832 8 7 XJP1, XJP2, XJP3, XJP4, XJP5, XJP6, XJP7 CONN., SHUNT, FEMALE, 2-POS,2mm WURTH ELEKTRONIK, 60800213421 Rev. 0 7 A B C D E 5 4 4 + 3 1 710-DC2659A_REV04 QUAD OUTPUT STEP DOWN uMODULE REGULATOR - DUAL12A, DUAL5A 1 + 2 2 + 3 8 5 A B C D E DEMO MANUAL DC2659A SCHEMATIC DIAGRAM Rev. 0 5 4 GND 3 DO NOT EXCEED 5% DUTY CYCLE! DYNAMIC LOAD CIRCUITS GND DO NOT EXCEED 5% DUTY CYCLE! C D 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. 2 1 710-DC2659A_REV04 uMODULE REGULATOR - DUAL12A, DUAL5A QUAD OUTPUT STEP DOWN A 1 A 2 B 3 B C D 4 5 DEMO MANUAL DC2659A SCHEMATIC DIAGRAM Rev. 0 9 DEMO MANUAL DC2659A 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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