FDMF8705 Driver plus FET Multi-chip Module

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FDMF8705 Driver plus FET Multi-chip Module

April 2007

FDMF8705 Driver plus FET Multi-chip Module
Benefits
Fully optimized system efficiency. Higher efficiency levels are achievable compared with conventional discrete components. Space savings of up to 50% PCB versus discrete solutions. Higher frequency of operation. Simpler system design and board layout. Reduced time in component selection and optimization.

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General Description
The FDMF8705 is a fully optimized integrated 12V Driver plus MOSFET power stage solution for high current synchronous buck DC-DC applications. The device integrates a driver IC and two Power MOSFETs into a space saving, 8mm x 8mm, 56-pin Power88TM package. Fairchild Semiconductor s integrated approach optimizes the complete switching power stage with regards to driver to FET dynamic performance, system inductance and overall solution ON resistance. Package parasitics and problematical layouts associated with conventional discrete solutions are greatly reduced. This integrated approach results in significant board space saving, therefore maximizing footprint power density. This solution is based on the IntelTM DrMOS specification.

Features
12V typical Input Voltage Output current up to 18A 500KHz switching frequency capable Internal adaptive gate drive Integrated bootstrap diode Peak Efficiency 85% Under-voltage Lockout Output disable for lost phase shutdown Low profile SMD package RoHS Compliant

Applications
Desktop and server non V-core buck converters. CPU/GPU power train in game consoles and high end desktop systems. High-current DC-DC Point of Load (POL) converters Networking and telecom microprocessor voltage regulators Small form factor voltage regulator modules

Powertrain Application Circuit
12V CVCC

VCIN DISB PWM Input DISB

VIN BOOT CBOOT

PWM CGND

VSWH PGND COUT

OUTPUT

Figure 1. Powertrain Application Circuit

Ordering Information
Current Rating Max [A] 18 Input Voltage Typical [V] 12 1 Frequency Max [KHz] 500 Device Marking FDMF8705
www.fairchildsemi.com

Part FDMF8705
2007 Fairchild Semiconductor Corporation

FDMF8705 Rev. C

FDMF8705 Datasheet Fairchild Download PDF

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FDMF8705 DATASHEET