Evaluation Board User Guide UG-055 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 Setting Up the Evaluation Board for the ADP122/ADP123 FEATURES GENERAL DESCRIPTION Input voltage range: 2.3 V to 5.5 V Output current range: 0 mA to 300 mA Output voltage accuracy: ±1% Operating temperature range: −40°C to +125°C This user guide explains the functionality of the ADP122/ ADP123 linear regulators. Simple device measurements, such as line and load regulation, dropout voltage, and ground current can be achieved with only a single voltage supply, a voltage meter, a current meter, and load resistors. For more information about the ADP122/ADP123 linear regulators, see the ADP122/ADP123 data sheets. 08524-001 08524-002 EVALUATION BOARD CONNECTION DIAGRAMS Figure 2. ADP123 PCB Layout Figure 1. ADP122 PCB Layout PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. A | Page 1 of 12 UG-055 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Load Regulation Measurements ..................................................5 General Description ......................................................................... 1 Dropout Voltage Measurements..................................................5 Evaluation Board Connection Diagrams ...................................... 1 Ground Current Measurements ......................................................6 Revision History ............................................................................... 2 Ground Current Consumption ...................................................7 Evaluation Board Hardware ............................................................ 3 Ordering Information .......................................................................8 Evaluation Board Configurations .............................................. 3 Bill of Materials for the Evaluation Board .................................8 Output Voltage Measurements ....................................................... 4 Bill of Materials for the ADP122UJZ-REDYKIT ......................8 Line Regulation Measurements .................................................. 5 REVISION HISTORY 6/10—Rev. 0 to Rev. A Changes to Figure 10 ........................................................................ 6 Changes to Bill of Materials for the ADP122UJZ-REDYKIT Section ................................................................................................ 8 3/10—Revision 0: Initial Version Rev. A | Page 2 of 12 Evaluation Board User Guide UG-055 EVALUATION BOARD HARDWARE EVALUATION BOARD CONFIGURATIONS Table 1. Evaluation Board Hardware Components The ADP122/ADP123 evaluation boards are supplied with different components, depending on the version that is ordered. Components common to both versions are C1, C2, TP1, TP2, and J1. Figure 3 and Figure 4 show the schematics of the ADP122 and ADP123 evaluation board configurations. Table 1 describes the components. Component U1 1 C1 C2 J1 TP1 TP2 1 VIN VOUT 5 C1 C2 U1 J1 VOUT 2 GND 3 EN NC 4 Figure 3. ADP122 Evaluation Board Schematic TP1 TP2 1 VIN 2 GND 3 EN C1 Component depends on evaluation board type ordered. VOUT VOUT 5 U1 J1 1 R1 TP3 C2 ADJ 4 R2 08524-004 VIN TP1 TP2 TP3 R1, R2 08524-003 VIN Description ADP122/ADP123 low dropout linear regulators Input bypass capacitor, 1 μF, 0603 size Output capacitor, 1 μF, 0603 size Jumper (connects EN to VIN for automatic startup) Test point closer to VIN Test point closer to VOUT Test point closer to ADJ (ADP123 evaluation board only) 0603 size feedback resistors between VOUT and ADJ (ADP123 evaluation board only) Figure 4. ADP123 Evaluation Board Schematic Rev. A | Page 3 of 12 UG-055 Evaluation Board User Guide OUTPUT VOLTAGE MEASUREMENTS VOLTMETER VOLTAGE SOURCE 1.99711 + + – – 08524-005 LOAD Figure 5. ADP122 Output Voltage Measurement Setup VOLTMETER VOLTAGE SOURCE 1.99711 + + – – 08524-006 LOAD Figure 6. ADP123 Output Voltage Measurement Setup Figure 5 and Figure 6 show how the evaluation boards can be connected to a voltage source and a voltage meter for basic output voltage accuracy measurements. A resistor can be used as the load for the regulator. Ensure that the resistor has a power rating that is adequate to handle the power that is expected to dissipate across it. An electronic load can also be used as an alternative. Ensure that the voltage source can supply enough current for the expected load levels. 