Fairchild FDMF6705B User Guide

6705B - E xtra-S all, H ig -P erfo rm an ce, H ig -F req en cy D r M le

March 2012

FDMF6705B - Extra-Small, High-Performance, High- Frequency Dr MOS Module

Benefits Description The XS™ Dr MOS family is Fairchild’s next-generation,

 Ultra-Compact 6x6mm PQFN, 72% Space-Saving

fully optimized, ultra-compact, integrated MOSFET plus

Compared to Conventional Discrete Solutions

driver power stage solution for high-current, high-

 Fully Optimized System Efficiency frequency, synchronous buck DC-DC applications. The

FDMF6705B integrates a driver IC, two power MOSFETs,

 Clean Switching Waveforms with Minimal Ringing

and a bootstrap Schottky diode into a thermally

 High-Current Handling enhanced, ultra-compact 6x6mm PQFN package.

Features With an integrated approach, the complete switching power stage is optimized with regards to driver and  Over 93% Peak-Efficiency MOSFET dynamic performance, system inductance, and power MOSFET RDS(ON). XS™ Dr MOS uses

 High-Current Handling of 40A at 12VIN

Fairchild's high-performance Power Trench® MOSFET

 High-Current Handling of 38A at 19VIN technology, which dramatically reduces switch ringing,

eliminating the need for a snubber circuit in most buck

 High-Performance PQFN Copper-Clip Package

converter applications.

 3-State 3.3V PWM Input Driver

A new driver IC with reduced dead times and

 Skip-Mode SMOD# (Low-Side Gate Turn-Off) Input

propagation delays further enhances the performance of  Thermal Warning Flag for Over-Temperature this part. A thermal warning function warns of a potential Condition over-temperature situation. The FDMF6705B also incorporates features, such as Skip Mode (SMOD), for

 Driver Output Disable Function (DISB# Pin)

improved light-load efficiency, along with a three-state

 Internal Pull-Up and Pull-Down for SMOD# and 3.3V PWM input for compatibility with a wide range of DISB# Inputs, Respectively PWM controllers.  Fairchild Power Trench® Technology MOSFETs for

Applications

Clean Voltage Waveforms and Reduced Ringing

 Fairchild Sync FET™ (Integrated Schottky Diode)  High-Performance Gaming Motherboards

Technology in the Low-Side MOSFET

 Notebook Computers, V-Core and Non-V-Core

 Integrated Bootstrap Schottky Diode

 Compact Blade Servers, V-Core and Non-V-Core

 Adaptive Gate Drive Timing for Shoot-Through DC-DC Converters Protection

 Desktop Computers, V-Core and Non-V-Core

 Under-Voltage Lockout (UVLO)

DC-DC Converters

 Optimized for Switching Frequencies up to 1MHz

 Workstations

 Low-Profile SMD Package

 High-Current DC-DC Point-of-Load (POL)

 Fairchild Green Packaging and Ro HS Compliance Converters  Based on the Intel® 4.0 Dr MOS Standard  Small Form-Factor Voltage Regulator Modules

Ordering Information

Part Number Current Rating Package Top Mark

FDMF6705B 40A 40-Lead, Clipbond PQFN Dr MOS, 6.0x6.0mm Package FDMF6705B

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com FDMF6705B • Rev. 1.0.2