DEMO MANUAL DC1889A LTM4624EY 4A Step-Down Module Regulator Description Demonstration circuit 1889A features the LTM(R)4624EY Module(R) regulator, a tiny high performance high efficiency step-down regulator. The LTM4624EY has an operating input voltage range of 4V to 14V and is able to provide an output current of up to 4A. The output voltage is programmable from 0.6V to 5.5V. The LTM4624EY is a complete DC/DC point-of-load regulator in a thermally enhanced 6.25mm x 6.25mm x 5.01mm BGA package requiring only a couple capacitors and a resistor. Output Performance Summary PARAMETER voltage tracking is available through the TRACK/SS pin for supply rail sequencing. The LTM4624 data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit 1889A. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology, the Linear logo and Module are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Specifications are at TA = 25C CONDITIONS/NOTES Input Voltage Range VALUE 4V - 14V Output Voltage, VOUT Jumper Selectable 1.0VDC, 1.2VDC, 1.5VDC, 1.8VDC, 2.5VDC, 3.3VDC, 5VDC Maximum Continuous Output Current Derating is Necessary for Certain operating Conditions. See Data Sheet for Details 4A DC Default Operating Frequency Efficiency 1MHz VIN = 12V, VOUT = 1.8V, IOUT = 4A 83.6% See Figure 2 Board Photo dc1889af 1 DEMO MANUAL DC1889A Quick Start Procedure Demonstration circuit 1889A is an easy way to evaluate the performance of the LTM4624EY. Please refer to Figure 1 for test setup connections and follow the procedure below. 5.Once the proper output voltage is established, adjust the load current within the 0A to 4A range and observe the load regulation, efficiency, and other parameters. Output voltage ripple should be measured at J6 with a BNC cable terminated into 50 and an oscilloscope. 1.With power off, place the jumpers in the follow-ing positions for a typical 1.8Vout application: JP7 JP6 JP4 RUN MODE VOUT Select ON CCM 1.8V 6.To observe increased light load efficiency place the MODE pin jumper (JP6) in the DCM position while input power is removed. 7.For optional load transient testing apply an adjustable positive pulse signal between IOSTEP CLK 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 current can be monitored with a BNC connected to J5 (50mV/A). 2.Before connecting input supply, load and meters, preset the input voltage supply to be between 4V to 14V. Pre-set the load current to 0A. 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%. - - + A - - + VIN A + V + LOAD 0A TO 4A + - + V - Figure 1. Test Setup dc1889af 2 DEMO MANUAL DC1889A Quick Start Procedure 12VIN CCM Efficiency vs Load Current 5VIN CCM Efficiency vs Load Current 95 95 90 5VOUT 3.3VOUT 2.5VOUT 1.8VOUT 1.5VOUT 1.2VOUT 1VOUT 85 80 75 0 1 2 3 EFFICIENCY (%) EFFICIENCY (%) 90 3.3VOUT 2.5VOUT 1.8VOUT 1.5VOUT 1.2VOUT 1VOUT 85 80 75 4 0 2 1 LOAD CURRENT (A) 3 4 LOAD