DEMO MANUAL DC1724A Description LTM8029 36VIN, 600mA Step-Down Module Converter with 5A Quiescent Current DC1724A is a Module(R) step-down converter, featuring the LTM8029, which consumes only 5A of quiescent current. The demo circuit is designed for a 5V, 600mA output at an operating frequency of 600kHz. The input voltage range is from 5.6V to 36V. Equipped with an off-time skipping capability, the LTM8029 can operate at input voltages lower than other step-down regulators. range. To provide a programmable undervoltage lockout, users can remove jumper JP1 and populate R1 and R3 on the RUN pin. The wide input range of the LTM8029 allows a variety of input sources such as automotive batteries and industrial supplies. Its current mode control scheme creates fast transient response and good loop stability. At light loads, the LTM8029 operates in Burst Mode(R) operation to maintain high efficiency and low output ripple over a broad current Design files for this circuit board are available at http://www.linear.com/demo The LTM8029 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this demo manual prior to working on or modifying demo circuit DC1724A. L, LT, LTC, LTM, Module, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Board Photo dc1724afa 1 DEMO MANUAL DC1724A Performance Summary (TA = 25C) PARAMETER CONDITIONS VALUE Input Voltage Range VOUT = 5V 5.6V to 36V Output Voltage 5V Maximum Output Current 600mA Typical Switching Frequency 600kHz VIN = 12V, VOUT = 5V, IOUT = 600mA Typical Efficiency 85% 0 INTENSITY (dBm) -20 -40 -60 -80 -100 -120 -140 0 0.5 1 1.5 2 2.5 3 3.5 FREQUENCY (MHz) 4 4.5 5 DC1724A F01 Figure 1. DC1724A Output Noise Spectrum (VIN = 12V, VOUT = 5V, IOUT = 600mA) Quick Start Procedure DC1724A provides an easy way to evaluate the performance of the LTM8029. Refer to Figure 2 for proper measurement equipment setup and follow the procedure below: 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 3 for proper scope probe technique. 1. Place JP1 on the ON position. 2. With power off, connect the input power supply to VIN and GND. 3. Turn on the power at the input. NOTE: Make sure that the input voltage does not exceed 36V. 4. Check for the proper output voltage. NOTE. If there is no output, temporarily disconnect the load to make sure that the load is not set too high or is shorted. 5. Once the proper output voltage is established, adjust the load within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. dc1724afa 2 DEMO MANUAL DC1724A quick start procedure Figure 2. Proper Measurement Equipment Setup GND VIN Figure 3. Measuring Input or Output Ripple dc1724afa 3 DEMO MANUAL DC1724A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C2 CAP., X7R, 1.0F, 50V, 10%, 0805 MURATA, GRM21BR71H105KA12L 2 1 C3 CAP., X5R, 22F, 6.3V, 20%, 1206 TDK, C3216X5R0J226M 3 1 R2 RES., CHIP, 0, 1/16W, 0603 NIC, NRC06ZOTRF 4 1 R4 RES., CHIP, 316k, 1/10W, 1%, 0603 VISHAY, CRCW0603316KFKEA 5 1 R5 RES., CHIP, 100k, 1/10W, 1% 0603 VISHAY, CRCW0603100KFKEA 6 1 R6 RES., CHIP, 221k, 1/10W, 1% 0603 VISHAY, CRCW0603221KFKEA 7 1 R7 RES., CHIP, 0, 1/4W, 1% 1206 NIC, NRC12Z0TRF 8 1 U1 IC., MODULE REGULATOR, LTM8029EY BGA-35 LEAD LINEAR TECH., LTM8029EV Additional Demo Board Circuit Components 1 1 C1 CAP., ALUM, 10F, 50V 2 0 C4, C5 (OPT) CAP., 0603 3 0 C6 (OPT) CAP., 1210 4 0 C7 (OPT) CAP., ALUM CAP. SUN ELECT., 50CE10BS 5 0 R1, R3 (OPT) RES., CHIP, 0603 6 0 FB1 (OPT) FERRITE BEAD, M TYPE TAIYO YUDEN, FBMJ3216HS800T 7 0 L1 (OPT) IND., 10H VISHAY, IHLP-2525CZ-01 TEST POINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0 Hardware - For Demo Board Only 1 6 E1-E6 2 1 JP1 3 PIN 0.079" SINGLE ROW HEADER SAMTEC, TMM103-02-L-S 3 1 XJP1 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G 4 1 STENCIL dc1724afa 4 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. 1 2 3 4 VIN E4 E1 C1 + 10uF 50V VIN C5 0.01uF 50V FB1 Bead A C6 10uF 50V 1210 + L1 IN 10uH IHLP-2525CZ-01 IN OFF ON JP1 C7 10uF 50V 0 1206 R7 OPTIONAL CIRCUIT GND VIN 5.6V-36V 1 3 2 R4 316K R6 221K (600KHz) B1 A2 A1 RT FB RUN VIN VIN VIN VIN B C C2 1.0uF 50V 0805 A4 A5 B4 B5 U1 LTM8029EY C R3 OPT R1 OPT B PGOOD BIAS VOUT VOUT VOUT VOUT VOUT VOUT VOUT VOUT GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND R5 100K VOUT R2 0 C4 (OPT) VOUT C3 22uF 6.3V 1206 TECHNOLOGY 1. ALL RESISTORS ARE 0603. ALL CAPACITORS ARE 0603. E E6 E5 E3 E2 D Thursday, November 17, 2011 E PGOOD BIAS GND VOUT 5V @ 600mA NOTE: UNLESS OTHERWISE SPECIFIED B2 H3 H5 H4 G5 G4 G3 F5 F4 F3 D C1 C2 D1 D2 D3 D4 D5 E1 E2 E3 E4 E5 F1 F2 G1 G2 H1 H2 A 1 2 3 4 DEMO MANUAL DC1724A Schematic Diagram dc1724afa 5 DEMO MANUAL DC1724A 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 dc1724afa 6 Linear Technology Corporation LT 0612 REV A * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2012