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FDMF8705

FDMF8705 Description

The FDMF8705 from Fairchild Semiconductor (now onsemi) is a high-performance Half-Bridge DrMOS (Driver + MOSFET) IC designed for synchronous buck converters. This integrated solution combines a PWM interface, bootstrap circuit, and high-efficiency power stages in a compact Power88-56 package. Optimized for inductive load applications, it supports a load voltage range of 6.4V to 14V and a supply voltage range of 6.4V to 13.5V, delivering peak output currents up to 65A and a continuous output current of 18A per channel. Its half-bridge output configuration makes it ideal for high-current DC-DC conversion in space-constrained designs.

FDMF8705 Features

• Integrated DrMOS Technology: Combines driver and MOSFETs for reduced parasitics and improved thermal performance.
• High Current Capability: 65A peak output and 18A continuous current per channel for demanding power applications.
• Wide Voltage Range: Supports 6.4V–14V load and 6.4V–13.5V supply, suitable for multi-rail systems.
• Bootstrap Circuit: Enhances high-side driving efficiency, reducing external component count.
• Surface-Mount Design: Power88-56 package ensures compact PCB footprint and improved thermal dissipation.
• PWM Interface: Simplifies control integration in synchronous buck topologies.
• RoHS3 Compliant: Meets environmental and regulatory standards.

FDMF8705 Applications

The FDMF8705 excels in high-efficiency power conversion systems, including:

• Server/Data Center PSUs: High-current VRMs (Voltage Regulator Modules) for CPUs/GPUs.
• Telecom Infrastructure: Intermediate bus converters and POL (Point-of-Load) regulators.
• Industrial Power Systems: Motor drives and automated equipment requiring robust half-bridge drivers.
• Automotive Electronics: Auxiliary power modules (within specified voltage ranges).

Conclusion of FDMF8705

The FDMF8705 stands out as a high-density, high-efficiency DrMOS solution for synchronous buck converters, offering superior current handling, thermal performance, and integration compared to discrete driver-MOSFET alternatives. While now obsolete, its design principles remain relevant for legacy systems or replacements in high-reliability applications. Engineers seeking similar modern alternatives should consider onsemi's updated DrMOS portfolio for comparable performance with enhanced features.