2. Follow these steps to connect to a voltage source and voltage meter: When these steps are completed, the voltage source can be turned on. If J1 is inserted (connecting EN to VIN for automatic startup), the regulator powers up. 1. Connect the negative terminal (−) of the voltage source to one of the GND pads on the evaluation board. 3. 4. 5. Rev. A | Page 4 of 12 Connect the positive terminal (+) of the voltage source to the VIN pad of the evaluation board. Connect a load between the VOUT pad and one of the GND pads. Connect the negative terminal (−) of the voltmeter to one of the GND pads. Connect the positive terminal (+) of the voltmeter to the VOUT pad. Evaluation Board User Guide UG-055 If the load current is large, the user must connect the voltmeter as close as possible to the output capacitor to reduce the effects of IR drops. 3.2945 LINE REGULATION MEASUREMENTS 3.2930 For line regulation measurements, the output of the regulator is monitored while its input is varied. For good line regulation, the output must change as little as possible with varying input levels. To ensure that the device is not in dropout mode during this measurement, VIN must be varied between VOUTNOM + 0.3 V (or 2.3 V, whichever is greater) and VINMAX. 3.2925 3.2940 VOUT (V) 3.2935 3.2915 3.2910 3.2905 3.2895 0.1 1 10 100 1000 IOUT (mA) 08524-008 3.2900 For example, for the ADP122 with a fixed 3.3 V output, VIN must be varied between 3.6 V and 5.5 V. This measurement can be repeated under different load conditions. Figure 7 shows the typical line regulation performance of the ADP122 with a fixed 3.3 V output. Figure 8. Output Voltage (VOUT) vs. Load Current (IOUT) at VIN = 3.6 V, VOUT = 3.3 V, TA = 25°C DROPOUT VOLTAGE MEASUREMENTS 3.296 Dropout voltage can be measured using the configurations shown in Figure 5 and Figure 6. Dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal output voltage. This applies only to output voltages above 2.3 V. Dropout voltage increases with larger loads. 3.294 3.292 3.290 IOUT = 100µA IOUT = 1mA IOUT = 10mA IOUT = 100mA IOUT = 200mA IOUT = 300mA 3.286 3.284 3.6 3.8 4.0 4.2 4.4 4.6 VIN (V) 4.8 5.0 5.2 5.4 For more accurate measurements, a second voltmeter can be used to monitor the input voltage across the input capacitor. The input supply voltage may need to be adjusted to account for IR drops, especially if large load currents are used. Figure 9 shows the typical curve of dropout voltage measurements with different load currents. 70 Figure 7. Output Voltage (VOUT) vs. Input Voltage (VIN) at TA = 25°C 60 LOAD REGULATION MEASUREMENTS 50 DROPOUT (mV) For load regulation measurements, the output of the regulator is monitored while the load is varied. For good load regulation, the output must change as little as possible with varying load. The input voltage must be held constant during this measurement. The load current can be varied from 0 mA to 300 mA. Figure 8 shows the typical load regulation performance of the ADP122 with a fixed 3.3 V output for an input voltage of 3.6 V. 40 30 20 10 0 1 10 100 IOUT (mA) 1000 08524-009 3.288 08524-007 VOUT (V) 3.2920 Figure 9. Dropout Voltage vs. Load Current (IOUT) at VOUT = 3.3 V, TA = 25°C Rev. A | Page 5 of 12 UG-055 Evaluation Board User Guide GROUND CURRENT MEASUREMENTS VOLTAGE SOURCE – + AMMETER 0.00112 + LOAD 08524-010 – Figure 10. ADP122 Ground Current Measurement Setup VOLTAGE SOURCE – + AMMETER 0.00112 + LOAD Figure 11. ADP123 Ground Current Measurement Setup Rev. A | Page 6 of 12 08524-011 – Evaluation Board User Guide UG-055 Figure 10 and Figure 11 show how the evaluation boards can be connected to a voltage source and an ammeter for ground current measurements. A resistor can be used as the load for the regulator. Ensure that the resistor has a power rating that is adequate to handle the power that is expected to dissipate across it. An electronic load can be used as an alternative. Ensure that the voltage source can supply enough current for the expected load levels. GROUND CURRENT CONSUMPTION Follow these steps to connect to a voltage source and ammeter: When the device is disabled (EN = GND), the ground current drops to less than 1 μA. 3. 