BD7F105EFJ-CE2

Overview

The BD7F105EFJ-CE2 is an isolated flyback DC-DC converter IC with an integrated automotive-grade switch MOSFET, designed for gate drive power supplies in xEV applications. It eliminates the need for a photocoupler and transformer auxiliary windings by utilizing adaptive on-time control technology for stable switching frequency characteristics and fast load response. The device operates within a 3.4 V to 42 V input range, delivering up to 4 W output power at 12 V input with a typical switch current limit of 2.6 A. It features a maximum switching frequency of 363 kHz and supports light load PFM operation. Qualified under AEC-Q100 Grade 1, it includes thermal shutdown, UVLO, and soft start functions.

Feature Summary

• Integrated controller type with built-in switch MOSFET eliminating external discrete components
• Photocoupler-free feedback mechanism reducing component count and noise design workload
• Adaptive on-time control technology enabling high-speed load response without auxiliary windings
• Comprehensive protection suite including thermal shutdown, under voltage lock out, and current limiting

Applications

• Gate drive power supplies for electric vehicle compressors
• Power supplies for PTC heaters in xEV systems
• Isolated power generation for automotive control units requiring compact form factors

Procurement Notes

Verify the specific suffix CE2 against the manufacturer's latest Product Change Notice (PCN) documentation to ensure alignment with updated specifications. Confirm that the HTSOP-J8 package dimensions match the target PCB layout requirements. Ensure that the AEC-Q100 Grade 1 qualification status meets the functional safety support category requirements for the intended automotive application environment.

Selection Notes

Select this component when designing isolated flyback converters that require reduced bill of materials through the elimination of optocouplers. It is suitable for applications demanding fast transient response and high efficiency at light loads via PFM operation. Consider the 4.9x6.0 mm package size constraints and the 3.4 V minimum input voltage requirement during system architecture planning.

Part Context

This IC belongs to ROHM’s series of isolated flyback converters optimized for automotive gate drive applications. It shares architectural similarities with models like the BD7F205EFJ-C but offers specific electrical characteristics tailored for compact power supply designs. The product line emphasizes functional safety support and reliability in harsh automotive environments, adhering to strict automotive qualification standards.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate cross-referencing with other ROHM isolated flyback controllers if pin compatibility and electrical parameters align, ensuring verification of functional safety classification and package dimensions before substitution.

FAQ

How does the BD7F105EFJ-CE2 achieve isolation feedback without a photocoupler?

It utilizes an adaptive on-time control technology that regulates the output voltage based on the primary side switching characteristics, removing the need for a photocoupler or transformer auxiliary winding.

What is the maximum switching frequency of this converter?

The maximum switching frequency is 363 kHz, allowing for the use of smaller passive components in the design.

Does the device support low-power operation modes?

Yes, it includes a light load mode that operates in Pulse Frequency Modulation (PFM) to maintain high efficiency at lower load currents.