EVALUATION BOARD DATASHEET EV-146 AAT1265 EVAL: Low Voltage 2MHz Step-Up DC/DC Converter Introduction The AAT1265 evaluation board provides a platform for the testing and evaluation of the AAT1265 low voltage 2MHz step-up regulator. The evaluation board demonstrates suggested size and placement of external components to maintain output voltage regulation for up to 250mA of output current. The external components are selected for small size to suit portable applications while the layout has been optimized to achieve high efficiency with the SC70JW-8 package. The design operates across an input voltage range of 0.8V to VOUT. The AAT1265 EVAL demo board provides a 3.3V output at 250mA maximum output current for a dual AA cell input. This document provides details on the operation and testing of the AAT1265 evaluation board. Operating Specification Specification Input Voltage Output Voltage Accuracy Line Regulation Load Regulation Description/Conditions Min VIN = 0.8V to 2.5V, PWM Mode; TA = -40°C to +85°C 0.8V ≤ VIN ≤ 2.5V [ΔVOUT / VOUT / ΔVIN] 0mA ≤ IOUT ≤ 100mA [ΔVOUT / VOUT] Typ 0.8 VOUT – 0.1V 0.2 1.5 Max Units VOUT VOUT + 0.1V V %/V % Table 1: AAT1265 Evaluation Board Operating Specification. Schematic U1 AAT1265 L1 VIN 4 3 LX VCC VIN OUT 1 5 VOUT C2 C1 [CIN ] [C OUT] 2 EN GND 6,7,8 EN Figure 1: AAT1265 Evaluation Board Schematic. Bill of Materials (BOM) Component Part Number U1 AAT1265IJS C1608X5R1A475K LMK107BJ475K C2012X5R1A475K GRM21BR61A475K LMK212BJ475MG PRPN401PAEN SD3118-2R2 CDRH2D14-2R2 C1, C2 EN L1 Description Low Voltage 2MHz Step-Up Converter Ceramic Capacitor: 4.7μF, 10V, 0603 Ceramic Capacitor: 4.7μF, 10V, 0805 Connecting Header, 2mm 2.2μH/1.62A Inductor 2.2μH/1.50A Inductor Manufacturer AnalogicTech TDK Taiyo Yuden TDK Murata Taiyo Yuden Sullins Electronics Cooper Bussmann Sumida Table 2: Component Listing EV146.2007.11.1.0 www.analogictech.com 1 EVALUATION BOARD DATASHEET EV-146 AAT1265 EVAL: Low Voltage 2MHz Step-Up DC/DC Converter Setup 1. 2. 3. Configure the specified test equipment as shown in Figure 2, where Jumper 1 placement options are illustrated. An additional 100μF or greater capacitor [CADD in Figure 2] may be required to decouple the input power supply and maintain stable operation. Solder the additional capacitor to the VIN and GND terminals on the AAT1265 evaluation board. Input power supply with remote sense may be used. This simplifies the test procedure and maintains high accuracy of the input voltage across the loading range. Connect remote sense from input power source remote sense terminals to the VIN and GND terminals on the AAT1265 evaluation board (optional, not shown in Figure 2). 2.000V 3.300V Voltmeter Voltmeter Load Power Supply 2.080V 0 – 250mA 0.550A ADD ON OFF Jumper 1 Jumper 1 Figure 2: AAT1265 Evaluation Board Connection Diagram with Jumper 1 Settings. 2 www.analogictech.com EV146.2007.11.1.0 EVALUATION BOARD DATASHEET EV-146 AAT1265 EVAL: Low Voltage 2MHz Step-Up DC/DC Converter Evaluation/Testing Enabling [Jumper 1 initially in ON position on EN] 1. 2. Turn-Off With input voltage applied, remove Jumper 1 and re-insert in the OFF position on EN. The output voltage should decay to zero. Turn-On With input voltage applied, remove Jumper 1 on EN and re-insert in the ON position on EN. The output voltage should recover to its nominal DC value of 3.3V. Load and Line Regulation 1. 2. 3. Enable the AAT1265 by placing Jumper 1 in the ON position on EN, as shown in Figure 2. Turn on the input power supply and set to desired input voltage based on the DC voltmeter. Vary the output load from 0 to 250mA (for a dual AA cell input) and vary the input voltage from 0.8V to VOUT while monitoring the output voltage. EV146.2007.11.1.0 www.analogictech.com 3 EVALUATION BOARD DATASHEET EV-146 AAT1265 EVAL: Low Voltage 2MHz Step-Up DC/DC Converter Printed Circuit Board Figure 3: AAT1265 Evaluation Board Top Layer (not to scale). Figure 4: AAT1265 Evaluation Board Bottom Layer (not to scale). Advanced Analogic Technologies, Inc. 3230 Scott Boulevard, Santa Clara, CA 95054 Phone (408) 737-4600 Fax (408) 737-4611 © Advanced Analogic Technologies, Inc. AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice. Except as provided in AnalogicTech’s terms and conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders. 4 www.analogictech.com EV146.2007.11.1.0