ADP5302-EVALZ

ADP5302-EVALZ User Guide UG-880 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com Evaluating the ADP5302 Ultralow Step-Down Regulator The ADP5302-EVALZ evaluation board provides an easy way to evaluate the device. This user guide describes how to quickly set up the board to collect performance data. GENERAL DESCRIPTION The ADP5302 is an ultralow power, synchronous step-down dcto-dc regulator with a load switch in a 10-lead LFCSP package. The ADP5302 runs from input voltages of 2.15 V to 6.50 V and requires minimal external components to provide a high efficiency solution with an integrated power switch, synchronous rectifier, and internal compensation. Complete information about the ADP5302 is available in the ADP5302 data sheet, which should be consulted in conjunction with this user guide when using the evaluation board. 13506-001 ADP5302 EVALUATION BOARD Figure 1. PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 7 UG-880 ADP5302-EVALZ User Guide TABLE OF CONTENTS General Description ......................................................................... 1 Measuring Evaluation Board Performance .................................4 ADP5302 Evaluation Board ............................................................ 1 Evaluation Board Schematic ............................................................5 Revision History ............................................................................... 2 Evaluation Board Layout ..................................................................6 Evaluation Board Software Quick Start Procedures .................... 3 Ordering Information .......................................................................7 Configuring the Board................................................................. 3 Bill of Materials ..............................................................................7 REVISION HISTORY 11/15—Revision 0: Initial Version Rev. 0 | Page 2 of 7 ADP5302-EVALZ User Guide UG-880 EVALUATION BOARD SOFTWARE QUICK START PROCEDURES CONFIGURING THE BOARD Output Load Connection The ADP5302 evaluation board is fully assembled and tested. Before applying power to the evaluation board, follow the setup procedures in this section. Before connecting the load to the ADP5302 evaluation board, ensure that the board is turned off. If the load includes a current meter or if the current is not measured, connect the load directly to the evaluation board as follows: Jumper Settings 1. Table 1 describes the jumper settings. Before selecting the jumper settings, ensure that the enable input, EN, is high. 2. Table 1. Jumper Settings Jumper J5 (EN) J8 (VID) J6 (SYNC) J7 (VIN OK) State or Connection High Low VIN GND Floating VIN GND External frequency VIN VOUT Function Enable VOUT Disable VOUT 2.5 V 3V Program VOUT by an external resistor Pulse-width modulation (PWM) mode Hysteresis mode Set the frequency from 1.2 MHz to 2.5 MHz Pull VIN OK to VIN Pull VIN OK to VOUT Input Power Source Connection Before connecting the power source to the ADP5302 evaluation board, ensure that the board is turned off. If the input power source includes a current meter, use the meter to monitor the input current as follows: 1. 2. Connect the positive terminal of the power source to the VIN terminal (J1) on the evaluation board. Connect the negative terminal of the power source to the GND terminal (J3) on the board. If the power source does not include a current meter, connect a current meter in series with the input source voltage as follows: 1. 2. 3. Connect the positive terminal of the power source to the positive terminal (+) of the current meter. Connect the negative terminal of the power source to the GND terminal (J3) on the evaluation board. Connect the negative terminal (−) of the current meter to the VIN terminal (J1) on the evaluation board. Connect the positive load connection (+) to the VOUT terminal (J2). Connect the negative load connection (−) to the GND terminal (J4). If a current meter is used, connect it in series with the load as follows: 1. 2. 3. Connect the positive terminal (+) of the current meter to the VOUT terminal (J2) on the evaluation board. Connect the negative terminal (−) of the current meter to the positive terminal (+) of the load. Connect the negative terminal (−) of the load to the GND terminal (J4) on the evaluation board. Input and Output Voltmeter Connections Measure the input and output voltages with voltmeters. Ensure that the voltmeters are connected to the appropriate test points on the board. If the voltmeters are not connected to the correct test points, the measured voltages may be incorrect due to the voltage drop across the leads or due to the connections between the board, the power source, and/or the load. 1. 2. 3. 