EVALUATION BOARD DATA SHEET EV148 Evaluation Board for the AAT3183 300 mA Inductorless Step-Down Converter Introduction The AAT3183 evaluation board provides a platform for the testing and evaluation of the AAT3183 inductorless stepdown regulator. The evaluation board demonstrates suggested size and placement of external components to maintain output voltage regulation for up to 300mA of output current. The external components were selected to suit portable applications where the layout has been optimized to achieve high efficiency with the SC70JW-8 package. The design operates across an input voltage range of 2.7 to 5.5V. The AAT3183 evaluation board provides a 1.5V output at 300mA maximum output current. This document provides details on the operation and testing of the AAT3183 evaluation board. For further information consult the AAT3183 product datasheet. Operating Specification Specification Description/Conditions Min Input Voltage Output Voltage Accuracy VOUT = 1.5V, IOUT = 0mA, TA = -40°C to +85°C Line Regulation Load Regulation 3.2V ≤ VIN ≤ 5.5V, IOUT = 50mA [ΔVOUT/ΔVIN] 0mA ≤ IOUT ≤ 150mA, VIN = 3.6V [ΔVOUT/ΔIOUT] 2.7 1.470 -2 Typ Max Units 1.500 5.5 1.530 +2 V V % mV/V mV/mA 2.9 0.053 Table 1: AAT3183 Evaluation Board Operating Specification. Schematic C2 [C FLY] 3 4 VIN C1 2 C1- C1+ IN OUT 1 VOUT C3 [C IN] [C OUT] R1 5 EN GND 6,7,8 U1 AAT3183 JP1 Figure 1: AAT3183 Evaluation Board Schematic. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202273A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 17, 2012 1 EVALUATION BOARD DATA SHEET EV148 Evaluation Board for the AAT3183 300 mA Inductorless Step-Down Converter Bill of Materials (BOM) Component Part Number U1 AAT3183IJS C1608X5R1C225K GRM188R61C225K C1005X5R1A105K GRM155R61A474K C1608X5R1A475K LMK107BJ475K CRCW06031001F PRPN401PAEN C1 C2 C3 R1 JP1 Description Manufacturer Inductorless Step-Down Converter Skyworks TDK Murata TDK Murata TDK Taiyo Yuden Vishay Sullins Electronics Ceramic Capacitor: 2.2µF, 16V, 0603, X5R Ceramic Capacitor: 1µF, 10V, 0603, X5R Ceramic Capacitor: 4.7µF, 10V, 0603, X5R Resistor: 1kΩ, 1%, 1/10W Connecting Header, 2mm Table 2: Component Listing. Setup 1. Configure the specified test equipment as shown in Figure 2, where JP1 options are illustrated. 2. 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 AAT3183 evaluation board. 3. An 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 the input power source remote sense terminals to the VIN and GND terminals on the AAT3183 evaluation board (optional, not shown in Figure 2). 2 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202273A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 17, 2012 EVALUATION BOARD DATA SHEET EV148 Evaluation Board for the AAT3183 300 mA Inductorless Step-Down Converter Figure 2: AAT3183 Evaluation Board Connection Diagram with Jumper 1 Settings. Evaluation/Testing Enabling [Jumper 1 initially in ON position on JP1] 1.Turn-Off With input voltage applied, remove Jumper 1 and re-insert in the OFF position on JP1. The output voltage will decay to zero. 2.Turn-On With input voltage applied, remove Jumper 1 on JP1 and re-insert in the ON position on JP1. The output voltage will recover to its nominal DC value of 1.5V. Load and Line Regulation 1. Enable the AAT3183 by placing Jumper 1 in the ON position on JP1, as shown in Figure 2. 2. Turn on the input power supply and set to desired input voltage based on the DC voltmeter. 3. Vary the output load from 0 to 300mA and vary the input voltage from 2.7 to 5.5V while monitoring the output voltage. Be careful to provide enough headroom for the AAT3183 to maintain the 1.5V output voltage, for further information regarding input voltage headroom please consult the “Applications Information” section of the AAT3183 datasheet. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202273A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 17, 2012 3 EVALUATION BOARD DATA SHEET EV148 Evaluation Board for the AAT3183 300 mA Inductorless Step-Down Converter Printed Circuit Board Figure 3: AAT3183 Evaluation Board Top Layer (not to scale). Figure 4: AAT3183 Evaluation Board Bottom Layer (not to scale). Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. 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