EVAL-ADP5090 User Guide UG-708 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 ADP5090 Ultralow Power Boost Regulator GENERAL DESCRIPTION The ADP5090 is an ultralow, power synchronous, dc-to-dc boost regulator in a compact 3 mm × 3 mm LFCSP_WQ package. The ADP5090 runs from input voltages of 0.38 V to 3.3 V and requires minimal external components to provide a high efficiency solution with an integrated power switch, a synchronous rectifier, and battery management. The EVAL-ADP5090 evaluation board provides an easy way to evaluate the device. This user guide describes how to quickly set up the board and deliver up to 3.5 V maximum voltage to the SYS output using an external resistor divide. The internal switches turn on if the storage element voltage at the BAT pin is above the externally programmed SETSD voltage of 2.4 V. The PGOOD indicator toggles high when the SYS pin ramps up to 3 V. Complete information about the ADP5090 is available in the corresponding data sheet. Consult the data sheet in conjunction with this user guide when using the evaluation board. 12384-001 THE EVAL-ADP5090 EVALUATION BOARD Figure 1. Photograph of the EVAL-ADP5090 Evaluation Board PLEASE SEE THE LAST PAGE FOR AN IMPORTANT WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | Page 1 of 8 UG-708 EVAL-ADP5090 User Guide TABLE OF CONTENTS General Description ......................................................................... 1 Measuring the EVAL-ADP5090 Performance ..........................4 The EVAL-ADP5090 Evaluation Board ........................................ 1 Evaluation Board Schematics...........................................................6 Revision History ............................................................................... 2 Evaluation Board Layout ..................................................................7 Setting Up the Evaluation Board .................................................... 3 Ordering Information .......................................................................8 Powering Up the Evaluation Board ............................................ 3 Bill of Materials ..............................................................................8 REVISION HISTORY 9/14—Revision 0: Initial Version Rev. 0 | Page 2 of 8 EVAL-ADP5090 User Guide UG-708 SETTING UP THE EVALUATION BOARD POWERING UP THE EVALUATION BOARD Output Load Connection The ADP5090 evaluation board is fully assembled and tested. Use the following setup procedures before applying power to the evaluation board, Table 1 describes the jumper settings. Before connecting the load to the EVAL-ADP5090 evaluation board, ensure that the SYS voltage is higher than the end of the cold-startup threshold (VSYS_TH, 1.93 V typical), or that the PGOOD signal is high. If the load includes a current meter or if the current is not measured, connect the load directly to the evaluation board as follows: Table 1. Jumper Settings 1. Jumper Settings Jumper J1 (DIS_SW) J2 (PGOOD) J3 (RDIV) State or Connection SYS GND Not applicable MPPT Floating Function Disables the main boost Enables the main boost Pull high when the SYS voltage ramps up to preset the SETPG rising threshold With MPPT sensing function Without MPPT sensing function; provide an external voltage at the CBP pin as the MPPT voltage 2. If a current meter is used, connect it in series with the load as follows: 1. 2. 3. Input Power Source Connection Energy harvesting power sources are high impedance sources. As Figure 2 shows, a source meter configured as a current source with a voltage limit set to the open circuit voltage of the harvester is the best way to simulate the harvester. For a low output impedance power supply (voltage source), it is necessary to simulate the impedance of the harvester with a physical resistor, R, between the supply and the VIN pin. If the input current source includes a voltage meter, use the meter to monitor the input voltage as follows: 2. Connect the positive terminal (+) of the current meter to the SYS terminal (J4) 