BD9A300MUV-EVK-001 ROHM

Switching Regulator Series Step-Down DC/DC Converter BD9A300MUV Evaluation Board BD9A300MUV-EVK-001 Description BD9A300MUV-EVK-001 Evaluation board delivers an output 1.8 volts from an input 2.7 to 5.5 volts using BD9A300MUV, 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 loop-response 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.) V = 5.0V, V = 1.8V, Unless otherwise specified. IN OUT Parameter Min Typ Max Units Conditions Input Voltage Range 2.7 5.5 V Output Voltage 1.8 V R1=30k, R2=24k Output Voltage Setting Range 0.8 V0.7 V IN Output Current Range 0 3.0 A Loop Band Width 89.1 kHz Phase Margin 54.1 degrees Input Ripple Voltage 140 mVpp I = 3.0A O Output Ripple Voltage 40 mVpp I = 3.0A O Output Rising Time 5 ms Operating Frequency 1.0 MHz Maximum Efficiency 91.8 % I = 0.7A O www .rohm.co.jp 28.Nov.2014 Rev.002 2014 ROHM Co., Ltd. All rights reserved. 1/10 BDD9A300MUUV-EVK-0001 Opperation Proocedures 1. NNecessary equipments (1) DC power-supply of 2.77V to 5.5V/3A (2) Maximumm 3A load (3) DC voltmeeter 2. CConnecting thhe equipmentss (1) DC power-supply preseets to 5.0V and then the powwer output turns off. (2) The max. load should bbe set at 3A annd over it will bbe disabled. (3) Check Jumper pin of SW1 is short, bbetween intermmediate-terminnal and OFF-sside terminal. (4) Connect ppositive-terminnal of power-ssupply to VIN++terminal and negative-termminal to GND-teerminal with aa pair of wires.. (5) Connect lloads positivee-terminal to VVOUT+terminaal and negativee-terminal to GGND-terminal with a pair of wires. (6) Connect ppositive-terminnal of DC voltmmeter 1 to TP1 and negative-terminal to TTP2 for input-vvoltage measuurement. (7) Connect ppositive-terminnal of DC voltmmeter 2 to TP33 and negative-terminal to TTP4 for outputt-voltage measurement. (8) DC power-supply outpuut is turned ONN. (9) IC is enabble (EN) by shhorting Jumper-pin of SW1 bbetween intermmediate-terminal and ON-siide terminal. (10) Check DDC voltmeter 22 displays 1.8VV. (11) The loadd is enabled. (12) Check aat DC voltmeteer 1 whether thhe voltage-droop (loss) is nott caused by thhe wires resisttance. + V DC Voltmeteer 2 + V DC Voltmeter 1 - - + + DC Poweer Load - - Figure 11. Connection Diagram Ennable-Pin To minimize current consuumption duringg standby-modde and normaal operation, EEnable-mode can be switchhed by controllling EN pin(15pinn) of the IC. Standby-modde is enabledd by shorting Jumper-pin oof SW1 betweeen intermediate-terminal and OFF-side terminal and norrmal-mode opeeration by shoorting betweenn intermediate-terminal and ON-side termminal. It also can bbe swithed beetween standbby-mode and normal-modee operation by removing JJumper-pin annd controlling the voltage betwween EN and GGND-terminal.. Standby-modde is enabled when the voltage of EN is under 0.5V, aand normal-mode operation whhen it is over 22.0V. wwww.rohm.co.jp 28.Novv.2014 Rev.0002 22014 ROHM Coo., Ltd. All rights reserved. 2/10