BD9876EFJ-E2

Overview

The BD9876EFJ-E2 is a flexible step-down switching regulator with an integrated power MOSFET. It delivers up to 3A output current and operates at a fixed oscillation frequency of 300kHz, enabling external component downsizing. The device features an internal Nch-FET switch rated for 45V withstand voltage and utilizes current mode control for high-speed load response. It includes an EN pin for ON/OFF control with typical standby current of 0µA. The IC is housed in a thermally enhanced HTSOP-J8 package.

Feature Summary

• Integrates a 45V rated Nch-FET switch for compact power supply design
• Utilizes current mode control for simple phase compensation and fast load response
• Supports synchronization to an external clock signal within the 200kHz to 500kHz range
• Includes built-in protection circuits for overcurrent, thermal shutdown, and low input error prevention

Applications

• Secondary side power supply for household appliances
• Step-down conversion from 12V or 24V fixed lines
• Generation of standard logic voltages such as 1.2V, 1.8V, 3.3V, and 5V

Procurement Notes

Verify the specific suffix E2 against the official ROHM datasheet to confirm compliance with RoHS directives and halogen-free status. Confirm that the HTSOP-J8 package dimensions match the target PCB footprint. Ensure the 300kHz operating frequency aligns with electromagnetic interference requirements for the intended application environment.

Selection Notes

Select this component when a single-chip solution is required for currents up to 3A with a 45V input tolerance. The integrated FET reduces bill of materials compared to controller-based designs. Consider the 300kHz base frequency for balancing efficiency and passive component size. Verify that the external clock synchronization range meets system timing constraints if jitter reduction is necessary.

Part Context

This part belongs to ROHM's series of flexible step-down switching regulators featuring built-in power MOSFETs. These devices are designed to simplify power supply circuitry by integrating the switching element, thereby reducing the number of external components required. The family targets applications requiring reliable DC-DC conversion in space-constrained environments.

Replacement Considerations

Publicly confirmed substitute part numbers for the BD9876EFJ-E2 were not found in the provided documentation. Cross-referencing with other ROHM models in the same package and electrical class is recommended.