User's Guide ROHM Nano EnergyTM Switching Regulator Solutions BD70522GUL Ultra-Low Iq Buck Converter Evaluation Board Introduction This application note will provide the steps necessary to operate and evaluate ROHM's synchronous buck DC/DC converter using the BD70522GUL evaluation board. Component selection and operating procedures are included. Description The BD70522GUL converter is a power supply solution designed for battery powered devices. 180nA quiescent current and ULP (Ultra Low Power) mode enable excellent light load efficiency at 10A load, extending battery life, while output currents up to 500mA are supported. Users can select from among 9 preset output voltages via the VSEL pin. And when the input voltage gets close to the output voltage, the IC enters 100% ON mode that stops switching operation. Features Applications Nano EnergyTM Up to 90% efficiency at 10A output current 9 selectable output voltages (1.2V, 1.5V, 1.8V, 2.0V, 2.5V, 2.8V, 3.0V, 3.2V, 3.3V) Power Good output 100% ON Mode for low input voltage Discharge function on VOUT. Smoke detectors Thermostats Portable devices Wearables Low-Iq sets without standby switcher Energy harvesting Key Specifications Input voltage range Output voltage range Maximum output current Operation quiescent current Standby current VCSP50L1C package 2.5 to 5.5V 1.2 to 3.3V 500mA 180nA 50nA Evaluation Board Operating Limits and Absolute Maximum Ratings Parameter Symbol Supply Voltage Limit Unit MIN TYP MAX VSYS 2.5 - 5.5 V Output Current IOUT - - 0.5 A PG Sink Current IPG - - 10 mA (c) 2017 ROHM Co., Ltd. 1/9 Conditions No. 60UG055E Rev.001 NOV.2017 User's Guide BD70522GUL Evaluation Board Figure 1: BD70522GUL Evaluation Board Board Schematic Figure 2: BD70522GUL Evaluation Board Schematic (c) 2017 ROHM Co., Ltd. 2/9 No. 60UG055E Rev.001 NOV.2017 User's Guide BD70522GUL Output Voltage Settings Below is a table of output voltages selectable using the VSEL1 and VSEL2 pins. VSET 1.2V 1.5V 1.8V 2.0V 2.5V 2.8V 3.0V 3.2V 3.3V VSEL1 GND OPEN GND VIN OPEN VIN OPEN GND VIN VSEL2 OPEN GND GND GND VIN OPEN OPEN VIN VIN Table 1: Output Voltage Settings EN Pin High GND BD70522GUL Condition Enable Shutdown Table 2: EN Pin Settings Evaluation Board BOM Below is a table showing the Bill of Materials. Part numbers and suppliers are included. Reference Part Number Manufacturer U1 C2 C3,C4,C5 C1 L1 R1 R2 BD70522GUL JMK107BBJ226MA JMK107BBJ226MA EMK212ABJ106KD-T MAMK2520H2R2M PMR03EZPJ000 MCR01MRTF1002 J1,J2,J3, SW1 61300311121 SW1 N/A ROHM TAIYO YUDEN TAIYO YUDEN TAIYO YUDEN TAIYO YUDEN ROHM ROHM Wurth Electronics VSYS, VO 5000 GND1,GND3 5001 EN,GND2,GND4,PG,VSEL1,VSEL2 N/A Keystone Electronics Keystone Electronics Description [Unit: inch] Qty. 22uF, 10V, X5R, 0603 22uF, 10V, X5R, 0603 10uF, 16V, X5R, 0805 2.2uH, 2.8A, 2520 0, 0603 10k, 0402 1 1 3 1 1 1 1 2.54mm, 3pin, straight 4 Red Test Point 2 Black Test Point 2 Table 3: Bill of Materials Board Operating Procedure 1. 2. 3. 4. 5. 