DEMO MANUAL DC1161B LT3507 Triple Monolithic Step-Down Regulator with LDO DESCRIPTION Demo circuit 1161B is a triple monolithic step-down regulator with LDO featuring LT®3507. The demo circuit is designed for 1.8V, 3.3V, 5.0V and 2.5V outputs from a 7V to 36V input. The current capability of each channel is 2.4A, 1.3A, 1.4A and 0.2A respectively. Independent input voltage, feedback, soft-start and power good pins for each channel simplify complex power supply tracking/ sequencing requirements. All three converters are either synchronized to a common external clock input or single-resistor programmable from 250kHz to 2.5MHz using internal oscillator. At all frequencies, a 180° phase shift between VOUT1 and the other two outputs is maintained, reducing input voltage ripple and component size. Programmable frequency allows for optimization between efficiency and external component size. PERFORMANCE SUMMARY PARAMETER Each output can be independently disabled using its own soft-start pin, or by using the SHDN pin the entire part can be placed in a low quiescent current shutdown mode. The LT3507 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 1161B. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. (TA = 25°C) CONDITION Minimum Input Voltage VALUE 7V Maximum Input Voltage 36V Output Voltage VOUT1 VIN = 7V ~ 36V 1.80V ±3% Output Voltage VOUT2 VIN = 7V ~ 36V 3.33V ±3% Output Voltage VOUT3 VIN = 7V ~ 36V 5.0V ±3% Output Voltage VOUT4 VIN = 7V ~ 36V 2.52V ±3% Maximum Output Current IOUT1 VIN = 7V ~ 36V 2.4A Maximum Output Current IOUT2 VIN = 7V ~ 36V 1.3A Maximum Output Current IOUT3 VIN = 7V ~ 36V 1.4A Maximum Output Current IOUT4 VIN = 7V ~ 36V 0.2A Voltage Ripple VOUT1 VIN = 12V, IOUT1 = 2.4A <20mV Voltage Ripple VOUT2 VIN = 12V, IOUT2= 1.3A <20mV Voltage Ripple VOUT3 VIN = 12V, IOUT3= 1.4A <20mV Voltage Ripple VOUT4 VIN = 12V, IOUT4= 0.2A <10mV Switching Frequency 450kHz ±10% dc1161bf 1 DEMO MANUAL DC1161B QUICK START PROCEDURE Demo circuit 1161B is easy to set up to evaluate the performance of the LT3507. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1. With power off, connect the input power supply to VIN and GND. 2. Turn on the power at the input. Note: Make sure that the input voltage does not exceed 36V. Note: When measuring the input or output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the input or output voltage ripple by touching the probe tip directly across the VIN or VOUT and GND terminals. See Figure 2 for proper scope probe technique. – + A LOAD 3. Check for the proper output voltages. Note: If there is no output, temporarily disconnect the load to make sure that the load is not set too high. 4. Once the proper output voltages are established, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. + + – – V + – A LOAD – – + + V – – – V + POWER SUPPLY + A A + – – V + – + + + A + V LOAD – – + LOAD – DC1161B F01 Figure 1. DC1161B Proper Equipment Setup VIN GND Figure 2. Measuring Input or Output Ripple dc1161bf 2 DEMO MANUAL DC1161B SYNC FUNCTION EMI FILTER Install a 10k R20 resistor if the board is synchronized from an external signal generator. Install EMI filters on the backside of the DC1161, however, a trace cut is required for the