4. Connect the positive terminal (+) of the input voltage measuring voltmeter to Test Point TP1 on the evaluation board. Connect the negative terminal (−) of the input voltage measuring voltmeter to Test Point TP5 on the board. Connect the positive terminal (+) of the output voltage measuring voltmeter to Test Point TP4 on the board. Connect the negative terminal (−) of the output voltage measuring voltmeter to Test Point TP7 on the board. Power On the Evaluation Board When the power source and load are connected to the ADP5302-EVALZ evaluation board, the board can be powered on. If the input power source exceeds 2.06 V (typical), the output voltage rises to 1.8 V by default. Rev. 0 | Page 3 of 7 UG-880 ADP5302-EVALZ User Guide MEASURING EVALUATION BOARD PERFORMANCE Measuring the Switching Waveform To observe the switching waveform with an oscilloscope, place the oscilloscope probe tip at the TP2 and TP5 test points with the probe ground connected to GND. Set the oscilloscope to a dc coupling, 2 V/division, 1 µs/division time base. The switching waveform alternates between 0 V and the approximate input voltage. Measuring Load Regulation Test load regulation by increasing the load at the output and measuring the output voltage between the TP4 and TP7 test points. the oscilloscope to an ac coupling, 10 mV/division, 2 µs/division time base and 20 MHz bandwidth. A standard oscilloscope probe has a long wire ground clip. For high frequency measurements, this ground clip picks up high frequency noise and injects it into the measured output ripple. Figure 2 shows a simple way to properly measure the output ripple. It requires removing the oscilloscope probe sheath and wrapping a nonshielded wire around the oscilloscope probe. By keeping the ground lengths of the oscilloscope probe as short as possible, true ripple can be measured. Measuring Line Regulation Vary the input voltage and measure the output voltage at a fixed output current. The input voltage can be measured between the TP1 and TP5 test points. The output voltage is measured between the TP4 and TP7 test points. Measuring Efficiency The efficiency, η, is measured by comparing the input power with the output power. η = VOUT × I OUT V IN × I IN Measure the inductor current by removing one end of the inductor from the pad on the board and using a wire connected between the pad and the inductor. A current probe can then be used to measure the inductor current. Measuring Output Voltage Ripple To observe the output voltage ripple, place an oscilloscope probe across Output Capacitors C1, C8, and C10 with the probe ground lead placed at the negative capacitor terminal (−) and the probe tip placed at the positive capacitor terminal (+). Set 13506-002 Measuring Inductor Current Figure 2. Output Ripple Measurement Output Voltage Change The output voltage of the evaluation board is preset to 1.8 V. However, the output voltage can be adjusted with an external VID resistor (see the ADP5302 data sheet). Rev. 0 | Page 4 of 7 ADP5302-EVALZ User Guide UG-880 EVALUATION BOARD SCHEMATIC TP1 VIN_SNS J1 VIN 1 U1 VIN C2 10µF/ 10V 2 SYNC/MODE 3 VID 4 FB 5 TP5 GND_SNS ADP5302 STOP SW SYNC/MODE PGND VID AGND FB VINOK R1 19.6kΩ 1 2 1 TP2 SW 10 9 SW TP4 VOUT_SNS L1 2.2µH 2 J2 1 VOUT 2 1 8 VOUT 7 6 TP6 VINOK 11 J3 GND PVIN 1 1 STOP EN 1 C1 NC 1 EPAD TP3 STOP EN 1 1 2 C4 10µF/ 10V NC TP7 GND_SNS J4 1 2 1 R2 1MΩ C3 J5 EN R3 0Ω 1 2 3 1 TP9 GND 1 TP8 GND J6 SYNC GND 1 2 3 VIN J7 VIN_OK 1 2 3 J8 VID 13506-003 1 2 3 Figure 3. Schematic of the ADP5302 Evaluation Board Rev. 0 | Page 5 of 7 UG-880 ADP5302-EVALZ User Guide 13506-004 EVALUATION BOARD LAYOUT 13506-005 Figure 4. Top Layer Figure 5. Second Layer Rev. 0 | Page 6 of 7 ADP5302-EVALZ User Guide UG-880 ORDERING INFORMATION BILL OF MATERIALS Table 2. ADP5302 Evaluation Board Bill of Materials Qty. 2 2 1 1 2 1 1 1 1 1 Reference Designator C1, C4 C2, C3 J1 J2 J3, J4 J5 J6 J7 J8 L1 1 1 1 1 1 1 1 2 1 2 1 R1 R2 R3 TP1 TP2 TP3 TP4 TP5, TP7 TP6 TP8, TP9 U1 Description No connect 10 µF/10 V VIN VOUT GND EN SYNC VINOK VID 2.2 µH 2.2 µH 19.6 kΩ 1 MΩ 0Ω VIN_SNS SW STOP VOUT_SNS GND_SNS VINOK GND IC Part Number Not applicable GRM31CR71A106KA01 M20-9990245 M20-9990245 M20-9990245 M20-9990246 M20-9990246 M20-9990246 M20-9990246 LPS3015-222MR 74438334022 CRCW060319K6FKEA CRCW06031M00FKEA CRCW06030000FKEA M20-9990245 M20-9990245 M20-9990245 M20-9990245 M20-9990245 M20-9990245 M20-9990245 ADP5302ACPZ-1-R7 PCB Footprint C1206 C1206 SIP2 SIP2 SIP2 SIP3 SIP3 SIP3 SIP3 Inductor 45 × 32 Inductor 45 × 32 R0603 R0603 R0603 SIP1 SIP1 SIP1 SIP1 SIP1 SIP1 SIP1 10-lead, 3 mm × 3 mm LFCSP Vendor Not applicable Murata Harwin Harwin Harwin Harwin Harwin Harwin Harwin Coilcraft Würth Elektronik Vishay Dale Vishay Dale Vishay Dale Harwin Harwin Harwin Harwin Harwin Harwin Harwin Analog Devices, Inc. ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed. ©2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG13506-0-11/15(0) Rev. 0 | Page 7 of 7