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. Storage Elements Connection The EVAL-ADP5090 can charge some types of energy storage elements, such as rechargeable batteries, super capacitors, and conventional capacitors. In general, the storage elements maintain constant power or peak power of the system that cannot directly come from the input source. It is necessary to consider any significant leakage current of batteries and super capacitors. For applications information, refer to the ADP5090 data sheet. Connect the positive terminal of the power source to the VIN terminal (J6) on the evaluation board. Connect the negative terminal of the power source to the GND terminal (J6) on the evaluation board. SUPER CAPACITOR OR RECHARGEABLE BATTERY If the input power supply does not include a current meter, connect a current meter in series with the input power supply as follows: 1. 2. 3. Connect the external series resistor of the power source to the positive terminal (+) of the current meter. Connect the negative terminal of the power source to the GND terminal (J6) on the evaluation board. Connect the negative terminal (−) of the current meter to the VIN terminal (J6) on the evaluation board. R – + CURRENT SOURCE WITH VOLTAGE LIMIT – + VOLTAGE SOURCE Figure 2. Setup for the EVAL-ADP5090 Evaluation Board Rev. 0 | Page 3 of 8 12384-002 1. Connect the positive load connection (+) to the SYS terminal (J4) on the evaluation board. Connect the negative load connection (−) to the GND terminal (J4) on the evaluation board. UG-708 EVAL-ADP5090 User Guide Input and Output Voltmeter Connections MEASURING THE EVAL-ADP5090 PERFORMANCE Measure the input and output voltages with voltmeters. Ensure that the voltmeters connect 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. To connect the voltmeters, use the following procedure: Measuring the Switching Waveform 1. Measuring Efficiency 2. 3. 4. Connect the positive terminal (+) of the input voltage measuring voltmeter to Test Point TP5 on the evaluation board. Connect the negative terminal (−) of the input voltage measuring voltmeter to Test Point TP6 on the board. Connect the positive terminal (+) of the output voltage measuring voltmeter to Test Point TP2 on the board. Connect the negative terminal (−) of the output voltage measuring voltmeter to Test Point TP9 on the board. To observe the switching waveform with an oscilloscope, place the oscilloscope probe tip at Test Point TP4 with the probe ground connected to the GND pin. Set the oscilloscope to a dc coupling, 2 V/division, 10 μsec/division time base. The switching waveform alternates between 0 V and the approximate SYS voltage. Measure the efficiency, η, by comparing the input power with the output power. Figure 3 shows the test setup. Float the RDIV jumper (J3) and provide an external voltage at the CBP pin as the MPPT voltage so that the input voltage is regulated to this voltage. With a voltage source meter capable of sinking current to connect to the SYS pin, obtain the output voltage and output current. η Powering On the Evaluation Board If the open circuit voltage (OCV) of the input current source is above a minimum input voltage of 0.38 V for cold-start (typical), and the input power is above the 16 μW minimum input power of cold-start (typical), the EVAL-ADP5090 enters cold-startup when the SYS voltage is below VSYS_TH. When the SYS voltage is above VSYS_TH, the board exits cold-startup and enables the main boost. After cold-startup, the MPPT sampling circuit is active and the harvester OCV is detectable because there is no input current to create a droop across the impedance. The main boost runs and draws current until the VIN voltage drops to the sampled MPPT voltage stored at the CBP pin. Optional BACK_UP Setup An optional primary battery connected to the BACK_UP pin can accelerate the cold-startup or maintain the system load. When the voltage at the BACK_UP pin is higher than the voltage at the BAT pin, the ADP5090 turns on the internal power MOSFETs between the BACK_UP pin and the SYS pin. When the