BD9A101MUV-EVK-001 ROHM

2017 ROHM Co., Ltd. No. 60AP001E Rev.001 2017.4 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 ROHMs 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 low- side 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) Limit Parameter Symbol Unit Conditions MIN TYP MAX Supply Voltage VCC 2.7 - 5.5 V VOUT - 1.8 - V Output Voltage / Current I - - 1 A OUT Evaluation Board EN Vout GND BD9673EFJ Eval Board Figure 1. BD9A101MUV-EVK-001 Evaluation Board 2017 ROHM Co., Ltd. No. 60UG002E Rev.001 1/9 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 loads 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 wires resistance. + + DC Voltmeter 2 V DC Voltmeter 1 V + + 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. 2017 ROHM Co., Ltd. No. 60UG002E Rev.001 2/9 APR.2017