insertion of the option circuit. See Figure 3 for the cut line. CUT HERE Figure 3. Cut Line for the EMI Filter Installation dc1161bf 3 DEMO MANUAL DC1161B PARTS LIST ITEM QTY REFERENCE Required Circuit Components 1 3 CIN1, CIN2, CIN3 2 3 C1, C2, C9 3 2 C3, C10 4 1 C4 5 3 C5, C6, C11 6 4 C7, C8, C13, C20 7 1 C12 8 3 C15, C17, C19 9 1 D4 10 2 D6, D5 11 3 D7, D8, D9 12 1 L1 13 1 L2 14 1 L3 15 1 Q1 16 5 R1, R2, R3, R15, R22 17 1 R4 18 1 R5 19 3 R6, R7, R11 20 3 R8, R9, R23 21 1 R10 22 1 R12 23 1 R13 24 1 R14 25 1 R16 26 1 R17 27 1 R18 28 1 R19 29 1 U1 Additional Demo Board Circuit Components 1 1 CIN4 2 0 C14, C16, C18 3 0 C21 4 0 C22 5 0 C23 6 4 C24-C27 7 0 C28 8 0 C29 9 0 D1, D2, D3 10 0 FB1 11 0 L4 12 0 R20 13 0 R21 Hardware-For Demo Board Only 1 10 E1, E2, E6-E9, E12-E15 2 9 E3, E4, E5, E10, E11, E16-E19 PART DESCRIPTION MANUFACTURER / PART # CAP., X7R, 2.2μF, 50V, 10%, 1210 CAP., X7R, 0.22μF, 25V, 10%, 0603 CAP., X5R, 47μF, 10V, 20%, 1206 CAP., X5R, 22μF, 6.3V, 20%, 1206 CAP., X7R, 680pF, 50V, 10%, 0402 CAP., X5R, 0.1μF, 10V, 10%, 0402 CAP., X5R, 2.2μF, 6.3V, 20%, 0603 CAP., NPO, 47pF, 50V, 5%, 0402 DIODE, SCHOTTKY, B340A, SMA-DIODE DIODE, SCHOTTKY, B240A, SMA-DIODE DIODE, SCHOTTKY, CMDSH-4E, SOD323 IND., 4.7μH IND., 8.2μH IND., 10μH XTOR, NPN, 50V LOW SATURATION, MLP322 RES., CHIP, 100k, 1/16W, 1%, 0402 RES., CHIP, 12.4k, 1/16W, 1%, 0402 RES., CHIP, 31.6k, 1/16W, 1% 0402 RES., CHIP, 20k, 1/16W, 1% 0402 RES., CHIP, 10k, 1/16W, 1% 0402 RES., CHIP, 53.6k, 1/16W, 1% 0402 RES., CHIP, 10.2k, 1/16W, 1% 0402 RES., CHIP, 1.07k, 1/16W, 1% 0402 RES., CHIP, 49.9k, 1/16W, 1% 0402 RES., CHIP, 499Ω, 1/16W, 1% 0402 RES., CHIP, 18.2k, 1/16W, 1% 0402 RES., CHIP, 3.32k, 1/16W, 1% 0402 RES., CHIP, 107k, 1/16W, 1% 0402 I.C., LT3507EUHF, QFN38UHF TDK, C3225X7R1H225K TDK, C1608X7R1E224K TAIYO YUDEN, LMK316BJ476ML-T TAIYO YUDEN, JMK316BJ226ML AVX, 04025C681KAT AVX, 0402ZD104KAT TAIYO YUDEN, JMK107BJ225MA AVX, 04025A470JAT DIODES INC., B340A DIODES INC., B240A CENTRAL SEMI., CMDSH-4E NIC, NPIM74C4R7MTRF NIC, NPIM74C8R2MTRF NIC, NPIM74C100MTRF ZETEX, ZXTCM322TA YAGEO, RC0402FR-07100KL VISHAY, CRCW040212K4FKEA VISHAY, CRCW040231K6FKEA VISHAY, CRCW040220K0FKEA YAGEO, RC0402FR-0710KL VISHAY, CRCW040253K6FKEA NIC, NRC04F1022TRF YAGEO, RC0402FR-071K07L VISHAY, CRCW040249K9FKEA AAC, CR05-4990FM VISHAY, CRCW040218K2FKEA VISHAY, CRCW04023K32FKEA AAC, CR05-1073FM LINEAR TECH., LT3507EUHF CAP., ELECTROLYTIC, 22μF, 50V CAP., 0402 CAP., X7R, 0.01μF, 50V, 10%, 0603 CAP., X7R, 2.2μF, 50V, 10%, 1210 CAP., ELECTROLYTIC, 22μF 50V CAP., X5R, 1μF, 10V, 10%, 0603 CAP., 0402 CAP., 1206 DIODE, SCHOTTKY, CMDSH-4E, SOD323 BEAD, 1206 OPT IND., 22μH, OPT RES., CHIP, 0402 RES., CHIP, 0603 SANYO, 50CE22LX OPT OPT OPT OPT MURATA, GRM188R61A105K OPT OPT OPT TAIYO YUDEN, FB MJ3216HS800 VISHAY, IHLP4040DZER220-M01 OPT OPT TP, TURRET, 0.094" TP, TURRET, 0.064" MILL-MAX, 2501-2-00-80-00-00-07-0 MILL-MAX, 2308-2-00-44 dc1161bf 4 DEMO MANUAL DC1161B SCHEMATIC DIAGRAM dc1161bf 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 DC1161B 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 © 2004, Linear Technology Corporation dc1161bf 6 Linear Technology Corporation LT 0411 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2011