6. Set the output voltage using the jumper settings at J1 and J2. (refer to Table 1) Disable the IC by setting the SW1 jumper to the upper position (EN GND). Connect the power supply's GND terminal to the GND1 or GND3 test point on the evaluation board. Connect the power supply's VCC terminal to the Vsys test point on the evaluation board. This will provide VIN to the IC. Please note that VIN should be in the range of 2.5V to 5.5V. Connect the electronic load to GND1 or GND3 and VO. Connect the voltmeter to GND1 or GND3 and VO. Turn on the power supply and enable the IC by setting the jumper at SW1 to the lower position (EN VSYS). The output voltage can be measured at test point VO. Now turn on the load. The load can be increased up to 0.5A (max.). (c) 2017 ROHM Co., Ltd. 3/9 No. 60UG055E Rev.001 NOV.2017 User's Guide BD70522GUL Reference Application Data The following are graphs of the hot plugging test, efficiency, switching frequency, load response, output voltage, ripple, startup and shutdown. (Unless otherwise indicated, L=2.2uH, Cout=22Fx1, Ta=25C) 95.0 95.0 90.0 90.0 85.0 85.0 80.0 80.0 75.0 75.0 Efficiency: [%] Efficiency: [%] Typical Performance Curves 70.0 65.0 60.0 65.0 60.0 VIN=2.6V VIN=3.6V 55.0 70.0 VIN=2.6V VIN=3.6V 55.0 VIN=4.2V 50.0 VIN=4.2V VIN=5.0V 50.0 VIN=5.0V VIN=5.5V 45.0 0.001 0.01 0.1 1 10 100 VIN=5.5V 45.0 0.001 1000 0.01 Output Current: IOUT[mA] 100.0 100.0 95.0 95.0 90.0 90.0 85.0 85.0 80.0 80.0 75.0 70.0 10 VIN=3.6V VIN=3.6V 60.0 VIN=4.2V VIN=5.0V 55.0 VIN=5.0V VIN=5.5V VIN=5.5V 50.0 0.001 0.01 0.1 1 10 100 50.0 0.001 1000 Output Current: IOUT[mA] 0.01 0.1 1 10 100 1000 Output Current: IOUT[mA] Figure 5. Efficiency vs Output Current (VOUT=2.5V) (c) 2017 ROHM Co., Ltd. 1000 70.0 VIN=4.2V 55.0 100 75.0 65.0 VIN=2.8V 60.0 1 Figure 4. Efficiency vs Output Current (VOUT=1.8V) Efficiency: [%] Efficiency: [%] Figure 3. Efficiency vs Output Current (VOUT=1.2V) 65.0 0.1 Output Current: IOUT[mA] Figure 6. Efficiency vs Output Current (VOUT=3.3V) 4/9 No. 60UG055E Rev.001 NOV.2017 User's Guide BD70522GUL 1200 1200 1100 1100 1000 1000 900 900 800 800 Switching Frequency: F SW[kHz] Switching Frequency: FSW[kHz] Typical Performance Curves (continued) 700 600 500 400 300 700 600 500 400 300 200 VIN=2.6V 200 100 VIN=3.6V 100 VIN=5.5V 0 0 100 200 300 400 VIN=2.6V VIN=3.6V VIN=5.5V 0 500 0 100 Output Current: IOUT[mA] 1200 1100 1100 1000 1000 900 900 800 800 Switching Frequency: FSW[kHz] Switching Frequency: FOSW[kHz] 1200 700 600 500 400 300 VIN=3.6V 0 100 200 300 400 500 400 300 VIN=3.6V VIN=5.5V 0 500 0 Output Current: IOUT[mA] 100 200 300 400 500 Output Current: IOUT[mA] Figure 9. Switching Frequency vs Output Current (VOUT=2.5V) (c) 2017 ROHM Co., Ltd. 500 600 100 VIN=5.5V 0 400 700 200 VIN=2.8V 100 300 Figure 8. Switching Frequency vs Output Current (VOUT=1.8V) Figure 7. Switching Frequency vs Output Current (VOUT=1.2V) 200 200 Output Current: IOUT[mA] Figure 10. Switching Frequency vs Output Current (VOUT=3.3V) 5/9 No. 60UG055E Rev.001 NOV.2017 User's Guide BD70522GUL Typical Performance Curves (continued) Droop=137.5mV Overshoot=66.9mV Droop=113.9mV Overshoot=65.1mV VOUT VOUT IOUT IOUT Figure 12. Load Transient Response (VIN=3.6V, VOUT=1.8V, IOUT=1uA500mA, tr=tf=1s) Figure 11. Load Transient Response (VIN=3.6V, VOUT=1.2V, IOUT=1uA500mA, tr=tf=1s) Droop=174.9mV Overshoot=85.6mV Droop=260.2mV Overshoot=88.1mV VOUT VOUT IOUT IOUT Figure 13. Load Transient Response (VIN=3.6V, VOUT=2.5V, IOUT=1uA500mA, tr=tf=1s) (c) 2017 ROHM Co., Ltd. Figure 14. Load Transient Response (VIN=3.6V, VOUT=3.3V, IOUT=1uA500mA, tr=tf=1s) 6/9 No. 60UG055E Rev.001 NOV.2017 User's Guide BD70522GUL 1.236 1.854 1.224 1.836 1.212 1.818 Output Voltage: VOUT[V] Output Voltage: VOUT[V] Typical Performance Curves (continued) 1.200 1.188 VIN=2.6V 1.800 1.782 VIN=2.6V VIN=3.6V 1.176 VIN=3.6V 1.764 VIN=4.2V VIN=4.2V VIN=5.0V 1.164 0.001 VIN=5.0V VIN=5.5V 0.01 0.1 1 10 100 1.746 0.001 1000 VIN=5.5V 0.01 Output Current: IOUT[mA] 1 10 2.550 3.366 2.525 3.333 Output Voltage: VOUT[V] 3.399 2.500 2.475 VIN=2.8V 3.300 3.267 VIN=3.6V VIN=3.6V VIN=4.2V 3.234 VIN=4.2V VIN=5.0V VIN=5.0V 2.425 0.001 VIN=5.5V VIN=5.5V 0.01 0.1 1 10 100 3.201 0.001 1000 Output Current: IOUT[mA] 0.01 0.1 1 10 100 1000 Output Current: I OUT[mA] Figure 17. Output Voltage vs Output Current (Load Regulation, VOUT=2.5V) (c) 2017 ROHM Co., Ltd. 1000 Figure 16. Output Voltage vs Output Current (Load Regulation, VOUT=1.8V) 2.575 2.450 100 Output Current: IOUT[mA] Figure 15. Output Voltage vs Output Current (Load Regulation, VOUT=1.2V) Output Voltage: VOUT[V] 0.1 Figure 18. Output Voltage vs Output Current (Load Regulation, VOUT=3.3V) 7/9 No. 60UG055E Rev.001 NOV.2017 User's Guide BD70522GUL Typical Performance Curves (continued) 50.0 50.0 VIN=2.6V VIN=3.6V 45.0 VIN=2.6V VIN=3.6V 45.0 VIN=5.5V VIN=5.5V 40.0 Output Ripple Voltage: VRIP[mVpp] Output Ripple Voltage: V RIP[mVpp] 40.0 35.0 30.0 25.0 20.0 15.0 35.0 30.0 25.0 20.0 15.0 10.0 10.0 5.0 5.0 0.0 0.0 0 100 200 300 400 500 0 100 Output Current: IOUT[mA] Figure 19. Output Ripple Voltage vs Output Current (Peak to Peak Output Ripple Voltage, VOUT=1.2V) 50.0 300 500 50 VIN=3.6V VIN=3.6V 45 VIN=5.5V VIN=5.5V 40 Output Ripple Voltage: VRIP[mVpp] 40.0 Output Ripple Voltage: VRIP[mVpp] 400 Figure 20. Output Ripple Voltage vs Output Current (Peak to Peak Output Ripple Voltage, VOUT=1.8V) VIN=2.8V 45.0 200 Output Current: IOUT[mA] 35.0 30.0 25.0 20.0 15.0 35 30 25 20 15 10.0 10 5.0 5 0.0 0 0 100 200 300 400 500 0 Output Current: IOUT[mA] 200 300 400 500 Output Current: IOUT[mA] Figure 21. Output Ripple Voltage vs Output Current (Peak to Peak Output Ripple Voltage, VOUT=2.5V) (c) 2017 ROHM Co., Ltd. 100 Figure 22. Output Ripple Voltage vs Output Current (Peak to Peak Output Ripple Voltage, VOUT=3.3V) 8/9 No. 60UG055E Rev.001 NOV.2017 User's Guide BD70522GUL Typical Performance Curves (continued) VEN VEN VLX VLX tSDELAY=4.50ms tSS=2.54ms VPG VPG VOUT tSDELAY=4.51ms tSS=2.57ms VOUT Figure 24. Startup (VIN=3.6V, VOUT=2.5V, IOUT=500mA, EN=0VIN) Figure 23. Startup (VIN=3.6V, VOUT=2.5V, IOUT=0mA, EN=0VIN) VEN VEN VOUT VOUT tSD=134.2us tSD=2.45ms (50%EN20%VOUT) (50%EN20%VOUT) Figure 25. Shutdown (VIN=3.6V, VOUT=2.5V, IOUT=0mA, EN=VIN0) (c) 2017 ROHM Co., Ltd. Figure 26. Shutdown (VIN=3.6V, VOUT=2.5V, IOUT=500mA, EN=VIN0) 9/9 No. UG055E Rev.001 NOV.2017 Notice Notes 1) The information contained herein is subject to change without notice. 