DEMO MANUAL DC2989A LTM4657 20Vin, 8A Step-Down Module(R) Regulator DESCRIPTION Demonstration circuit 2989A features the LTM4657 Module(R) regulator, a high performance, high efficiency step-down regulator. The LTC(R)4657 is a complete DC/DC point-of-load regulator in a thermally enhanced 6.25mm x 6.25mm x 3.87mm BGA package. The LTM4657 has an operating input voltage range of 3.1V to 20V and provides an output current up to 8A. 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. PERFORMANCE SUMMARY PARAMETER 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 DCM mode operation using the MODE jumper (JP7) in less noise sensitive applications. The LTM4657 data sheet must be read in conjunction with this demo manual for working on or modifying DC2989A. Design files for this circuit board are available. All registered trademarks and trademarks are the property of their respective owners. Specifications are at TA = 25C CONDITIONS Input Voltage Range VALUE 3.1V - 20V Output Voltage VOUT Jumper selectable 1VDC, 1.5VDC, 2.5VDC, 3.3VDC, 5VDC Maximum Continuous Output Current Derating is necessary for certain operating conditions. See datasheet for details 8ADC Default Operating Frequency Efficiency 500kHz VIN = 12V, VOUT = 1.5V, IOUT = 8A 88.3% BOARD PHOTO Rev. 0 1 DEMO MANUAL DC2989A QUICK START PROCEDURE Demonstration circuit 2989A is an easy way to evaluate the performance of the LTM4657. Please refer to Figure1 for test setup connections and follow the procedure below. 1.With power off, place the jumpers in the following positions: JUMPER POSITION FUNCTION JP8 JP7 JP6 RUN MODE VOUT SELECT ON CCM 1.5V 2.Before connecting input supply, load and meters, preset the input voltage supply to be between 3.1V to 20V. Preset the load current to 0A. 3.With power off, connect the load, input voltage supply and meters as shown in Figure1. 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 voltage is established, adjust the load current within the 0-8A range and observe the load regulation, efficiency, and other parameters. Output voltage ripple should be measured across the furthest output cap with a BNC cable and oscilloscope from J2. 6.To observe increased light load efficiency, place the MODE pin jumper (JP7) in the DCM position. 7.For optional load transient testing, an on-board transient circuit is provided to measure tran-sient response. Place a positive pulse signal between the IO_STEP_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 can be monitored with a BNC connected to J1 (5mV/A). Rev. 0 2 DEMO MANUAL DC2989A QUICK START PROCEDURE Figure1. Test Setup of DC2989A Rev. 0 3 DEMO MANUAL DC2989A QUICK START PROCEDURE 100 EFFICIENCY (%) 95 90 85 80 3.3VOUT, 1MHz 2.5VOUT, 800kHz 1.5VOUT, 650kHz 1VOUT, 500kHz 75 70 0 1 2 3 4 5 6 LOAD CURRENT (A) 7 8 95 EFFICIENCY (%) 90 85 80 75 5VOUT, 1.25MHz 3.3VOUT, 1MHz 2.5VOUT, 800kHz 1.5VOUT, 650kHz 1VOUT, 500kHz 70 65 0 1 2 3 4 5 6 LOAD CURRENT (A) 7 8 Figure2. Measured Supply Efficiency at 5VIN and 12VIN Rev. 0 4 DEMO MANUAL DC2989A QUICK START PROCEDURE IOUTSTEP 5A/DIV VOUTP 100mV/DIV 10s/DIV Figure3. Load Transient (4A to 8A) Response Waveform at 12VIN and 1.5Vout, 10s/div Figure4. Measured Thermal Capture at 12VIN and 1.5VOUT, 8AOUT at 25C Ambient with No Airflow Rev. 0 5 DEMO MANUAL DC2989A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 2 C1, C6 CAP, 2.2uF, X7R, 10V, 20%, 0603 TDK, C1608X7R1A225M080AC 2 3 C2, C13, C29 