User's Guide Switching Regulator Series Step-Down DC/DC Converter BD9A301MUV-LB Evaluation Board BD9A301MUV-EVK-001 BD9A301MUV-EVK-001 Evaluation board delivers an output 1.8 volts from an input 2.7 to 5.5 volts using BD9A301MUV-LB, a synchronous rectification step-down DC/DC converter integrated circuit, with output current rating of maximum 3A. It offers high efficiency in all load ranges by equipping the efficiency improvement function in light-load. The output voltage can be set by changing the external parts of circuit and the loopresponse characteristics also can be adjusted by the phase compensation circuit. Performance specification These are representative values, and it is not a guaranteed against the characteristics. VIN = 5.0V, VOUT = 1.8V, Unless otherwise specified. Parameter Input Voltage Range Min 2.7 Output Voltage Output Voltage Setting Range Output Current Range Typ Max Units 5.5 V 1.8 V 0.8 VINx0.7 V 0 3.0 A Conditions R1=30k, R2=24k Loop Band Width 89.1 kHz Phase Margin 54.1 degrees Input Ripple Voltage 140 mVpp IO = 3.0A Output Ripple Voltage 40 mVpp IO = 3.0A Output Rising Time 5 ms Operating Frequency 1.0 MHz Maximum Efficiency 91.8 % (c) 2017 ROHM Co., Ltd. 1/10 IO = 0.7A No. 60UG004E Rev.001 APR.2017 BD9A301MUV-EVK-001 User's Guide Operation Procedures 1. Necessary equipments (1) DC power-supply of 2.7V to 5.5V/3A (2) Maximum 3A load (3) DC voltmeter 2. Connecting the equipments (1) DC power-supply presets to 5.0V and then the power output turns off. (2) The maximum load should be set at 3A and over it will be disabled. (3) Check Jumper pin of SW1 is short, between intermediate-terminal and OFF-side terminal. (4) Connect positive-terminal of power-supply to VIN+ terminal and negative-terminal to GND-terminal with a pair of wires. (5) Connect load's positive-terminal to VOUT+ terminal and negative-terminal to GND-terminal with a pair of wires. (6) Connect positive-terminal of DC voltmeter 1 to TP1 and negative-terminal to TP2 for input-voltage measurement. (7) Connect positive-terminal of DC voltmeter 2 to TP3 and negative-terminal to TP4 for output-voltage measurement. (8) DC power-supply output is turned ON. (9) IC is enable (EN) by shorting Jumper-pin of SW1 between intermediate-terminal and ON-side terminal. (10) Check DC voltmeter 2 displays 1.8V. (11) The load is enabled. (12) Check at DC voltmeter 1 whether the voltage-drop (loss) is not caused by the wire's resistance. + + V DC Voltmeter 1 V DC Voltmeter 2 - - + + DC Power Load - - Figure 1. Connection Diagram Enable-Pin To minimize current consumption during standby-mode and normal operation, Enable-mode can be switched by controlling EN pin (15pin) of the IC. Standby-mode is enabled by shorting Jumper-pin of SW1 between intermediate-terminal and OFF-side terminal and normal-mode