DESCRIPTION Demonstration circuit 568A features the LTM 46A µmodule regulator, a tiny low profile high performance high efficiency dual step-down regulator. The LTM46A has an operating input voltage range of.6v to 0V and is able to provide an output current of up to A for each channel. Each output s voltage is programmable from.5v to V. The LTM46A is a complete DC/DC point of load regulator in a low profile thermally enhanced 6.5mm 6.5mm.8mm LGA package requiring only a few input and output capacitors. Output voltage tracking is available BOARD PHOTO DEMO MANUAL DC568A LTM46A Ultrathin Dual A Step-Down µmodule Regulator through the TRACK/SS pin for supply rail sequencing. External clock synchronization is available through the MODE pin. For high efficiency at low load currents, the MODE pin jumper (JP) selects the Burst Mode option for operation in less noise sensitive applications. The LTM46A data sheet must be read in conjunction with this demo manual for working on or modifying demo circuit 568A. Design files for this circuit board are available at http://www.linear.com/demo/dc568a L, LT, LTC, LTM, Linear Technology, the Linear logo, μmodule and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. dc568af
DEMO MANUAL DC568A PERFORMANCE SUMMARY PARAMETER CONDITIONS/NOTES VALUE Input Voltage Range 4V 0V Output Voltage V OUT, V OUT Programmable with FB Pin Resistors 5V DC,.V DC Maximum Continuous Output Current Derating is Necessary for Certain Operating ADC Each Phase Conditions, See Data Sheet for Details Default Operating Frequency MHz Efficiency V IN = V, V OUT = 5V, I OUT = A, f SW = MHz 9.6% (See Figure ) V IN = V, V OUT =.V, I OUT = A, f SW = MHz 88.5% (See Figure ) QUICK START PROCEDURE Demonstration circuit 568A is an easy way to evaluate the performance of the LTM46A. Please refer to Figure for test setup connections and follow the procedure below.. With power off, place the jumpers in the following positions for a typical application for 5V OUT and.v OUT rails. JP JP JP RUN RUN MODE ON ON CCM. Before powering up the input supply and loads, preset the input voltage supply to be between 4V to 0V. Preset the load current for each output rail to 0A.. With power off, connect the loads, input voltage supply and meters as shown in Figure. 4. Turn on the input power supply. The output voltage meters for each output rail should display the programmed output voltage ± %. NOTES:. V IN, V IN are tied together by default (via R0 jumper). Because INTV CC is generated from V IN, for applications where V IN and V IN use separate supplies (R0 unstuffed) V IN must be at least.6v in order to enable V OUT.. Demonstration circuit 568A is designed to exhibit the wide output voltage range of the LTM46A. In order to keep inductor current ripple within reasonable limits, it is recommended to increase programmed switching frequency for higher output voltages. The programmed switching frequency for data provided in this manual is consistent with switching frequency recommendations corresponding to the programmed output voltage. Please refer to the LTM46A data sheet for more details regarding recommended switching frequency for your particular application. 5. Once the proper output voltages are established, adjust the load current on each rail within the 0A to A range and observe each output rail s load regulation, efficiency, and other parameters. 6. To observe increased light load efficiency, place the MODE pin jumper (JP) in the BURST position. dc568af
DEMO MANUAL DC568A QUICK START PROCEDURE LOAD 0A TO A LOAD 0A TO A V IN Figure. DC568A Test Setup dc568af
DEMO MANUAL DC568A QUICK START PROCEDURE 95 90 EFFICIENCY (%) 85 80 75 70 V OUT = 5.0V V OUT =.V 0 0.5.5 LOAD CURRENT (A) dc568a F0 Figure. Measured Supply Efficiency at V IN V OUT 50mV/DIV V OUT 50mV/DIV A/DIV A/DIV V IN (V) V OUT (V) C OUT 5 4.7μF 47μF Figure. Measured Load Transient Response, (A to A Load Step) V IN (V) V OUT (V) C OUT. 4.7μF 47μF Figure 4. Measured Load Transient Response (A to A Load Step) 4 dc568af