CAP, 22uF, X5R, 25V, 10%, 1206 AVX, 12063D226KAT2A 3 1 C4 CAP, 1uF, X7R, 25V, 10%, 0603 TAIYO YUDEN, TMK107B7105KA-T 4 2 C5, CB17 CAP, 100uF, X5R, 10V, 20%, 1206 TDK, C3216X5R1A107M160AC 5 1 C7 CAP, 0.1uF, X7R, 25V, 10%, 0603 AVX, 06033C104KAT2A 6 1 C8 CAP, 100pF, X7R, 25V, 5%, 0603 AVX, 06033C101JAT2A 7 1 C9 CAP, 470pF, X7R, 50V, 10%, 0603 AVX, 06035C471KAT2A 8 1 C10 CAP, 220uF, ALUM. ELECT., 35V SUN ELEC, 35HVH220M 9 1 C11 CAP, 100uF, X5R, 10V, 20%, 1210 KEMET, C1210C107M8PACTU 10 1 C18 CAP, 1uF, X7R, 10V, 20%, 0603 AVX, 0603ZC105MAT2A 11 1 Q1 XSTR, MOSFET, N-CH, 40V, TO-252 (DPAK) VISHAY, SUD50N04-8M8P-4GE3 12 1 R3 RES, 10k OHMS, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060310K0FKEA 13 1 R4 RES, 60.4k OHMS, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060360K4FKEA 14 1 R6 RES, 30.1k OHMS, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060330K1FKEA 15 1 R7 RES, 150k OHMS, 5%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ3GEYJ154V 16 2 R8, R16 RES, 100k OHMS, 1%, 1/10W, 0603 STACKPOLE, RMCF0603FG100K 17 2 R9, R10 RES, 10 OHMS, 1%, 1/10W, 0603 VISHAY, CRCW060310R0FKEA 18 1 R14 RES, 10.7k OHMS, 1%, 1/10W, 0603 NIC, NRC06F1072TRF 19 1 R15 RES, 15k OHMS, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW060315K0FKEA 20 1 R17 RES, 0 OHM, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06030000Z0EA 21 1 R21 RES, 6.65k OHMS, 1%, 1/10W, 0603 NIC, NRC06F6651TRF 22 1 RS2 RES, 0.005 OHM, 1%, 1W, 2512 VISHAY, WSL25125L000FEA 23 1 U1 IC, Step-Down uModule Reg, BGA-49 ANALOG DEVICES, LTM4657EY#PBF Additional Demo Board Circuit Components 1 0 C3, C12, C14, C16, C21, C30 CAP, OPTION, 1206 N/A 2 0 C15, C19 CAP, OPTION, 0603 N/A 3 0 C20, CA17 CAP, OPTION, 7343 N/A 4 0 C22-C24 CAP, OPTION, 0805 N/A 5 0 C25-C28 CAP, OPTION, 1210 N/A 6 0 L1 IND, OPTION, 1812 N/A 7 0 L2 IND, OPTION, COILCRAFT XAL7070 N/A 8 0 R1, R2, R5, R11-R13, R19, R20 RES, OPTION, 0603 N/A Hardware: For Demo Board Only 1 7 E1, E3, E5, E8-E10, E12 TEST POINT, TURRET, 0.064 MILL-MAX, 2308-2-00-80-00-00-07-0 2 4 E2, E4, E7, E13 BANANA JACK, FEMALE KEYSTONE, 575-4 3 2 E6, E11 TEST POINT, TURRET, 0.094 MILL-MAX, 2501-2-00-80-00-00-07-0 4 2 J1, J2 CONN, BNC, 5-PIN AMPHENOL RF, 112404 5 6 JP1-JP6 HEADER, 1x2, 2mm SULLINS, NRPN021PAEN-RC 6 1 JP7 HEADER, 2x3, 2mm SULLINS, NRPN032PAEN-RC 7 1 JP8 HEADER, 1x3, 2mm SAMTEC, TMM-103-02-L-S 8 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.50 KEYSTONE, 8833 9 3 XJP1, XJP7, XJP8 CONN, SHUNT, FEMALE, 2-POS, 2mm SAMTEC, 2SN-BK-G Rev. 0 6 DEMO MANUAL DC2989A SCHEMATIC DIAGRAM 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. 7 DEMO MANUAL DC2989A 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. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the "Evaluation Board"), you are agreeing to be bound by the terms and conditions set forth below ("Agreement") unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you ("Customer") and Analog Devices, Inc. ("ADI"), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term "Third Party" includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS 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 SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER'S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT 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 States federal 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. Rev. 0 8 02/20 www.analog.com ANALOG DEVICES, INC. 2020