BD9G401EFJ-E2

Overview

The BD9G401EFJ-E2 is a single-channel non-synchronous buck converter from ROHM Semiconductor, housed in an HTSOP-J8 package. It accepts an input voltage range of 4.5 V to 42 V and provides an adjustable output voltage between 800 mV and 42 V. The device delivers a maximum output current of 3.5 A with a switchable frequency of 250 kHz to 500 kHz. Operating temperatures span from -40°C to +105°C, and the quiescent current is 1.2 mA.

Feature Summary

• Integrates a high-side Nch MOSFET for compact design
• Supports synchronization with an external clock signal
• Enables zero standby current via EN terminal shutdown

Applications

• Secondary side power supplies for industrial systems
• Step-down conversion from 12V or 24V sources
• Noise-sensitive applications requiring clock synchronization

Procurement Notes

Verify the specific suffix against official ROHM documentation to confirm exact electrical characteristics and packaging options. Ensure compatibility with required thermal management solutions given the operating temperature range. Confirm RoHS compliance status through the manufacturer's latest datasheet before finalizing procurement specifications.

Selection Notes

Select this component when a wide input voltage range up to 42 V is required alongside moderate current delivery. The non-synchronous topology suits cost-sensitive designs where external rectification is unnecessary. Evaluate the need for external clock synchronization if noise immunity is critical for the target application environment.

Part Context

This part belongs to the BD9G series of integrated FET DC-DC converters designed for robust performance in industrial environments. It utilizes current mode architecture to ensure fast transient response and simplified phase compensation. The series targets applications demanding reliable step-down regulation with minimal external component count.

Replacement Considerations

BD9G401EFJ-ME2 is a confirmed substitute within the same family.