operation by shorting between intermediate-terminal and ON-side terminal. It also can be switched between standby-mode and normal-mode operation by removing Jumper-pin and controlling the voltage between EN and GND-terminal. Standby-mode is enabled when the voltage of EN is under 0.5V, and normal-mode operation when it is over 2.0V. (c) 2017 ROHM Co., Ltd. 2/10 No. 60UG004E Rev.001 APR.2017 BD9A301MUV-EVK-001 User's Guide Circuit Diagram U1 BD9A301MUV-LB VIN = 2.7V to 5.5V, VOUT = 1.8V PGD 14 PGD BOOT 13 R4 R7 TP1 TP3 J1 C3 C2 C1 VIN GND TP2 SW1 ON 16 AVIN C7 1 PVIN SW 12 2 PVIN SW 11 3 PGND SW 10 4 PGND SS 9 L1 J2 C4 C5 C6 VOUT TP4 TP5 GND TP7 C9 15 EN OFF R3 R5 8 MODE R6 5 AGND 17 EPAD ITH 7 C8 R1 FB 6 TP6 C10 R2 Figure 2. BD9A301MUV-EVK-001 Circuit Diagram Bill of Materials Count Reference Designator Type Value Description Manufacturer Part Number Manufacturer Configuration (mm) 2 C1, C7 Ceramic Capacitor 0.1F 50V, B, 10% GRM188B31H104KA92D MURATA 1608 1 C2 Ceramic Capacitor 10F 16V, B, 10% GRM31CB31C106KA88L MURATA 3216 0 C3 Ceramic Capacitor - Not installed 2 C4, C5 Ceramic Capacitor 22F 6.3V, B, 20% 0 C6 Ceramic Capacitor - Not installed 1 C8 Ceramic Capacitor 3300pF 50V, B, 10% 1 C9 Ceramic Capacitor 0.01F 50V, B, 10% 0 C10 Ceramic Capacitor - 1 L1 Inductor 1.5H 30%, DCR=14.3mmax, 7.3A CLF7045T-1R5N 1 R1 Resistor 30k 1/10W, 50V, 1% MCR03EZPFX3002 1 R2 Resistor 24k 1/10W, 50V, 1% MCR03EZPFX2402 ROHM 1608 1 R3 Resistor 9.1k 1/10W, 50V, 1% MCR03EZPFX9101 ROHM 1608 1 R4 Resistor 10k 1/10W, 50V, 1% MCR03EZPFX1002 ROHM 1608 2 R5, R7 Resistor 0 Jumper MCR03EZPJ000 ROHM 1608 0 R6 Resistor - - 1608 USECONN - 1 SW1 1 U1 2 J1, J2 - - 3216 MURATA 2012 - - 2012 GRM188B11H332KA01D MURATA 1608 GRM188B11H103KA01D MURATA 1608 - - 1608 TDK 7269 ROHM 1608 GRM21BB30J226ME38L Not installed Not installed PH-1x03SG Pin header - 2.54mm x 3 contacts IC - Buck DC/DC Converter Terminal Block - 2 contacts, 15A, 14 to 22AWG Jumper - Jumper pin for SW1 61300311121 1 - (c) 2017 ROHM Co., Ltd. 3/10 BD9A301MUV-LB TB111-2-2-U-1-1 OSTTC022162 MJ254-6BK 969102-0000-DA Wurth Electronics Inc. - ROHM VQFN016V3030 Alphaplus Connectors & Cables On Shore Technology Inc USECONN 3M - No. 60UG004E Rev.001 APR.2017 BD9A301MUV-EVK-001 User's Guide Layout PCB size50mmx50mmx1.6mm Figure 3. Top Silk Screen (Top view) Figure 4. Top Silk Screen and Layout (Top view) (c) 2017 ROHM Co., Ltd. 4/10 No. 60UG004E Rev.001 APR.2017 BD9A301MUV-EVK-001 User's Guide Figure 5. Top Side Layout (Top view) Figure 6. L2 Layout (Top view) (c) 2017 ROHM Co., Ltd. 5/10 No. 60UG004E Rev.001 APR.2017 BD9A301MUV-EVK-001 User's Guide Figure 7. L3 Layout (Top view) Figure 8. Bottom Side Layout (Top view) (c) 2017 ROHM Co., Ltd. 6/10 No. 60UG004E Rev.001 APR.2017 BD9A301MUV-EVK-001 User's Guide Reference Application Data 100 1 