Evaluation Board User Guide UG-279 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 Evaluation Board for the ADP5033 Micro PMU FEATURES GENERAL DESCRIPTION Full-featured evaluation board for the ADP5033 Standalone capability Simple device measurements, including line and load regulation, demonstrable with A voltage supply A voltmeter An ammeter Load resistors Easy access to external components Cascading options to supply the LDO from either buck Dedicated enable option for each channel Mode option to change bucks from PSM to PWM operation The ADP5033 evaluation board is a two-step-down regulator with a two-LDO solution that enables evaluation of the ADP5033. The evaluation board is available in standard voltage options. DOCUMENTS NEEDED ADP5033 data sheet The ADP5033 uses a proprietary high speed, current mode, constant frequency PWM control scheme for excellent stability and transient response. To ensure the longest battery life in portable applications, the ADP5033 features a power save mode (PSM) that reduces the switching frequency under light load conditions, as well as the option to change the mode to fixed PWM operation. The 3 MHz switching frequency minimizes the size of the external components. The low quiescent current, low dropout voltage, and wide input voltage range of the ADP5033 LDO extends the battery life of portable devices. Full details on the ADP5033 are provided in the ADP5033 data sheet available from Analog Devices, Inc., which should be consulted in conjunction with this evaluation board user guide. 09879-010 TOP LAYER OF THE EVALUATION BOARD Figure 1. Top Layer, Recommended Layout PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 12 UG-279 Evaluation Board User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Measuring Evaluation Board Performance ...................................3 Documents Needed.......................................................................... 1 Measuring Output Voltage ...............................................................6 General Description ......................................................................... 1 Measuring Ground Current .............................................................7 Top Layer of the Evaluation Board................................................. 1 Evaluation Board Schematics and Artwork...................................8 Revision History ............................................................................... 2 Ordering Information.................................................................... 10 Using the Evaluation Board............................................................. 3 Bill of Materials........................................................................... 10 Powering Up the Evaluation Board............................................ 3 REVISION HISTORY 8/11—Revision 0: Initial Version Rev. 0 | Page 2 of 12 Evaluation Board User Guide UG-279 USING THE EVALUATION BOARD POWERING UP THE EVALUATION BOARD Input and Output Voltmeters The ADP5033 evaluation board is supplied fully assembled and tested. Before applying power to the evaluation board, follow the procedures in this section. Measure the input and output voltages with voltmeters. Make sure that the voltmeters are connected to the appropriate evaluation board terminals and not to the load or power source themselves. Enable JP4 (EnA) and JP5 (EnB) When the ADP5033 has an input voltage above the minimum UVLO setting, the ADP5033 BUCK2 and LDO1 are enabled by connecting JP4 (EnA) from Pin 1 to Pin 2. BUCK1 and LDO2 are enabled by connecting JP5 (EnB) from Pin 1 to Pin 2. Jumper JP3 (Mode) Jumper JP3 (Mode) pulled high to J1 (VIN_1) forces BUCK1 and BUCK2 into forced PWM operation. JP3 (Mode) pulled low to J11 (GND1) allows BUCK1 and BUCK2 to operate in automatic PWM/PSM operation. Input Power Source If the input power source includes a current meter, use that meter to monitor the input current. Connect the positive terminal of the power source to J1 (VIN_1) on the evaluation board, and the negative terminal of the power source to J11 (GND1). If the power source does not include a current meter, connect a current meter in series with the input source