Application Note: AN01 – Evalboard Description AS1312 Ultra Low Quiescent Current, Hysteretic DC-DC Step-Up Converter www.ams.com Revision 2.0 / 11/12/2012 AS1312 – AN01 – Evalboard Table of Contents 1. Further Applications ............................................................................................................... 2 2. Revision Status ...................................................................................................................... 2 3. Getting Started ...................................................................................................................... 2 4. HW – Overview: ..................................................................................................................... 3 4.1. Jumper and device locations ..................................................................................... 4 4.2. AS1312 Evalboard BOM ............................................................................................ 5 5. PCB Layer Stackup ............................................................................................................... 5 6. Demoboard Schematic .......................................................................................................... 6 7. Demoboard Layout ................................................................................................................ 7 8. Ordering Information ............................................................... Error! Bookmark not defined. www.ams.com Revision 2.0 / 11/12/2012 Page 1/9 AS1312 – AN01 – Evalboard 1. Further Applications Visit our homepage www.ams.com 2. Revision Status AS1312 AN01 – Evalboard 2V0 AS1312 Evalboard 2V0 3. Getting Started The AS1312 Evalboard is designed to work with all available AS1312 versions. On this Evalboard the AS1312-BTDT-50 variant is mounted. For testing the board, please connect a supply voltage (0.7V to 5.0V) between Vin and GND. Set EN (J2) to “on” and the Vout of 5.0V are measureable at TP4 (Vout). When connecting a load to Vout, please use the Vout connector (BU3). For POK feature, please set LBI (J1) to “GND”. In this case, the LBO is related to the Vout and stays high as long as the Vout is higher than 92.5% of its nominal value. For input voltage monitoring, set LBI (J1) to “Vin”. In this case, the LBO stays high as long as the voltage on LBI is higher than the threshold of 0.6V. With the resistor divider R1/R2 (not mounted) it´s possible to select a specific Vin threshold. www.ams.com Revision 2.0 / 11/12/2012 Page 2/9 AS1312 – AN01 – Evalboard 4. HW – Overview: BU1 TP3 TP1 J2 J1 TP5 BU2 TP2 TP4 BU3 www.ams.com Revision 2.0 / 11/12/2012 Page 3/9 AS1312 – AN01 – Evalboard 4.1. Jumper and device locations Label Name Description Info BU1 Vin Input voltage connect the pos terminal of the supply voltage BU2 GND GND connect the neg terminal of the supply voltage BU3 Vout Output voltage for connecting a load to the output voltage • Vin: The LBI monitors Vin via a resistive divider → LBO goes low, if LBI threshold (0.6V) is reached J1 LBI Low Battery Input • GND: The LBI is connected to GND → LBO works like a POK J2 EN • This jumper may not be left floating • on: The AS1312 is enabled • off: The AS1312 is disabled Enable TP1 Vin Input voltage measurement point TP2 LX external coil measurement point TP3 LBO LBO/POK output measurement point TP4 Vout Output voltage measurement point TP5 GND GND measurement point www.ams.com Revision 2.0 / 11/12/2012 Page 4/9 AS1312 – AN01 – Evalboard 4.2. AS1312 Evalboard BOM Designator Function Part Description Manufacturer Part Number C1 input cap 22uF/6.3V/X5R/0805 Murata GRM21BR60J226ME39L C2 output cap 22uF/6.3V/X5R/0805 Murata GRM21BR60J226ME39L Cref reference cap 100nF/6.3V/X7R/0603 Murata GRM188R71C104KA01D L1 coil 6.8uH/725mA/336mΩ Coilcraft XPL2010-682M Rpok POK pull-up 100kΩ/63mW/5%/0603 Multicomp MC 0.063W 0603 1% 100K 5. PCB Layer Stackup www.ams.com Revision 2.0 / 11/12/2012 Page 5/9 AS1312 – AN01 – Evalboard 6. Demoboard Schematic www.ams.com Revision 2.0 / 11/12/2012 Page 6/9 AS1312 – AN01 – Evalboard 7. Demoboard Layout www.ams.com Revision 2.0 / 11/12/2012 Page 7/9 AS1312 – AN01 – Evalboard www.ams.com Revision 2.0 / 11/12/2012 Page 8/9 AS1312 – AN01 – Evalboard 8. Copyright Copyright © 1997-2012, ams AG, Tobelbader Strasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. 9. Disclaimer Devices sold by ams AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. ams AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. ams AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with ams AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life sustaining equipment are specifically not recommended without additional processing by ams AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by ams AG is believed to be correct and accurate. However, ams AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of ams AG rendering of technical or other services. Contact Information Headquarters ams AG Tobelbader Strasse 30 8141 Unterpremstaetten Austria T. +43 (0) 3136 500 0 For Sales Offices, Distributors and Representatives, please visit: http://www.ams.com/contact www.ams.com Revision 2.0 / 11/12/2012 Page 9/9