90 0.8 Output Voltage Change (%) 80 VO=1.8V Efficiency (%) 70 VIN=3.3V 60 VIN=5.0V 50 40 30 20 10 IO=1.0A 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 0 0.001 -1 0.01 0.1 Load Current (A) 1 10 2 Figure 9. Efficiency vs Load Current 3 3.5 4 4.5 Input Voltage (V) 5 5.5 6 Figure 10. Line Regulation VIN = 5.0V VO = 1.8V 0.5 VO (AC) 50mV/div 0.4 Output Voltage Change (%) 2.5 VO=1.8V 0.3 0.2 VIN=3.3V IO: 1A/div 0.1 IO: 0.75A2.25A0.75A 0 Time scale 2ms/div -0.1 VIN = 5.0V VO = 1.8V VIN=5.0V -0.2 VO (AC) 50mV/div -0.3 -0.4 -0.5 0 0.5 1 1.5 2 Load Current (A) 2.5 IO: 1A/div 3 IO: 10mA3A10mA Figure 11. Load Regulation Time scale 2ms/div Figure 12. Load Transient Characteristics (c) 2017 ROHM Co., Ltd. 7/10 No. 60UG004E Rev.001 APR.2017 BD9A301MUV-EVK-001 User's Guide Phase Gain (dB) Phase (deg) Gain fC = 63.1kHz Phase margin = 66.1deg Gain margin = 17.5dB Frequency (Hz) Figure 13. Loop Response VIN = 3.3V, VO = 1.8V, IO = 1.0A Phase Gain (dB) Phase (deg) Gain fC = 89.1kHz Phase margin = 54.1deg Gain margin = 15.5dB Frequency (Hz) Figure 14. Loop Response VIN = 5.0V, VO = 1.8V, IO = 1.0A (c) 2017 ROHM Co., Ltd. 8/10 No. 60UG004E Rev.001 APR.2017 BD9A301MUV-EVK-001 User's Guide IO = 0A IO = 0A VIN (AC) VIN (AC) 50mV/div 50mV/div Time scale 500ns/div Time scale 50ns/div IO = 3.0A IO = 3.0A VIN (AC) VIN (AC) 50mV/div 50mV/div Time scale 500ns/div Time scale 500ns/div Figure 16. Input Voltage Ripple Wave Figure 15. Input Voltage Ripple Wave VIN = 5.0V, VO = 1.8V VIN = 3.3V, VO = 1.8V IO = 0A IO = 0A VO (AC) VO (AC) 50mV/div 50mV/div Time scale 5ms/div Time scale 5ms/div IO = 3.0A IO = 3.0A VO (AC) VO (AC) 50mV/div 50mV/div Time scale 5ms/div Time scale 5ms/div Figure 18. Output Voltage Ripple Wave Figure 17. Output Voltage Ripple Wave VIN = 5.0V, VO = 1.8V VIN = 3.3V, VO = 1.8V (c) 2017 ROHM Co., Ltd. 9/10 No. 60UG004E Rev.001 APR.2017 BD9A301MUV-EVK-001 User's Guide VIN 2V/div EN 2V/div VO 1V/div Time scale 5ms/div Figure 19. Start-up EN = VIN VIN = 3.3V, VO = 1.8V, IO = 0A Time scale 5ms/div Figure 20. Power-down EN = VIN VIN = 3.3V, VO = 1.8V, IO = 0A VIN 2V/div EN 2V/div VO 1V/div Time scale 5ms/div Figure 21. Start-up EN = VIN VIN = 5.0V, VO = 1.8V, IO = 0A Time scale 5ms/div Figure 22. Power-down EN = VIN VIN = 5.0V, VO = 1.8V, IO = 0A VIN 2V/div EN 2V/div VO 1V/div Time scale 2ms/div Figure 23. Start-up by EN VIN = 3.3V, VO = 1.8V, IO = 0A Time scale 500ms/div Figure 24. Power-down by EN VIN = 3.3V, VO = 1.8V, IO = 0A VIN 2V/div EN 2V/div VO 1V/div Time scale 2ms/div Figure 25. Start-up by EN VIN = 5.0V, VO = 1.8V, IO = 0A (c) 2017 ROHM Co., Ltd. 10/10 Time scale 500ms/div Figure 26. Power-down by EN VIN = 5.0V, VO = 1.8V, IO = 0A No. 60UG004E Rev.001 APR.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. 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