voltage. Connect the positive lead (+) of the power source to the ammeter positive (+) connection, the negative lead (−) of the power source to J11 (GND1) on the evaluation board, and the negative lead (−) of the ammeter to J1 (VIN_1) on the board. Be aware that the current meters add resistance to the input source and this voltage reduces with high output currents. If the voltmeters are not connected directly to the evaluation board, the measured voltages will be incorrect due to the voltage drop across the leads and/or connections between the evaluation board, the power source, and/or the load. Connect the input voltage measuring voltmeter positive terminal (+) to the evaluation board via J1 (VIN_1), and the negative (−) terminal to the evaluation board via J11 (GND1) . Connect the output voltage measuring voltmeter positive (+) terminal to the evaluation board via J5 (VOUT1) for measuring the output voltage of BUCK1 and the negative (−) terminal to the evaluation board via J8 (PGND). Turning On the Evaluation Board When the power source and load are connected to the ADP5033 evaluation board, the board can be powered for operation. Perform the following steps: 1. 2. Ensure that the power source voltage is greater than 4.2 V but less than 5.5 V. Ensure that the desired channel is enabled, and monitor the output voltage. If the load is not already enabled, enable the load; check that it is drawing the proper current, and that the output voltage maintains voltage regulation. Output Load MEASURING EVALUATION BOARD PERFORMANCE Connect an electronic load or resistor to set the load current. If the load includes an ammeter, or if the current is not measured, connect the load directly to the evaluation board, with the positive (+) load connected to one of the channels. For example, connect BUCK1, J5 (VOUT1) and the negative (−) load connection to J8 (PGND). Measuring Output Voltage Ripple on the Buck Regulator If an ammeter is used, connect it in series with the load. Connect the positive (+) ammeter terminal to the evaluation board for BUCK1, J5 (VOUT1), the negative (−) ammeter terminal to the positive (+) load terminal, and the negative (−) load terminal to the evaluation board J8 (PGND). Measuring the Switching Waveform To observe the output voltage ripple of BUCK1, place an oscilloscope probe across the output capacitor (COUT_1) with the probe ground lead at the negative (−) capacitor terminal and the probe tip at the positive (+) capacitor terminal. Set the oscilloscope to ac, 20 mV/division, and 2 μs/division time base. To observe the switching waveform with an oscilloscope, place the oscilloscope probe tip at the end of the inductor with the probe ground at GND. Set the oscilloscope to dc, 2 V/division, and 2 μs/division time base. Rev. 0 | Page 3 of 12 UG-279 Evaluation Board User Guide 100 Measuring Load Regulation 3.325 VIN = 5V VOUT = 3.3V 3.320 90 PSM 80 70 EFFICIENCY (%) Test the load regulation by increasing the load at the output and looking at the change in output voltage. To minimize voltage drop, use short low resistance wires, especially for loads approaching maximum current. 60 50 40 30 PWM 10 3.310 0 1 10 1000 100 IOUT (mA) 3.305 09879-004 VOUT (V) VIN = 5V VOUT = 3.3V 20 3.315 Figure 4. Buck Efficiency Measuring Inductor Current 3.295 0 0.1 0.2 0.3 0.4 IOUT (A) 0.5 0.6 0.7 09879-002 3.300 Figure 2. Buck Load Regulation Line Regulation of LDOs Measuring Line Regulation For line regulation measurements, the regulator output 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 VOUT nominal + 0.5 V (or 2.3 V, whichever is greater) and VIN maximum. For example, a fixed 2.8 V output needs VIN to be varied between 3.3 V and 5.5 V. This measurement can be repeated under different load conditions. Figure 5 shows the typical line regulation performance of the LDO with fixed 2.8 V output. Vary the input voltage and examine the change in the output voltage. 