User's Guide Switching Regulator Series Step-Down DC/DC Converter BD9A101MUV-LB Evaluation Board BD9A101MUV-EVK-001 This evaluation board has been developed for ROHM's synchronous buck DC/DC converter customers evaluating BD9A101MUV-LB. While accepting a power supply of 2.7-5.5V, an output of 1.8V can be produced. The IC has internal 60m high-side N-channel MOSFET and 60m lowside N-channel MOSFET and a synchronization frequency is of 1MHz. A Soft Start circuit prevents in-rush current during startup. An EN pin allows for simple ON/OFF control of the IC to reduce standby current consumption. A MODE pin allows the user to select fixed frequency PWM mode or enables the light load mode control and the mode is automatically switched between the light load mode control and fixed frequency PWM mode. Include OCP (Over Current Protection) and SCP (Short Circuit Protection). Evaluation Board Operating Limits and Absolute Maximum Ratings (Ta=25) Parameter Symbol Supply Voltage Limit Unit MIN TYP MAX VCC 2.7 - 5.5 V VOUT - 1.8 - V IOUT - - 1 A Conditions Output Voltage / Current Evaluation Board Figure 1. BD9A101MUV-EVK-001 Evaluation Board (c) 2017 ROHM Co., Ltd. 1/9 No. 60UG002E Rev.001 APR.2017 BD9A101MUV-EVK-001 User's Guide Operation Procedures 1. Necessary equipments (1) DC power-supply of 2.7V to 5.5V/1A (2) Maximum 1A 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 1A 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 V DC Voltmeter 1 DC Voltmeter 2 - - + + DC Power Load - - Figure 2. 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. 2/9 No. 60UG002E Rev.001 APR.2017 BD9A101MUV-EVK-001 User's Guide Circuit Diagram U1 BD9A101MUV-LB VIN = 2.7V5.5V, 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 3. BD9A101MUV-EVK-001 Circuit Diagram Bill of Materials Count Reference Designator Type Value Manufacturer Part Number Description 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 - 3216 2 C4, C5 Ceramic Capacitor 22F 6.3V, B, 20% MURATA 2012 0 C6 Ceramic Capacitor - Not installed - 2012 1 C8 Ceramic Capacitor 2700pF 50V, B, 10% GRM188B11H272KA01D MURATA 1608 1 C9 Ceramic Capacitor 0.01F 50V, B, 10% GRM188B11H103KA01D MURATA 1608 0 C10 Ceramic Capacitor - - 1608 1 L1 Inductor 2.2H 20%, DCR=17mmax, 8.1A FDSD0630-H-2R2M TOKO 7066 1 R1 Resistor 30k 1/10W, 50V, 1% MCR03EZPFX3002 ROHM 1608 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 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 61300311121 1 - Jumper - Jumper pin for SW1 1 - PCB - FR4, 4-layer, 1oz (c) 2017 ROHM Co., Ltd. BD9A101MUV-LB TB111-2-2-U-1-1 OSTTC022162 MJ254-6BK 969102-0000-DA EVK029 Rev.A 3/9 Wurth Electronics Inc. - ROHM VQFN016V3030 USECONN 3M - Tamukai 50x50x1.6 Alphaplus Connectors & Cables On Shore Technology Inc No. 60UG002E Rev.001 APR.2017 BD9A101MUV-EVK-001 User's Guide Layout PCB size50mmx50mmx1.6mm Figure 4. Top Silk Screen (Top view) Figure 5. Top Silk Screen and Layout (Top view) (c) 2017 ROHM Co., Ltd. 4/9 No. 60UG002E Rev.001 APR.2017 BD9A101MUV-EVK-001 User's Guide Figure 6. Top Side Layout (Top view) Figure 7. L2 Layout (Top view) (c) 2017 ROHM Co., Ltd. 5/9 No. 60UG002E Rev.001 APR.2017 BD9A101MUV-EVK-001 User's Guide Figure 8. L3 Layout (Top view) Figure 9. Bottom Side Layout (Top view) (c) 2017 ROHM Co., Ltd. 6/9 No. 60UG002E Rev.001 APR.2017 BD9A101MUV-EVK-001 User's Guide Reference Application Data 100 0.4 90 0.3 Output Voltage Change (%) 80 VO=1.8V Efficiency (%) 70 VIN=3.3V 60 VIN=5.0V 50 40 30 20 0.2 0.1 0 -0.1 -0.2 -0.3 10 0 0.001 -0.4 0.01 0.1 Load Current (A) 1 2 Figure 10. Efficiency vs Load Current 2.5 3 3.5 4 4.5 Input Voltage (V) 5 5.5 6 Figure 11. Line Regulation 0.5 VIN = 5.0V VO = 1.8V 0.4 Output Voltage Change (%) VIN=5.0V 0.3 VO=1.8V VO (AC) 0.2 50mV/div 0.1 0 -0.1 IO: 0A1A0A -0.2 IO: 0.5A/div -0.3 -0.4 -0.5 0 0.2 0.4 0.6 Load Current (A) 0.8 Time scale 1ms/div 1 Figure 13. Load Transient Characteristics Figure 12. Load Regulation (c) 2017 ROHM Co., Ltd. 7/9 No. 60UG002E Rev.001 APR.2017 BD9A101MUV-EVK-001 User's Guide 80 180 60 135 Phase 90 Gain (dB) 20 45 0 0 Gain -20 -45 -40 -90 -60 -135 -80 Phase (deg) 40 -180 1000 10K 100K 1M Frequency (Hz) Figure 14. Loop Response VIN = 5.0V, VO = 1.8V, IO = 1.0A VIN (AC) 50mV/div VIN (AC) 50mV/div VSW 2V/div VSW 2V/div Time scale 1s/div Time scale 20ms/div Figure 15. Input Voltage Ripple Wave Figure 16. Input Voltage Ripple Wave VIN = 5.0V, VO = 1.8V, IO=0A (c) 2017 ROHM Co., Ltd. VIN = 5.0V, VO = 1.8V, IO=1A 8/9 No. 60UG002E Rev.001 APR.2017 BD9A101MUV-EVK-001 User's Guide VO (AC) 20mV/div VO (AC) 20mV/div VSW 2V/div VSW 2V/div Time scale 2ms/div Time scale 1s/div Figure 17. Output Voltage Ripple Wave Figure 18. Output Voltage Ripple Wave VIN = 5.0V, VO = 1.8V, IO=0A VIN = 5.0V, VO = 1.8V, IO=1A VIN 5V/div EN 5V/div VO 1V/div VSW 5V/div Time scale 1ms/div Time scale 1ms/div Figure 19. Start-up by EN Figure 20. Power-down by EN VIN = 5.0V, VO = 1.8V (c) 2017 ROHM Co., Ltd. VIN = 5.0V, VO = 1.8V 9/9 No. 60UG002E 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. 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