4. 200 IOUT = 300mA 180 160 When these steps are completed, the voltage source can be turned on. If J1 is inserted (connecting EN to VIN for automatic startup), the regulator powers up. 140 IOUT = 200mA 120 IOUT = 100mA 100 IOUT = 10mA 80 IOUT = 1mA 60 IOUT = 100µA 40 20 0 3.6 3.8 4.0 4.2 4.4 4.6 VIN (V) 4.8 5.0 5.2 5.4 08524-012 2. Connect the positive terminal (+) of the voltage source to the VIN pad of the evaluation board. Connect the positive terminal (+) of the ammeter to one of the GND pads on the evaluation board. Connect the negative terminal (−) of the ammeter to the negative (−) terminal of the voltage source. Connect a load between the VOUT pad of the evaluation board and the negative (−) terminal of the voltage source. GROUND CURRENT (µA) 1. Ground current measurements can determine how much current the internal circuits of the regulator consume while the circuits perform the regulation function. To be efficient, the regulator must consume as little current as possible. Typically, the regulator uses the maximum current when supplying its largest load level (300 mA). Figure 12 shows the typical ground current consumption for various load levels at VOUT = 3.3 V and TA = 25°C. Figure 12. Ground Current vs. Input Voltage (VIN) at VOUT = 3.3 V, TA = 25°C Rev. A | Page 7 of 12 UG-055 Evaluation Board User Guide ORDERING INFORMATION To evaluate the ADP123, use the ADP123-EVALZ and change the feedback resistors on the board to meet the output voltage requirement. To evaluate the ADP122, use the ADP122-3.3EVALZ with a 3.3 V fixed output or the ADP122UJZ-REDYKIT. The ADP122UJZ-REDYKIT allows simplified prototyping and evaluation and is available for every standard fixed output voltage option in the ADP122 product family. The kit allows the user to evaluate the different voltage options with one easy-to-order kit. RedyKit is a trademark of Analog Devices, Inc. 08524-013 The ADP122UJZ-REDYKIT contains two evaluation boards and additional surface-mount ADP122 parts with different output voltages. The ADP122 parts come sorted and stored in the kit with the Analog Devices, Inc., part number and fixed output voltage clearly printed on each zip-top bag. A different part from the kit can be easily soldered onto one of the evaluation boards supplied with the kit. Figure 13. ADP122UJZ-REDYKIT BILL OF MATERIALS FOR THE EVALUATION BOARD Table 2. Reference Designator C1, C2 R1, R2 (ADP123 only) J1 U1 Description Capacitor, MLCC, 1 μF, 16 V, 0603, X5R 100 kΩ, 0603 size resistors Jumper, single, STR, two pins IC, LDO regulator Manufacturer Murata (or equivalent) Vishay Sullins Connector Solutions Analog Devices, Inc. Part No. GRM188R61C105KA93 CRCW06031003F PEC02SAAN ADP122AUJZ-3.3-R7 ADP123AUJZ-R7 BILL OF MATERIALS FOR THE ADP122UJZ-REDYKIT Table 3. Model ADP122AUJZ-2.5-R7 ADP122AUJZ-2.7-R7 ADP122AUJZ-2.8-R7 ADP122AUJZ-2.85-R7 ADP122AUJZ-2.9-R7 ADP122AUJZ-3.0-R7 ADP122AUJZ-3.3-R7 ADP122-BL1-EVZ ADP122-3.3-EVALZ Output Voltage (V) 2.5 2.7 2.8 2.85 2.9 3.0 3.3 2.5 3.3 Rev. A | Page 8 of 12 Package Description 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT Evaluation Board Evaluation Board Evaluation Board User Guide UG-055 NOTES Rev. A | Page 9 of 12 UG-055 Evaluation Board User Guide NOTES Rev. A | Page 10 of 12 Evaluation Board User Guide UG-055 NOTES Rev. A | Page 11 of 12 UG-055 Evaluation Board User Guide NOTES 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. ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG08524-0-6/10(A) Rev. A | Page 12 of 12