FDMF8704

Full Half-Bridge (H Bridge) Drivers Overview

The FDMF8704 is a synchronous buck converter DrMOS device manufactured by Fairchild Semiconductor, now part of onsemi. It integrates a high-side and low-side gate driver with power MOSFETs in a single multi-chip module package. The component supports an input voltage range from 4.5 V to 5.5 V and delivers a maximum output current of 32 A per channel. It features a propagation delay of up to 22 ns and operates within a temperature range of -55°C to +150°C. The device utilizes a PQFN-56 (Power88) surface-mount package.

Full Half-Bridge (H Bridge) Drivers Feature Summary

• Integrates dual-channel gate drivers with high-side and low-side power MOSFETs for synchronous rectification
• Includes built-in bootstrap circuitry and protection against over-current and under-voltage lockout
• Designed for high-frequency operation with fast switching characteristics

Full Half-Bridge (H Bridge) Drivers Applications

• Synchronous step-down DC/DC converters
• Point-of-load voltage regulation modules
• Server and workstation power distribution networks

Full Half-Bridge (H Bridge) Drivers Procurement Notes

Verify the specific manufacturer designation, as Fairchild Semiconductor operations were acquired by onsemi. Confirm the exact ordering suffix and package variant to ensure compatibility with design specifications. Check current availability status as supply conditions may vary between original Fairchild stock and onsemi production lines. Validate RoHS compliance documentation for the specific batch.

Full Half-Bridge (H Bridge) Drivers Selection Notes

Select this component for applications requiring integrated high-current synchronous rectification in a compact form factor. Ensure the control loop supports the required switching frequency and that the PCB layout accommodates the thermal requirements of the Power88 package. Verify that the input voltage rail remains stable within the 4.5 V to 5.5 V operating window.

Full Half-Bridge (H Bridge) Drivers Part Context

The FDMF8704 belongs to the DrMOS family, which combines discrete driver and MOSFET technologies into a single optimized module. This integration reduces board space and simplifies design compared to using separate components. The device represents a transition period product where Fairchild branding was used prior to full integration into the onsemi portfolio.

Full Half-Bridge (H Bridge) Drivers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.