BD9329AEFJ-E2

Overview

The BD9329AEFJ-E2 is a synchronous step-down switching regulator from ROHM Semiconductor, integrating two low-resistance N-channel MOSFETs into a single chip. It delivers a continuous output current of 3A over a wide input supply range of 4.2V to 18.0V. The device operates at a fixed frequency of 380 kHz and features a feedback voltage accuracy of ±1.5% at room temperature. It utilizes current mode control for fast transient response and easy phase compensation. The component is housed in an HTSOP-J-8 package with an exposed thermal pad and supports operation temperatures from -40°C to +85°C.

Feature Summary

• Integrates high-side and low-side power MOSFETs with low on-resistance for efficient power conversion.
• Employs current mode control architecture to ensure rapid transient response and simplified external compensation.
• Includes comprehensive protection mechanisms such as under-voltage lockout, thermal shutdown, and over-current protection.

Applications

• Distributed power systems
• Pre-regulator stages for linear regulators

Procurement Notes

Verify the NRND (Not Recommended for New Designs) status before initiating any new product development projects. Confirm that existing inventory levels meet long-term supply requirements, as this component may be phased out. Ensure that the HTSOP-J-8 package footprint and thermal pad specifications align with your PCB design constraints. Cross-reference the specific suffix E2 with official datasheets to confirm pinout and electrical characteristics match your system needs.

Selection Notes

Select this component when a compact, single-chip solution is required for 3A buck applications within a 4.2V to 18V input window. The fixed 380 kHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the exposed thermal pad requirement for adequate heat dissipation in high-load scenarios. Evaluate the trade-off between the integrated MOSFET resistance and the need for external gate drive complexity.

Part Context

This part belongs to the BD9329AEFJ series of simple step-down switching regulators. It is categorized under PMIC - Power Management ICs, specifically Switching Voltage Regulators. The device is designed for industrial and general electronic applications requiring efficient DC/DC conversion with minimal external component count.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult ROHM Semiconductor directly for current lifecycle updates or recommended alternative devices within the same product family.