ADP2360CP-EVALZ User Guide UG-930 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 ADP2360 DC-to-DC Switching Regulator FEATURES GENERAL DESCRIPTION Input voltage range: 4.5 V to 60 V Output voltage: 3.3 V Power good The ADP2360CP-EVALZ evaluation board demonstrates the functionality of the ADP2360 dc-to-dc converter. Use this board to evaluate simple device measurements, such as line regulation, load regulation, and efficiency. The evaluation board provides a power-good output and other features such as soft start time, and the maximum inductor current can be modified by changing component values. EVALUATION KIT CONTENTS ADP2360CP-EVALZ evaluation board ADDITIONAL EQUIPMENT NEEDED DC power supply Multimeters for voltage and current measurements Electronic (ELOAD) or resistive loads Full specifications for the ADP2360 dc-to-dc converter are available in the product data sheet, which should be consulted in conjunction with this user guide when working with the evaluation board. EVALUATION BOARD 14190-001 ADP2360 Figure 1. ADP2360CP-EVALZ LFCSP Evaluation Board PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 8 UG-930 ADP2360CP-EVALZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Line Regulation..............................................................................5 Evaluation Kit Contents ................................................................... 1 Load Regulation ............................................................................5 Additional Equipment Needed ....................................................... 1 Efficiency ........................................................................................5 General Description ......................................................................... 1 Evaluation Board Schematic ............................................................6 Evaluation Board .............................................................................. 1 Evaluation Board Layout ..................................................................7 Revision History ............................................................................... 2 Ordering Information .......................................................................8 Evaluation Board Hardware ............................................................ 3 Bill of Materials ..............................................................................8 Measurement Setup .......................................................................... 4 Output Voltage Measurements ....................................................... 5 REVISION HISTORY 5/2016—Revision 0: Initial Version Rev. 0 | Page 2 of 8 ADP2360CP-EVALZ User Guide UG-930 EVALUATION BOARD HARDWARE settings; refer to the ADP2360 data sheet to obtain alternative component values. The evaluation board is configured to provide a 3.3 V output from a 4.5 V to 60 V input. Table 2 lists the components for the ADP2360CP-EVALZ evaluation board. Figure 2 outlines the board features available to the user. The evaluation board allows the end user to customize the design including modification of the soft start and peak current ENABLE; CAN BE CONNECTED EXTERNALLY TO CENTER PIN POWER INPUT MAXIMUM INDUCTOR CURRENT; RITH CONTROLS SETTING POWER GOOD; HIGH OUTPUT WHEN GOOD ADP2360 SWITCH NODE; CAN MONITOR WAVEFORM ON OSCILLOSCOPE POWER OUTPUT GND GND 14190-002 SOFT START; CSS CONTROLS SETTING Figure 2. Evaluation Board Features Table 1. Evaluation Board Function Descriptions Jumper/Connector Mnemonic VIN VOUT GND1, GND2 EN PG SW Description Power supply to the ADP2360. This connector can be connected to a supply between 4.5 V and 60 V. Output from the ADP2360. The output voltage is 3.3 V in the default configuration. Ground. Precision enable. The EN pin is compared to an internal precision reference to enable the regulator output. Connect this jumper to the on position to turn on the regulator. Connect this jumper to the off position or remove this jumper to turn the regulator off (an internal pull-down is present in the ADP2360). An external enable can be connected to the center pin. Power-good output. This pin is an open-drain, power-good indicator and is pulled up to VIN by the PG resistor. Note that as a 22 MΩ resistor is used to pull up the PG pin, a high impedance meter is required for accurate measurement. This resistor value is selected to minimize power when the device is not enabled. Switch node. This node allows the switching waveform to be viewed on an oscilloscope. Rev. 0 | Page 3 of 8 UG-930 ADP2360CP-EVALZ User Guide MEASUREMENT SETUP The setup in Figure 3 is suggested for evaluating the device. For efficiency measurements, an additional voltmeter connected between GND1 and VIN is preferred to ensure that the voltage is measured as close to the device as possible and