DEMO MANUAL DC568A QUICK START PROCEDURE V IN (V) V OUT (V), I OUT (A) V OUT (V), I OUT (A) f SW (MHz) AMBIENT TEMPERATURE ( C) 5,., 6 Figure 5. Thermal Capture at Full Load, Natural Convection dc568af 5
DEMO MANUAL DC568A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER PART NUMBER Required Circuit Components C CAP 060.µF 0% 0V X5R MURATA GRM88R6A5KE4D C, C0 CAP 0µF 0% 5V X5R MURATA GRMBR6E06KA7L 4 C6, C0, C, C9 CAP 4.7µF 0%6V X5R MURATA GRMBR6E06KA7L 4 C7, C5 CAP 74 47µF 0% 6V POSCAP PANASONIC 6TQC47MW 5 C, C4 CAP 060 0.µF 0% 5V X5R AVX 060D04KATA 6 R RES 060.k % 0.W VISHAY CRCW060KFKEA 7 R0 RES 060 8.5k % 0.W VISHAY CRCW0608K5FKEA 8 R0 RES 06 0Ω 0.5W VISHAY WSL0600000EA9 9 U IC, DUAL A STEP-DOWN µmodule REG., LGA LINEAR TECHNOLOGY LTM46AV#PBF Additional Demo Board Circuit Components C, C CAP µf 0% 5V X5R MURATA GRMBR6E6ME-44L C8, C8 CAP 060 0pF 5% 5V X5R AVX 060A00JATA C0, C CAP 74 µf 0% 5V TANT POLY PANASONIC 5TQCMV 4 0 C, C4, C6, C CAP 0 ION ION ION 5 0 C5, C CAP 060 ION ION ION 6 0 R, R0, R, R4, R6-R9, RES 060 ION ION ION R-R, R6-R8 7 4 R9, R5, R4, R5 RES 060 00k 5% /0W VISHAY CRCW06000KJNEA 8 R RES 060 0Ω JUMPER VISHAY CRCW0600000Z0EA 9 0 R9 RES 06 ION ION ION Hardware E-E TEST POINT, TURRET, 0.094", MTG. MILL-MAX 50--00-80-00-00-07-0 HOLE JP, JP HEADER -PIN, mm WURTH ELEKTRONIK 6000 JP HEADER -PIN, DBL ROW mm WURTH ELEKTRONIK 60006 4 4 MP-MP4 STANDOFF, NYLON, SNAP-ON, 0.50" KEYSTONE 88 5 XJP-XJP CONN., SHUNT, FEMALE, -POS, mm WURTH ELEKTRONIK 608004 6 dc568af
5 5 4 4 DEMO MANUAL DC568A SCHEMATIC DIAGRAM REVISION HISTORY ECO REV DESCRIPTION DATE APPROVED PROD 09/6/6 f l D D VOUT FB C C COMP INTVCC FB COMP VOUT VIN C uf 5V 74 VIN C0 uf 5V 74 [] PGOOD PGOOD U LTM46AV VOUT A VOUT B FB A4 COMP A5 R VIN SS RUN INTVCC R 0 TRACK/SS A B B SS INTVCC RUN VIN C4 C5 FREQ MODE PGOOD D4 INTVCC C VIN A VIN E VIN D D E VOUT VOUT D RUN B5 C C D5 PGOOD B4 VIN B E4 E5 FB COMP C 0uF 5V C uf 5V C0 4.7uF 6V C 0 E7 E VOUT.V / A MAX VOUT 5V / A MAX C7 47uF 6V 74 E E E9 E0 C6 0 C9 4.7uF 6V C 4.7uF 6V R C C.uF 0V R4 00k R5 00k C8 0pF C5 C0 0uF 5V R.k % C uf 5V C4 0 C6 4.7uF 6V C 0 [] E E E4 VIN 4V - 0V C8 0pF E6 VIN 4V - 0V C5 47uF 6V 74 R0 8.5k % TRACK E8 R9 R8 C4 0.uF ON OFF RUN JP R9 00k R0 E TRACK/SS R R BURST CCM CLK SYNC RUN B MODE 4 5 6 JP R4 R5 00k RUN JP ON OFF C 0.uF R6 R7 E5 E TRACK CLK VIN R0 VIN 0 06 IONAL JUMPERS FOR PARALLEL OPERATION R R6 R7 R8 FB FB COMP COMP SS SS RUN RUN VOUT R9 06 VOUT NOTE: UNLESS OTHERWISE SPECIFIED. ALL RESISTORS AND CAPACITORS ARE 060 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A PCB DES. ` \ CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; Fax: (408)44-0507 A A HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. f l LTC Confidential-For Customer Use Only APPLICATION. COMPONENT SUBSTITUTION AND PRINTED TITLE: DEMO CIRCUIT SCHEMATIC, CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT IC NO. PERFORMANCE OR RELIABILITY. CONTACT LINEAR m TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. LTM46AV DUAL A STEP-DOWN MODULE REGULATOR [] C0, C ARE IONAL CAPACITOR. IT IS INSERTED TO DAMPEN THE (POSSIBLE) RINGING VOLTAGE DUE TO LONG INPUT LEADS. ON A NORMAL, TYPICAL PCB, WITH SHORT TRACES, THE CAPACITOR IS NOT NEEDED.. IF VIN, VIN USE SEPARATE SUPPLIES, VIN AT LEAST.6V IS REQUIRED IN ORDER TO ENABLE VOUT CHANNEL CUSTOMER NOTICE APPROVALS 60 McCarthy Blvd. Milpitas, CA 9505 Phone: (408)4-900 www.linear.com SKU NO. PCA BOM: 700-DC568A_REV0 SCHEMATIC NO. AND REVISION: DC568A PCA ASS'Y: 705-DC568A_REV0 70-DC568A_REV0 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE DATE: Friday, September 6, 06 SHEET OF SIZE: N/A 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. dc568af 7
DEMO MANUAL DC568A 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 0 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 60 McCarthy Blvd. Milpitas, CA 9505 Copyright 004, Linear Technology Corporation 8 LT 6 PRINTED IN USA Linear Technology Corporation 60 McCarthy Blvd., Milpitas, CA 9505-747 (408) 4-900 FAX: (408) 44-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 06 dc568af