DEMO MANUAL DC2258A LT3048 Low Noise Bias Generator Description Demonstration circuit 2258A features the LT®3048, a Boost DC/DC Converter with integrated Schottky diode and LDO in a 2mm × 2mm DFN package. This demo board is designed to convert a 2.7V to 4.8V input to a 20V output at 10mA to 25mA with low output ripple and noise. The LT3048 allows for the output to be programmed up to 23V. The LT3048 is programmed for 1MHz switching frequency. Performance Summary PARAMETER The LT3048 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 the demo circuit DC2258A. Design files for this circuit board are available at http://www.linear.com/demo/DC2258A 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. Specifications are at TA = 25°C CONDITIONS MIN Input Supply Range Output Voltage Range VIN = 2.7V, IOUT = 10mA Switching Frequency VIN = 4.8V, Load = 25mA MAX UNITS 4.8 V 19.5 20 20.5 V 0.7 1 1.3 MHz 1 mV 90 80 70 EFFICIENCY (%) Output Ripple TYP 2.7 60 50 40 30 20 10 2.7VIN 4.8VIN 2 4 6 8 10 12 14 16 18 20 22 24 26 28 OUTPUT CURRENT (mA) DC2258A F01 Figure 1. Efficiency Curve dc2258af 1 DEMO MANUAL DC2258A Quick Start Procedure Demonstration circuit 2258A is easy to set up to evaluate the performance of the LT3048. Refer to 0 for proper measurement equipment setup and follow the procedure below: NOTE. When measuring the output voltage ripple, connect a X1 oscilloscope probe as shown in Figure 3. 1.Place jumper in the following positions: 1 Run 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 4.8V. 4.Connect a 20mA load from VOUT to GND and check for the proper output voltage. VOUT = 19.5V to 20.5V If there is no output, temporarily disconnect the load to make sure that the load is not set too high. 5.Once the proper output voltages are established, adjust the input voltage and load within the operating range and observe the output voltage regulation, ripple voltage, efficiency and other parameters. Figure 2. Proper Measurement Equipment Setup 2 dc2258af DEMO MANUAL DC2258A Quick Start Procedure Figure 3. Output Ripple Measurement Technique 2mV/DIV 100ns DC2258A F04 Figure 4. Output Voltage Ripple dc2258af 3 DEMO MANUAL DC2258A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 CAP., 4.7µF, X7R, 50V, 10%, 1206 MURATA, GRM31CR71H475KA12L 2 1 C2 CAP., 4.7µF, X7R, 25V, 10%, 0805 TDK, C2012X7R1E475K125AB 3 1 C3 CAP., 1000pF, C0G, 25V, 5%, 0603 MURATA, GRM1885C1E102JA01D 4 1 C4 CAP., 1µF, X7R, 25V, 10%, 0603 TDK, C1608X7R1E105K080AB 8 1 L1 IND., 22µH, PWR, WE-LQS, 20% WURTH ELEKTRONIK, 74404024220 9 1 R1 RES., 1MΩ, 1%, 1/10W, 0603 VISHAY, CRCW06031M00FKEA 10 1 R2 RES., 66.5kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060366K5FKEA 11 1 U1 I.C., DFN-2×2, 8-LEAD LINEAR TECH., LT3048EDC#PBF 12 1 PCB, DC2258A DEMO CIRCUIT 2258A CAP., 1µF, X7R, 25V, 10%, 0603 TDK, C1608X7R1E105K080AB Additional Demo Board Circuit Components 4 1 C5 Hardware: For Demo Board Only 5 4 E1, E2, E3, E4 TEST POINT, TURRET, .094", THT MILL-MAX, 2501-2-00-80-00-00-07-0 6 1 JP1 CONN., HEADER, 1×3, 2mm SULLINS, NRPN031PAEN-RC 7 1 XJP1 SHUNT, 2mm SAMTEC, 2SN-BK-G 4 dc2258af DEMO MANUAL DC2258A A 15 18 20 28 2.7 3.3 3.6 4.8 2 R2 66.5K R1 1M 3 LDOOUT FB 5 6 4 BYP BSTOUT 8 GND 4 5 E3 RUN ON OFF A B C D GND C2 4.7uF 25V 0805 JP1 E1 VIN 2.7V - 4.8V WE 74404024220 3 5 1 4 L1 22uH 2 7 1 2 EN VIN SW U1 LT3048EDC 3 GND 3 9 C3 1nF 2 C1 4.7uF 50V 1206 C4 1uF 25V C5 1uF 25V * Iout (mA) Vin (V) 1 GND E2 E4 1 VOUT 20V * B C D Schematic Diagram dc2258af 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 DC2258A 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 6 dc2258af Linear Technology Corporation LT 0815 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2015