to eliminate voltage drop from the power lead impedance. ADP2360 V I ELOAD PSU V 14190-003 V I Figure 3. Measurement Setup Rev. 0 | Page 4 of 8 ADP2360CP-EVALZ User Guide UG-930 OUTPUT VOLTAGE MEASUREMENTS LOAD REGULATION For basic output voltage accuracy measurements, connect the evaluation board to a voltage source and a voltmeter. Use a resistor or an electronic load as the load for the regulator. When using a resistive load, ensure that the resistor has an adequate power rating to handle the expected power dissipation. Ensure that the voltage source can supply up to 500 mA. Complete the following steps to connect to a voltage source and voltmeter: Connect the negative (−) terminal of the voltage source to the GND1 terminal. Connect the positive (+) terminal of the voltage source to the VIN terminal. Connect a load between the VOUT terminal and the GND1 terminal. Connect the voltmeter in parallel with the load resistor. 2. 3. 4. Turn the voltage source on and move the EN jumper to the on position. If long power leads are used from the power supply, especially at higher loads, connect a large capacitor (5000 μF or more) across the VIN terminal to prevent losses from lead inductance. Measure the input voltage at these terminals or use a power supply with a 4-wire supply and sense arrangement. EFFICIENCY For efficiency measurements, monitor the regulator input and output while the load is varied. The input voltage must be held constant during this measurement. Keep power leads short during this test and use a power supply with remote sense. Connect ammeters in series with the input and output. Connect voltmeters to the printed circuit board (PCB) side of the ammeter and measure the voltage across the input and output terminals. For the best results, measure the voltage across the input and output capacitors. If possible, particularly at low currents, trigger the meters simultaneously and set to average readings for a period of a few hundred milliseconds or more. Averaging the readings removes the switching ripple and skip mode effects. Figure 5 shows typical efficiency curves. 100 90 LINE REGULATION 80 For line regulation measurements, monitor the regulator output while its input is varied. For good line regulation, the output must change as little as possible with varying input levels. It is possible to repeat this measurement under different load conditions. During line regulation tests, keep the power supply leads short and remove any additional input capacitor. Figure 4 shows the typical line regulation performance of the ADP2360 at both the output and feedback pins. EFFICIENCY (%) 70 50 40 30 20 VIN = 9V VIN = 12V VIN = 24V VIN = 48V 10 1.0 0 0 0.8 0.01 0.02 0.03 0.04 0.05 0.06 0.07 LOAD (A) 0.6 Figure 5. Efficiency vs. Load, VOUT = 3.3 V Fixed, RITH = 0 Ω, TA = 25°C 0.4 0.2 0 –0.2 –0.4 –0.6 –0.8 –1.0 0 10 20 30 40 50 60 VIN (V) 14190-004 VOUT VARIATION FROM AVERAGE (%) 60 Figure 4. Line Regulation, VOUT = 3.3 V Fixed, RITH = 0 Ω, Load= 10 mA Rev. 0 | Page 5 of 8 14190-005 1. For load regulation measurements, monitor the regulator output while the load is varied. For good load regulation, the output must change as little as possible with varying loads. The input voltage must be held constant during this measurement. Keep power leads short during this test and use a power supply with remote sense. UG-930 ADP2360CP-EVALZ User Guide EVALUATION BOARD SCHEMATIC RPG CIN U1 ADP2360ACPZ EN PG ITH FB VIN VIN SW SW PGND SS SS PAD L1 CSS RFB1 CFF RFB2 RITH EN PG ITH FB AGND Figure 6. Evaluation Board Schematic for the ADP2360 Rev. 0 | Page 6 of 8 COUT 1 2 3 REN2 EN SW PG 1 2 3 VOUT 3 2 1 GND1 3 2 1 GND2 14190-006 3 2 1 REN1 VIN ADP2360CP-EVALZ User Guide UG-930 14190-007 14190-008 EVALUATION BOARD LAYOUT Figure 7. PCB Top Copper Layer Figure 8. PCB Bottom Copper Layer Rev. 0 | Page 7 of 8 UG-930 ADP2360CP-EVALZ User Guide ORDERING INFORMATION BILL OF MATERIALS Table 2. Evaluation Board Components 1 Component U1 COUT L1 RFB1 RFB2 Package LFCSP 2220 WE-TPC 0805 0805 RITH 0805 RPG CIN CFF 0805 2220 0603 VIN, VOUT, GND1, GND2, EN, PG N/A 1 Description ADP2360 LFCSP Output capacitor Inductor Top feedback resistor Bottom feedback resistor Maximum inductor current selection resistor Power-good resistor Input capacitor Feedforward capacitor Pin headers Value ADP2360 10 μF 100 μH 357 kΩ 115 kΩ Tolerance N/A 10% 30% 1% 1% Voltage Adjustable 50 V N/A N/A N/A Part Number ADP2360ACPZ-R7 GRM32ER71H106KA12L 744043101 N/A N/A Manufacturer Analog Devices, Inc. Murata Würth N/A N/A 0Ω 1% N/A N/A N/A 22 MΩ 10 μF 10 pF 1% 20% 5% N/A 100 V 50 V N/A C5750X7S2A106M230KB GRM1885C1H100JA01D N/A TDK Murata N/A N/A N/A N/A N/A N/A means not applicable. 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. ©2016 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG14190-0-5/16(0) Rev. 0 | Page 8 of 8