BD9G401EFJ-M1ch Buck Converter Integrated FET
1ch Buck Converter Integrated FET
BD9G401EFJ is a buck converter with built-in high side MOSFET. It has an input voltage range of 4.5V to 42V. Current mode architecture provides fast transient response and a simple phase compensation setup. The IC is mainly used as a secondary side power supply: for example, a step-down output of 3.3V/5V can be produced from voltage power supply such as 12V or 24V. In addition, it has a synchronization function with an external CLK that provides noise management.
We recommend BD9G401UEFJ-M for your new development. It uses different production lines for the purpose of improving production efficiency. Electric characteristics noted in Datasheet does not differ between Production Line.
Integrated FET / Controller
Synchronous / Nonsynchronous
Light Load mode
Operating Temperature (Min.)[°C]
Operating Temperature (Max.)[°C]
Package Size [mm]
AEC-Q100 (Automotive Grade)
- AEC-Q100 Qualified
- Integrated Nch MOSFET
- Synchronizes to external clock 200kHz to 500kHz
- ON/OFF Control through EN Pin (Standby current of 0µA)
- Small package (HTSOP-J8ES)
- LowDrop Out operation
- Evaluation Board
This EVK has been developed for ROHM’s non-synchronous buck DC/DC converter customers evaluating BD9G401EFJ-M. While the BD9G401EFJ-M accepts a power supply input range of 4.5V to 42V, and generates output voltages from 1V to VCC, this EVK is setup for the input voltage range of 10V to 42V and a fixed output of 5V can be produced.