2) Before you use our Products, please contact our sales representative and verify the latest specifications : 3) Although ROHM is continuously working to improve product reliability and quality, semiconductors can break down and malfunction due to various factors. Therefore, in order to prevent personal injury or fire arising from failure, please take safety measures such as complying with the derating characteristics, implementing redundant and fire prevention designs, and utilizing backups and fail-safe procedures. ROHM shall have no responsibility for any damages arising out of the use of our Poducts beyond the rating specified by ROHM. 4) Examples of application circuits, circuit constants and any other information contained herein are provided only to illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. 5) The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM or any other parties. ROHM shall have no responsibility whatsoever for any dispute arising out of the use of such technical information. 6) The Products specified in this document are not designed to be radiation tolerant. 7) For use of our Products in applications requiring a high degree of reliability (as exemplified below), please contact and consult with a ROHM representative : transportation equipment (i.e. cars, ships, trains), primary communication equipment, traffic lights, fire/crime prevention, safety equipment, medical systems, servers, solar cells, and power transmission systems. 8) Do not use our Products in applications requiring extremely high reliability, such as aerospace equipment, nuclear power control systems, and submarine repeaters. 9) ROHM shall have no responsibility for any damages or injury arising from non-compliance with the recommended usage conditions and specifications contained herein. 10) ROHM has used reasonable care to ensure the accuracy of the information contained in this document. However, ROHM does not warrants that such information is error-free, and ROHM shall have no responsibility for any damages arising from any inaccuracy or misprint of such information. 11) Please use the Products in accordance with any applicable environmental laws and regulations, such as the RoHS Directive. For more details, including RoHS compatibility, please contact a ROHM sales office. ROHM shall have no responsibility for any damages or losses resulting non-compliance with any applicable laws or regulations. 12) When providing our Products and technologies contained in this document to other countries, you must abide by the procedures and provisions stipulated in all applicable export laws and regulations, including without limitation the US Export Administration Regulations and the Foreign Exchange and Foreign Trade Act. 13) This document, in part or in whole, may not be reprinted or reproduced without prior consent of ROHM. 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