1.810 VIN = 5V VOUT = 1.8V LOAD = 500mA 1.805 VOUT (V) Measure the inductor current by removing one end of the inductor from its pad and connecting a current loop in series. A current probe can be connected onto this wire. 1.800 2.805 1.795 2.800 4.7 4.9 5.1 VIN (V) 5.3 5.5 Figure 3. Buck Line Regulation VOUT (V) 4.5 09879-003 2.795 1.790 2.790 IOUT = 150mA IOUT = 100mA Measuring Efficiency IOUT = 10mA η= IOUT = 1mA IOUT = 100µA 2.780 VOUT × I OUT 3.1 V IN × I IN 3.3 3.5 3.7 3.9 4.1 4.3 4.5 VIN (V) 4.7 Figure 5. LDO Line Regulation Measure the input and output voltages as close as possible to the input and output capacitors to reduce the effect of IR drops. Rev. 0 | Page 4 of 12 4.9 5.1 5.3 5.5 09879-005 Measure the efficiency, η, by comparing the input power with the output power. 2.785 Evaluation Board User Guide UG-279 Load Regulation of LDO Dropout Voltage of LDO For load regulation measurements, the regulator output is monitored 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. The load current can be varied from 0 mA to 150 mA. Figure 6 shows the typical load regulation performance of the LDO with fixed 2.8 V output for an input voltage of 3.3 V. 2.810 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 for output voltages greater than 2.3 V. Dropout voltage increases with larger loads. 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. 2.808 Ground Current Consumption of LDO 2.806 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 needs to consume as little current as possible. Typically, the regulator uses the maximum current when supplying its largest load level (300 mA). When the device is disabled, the ground current drops to less than 1 mA. 2.804 2.800 2.798 2.796 2.794 2.792 2.790 0 0.02 0.04 0.06 0.08 IOUT (A) 0.10 0.12 0.14 09879-006 VOUT (V) 2.802 Figure 6. LDO Load Regulation Rev. 0 | Page 5 of 12 UG-279 Evaluation Board User Guide MEASURING OUTPUT VOLTAGE Figure 7 shows how the evaluation board can be connected to a voltage source and a voltmeter 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 adequate to handle the power expected to be dissipated 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. VOLTAGE SOURCE – VOLTMETER 1.99711 + – 09879-007 + Figure 7. Output Voltage Measurement Rev. 0 | Page 6 of 12 Evaluation Board User Guide UG-279 MEASURING GROUND CURRENT Figure 8 shows the evaluation board 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 VOLTAGE SOURCE expected to be dissipated across it. An electronic load can be used as an alternative. Ensure that the voltage source used can supply enough current for the expected load levels. AMMETER 0.00112 – + 09879-008 + – Figure 8. Ground Current Measurement Rev. 0 | Page 7 of 12 UG-279 Evaluation Board User Guide EVALUATION BOARD SCHEMATICS AND ARTWORK J1 VIN_1 U1 ADP5033 VIN1 C1 C5 4.7uF C0402std C4 A2 VIN2 A3 C6 4.7uF C0402std B1 B2 VIN1 L1 SW1 VIN2 VOUT1 BUCK1 VIN3 PGND1 VOUT1 MODE COUT_1 10uF C0603std D1 BUCK2 SW2 PGND2 LDO1 VOUT3 D3 C3 D4 J8 L2 CBMF1608 B3 C4 B4 ENA LDO2 VOUT4 VOUT2 VOUT2 A1 J6 COUT_2 10uF C0603std VIN4 1UF C0402std VOUT1 J5 C2 PGND AGND C7 1UF C0402std VIN_2 CBMF1608 VIN4 VOUT2 J2 D2 A4 PGND ENB J9 VOUT3 JP3 J10 Mode VOUT4 JP4 GND2 J7 PGND 3 2 1 3 2 1 COUT_4 1UF C0402std J14 PGND EnA J13 JP5 3 2 1 3 2 1 09879-009 J12 COUT_3 1UF C0402std 3 2 1 EnB Figure 9. Evaluation Board Schematic of ADP5033 09879-011 J11 GND1 3 2 1 Figure 10. Second Layer, Recommended Layout Rev. 0 | Page 8 of 12 UG-279 09879-012 Evaluation Board User Guide 09879-013 Figure 11. Third Layer, Recommended Layout Figure 12. Bottom Layer, Recommended Layout Rev. 0 | Page 9 of 12 UG-279 Evaluation Board User Guide ORDERING INFORMATION BILL OF MATERIALS Table 1. Qty. 1 2 3 2 2 Reference Designator U1 C5, C6 C7, C4, COUT_3, COUT_4 COUT_2, COUT_1 L1, L2 Description ADP5033 micro PMU—4 regulators Capacitor, MLCC, 4.7 μF, 6.3 V, 0402, X5R Capacitor, MLCC, 1.0 μF, 6.3 V, 0402, X5R Capacitor, MLCC, 10.0 μF, 6.3 V, 0603, X5R Inductor, 1.0 μH, 0.29 A, 90 mΩ Rev. 0 | Page 10 of 12 Manufacturer Analog Devices Panasonic—ECG Taiyo Yuden Taiyo Yuden Taiyo Yuden Part Number ADP5033 ECJ-0EB0J475M LMK105BJ105MV-F JMK107BJ106MA-T CBMF1608T1R0M Evaluation Board User Guide UG-279 NOTES Rev. 0 | Page 11 of 12 UG-279 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. 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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. ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. UG09879-0-8/11(0) Rev. 0 | Page 12 of 12