CURRENT (A) Figure 2. Measured Supply Efficiency at 12VIN and 5VIN VOUT 50mV/DIV VOUT 10mV/DIV IOUT(STEP) 2A/DIV VIN (V) VOUT (V) 12 1.8 COUT 1 x 100F/6.3V+ 1 x 22F/6.3V+ 1 x 47F/6.3V Figure 3. Measured Load Transient Response (2A to 4A Load Step) VIN (V) VOUT (V) 12 1.8 iOUT (A) 4 COUT 1 x 100F/6.3V+ 1 x 22F/6.3V+ 1 x 47F/6.3V Figure 4. Measured VOUT Ripple (20MHz) dc1889af 3 DEMO MANUAL DC1889A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 1 C1 CAP., X5R, 2.2F, 10V, 10%, 0603 TAIYO YUDEN, LMK107BJ225KA-T 2 2 C3, C13 CAP., X5R, 22F, 16V, 20%, 1206 TAIYO YUDEN, EMK316BJ226ML-T 3 1 C20 CAP., X5R, 47F, 6.3V, 20%,1206 TAIYO YUDEN, JMK316BJ476ML 4 1 C12 CAP., X5R, 100F, 6.3V, 20%,1210 TAIYO YUDEN, JMK325ABJ107MM-T 5 2 C9, C15 CAP., X5R, 0.1F, 25V, 10%, 0603 AVX, 06033D104KAT 6 1 R4 RES., CHIP, 90.9k, 1/16W, 1%, 0603 VISHAY, CRCW060390K9FKEA 7 1 R11 RES., CHIP, 10, 1/16W, 1%, 0603 VISHAY, CRCW060310R0FKEA 8 1 U1 I.C., LTM4624EY, BGA LINEAR TECH., LTM4624EY#PBF Additional Demo Board Circuit Components 1 1 C10 CAP., X5R, 22F, 25V, 10%, 7343 SANYO, 25TQC22MV 2 0 C11, C14 CAP., 1210, OPTION OPTION 3 0 C5 CAP., 1206, OPTION OPTION 4 3 C4, C6, C18 CAP., X5R, 1F, 10V, 10%, 0603, OPTION TAIYO YUDEN, LMK107BJ105KA-T 5 0 C7, C19 CAP., 0603, OPTION OPTION 6 0 C17 CAP., 7343, OPTION OPTION 7 1 C2 CAP., X5R, 10F, 16V, 20%, 0805 TAIYO YUDEN, EMK212ABJ106KG-T 8 1 C16 CAP., X5R, 22F, 6.3V, 20%, 0805 TAIYO YUDEN, JMK212ABJ226MD-T 9 1 C8 CAP., X7R, 100pF, 50V, 10%, 0603 AVX, 06033C101KAT2A 10 1 Q1 N-Channel 30-V MOSFET,TO-252 VISHAY, SUD50N03-09P-E3 11 1 RS2 RES., CHIP, 0.05, 1W, 1%, 2512 VISHAY, WSL2512R0500FEB 12 1 R3 RES., CHIP, 10k, 1/16W, 1%, 0603 VISHAY, CRCW060310K0FKEA 13 7 R5, R6, R7, R14, R15, R16, R10 RES., CHIP, OPTION, 1/16W, 1%, 0603 OPTION 14 0 R1, R12, R2 RES., CHIP, OPTION, 1/16W, 1%, 0603 OPTION 15 1 R8 RES., CHIP, 100k, 1/16W, 1%, 0603 VISHAY, CRCW0603100KFKEA 16 1 R9 RES., CHIP, 150k, 1/16W, 1%, 0603 VISHAY, CRCW0603150KFKEA 17 1 R13 RES., CHIP, 0, 1/16W, 1%, 0603 VISHAY, CRCW06030000Z0EA 1 11 E2, E4-E13 TESTPOINT, TURRET, 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0 2 7 JP1-JP4, JP8-JP10 2MM SINGLE ROW HEADER, 2-PIN SAMTEC, TMM102-02-L-S 3 1 JP6 2MM DOUBLE ROW HEADER, 2X2 PIN SAMTEC, TMM-102-02-L-D 4 1 JP7 2MM SINGLE ROW HEADER, 3-PIN SAMTEC, TMM-103-02-L-S 5 2 J5, J6 CONN, BNC, 5 PINS CONNEX, 112404 6 3 JP1, JP6, JP7 SHUNT SAMTEC, 2SN-BK-G 7 4 STAND OFF STAND OFF, SNAP ON KEYSTONE_8832 Hardware dc1889af 4 DEMO MANUAL DC1889A Schematic Diagram dc1889af Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 5 DEMO MANUAL DC1889A DEMONSTRATION BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user's responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright (c) 2004, Linear Technology Corporation dc1889af 6 Linear Technology Corporation LT 0713 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2013