BD9673EFJ_EVK ROHM

ROHM Switching Regulator Solutions Evaluation Board: Step-down Switching Regulator With Built-in Power MOSFET No.0000000013 BD9673EFJ / BD9876EFJ (5V 1.5A / 3.0A Output) Introduction This application not ewill provide the steps necessary to operate and evaluate ROsHtepMs-d own switching regulator using the BD9673EFJ/BD9876EFJ evaluation boards. Component selection, board layout recommendations, operation procedures and application data is provided. Description This evaluation board has been developed for ROHsMteps- down switching regulator customers evaluating BD9673EFJ and/or BD9876EFJ. While accepting a wide power supply of 7-42V, a step down output of 1.2V/1.8V/3.3V/5V or any other user defined voltage can be produced. The ICs have an internal 200mohm Nch MOSFET (3.5A max) and a synchronization frequency range of 200 kHz to 500 kHz. A Soft Start circuit prevents in-rush current during startup along with UVLO (low voltage error prevention circuit) and TSD (thermal shutdown detection) protection circuits. An EN pin allows for simple ON/OFF control of the IC to reduce standby current consumption. Applications For general devices that have 12V/24V lines Evaluation Board Operating Limits and Absolute Maximum Ratings Limit Parameter Symbol Unit Conditions MIN TYP MAX Supply Voltage BD9673EFJ VCC 7 - 45 V BD9876EFJ VCC 7 - 45 V Output Voltage / Current *Restricted by minimum on pulse BD9673EFJ VOUT 1* - VCCx0.7 V typ. 200ns *Restricted by minimum on pulse BD9876EFJ VOUT 1* - VCCx0.7 V typ. 200ns BD9673EFJ IOUT - - 1.5 A BD9876EFJ IOUT - - 3 A Evaluation Board Below is the evaluation board with the BD9673EFJ. BD9876EFJ eval board uses the same components and board layout Vout GND GND Vcc BD9673EFJ Eval Board BD9876EFJ Eval Board 1 Applic ation Note Evaluation Board Schematic Below is the evaluation board schematic for BD9673EFJ. BD9876EFJ eval board uses the same schematic Evaluation Board I/O Below is the reference application circuit that shows the inputs (Vcc, EN and Sync) and the output (Vout) Evaluation Board Operation Procedures Below is the procedure to operate the evaluation board 1. Connect GND to a GND pin on the evaluation board 2. Connect Vcc to the +24V Vin pin. This will provide Vcc to the Vcc pin of the IC i. Note: EN pin is pulled high as default 3. Now output power can be measured from the +5V Vout pin on the evaluation board with a load attached Page 2 of 10