BACK_UP pin voltage is lower than the BAT pin voltage, the internal power MOSFETs turn off. VSYS I SYS VIN I IN Measuring the Inductor Current 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. Then, use a current probe to measure the inductor current. Measuring the Output Voltage Ripple To observe the output voltage ripple, place an oscilloscope probe across Output Capacitor C1 with the probe ground lead placed at the negative capacitor terminal (−) and the probe tip placed at the positive capacitor terminal (+). Set the oscilloscope to an ac coupling, 50 mV/division, 1 sec/division time base and a 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. To eliminate the noise injection, remove the oscilloscope probe sheath and wrap a nonshielded wire around the oscilloscope probe. By keeping the ground lengths of the oscilloscope probe as short as possible, the true ripple can be measured. Rev. 0 | Page 4 of 8 EVAL-ADP5090 User Guide UG-708 Output Voltage Change To prevent deeply discharging storage elements at the BAT pin, the voltage threshold can be programmed using the following equation: The output voltage of the EVAL-ADP5090 is preset to 3.5 V. However, the output voltage can be adjusted using the following equation: 3 R3 VREF 1 2 R6 where VREF, the typical internal reference voltage, is 1.21 V. VOLTAGE SOURCE METER (CURRENT SINK) INPUT VOLTAGE REGULATION REFERENCE (MPPT RATIO x OCV) – + CURRENT SOURCE WITH VOLTAGE LIMIT Figure 3. Test Setup for Measuring the Efficiency of the EVAL-ADP5090 Rev. 0 | Page 5 of 8 12384-003 VSYS R2 VSETSD VREF 1 R5 UG-708 EVAL-ADP5090 User Guide EVALUATION BOARD SCHEMATICS J1 1 2 3 J2 1 2 TP1 BACK_UP 1 10 1 9 L1 2 C3 22µH PGND SY S J5 2 1 1 TP4 SW BAT TP5 VIN J6 1 2 1 C4 10nF J7 R8 4.7MΩ R9 18MΩ TP6 C5 C6 4.7µF/ 10V 3 2 1 0.1µF MPPT RDIV CBP VIN TP8 1 1 GND GND GND TP9 1 TP10 1 TP11 1 GND GND GND Figure 4. Schematic of the EVAL-ADP5090 Rev. 0 | Page 6 of 8 TP7 1 12384-004 5 VIN SW TP3 BAT 1 PGOOD 13 14 DIS_SW 15 REF BAT MINOP BACK_UP J4 2 1 100µF/ 6.3V R7 NC AGND 12 11 C2 8 4 7 R6 5.11MΩ SY S CBP R5 4.99MΩ BACK_UP TERM MPPT R4 4.02MΩ 3 SETSD 6 2 C1 0.1µF 1 TP2 SY S U1 ADP5090 4.7µF/ 10V SETPG 17 R3 4.87MΩ 16 R2 4.99MΩ EXP R1 6.04MΩ J3 2 1 1 PGOOD SY S DIS_SW GND EVAL-ADP5090 User Guide UG-708 EVALUATION BOARD LAYOUT 12384-005 Figure 5 and Figure 6 show the top and bottom layers of the EVAL-ADP5090. 12384-006 Figure 5. EVAL-ADP5090, Top Layer Figure 6. EVAL-ADP5090, Bottom Layer Rev. 0 | Page 7 of 8 UG-708 EVAL-ADP5090 User Guide ORDERING INFORMATION BILL OF MATERIALS Table 2. The ADP5090 Evaluation Board Bill of Materials Quantity 2 2 1 1 1 1 1 1 1 1 1 1 Reference Designator C1, C6 C2, C5 C3 C4 J1 J2 J3 J4 J5 J6 J7 L1 1 2 1 1 1 1 1 1 1 1 1 1 1 6 1 R1 R2, R5 R3 R4 R6 R7 R8 R9 TP1 TP2 TP3 TP4 TP5 TP6, TP7, TP8, TP9, TP10, TP11 U1 Description Capacitor, 4.7 μF, 10 V Capacitor, 0.1 μF Capacitor, 100 μF, 6.3 V Capacitor, 10 nF DIS_SW PGOOD BACK_UP SYS BAT VIN RDIV Inductor, 22 μH Inductor, 22 μH Resistor, 6.04 MΩ Resistor, 4.99 MΩ Resistor, 4.87 MΩ Resistor, 4.02 MΩ Resistor, 5.11 MΩ Resistor, 20k Resistor, 4.7 MΩ Resistor, 18 MΩ BACK_UP SYS BAT SW VIN GND IC Part Number GRM21BR61A475KA73 GRM188R71H104KA93 C4532X5R0J107M280KA GRM188R71H103KA01 M20-9990246 M20-9990245 M20-9990246 LPS4018-223MLB 74437324220 CRCW06036M04FKTA CRCW06034M99FKEA CRCW06034M87FKEA CRCW06034M02FKEA CRCW06035M11FKEA CRCW060320K0FKEA CRCW06034M70FKEA RK73B1JTTD186J M20-9990245 M20-9990245 M20-9990245 M20-9990245 M20-9990245 M20-9990245 ADP5090ACPZ-1-R7 PCB Footprint C0805 C0603 C1812 C0603 SIP3 SIP2 SIP2_big SIP2_big SIP2_big SIP2_big SIP3 Inductor_4x4 Inductor_4x4 R0603 R0603 R0603 R0603 R0603 R0603 R0603 R0603 SIP1 SIP1 SIP1 SIP1 SIP1 SIP1 LFCSP16-3x3PL Vendor Murata Murata TDK Murata Harwin Harwin Harwin Harwin Harwin Harwin Harwin Coilcraft Wurth Vishay Dale Vishay Dale Vishay Dale Vishay Dale Vishay Dale Vishay Dale Vishay Dale KOA Harwin Harwin Harwin Harwin Harwin Harwin Analog Devices 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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